Systems and methods to form biological biorresiduous from raw biorresidual (Machine-translation by G

专利摘要:
Systems and methods for forming cellulosic biorresidue from crude bioresidue. The present invention relates generally to systems and methods for fractionating crude bioresidues by at least one size separation step and at least one density separation step, x-ray separation and optical classification to form a stream of clean biowaste. Enriched in cellulosic material, a waste stream comprising inorganic compounds, and a stream of plastic material. (Machine-translation by Google Translate, not legally binding)
公开号:ES2565553A1
申请号:ES201431440
申请日:2014-09-30
公开日:2016-04-05
发明作者:Ana Isabel VICENTE GARCÍA；Cristina MONTEJO MÉNDEZ；Ignacio CARVAJO LUCENA；Santiago MARTI MOSCAD
申请人:Abengoa Bioenergia Nuevas Technologias SA；
IPC主号:

专利说明:

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DESCRIPTION
Systems and methods for forming cellulosic bio-residue from crude bio-residue
Background
The field of the invention relates generally to methods for the fractionation of solid waste and for the production of useful products and the recovery of recyclable materials from the different fractions. More particularly, the methods of the present invention relate to the fractionation of urban solid waste to provide a clean bio-waste stream suitable for conversion into monosaccharides and to provide recyclable streams that include high density polyethylene plastic and polyethylene terephthalate plastic.
Commercial, industrial and residential consumers generate large amounts of solid waste (eg urban solid waste ("MSW") that must be handled and disposed of in an environmentally responsible manner. Traditionally, MSWs have been disposed of by landfill disposal or incineration However, these methods to dispose of the residual product contaminate the soil, water and air and require the use of land that could be used for other purposes.
MSW typically comprise significant amounts of recyclable material including components such as organic cellulosic bio-wastes (such as food waste, garden waste, wood, paper and cardboard), plastic, glass, ferrous materials, and non-ferrous materials (such as aluminum). The RSU classification operations to recover the different components are known in the art but such known methods are typically ineffective. The prior art bio-waste fractions are typically impure and contaminated with different components, such as enzymatic hydrolysis and fermentation inhibitors, which normally make these cellulosic bio-waste fractions unsuitable for conversion into monosaccharides and optional fermentation products. at an acceptable rate and commercial performance. For this reason, the MSW fractionation methods of the prior art generally recover the value of organic bio-waste by incineration (energy recovery), gasification (by pyrolysis) or composting.
Therefore, there is a need for systems and methods to form cellulosic bio-wastes
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from a mixture of solid residues, said cellulosic bio-wastes of sufficient purity to allow commercially acceptable rates of conversion into monosaccharides by enzymatic hydrolysis.
Short description
In one aspect of the invention, a method is provided for preparing a clean bio-waste stream from a raw bio-waste stream and a mixture of plastics. The method comprises: (a) classifying the raw bio-waste stream in a first sorting stage to form (1) a first through rejection stream that has an average particle size of less than 6 mm to 15 mm and that is enriched in inorganic compounds in comparison to the raw bio-waste stream and (2) a first sinking (rejection) stream enriched in bio-waste compared to the raw bio-waste stream, in which the through stream comprises at least 50 percent in weight of inorganic compounds; (b) classifying the first sinking current in a second classification stage to form a second rejection current and an intermediate bio-waste current in which the second rejection current has a higher density in grams per cm3 compared to the bio-waste current intermediate and the second rejection stream is enriched in inorganic compounds compared to the intermediate bio-waste stream; (c) classifying the crude bio-waste stream in a third classification stage to form a second sinking current and a second through current, in which the second sinking current is enriched in plastic compared to the intermediate bio-waste current and in which the second through current has an average particle size of less than 50 mm to 70 mm and is enriched in bio-waste compared to the intermediate bio-waste stream; (d) classifying the second sinking stream into a fourth sorting stage to form a stream of plastic material enriched in recyclable plastic components compared to the second sinking stream and a stream of thick bio-waste enriched in bio-waste compared to the second sinking current; and (e) combining the thick bio-waste stream with the second through current to form the clean bio-waste stream.
In another aspect of the invention, a method is provided for preparing a clean bio-waste stream from a raw bio-waste stream and a mixture of plastics. The method comprises: (a) classifying the crude bio-waste stream in a first sorting stage to form (1) a first through-stream which has an average particle size of less than about 25 mm to 50 mm and which is
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enriched in inorganic compounds compared to the raw bio-waste stream and (2) a first sinking stream enriched in bio-waste compared to the raw bio-waste stream; (b) classify the first through current in a second classification stage to form (1) a first through rejection current that has an average particle size of less than 6 mm to 15 mm and that is enriched in inorganic compounds compared to the first through current and (2) a second sinking stream enriched in bio-waste compared to the raw bio-waste stream, in which the first through rejection current comprises at least 50 percent by weight of inorganic compounds; (c) classifying the first sinking current in a third classification stage to form (1) a first stream of plastic material enriched in plastic material compared to the combination of the first sinking current and the second sinking current, in the that the objects of the first stream of plastic material have an average particle size of 25 mm to 80 mm, (2) a rejection stream enriched in inorganic compounds as compared to the combination of the first sinking stream and the second stream of sunk, and (3) a first stream of clean bio-waste enriched in bio-waste compared to the combination of the first sink current and the second sink current, in which the objects contained therein have an average particle size smaller than 50 mm; (d) classifying the first stream of plastic material in a fourth classification stage to form a second stream of plastic material enriched in recyclable plastic components compared to the first stream of plastic material and a second stream of clean bio-waste enriched in bio-waste in comparison with the first stream of plastic material; and (e) combining the first clean bio-waste stream and the second clean bio-waste stream to form the clean bio-waste stream.
In another aspect of the invention, an apparatus is provided for preparing a clean bio-waste stream from a raw bio-waste stream comprising cellulose, inorganic compounds, and a mixture of plastics. The apparatus comprises: (a) a first screening screen having openings of 6 mm to 15 mm to receive and classify the raw bio-waste stream to form (1) a first through rejection stream enriched in inorganic compounds as compared to the raw bio-waste stream and (2) a first sink stream enriched in bio-waste compared to the raw bio-waste stream, in which the through stream comprises at least 50 percent by weight of inorganic compounds; (b) a density separator to receive and classify the first sink current to form a second rejection current and an intermediate bio-waste stream in which the
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second rejection stream has a higher density in grams per cm3 compared to the intermediate bio-waste stream and the second rejection stream is enriched in inorganic compounds compared to the intermediate bio-waste stream; (c) a second sorting screen having an opening size of about 50 mm to about 70 mm to receive and classify the intermediate bio-waste stream to form a second sinking stream and a second through stream, in which the second stream sinking is enriched in plastic compared to the intermediate bio-waste stream and the second through current is enriched in bio-waste compared to the intermediate bio-waste stream; (d) an optical classifier to receive and classify the second sinking current to form a first optical classification current enriched in recyclable plastic components compared to the second sinking current and a second optical classification current enriched in bio-waste compared to the second sinking current; and (e) in which the second optical classification current and the second through current combine to form the clean bio-waste stream.
In another aspect of the invention, an apparatus is provided for preparing a clean bio-waste stream from a raw bio-waste stream comprising cellulose, inorganic compounds, and a mixture of plastics. The apparatus comprises: (a) a first sorting screen having openings of about 25 mm to about 50 mm to receive and classify the raw bio-waste stream to form (1) a first through current enriched in inorganic compounds as compared to the raw bio-waste stream and (2) a first sinking stream enriched in bio-waste compounds compared to the raw bio-waste stream; (b) a second screening screen having openings of 6 mm to 15 mm to receive and classify the first through current to form (1) a second through rejection current enriched in inorganic compounds compared to the first through current and (2 ) a second sinking stream enriched in bio-wastes compared to the first through stream, wherein the second through stream comprises at least 50 percent by weight of inorganic compounds; (c) an X-ray separator to receive and classify the first sinking current to form (1) a first X-ray separation current enriched in plastic material compared to the combination of the first sinking current and the second current of sunk, in which the objects of the X-ray separation stream have an average particle size of 25 mm to 80 mm, (2) a second X-ray separation stream enriched in inorganic compounds compared to the combination of the first sinking current and the second sinking current, and (3) a current of
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Clean bio-waste comprising at least one X-ray separation stream enriched in bio-waste compared to the combination of the first sinking current and a second sinking current, in which the objects contained therein have a smaller average particle size 50 mm; and (d) an optical classifier to receive and classify the first X-ray separation current to form a first optical classification current enriched in recyclable plastic components compared to the second sinking current and a second optical classification current enriched in bio-waste compared to the second sinking current. The at least one X-ray separation stream enriched in bio-waste and the second optical classification stream enriched in bio-waste are combined to form the clean bio-waste stream.
Brief description of the drawings
Figure 1 is a process flow diagram of a first aspect of the present invention.
Figure 2 is a process flow diagram of a second aspect of the present invention.
Figure 3 is a process flow diagram of a third aspect of the present invention.
Figure 4 is a process flow diagram of a fourth aspect of the present invention.
Figure 5 is a process flow diagram of a fifth aspect of the present invention.
Figure 6 is a process flow diagram of a sixth aspect of the present invention.
Figure 7 is a process flow diagram of a seventh aspect of the present invention.
Detailed description
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In the present invention there is provided an integrated method for classifying solid waste comprising combinations of fractionation techniques that include, but are not limited to, manual separation, separation according to the size of the material, separation according to the density of the material, separation according to the dimension of the material , separation according to the optical properties of the material, and separation according to X-ray absorption properties of the material. The procedure provides for the efficient generation of several high-value recovered streams for recycling and conversion into higher value products including (1) clean bio-wastes that are suitable for glucose production, (2) recycled streams for recycling that include the classification of plastics, paper, cardboard, beverage cartons, glass and / or metals, (3) fuel derived from waste, (4) optional preparation of fermentation products from glucose, and (5) optional preparation of synthesis gas from of one or more currents rich in isolated organic compounds.
More particularly, the apparatus, methods and methods of the present invention provide an effective classification of MSW to provide a clean stream of high purity bio-waste comprising cellulose and low concentrations of enzymatic and fermentation inhibitors, such as clay and inorganic salts, which It is suitable for conversion into monosaccharides and optional fermentation products at an acceptable commercial rate and yield. The present invention also provides streams of recyclable plastics that are classified according to the type of plastic, such as polyethylene terephthalate ("PET"), high density polyethylene ("HDPE") and poly (vinyl chloride) ("PVC"). The present invention also additionally provides a solid residual fuel ("CSR") having a caloric value of at least 17 megajoules per kilogram that is suitable for use as a source of energy in steam generation boilers and cement production furnaces. The present invention further provides the recovery of paper and cardboard suitable for sale as waste materials. The present invention also provides several streams enriched in organic substances suitable for conversion into secondary products by gasification.
As used herein, "solid waste mixture" refers to a stream of waste comprising bio-waste (for example, food waste and garden waste), inorganic substances (e.g., dirt, rocks and debris), plastics mixed (for example, at least PET and HDPE), metals (for example, iron, steel, aluminum, brass and / or copper), fiber (for example, paper and cardboard ("PyC")), glass, textiles, rubber and wood. An example of solid waste mix is the MSW.
As used herein, RSU refers to the solid waste mix stream that predominantly comprises a mix of urban and commercial waste. Although the precise composition of the MSW varies with the source, and the concentrations and ranges disclosed in this paragraph should not be taken as a limitation, the MSW 5 typically includes, without limitation, the components detailed in Table A below (wet base ):
Table A
 Component  Interval 1 Interval 2 Interval 3
 Organic fraction  30% to 80% 35% to 75% 40% to 70%
 Food waste  5% to 55% 10% to 50% 15% to 45%
 Garden waste  2% to 25% 3% to 20% 5% to 15%
 Metals  0.1% to 10% 0.5% to 5% 1% to 3%
 Plastics  3% to 30% 5% to 25% 10% to 20%
 PET  0.1% to 5% 0.5% to 3% 1% to 2%
 HDPE  0.1% to 5% 0.3% to 3% 0.5% to 1.5%
 Glass  1% to 10% 2% to 8% 3% to 6%
 Rubber, leather, textiles  1% to 20% 3% to 15% 6% to 11%
 Inorganic material  0.1% to 20% 0.5% to 15% 1% to 12%
 Combustible material (for example, wood)  5% to 35% 10% to 30% 15% to 25%
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The mixture of solid waste and MSW can be further characterized as a mixture of (i) two-dimensional components such as paper, cardboard, plastic film and at least a part of the mixture of metal components and (ii) three-dimensional objects such as bottles, cans, beverage cartons, inorganic material, glass, at least a part of the mixture of metal components, and a predominant part of the organic fraction.
As used herein, "bio-waste" refers to a fractional stream enriched in organic material suitable for conversion to monosaccharides such as, for example, glucose and / or xylose. The organic material includes, but is not limited to, starch, cellulose, lignocellulose and hemicellulose. Bio-wastes are characterized by comprising at least 30% by weight, at least 35% by weight, at least 40% by weight, at least 45% by weight, at least 50% by weight, at least 55 % by weight, at least 60% by weight, at least 65% by weight, at least 70% by weight, at least 75% by weight, at least 80% by weight or at least 85% by weight 25 organic material (ie "organic content"), and its ranges, such as from about 50 to about 85% by weight, or from about 60 to about 80% by weight of organic material.
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As used herein, "predominant", "predominantly comprising" and "substantial" are defined as at least 50%, at least 75%, at least 90%, at least 95% or at least 99% as% p / p,% p / vo% v / v.
As used herein, "recyclable material" refers to the components of the waste mix that have value and include, but are not limited to, paper, cardboard, metals, glass, beverage cartons, plastic, and combinations thereof.
As used herein, "enriched" refers to a fractional process stream or a fractionated constituent that has a concentration of a cited component that is greater than the concentration of said component (i) in the process stream or in a constituent from which the fractionated process stream or fractionated constituent is produced or (ii) in one or more streams divided simultaneously or one or more components divided simultaneously.
Various non-limiting aspects of the present invention are plotted in Figures 1 to 7.
Figure 1 graphically depicts a first aspect of the present invention where the solid waste mixture 1 is optionally processed by a manual sorting stage 5 from which a chosen stream is obtained comprising one or more recyclable materials (e.g., paper and cardboard), combustible materials (for example, wood), large or bulky waste and / or hazardous waste 2 and a raw feed stream 3. The raw feed stream 3 is divided into the barrel 10 which has an opening sieve from about 60 mm to about 100 mm to form a through current 12 enriched in fine material compared to the raw feed current 3 and a sinking current 11. The through current 12 is enriched in organic and inorganic material compared to the sinking current 11. The sinking current 11 is divided into a drum 20 having openings of approximately 170 mm to approx. 380 mm to form a through current 21 and a sinking current 25. In some aspects of the present invention, the barrel 20 comprises a two-stage sieve with a first section having openings of about 170 mm to about 230 mm and a second stage that has openings of approximately 320 mm to approximately 380 mm. In some additional aspects of the present invention, the tromel 20 comprises two single-stage trompels arranged in series with a first trommel having openings of approximately 170 mm to approximately 230 mm and a second tromel having openings of approximately
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320 mm to approximately 380 mm. In said arrangement of the two-stage or single-stage thromel, the first and second through currents (collectively represented as 21) and the first and second sinking currents are generated in which the first sinking current is screened to form the second through current and the second sink current is graphically represented as the current 25 in Figure 1. The sink current 25 is optionally processed manually in a sorting stage 200 from which a chosen current comprising recyclable material is obtained as paper, cardboard, beverage cartons, glass and plastics 201 and a waste stream of waste ("CDR") 202 enriched in combustible components. The through current 21 is enriched in rolling material compared to the sinking current 25. When the trommel 20 is a two-stage sequential trommel or trompels, the through current through the openings of approximately 170 mm to approximately 230 mm is enriched in bottles compared to the through current that passes through the openings of about 320 mm to about 380 mm, and the through current that passes through the openings of about 320 mm to about 380 mm is enriched in waste in bags compared to the through current that passes through the openings of approximately 170 mm to approximately 230 mm. In optional aspects of the present invention (not shown graphically in Figure 1), the 320-380 mm through current can be optionally processed in a bag opening apparatus before being processed further. The through-stream or the combined through-streams 21 is fractionated by ballistic separation 100 to form a rolling material stream 101, a stream of thin material 102 and a stream of flat materials 105. Compared to the passing stream 21, the Rolling material stream 101 is enriched in bottles and cans, the stream of fine material 102 is enriched in organic and inorganic compounds, and the stream of flat materials 105 is enriched in paper and cardboard. The stream of fine material 102 is combined with the through stream 12 to form the stream of raw cellulosic bio-wastes 15.
As a further reference to Figure 1, the crude cellulosic bio-waste stream 15 is fractionated into a trommel 30 having openings of about 5 mm to about 20 mm to form a through current 31 and a sink current 35. The through current 31 It predominantly comprises inorganic material and organic material, where the inorganic material is in excess. In some aspects of the present invention, the through current 31 is purged from the process. The sink current 35 is enriched in organic material such as cellulose, hemicellulose and starch, but additionally comprises some amount of inorganic materials and recyclable material
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It includes plastic. The sink current 35 is fractionated by density separation 150 to form a stream of dense material 151 enriched in inorganic compounds as compared to the sink current 35 and a stream of light materials 155 enriched in organic material compared to the sink current 35. The stream of light materials 155 is divided into a barrel 40 having openings of about 20 mm to about 30 mm to form a clean bio-waste stream 45 and a sink current 41. The sink current 41 is fractionated by optical classification 170 to recover the stream rich in organic material 171 and a recycled stream 175 which is enriched in recyclable material comprising plastic. The particle size of the stream rich in organic material 171 is reduced in a mill 180 to form the stream of bio-waste 181 which is combined with the stream of clean bio-waste 45 to form a stream of clean bio-waste 47 for conversion into monosaccharides.
As a further reference to Figure 1, the rolling stock stream from the ballistic separation 101 and the stream rich in recyclable materials 175 are fractionated by optical sorting and manual sorting 110 to form a series of recovered streams 111 including plastic films 112, plastic HDPE 113, PET 114 plastic, mixed plastic 115, beverage cartons 116, paper / cardboard 117 and CDR 120 current. The flow of flat materials by ballistic separation 105 is optionally fractionated by optical classification 210 to form the CDR 215 current and the current of paper and cardboard 211. The CDR streams 120, 202 and 215 combine to form the CDR stream 205 which is processed by conditioning CDR 220 described herein as, for example, the procedure depicted in Figure 4, for Generate a fuel source.
In any of the different aspects of the present invention, the conversion of any of the different streams of clean bio-waste into monosaccharide sugars (such as glucose and xylose), and optionally an additional conversion of the monosaccharides into ethanol, can be carried out by according to a variety of methods. For example, as shown in Figure 1, the clean bio-waste stream 47 can be processed by pretreatment at elevated pressure and temperature, such as by direct contact with steam or by indirect heating 320 to form a bio-waste stream. 321 pretreated in which (1) the lignocellulosic biomass contained therein is degraded to give (i) cellulose and hemicellulose at least partially from lignin thereby increasing the accessibility of cellulose and hemicellulose to enzymatic hydrolysis and ( ii) generate xylose from the
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degradation of hemicellulose, (2) the starch contained in the above is gelatinized and (3) the stream is sterilized. In some aspects of the present invention (not shown graphically in Figure 1), before steam pretreatment 320, the water content of the clean bio-waste stream 47 is adjusted to approximately 10 percent by weight ("% by weight" at about 60% by weight with an aqueous stream, an acidic aqueous stream or a basic aqueous stream.In enzymatic hydrolysis ("HE") 330, the pretreated bio-waste stream 321 is cooled to less than about 60 ° C and set in contact with a source of enzymes 331 comprising cellulase and / or hemicellulase to form the hydrolyzed bio-waste stream 335 comprising non-hydrolyzed cellulase, dextrin and the glucose and xylose monosaccharide sugars, as graphically depicted in Figure 1, the current of hydrolyzed bio-waste 335 is contacted with a source of at least one fermentation organism 341 in the fermentation step 340 to convert glucose into a product of fermentation 345 where the action of the enzyme source generates fermentable monosaccharides. In the fermentation step 340, additional monosaccharides are generated by enzymatic hydrolysis of the cellulose which results in simultaneous saccharification and fermentation ("SFS"). In some optional aspects, additional enzymes 342 may be added during fermentation. In some aspects of the present invention, the fermentation organism is a yeast and the fermentation product is ethanol. The conversion of the clean bio-waste stream 47 into monosaccharides and fermentation products is not limited to the scheme represented graphically in Figure 1. The clean bio-waste stream 47 can be suitably converted, instead, into monosaccharides and fermentation products from according to any method included in the scope of the present invention, such as, for example, the diagrams depicted in any of Figures 2 or 3.
Figure 2 graphically depicts a second aspect of the present invention that generally corresponds to Figure 1 in regards to manual classification 5 (optional), tromel 10, tromel 20, ballistic separation 100 and manual classification 200 fractionation steps and sink current 11, through current 12, fine material stream 102, raw cellulosic bio-waste stream 15, through current 21, sink current 25, rolling stock stream 101, flat material stream 105, and enriched CDR 202 stream in combustible components. In additional relation to Figure 2, the stream of raw cellulosic bio-wastes 15 is divided into a trommel 50 which is a two-stage trommel having a first section with openings of about 20 mm to about 30 mm and a second section having openings of approximately 40 mm to approximately 60 mm to form a first
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through-flow 51 that crosses openings of 20 mm to 30 mm, a second through-flow 55 that crosses through openings of 40 mm to 60 mm and a sink current 56 in which the first through-flow 51 is enriched with inorganic compounds as compared to the second through current 55. In some aspects, the barrel 50 may comprise two single-screen trommels arranged sequentially. The through stream 51 is divided into a barrel 30 having openings of about 5 mm to about 15 mm to form a through stream 31 and a sink current 35. The through stream 31 predominantly comprises inorganic material and organic material, where the inorganic material It is in excess. In some aspects of the present invention, the through current 31 is purged from the process. The sink current 35 is enriched in organic material such as cellulose, hemicellulose and starch. The sinking current 35, the through current 55 and the sinking current 56 are fractionated by X-ray separation 160 to form the bio-waste stream 165 having an average particle size smaller than about 25 mm and the bio-waste streams 161A and 161B, each of them having a particle size greater than about 25 mm, and the current 162 which is enriched in inorganic material compared to any of streams 161A, 161B and 165. As graphically depicted in Figure 6 , X-ray separation 160 may comprise 3 stages of X-ray separation, 160A to process stream 35 to form a stream rich in bio-waste 165 and a stream rich in inorganic material 162, 160B to process stream 55 to form a stream rich in bio-waste 161A and a stream rich in inorganic material 163, and 160C to process stream 56 to form a stream rich in bio-waste 161B and a stream rich in inorganic material 164. The particle size of the bio-waste streams 161A and 161B is reduced in a mill 180 to form the bio-waste stream 181 which is combined with the bio-waste stream 165 to form a clean bio-waste stream 185 for conversion into monosaccharides. Either of the streams 162, 163 or 164 can be purged from the process, optionally, or it can be further fractioned such as by an optical classification stage 110, by density separation (not graphically represented), by a specific optical classification (not represented graphically), or one of its combinations.
As a further reference to Figure 2, the rolling stock stream from the ballistic separation 101 is fractionated by optical sorting and manual sorting 110 to form a series of recovered streams 111 including plastic films 112, PEAD plastic 113, PET plastic 114, plastic mixed 115, beverage cartons 116, paper / cardboard 117 and CDR 120 stream. flat materials stream from the
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Baltic separation 105 is processed in a sequential discontinuous reactor 240 by steam contact 241 with homogenization to form stream 242 comprising a partial hydrolyzate of at least a part of the organic matter contained therein. Stream 242 is fractionated in a trommel 250 having openings of about 5 mm to about 15 mm to form a through stream 255 enriched in cellulosic components and a sink current 251 enriched in combustible material. The through stream 255 is processed in a pollutant separation stage 260 to remove the inert components therefrom as stream 261 and form a stream rich in oligosaccharide 262 to combine with the clean bio-waste stream 185 for conversion to monosaccharides. The contaminant separation step 260 may be any unit operation suitable for separating and removing inert components, inorganic compounds, enzymatic hydrolysis inhibitors and / or fermentation inhibitors of organic material such as cellulose, hemicellulose, lignocellulose and starch. In some aspects of the present invention, the separation step 260 suitably comprises the formation of an aqueous suspension of the through stream 255, crushing the suspension, removing contaminants 261 in the form of a sludge, and with dehydration to remove additional contaminants of the liquid phase and forming a stream rich in oligosaccharide 262. In some additional aspects of the present invention, the separation stage 260 suitably comprises a stage of dry separation where the passing current 255 is fractionated to eliminate a fraction of fine particulate matter 261 enriched in inorganic components (ash) compared to the stream rich in oligosaccharide 262.
As a further reference to Figure 2, the fuel streams derived from waste 120, 202 and 251 are combined to form the CDR stream 205 which can be processed by conditioning CDR 220 described herein as by, for example, conditioning CDR 220 plotted in Figure 4, to generate a fuel source. The clean bio-waste stream 185 and the oligosaccharide-rich stream 262 can optionally be processed by impregnation 310 to form an impregnated bio-waste stream 311. In any of the different aspects of the present invention, the clean bio-waste stream 185 and the oligosaccharide-rich stream 262 can be impregnated with water, aqueous acid solution (e.g., sulfuric acid) or aqueous basic solution (e.g., hydroxide of ammonium) to a water content of about 10% by weight to about 60% by weight. The impregnated bio-waste stream 311 is processed by steam pre-treatment at elevated pressure and temperature 320 to form a pre-treated stream of bio-waste 321 in which (1) the lignocellulosic biomass contained therein
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it degrades to give (i) cellulose and hemicellulose at least partially from lignin thereby increasing the accessibility of cellulose and hemicellulose to enzymatic hydrolysis and (ii) generating xylose from the degradation of hemicellulose, (2 ) the starch contained in the above is gelatinized and (3) the current is sterilized. In some aspects of the present invention, (i) the pretreated stream of bio-waste 321 is cooled from about 70 ° C to about 100 ° C and (ii) the pH is adjusted, if necessary, enzymatic hydrolysis 330, of the stream of bio-waste 321 pretreated with an enzyme source 331 comprising cellulase and / or hemicellulase to form the hydrolyzed bio-waste stream 335, brought into contact therewith with a source of at least one fermentation organism 341 in the fermentation stage 340, and optional contacting with additional enzymes 342, to form a fermentation product 345 proceeds as described with respect to Figure 1. The clean bio-waste stream 185 and the current rich in solid bio-waste 262, instead, can be convert suitably into monosaccharides and fermentation products according to any method included in the scope of the present invention, such as, for example, the schemes represented graphically in any of Figures 1 (that is, in the absence of impregnation), and 3.
Figure 3 graphically depicts a third aspect of the present invention that generally corresponds to Figure 2 with respect to manual classification 5 (optional), tromel 10, tromel 20, tromel 50, tromel 30, ballast separation 100, manual fractionation stages 200 and the sinking current 11, through current 12, fine material stream 102, raw cellulosic bio-waste stream 15, rolling stock stream 101, through current 21, sink current 25, through current 51, current from sinking 35, sinking current 55, flat materials current 105, through current 31 and CDR 202 current. In additional relation to Figure 3, the through current 35 of the trommel 30 is fractionated by X-ray separation 160 to form the current 166 where a plurality of the objects included therein are characterized by having an average particle size in the largest dimension of less than about 25 mm and the entity 162 that is enriched in inorganic material compared to stream 166. The sink current 56 is divided into an optical classification stage 170 to form the bio-waste stream 171 and the stream rich in recyclable materials 175 in which the stream of Bio-waste 171 is enriched in organic compounds compared to the stream rich in recyclable materials 175 and the stream rich in recyclable materials 175 is enriched in recyclable material comprising plastic compared to the stream of bio-waste 171. The stream of bio-waste 171 and the stream sinking 55 from the trommel 50 are divided by separation by
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X-rays 160 to form the bio-rich stream 167 in which a plurality of the objects included therein are characterized by having an average particle size in the largest dimension of about 25 mm to about 80 mm and the current 162 which it is enriched in inorganic material when compared to currents 167. The particle size of the bio-waste stream 167 is reduced in a milling step 180 to form the ground of bio-waste ground 181 which is combined with the clean bio-waste stream 166 to form the stream of bio-waste 169 for conversion into monosaccharides and fermentation products. As depicted in more detail in Figure 7, X-ray separation 160 may comprise 3 stages of X-ray separation, 160A to process stream 35 to form a stream rich in bio-waste 166 and a stream rich in inorganic material 162, 160B to process stream 55 to form a stream rich in bio-waste 167A and a stream rich in inorganic material 163, and 160C to process stream 171 by optical sorting to form a stream rich in bio-waste 167B and a stream rich in inorganic material 164. Each of the streams 167A and 167B has an average particle size in the largest dimension greater than about 25 mm and is fragmented in a mill 180 to form the bio-waste stream 181 that is combined with the stream of bio-waste 166 to form a stream of clean bio-waste 169 for conversion into monosaccharides. Either of the streams 162, 163 or 164 can be purged from the process, optionally, or it can be further fractionated such as by an optical classification stage 110, by density separation (not graphically represented), by a specific optical classification (not represented graphically), or one of its combinations.
As a further reference to Figure 3, the rolling stock stream from the ballistic separation 101 and the stream rich in recyclable materials 175 are fractionated by a method generally corresponding to Figure 1 with respect to the optical classification of the rolling stock and the manual sorting stage 110 and the optional optical sorting stage 201 of the ballastic flat material stream 210 to form the recovered streams 111 including plastic films 112, PEAD plastic 113, PET plastic 114, mixed plastic 115, beverage cartons 116, paper / cardboard 117, CDR current 120, CDR current 215 and paper and cardboard current 211. The CDR streams 120, 202 and 215 are combined in a CDR stream 205 which is processed by CDR conditioning 220 described herein as by , for example, the conditioning of CDR 220 graphically depicted in Figure 4 to generate a source of combustible material.
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As an additional reference to Figure 3, in some aspects of the present invention, the bio-waste stream 169 is combined with at least one aqueous stream to form a suspension that can be mixed. The soluble components of the bio-waste comprising the distribution of the monosaccharide sugars between the aqueous phase and the suspension are subjected to a solid-liquid separation 300 to form a liquid bio-waste stream 301 comprising soluble monosaccharides and a solid bio-waste stream 305 which It comprises insoluble components of bio-waste that includes cellulose, lignocellulose, hemicellulose and starch. The solid-liquid separation can be carried out suitably by filtration or centrifugation. In some additional aspects of the present invention, the bio-waste stream 169 is retained in a filtration screen or centrifugal screen and an aqueous medium is passed through the bio-waste stream 169 to extract soluble monosaccharides therefrom and form a liquid bio-waste stream 301 and a solid biomass stream 305. In any of these aspects, the solid biomass stream 305 is hydrolyzed to form the pretreated bio-waste stream 321 by impregnation 310 to form the impregnated solid biomass stream 311 followed by pretreatment with steam 320 (which optionally includes contacting an a-amylase) as described in general with respect to Figure 2. The liquid bio-waste stream 301 is sterilized in the sanitization operation 350 by any suitable method such as high temperature and / or ultraviolet light and the stream of sterilized liquid bio-waste 351 was combined na with the pretreated bio-waste stream 321. The combined streams are contacted with an enzyme source 331 comprising cellulase and / or hemicellulase in an enzymatic hydrolysis operation 330 to form the hydrolyzed bio-waste stream 335 comprising dextrin and sugars glucose and xylose monosaccharides as described herein with respect to Figures 1 and 2. The hydrolyzed bio-waste stream 335 is combined with a source of at least one fermentation organism 341 in the fermentation stage 340, and placed optionally in contact with additional enzymes 342, to convert glucose into a fermentation product 345 as described herein with respect to Figures 1 and 2.
Figure 4 graphically depicts a fourth aspect of the present invention for the processing of CDR 205 and the processing of the clean bio-waste stream 47, the bio-waste stream 169 and the clean bio-waste stream 185 to obtain a glucose syrup. In the conditioning of CDR 220, the particle size of the CDR stream 205 is reduced in a crusher 221 to form a shredded stream 222 that is fractionated by air classification 225 to form a heavy stream 226 enriched in non-combustible material compared to the light current 227. The
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Particle size of the light stream 227, enriched in combustible material compared to the heavy stream 226, is reduced in a secondary crusher 230 to form a CSR 235. Optionally, not graphically depicted in Figure 4, the CSR 235 is It can dry to increase its calorific value and improve the handling properties of the material. In conversion 400 of the CSR, the CSR is used as a fuel source in simultaneous incineration and incineration, for example in boilers and cement production furnaces or can be converted appropriately into hydrocarbons of variable length or mixed alcohols with gasification methods known in the art as described elsewhere in this document.
As further illustrated in Figure 4, any of the clean bio-waste stream 47 (Figure 1), bio-waste stream 169 (Figure 3) or clean bio-waste stream 185 (Figure 2), collectively referred to as clean bio-waste streams, is They can turn into glucose syrup. In a first stage, the clean bio-waste stream is subjected to pre-treatment 360 to form the pre-treated bio-waste 365. The pre-treatment 360 generally encompasses high temperature and high pressure steam treatment of a bio-residual material, and optionally further comprises the impregnation with water, acid or base before steam pretreatment, as described elsewhere in this document as described with respect to Figures 1 to 3. In some aspects of the present invention, pretreated bio-waste 365 may be placed in contact with a-amylase after adequate cooling and pH adjustment to form dextrin from gelatinized starch. Enzymatic hydrolysis 330 of the pre-treated bio-waste 365 by contacting an enzyme source comprising cellulase 331 to form the hydrolyzed bio-waste stream 335 as described elsewhere in this document with respect to Figures 1 to 3. The current of hydrolyzed bio-waste 335 is separated into a liquid stream 301 comprising glucose and a solid biomass stream 305 comprising insoluble components of the bio-residue comprising cellulose, hemicellulose, lignocellulose, lignin and starch. The separation can be carried out suitably by filtration or centrifugation. Liquid stream 301 is sterilized and concentrated 370 to remove water 371 and form a concentrated glucose syrup 375. In some aspects of the present invention, sterilization and concentration can be carried out by distillation, such as vacuum distillation. In some additional aspects of the present invention, sterilization can be carried out by high temperature treatment or UV radiation, and the concentration can be carried out by reverse osmosis or chromatography. In more additional aspects of the present invention, not graphically depicted in Figure 4, glucose can be separated from a mixture of other monosaccharides such as
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fructose, xylose, galactose and arabinose by chromatographic separation using a suitable resin such as a strong cationic resin. The solid biomass stream can optionally be used as a fuel source in incineration in simultaneous incineration, for example in boilers and cement production furnaces or it can be suitably converted into hydrocarbons of variable length or mixed alcohols with gasification methods known in the technique as described elsewhere in this document.
Figure 5 graphically depicts a fifth aspect of the present invention where a stream of mixed solid bio-waste 450 is fractionated to form rejection streams 31 and 151 enriched in inorganic material compared to the stream of solid bio-waste 450, a stream rich in recyclable materials 175 enriched in recyclable material compared to the stream of mixed solid bio-waste 450 and a stream of clean bio-waste 47. The fractionation of the bio-waste stream 450 with the throttle 30 and the density separator 150 to generate the rejection currents 31 and 151, the sink current 35 and the light material stream 155 generally take place according to the graphically represented method in Figure 1 to process the bio-waste stream 15. The stream of light material 155 is divided into a trommel 60 having openings of about 50 mm to about 70 mm to form a sinking stream 61 enriched in plastic compared to the stream of light material 155 and a passing current 65 enriched in organic material compared to the current of light material 155. The sinking current 61 is divided by optical classification 170 to recover the current rich in organic material 172 and a recycled current 175 which is enriched in recyclable material. The stream rich in organic material 172 and the through stream 65 are divided into a barrel 40 having openings of about 20 mm to about 40 mm to form a sinking current 41 and a clean through bio-waste stream 45. The particle size of the sinking current 41 is reduced in a mill 180 to form the bio-waste stream 181 which is combined with the bio-waste stream 45 to form a clean bio-waste stream 47 for conversion into monosaccharides and, optionally, fermentation products according to any of the different aspects of the present invention.
In any of the different aspects of the present invention, the solid waste mixture can be pre-classified manually, and / or any of the different fractional waste streams can be further processed by manual sorting to recover dangerous objects and materials, remove objects that could damage the team
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of classification of RSU and / or recover objects that are large and have a relatively high recovery value. Manual sorting can be carried out by personnel on one or more pre-classification lines such as counting the waste on a sorting conveyor belt in which the pre-classified objects are identified and removed. Examples of manually classified objects include electronic waste, structural steel, tires and tires, containers comprising pressurized compounds (for example, propane), concrete blocks, large rocks, shovels, cardboard, plaster, and the like. In addition, hazardous wastes such as solvent and chemical substances containers, paint cans and batteries are preferably removed before fractionation to avoid contamination of bio-waste and other materials from the waste mixture.
In any of the different aspects of the present invention, the solid waste mixture, optionally subjected to a manual pre-classification stage, can be fractionated by size separation (eg screening) to form at least three dimensioned residual currents that it comprises a first through current enriched in bio-waste compared to the solid waste mixture, a second through current enriched in rolling stock compared to the solid waste mixture and a sinking current enriched in paper and cardboard compared to the waste mixture solid. Suitable screening devices include rotary trommels, disc sieves, vibrating sieves, and oscillating sieves.
Normally, each stage of fractionation by size is associated with a cutting size where the fractionated particles are characterized by a distribution of the particles. In the case of fractionation by size, the distribution often includes a number of particles or objects above or below a specific cut, such as a sieve having a fixed aperture size, such as 10 mm, 25 mm, 80 mm , 200 mm or 350 mm. Unless otherwise specified, a cut-off number (for example, 80 mm) generally means that at least 75% by weight, at least 80% by weight, at least 85% by weight, at least one 95% by weight, at least 95% by weight or at least 99% by weight of the particles or components have a size greater than the cutting number (in the case of a sinking current) and at least 75% by weight, at least 80% by weight, at least 85% by weight or at least 90% by weight, at least 95% by weight or at least 99% by weight of the particles or components have a size less than the cut-off number (in the case of a through current). In other words, an average particle size refers to a distribution per particle size where at least 75% by weight, at least 80% by weight, at least 85% by weight or at least 90% by weight. weight, at least 95% by weight or at least 99% by weight of the particles or
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components pass through a sieve that has a specific opening size. In another characterization of fractionation by size, the dimensioned residual currents have a distribution of sizes with a relationship between small particles and large particles, that is, the relationship between the particles above the cut and the particles below the cut, of less than 25, less than 20, less than 15, less than 10, less than 8, less than 6, or less than 4. In the case of fractionation by density or spatial configuration (shape), the distribution often includes a number of particle or objects above or below a specific cut, that is, density or shape (two-dimensional or three-dimensional). Unless otherwise specified, a density cut-off number means that at least 50% by weight, at least 60% by weight, at least 70% by weight, at least 80% by weight or at least one 90% by weight, such as from about 60% by weight to about 90% by weight or from about 60% by weight to about 75% by weight, of the particles or components have a density greater than the cutting number (in the case of a sinking current) and at least 50% by weight, at least 60% by weight, at least 70% by weight, at least 80% by weight or at least 90% by weight, such as from about 60% by weight to about 90% by weight or from about 60% by weight to about 75% by weight, of the particles or components have a density less than the cut-off number (in the case of a passing current).
In some aspects of the present invention, a first screen and a second screen are used in series to form at least three fractional residual currents according to size. In these aspects, the opening size of the first screen is approximately 60 mm, approximately 70 mm, approximately 80 mm,
approximately 90 mm or approximately 100 mm, and their intervals, such as from approximately 60 mm to approximately 100 mm or from approximately 70 mm to approximately 90 mm. The opening size of the second sieve is approximately 170 mm, approximately 180 mm, approximately 190 mm, approximately 200 mm, approximately 210 mm, approximately 220 mm, approximately 230 mm, approximately 240 mm, approximately 250 mm, approximately 260 mm,
approximately 270 mm, approximately 280 mm, approximately 290 mm,
approximately 300 mm, approximately 310 mm, approximately 320 mm,
approximately 330 mm, approximately 340 mm, approximately 350 mm,
approximately 360 mm, approximately 370 mm, or approximately 380 mm, and their intervals, such as from approximately 170 mm to approximately 380 mm or from approximately 200 mm to approximately 350 mm. In these aspects, the through currents of the first sieve and the second sieve and a sinking current of the
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Second sieve
In some additional aspects of the present invention, the first sieve described above is used in series with a second sieve and a third sieve to obtain at least four fractional residual currents according to size. The sinking current of the first sieve is fractionated with the second sieve having openings of approximately 170 mm, approximately 180 mm, approximately 190 mm, approximately 200 mm, approximately 210 mm, approximately 220 mm, or approximately 230 mm, and their intervals, such as from about 170 mm to about 230 mm, or from about 190 mm to about 210 mm, to form a second through current and a second sink current in which (1) the second through current is enriched in rolling stock in comparison with the first sink current and (2) the second sink current is enriched in flat materials compared to the second through current. The second sinking current is fractionated with the third one having openings of approximately 320 mm, approximately 330 mm, approximately 340 mm, approximately 350 mm, approximately 360 mm, approximately 370 mm, or approximately 380 mm, and their intervals, such as approximately 320 mm to approximately 380 mm, or approximately 340 mm to approximately 360 mm, to form a third through current and a third sinking current in which (1) the third through current is enriched in waste in bags compared to the third sinking current and (2) the third sinking current is enriched in flat materials compared to the second sinking current. In said aspects of the present invention, the third through current is preferably processed in a bag opening apparatus to release the component included therein for further fractionation.
In some aspects of the invention, rotary tromel type sieves are used. A rotary throttle sieve typically comprises a perforated cylindrical drum or a cylindrical frame that holds a perforated sieve. The trommel can be adequately raised at an angle at the end of the feed or at the end of the discharge, or it may be not raised (i.e. flat). The separation by sizes is achieved as the fed material moves in a spiral or otherwise as it advances inside the rotating drum / sieve, where the material of smaller size than the sieve openings crosses the sieve as a fraction through and the material larger than the sieve openings is retained if it moves forward as a sunken fraction. For the drum component, an internal screw can optionally be used when the arrangement of the drum is flat or raised at an angle less than about 5 °. He
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Internal screw facilitates the movement of objects inside the drum forcing them into a spiral movement. Any of the different tromel designs known in the art is suitable for carrying out the different aspects of the present invention. For example, a drum can be used that has two or more concentric sieves with the thickest sieve located in the innermost section. As an alternative, the trommels can be arranged in series so that the passing and / or sinking material exiting a first trommel can be subsequently fed to a second trommel or a series of trompels. Even alternatively, a trommel can be used that has at least two sections with different opening sizes, said tromel being optionally arranged in series with one or more additional trompels as described above. The tromel type sieve can take different configurations. The sieves can suitably be perforated plates or mesh sieves where the openings can have both square and round shapes.
Screen optimization can be based on one or more of the following variables: (1) the necessary dimension of the through product, (2) the opening surface where a square opening provides a surface greater than a round opening having the same diameter that the length of the square opening, (3) the degree of agitation of the material, (4) the speed of rotation of the drum, (5) the speed of feeding, (6) the residence time of the material, (7) the angle of inclination of the drum, (8) the number and size of openings of the sieve, and (9) the characteristics of the feeding.
The passing currents enriched in rolling stock are fractionated to separate the included fine material, two-dimensional components (for example paper and cardboard ("PyC")) and three-dimensional components (for example, rolling material) thus forming a stream of fine material, a stream of rolling stock and a stream of flat materials in which the stream of fine material is enriched in bio-waste compared to the stream of rolling stock and the stream of flat materials, the stream of rolling stock is enriched in plastic compared to The current of fine material and the current of rolling stock, and the current of flat materials is enriched in PyC compared to the current of fine material and the current of rolling material.
The fractionation of any of the different process streams such as through streams, streams comprising a mixture of two-dimensional and three-dimensional objects, and / or streams comprising heavy fine components, can be achieved by any of the different separation techniques by density
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known in the art such as ballast separators or air separators (for example, linear air separators (windshifters pneumatic separators) and rotary air separators).
In some aspects of the present invention, the fractionation of the passing currents enriched in rolling stock is carried out by ballistic separation with screening. In general, ballistic separation with screening separates feed streams based on their size, density and shape properties to form a first fraction comprising rolling objects (e.g., containers, plastic bottles, stone, boats and some metal objects ), a second fraction comprising flat (planar) and light materials (for example films, textiles, paper and cardboard), and a third sieve fraction of fine material (for example, organic material, food and sand). Such ballast separators generally comprise an upward slope ramp from the feed end to the discharge end and additionally include a perforated conveyor. As the material is transported, the rolling material rotates in the direction of the point of lowest elevation at the end of the feed and forms the fraction of rolling stock, the fine material elements pass through the sieve and constitute the fraction of fine material, and the flat and light elements are transported to the exit to form the current of flat materials. Optionally, air can be blown from the feed end to the discharge end to improve the separation efficiency of flat materials and rolling stock, and the conveyor can be vibrated or oscillated, optionally, to improve the separation efficiency of fine material.
The optimization of the ballistic separation can be based on one or more of the following variables: (1) the desired particle size of the fine material, (2) the location of the feed on the conveyor belt, (3) the feed rate , (4) the residence time of the material, (5) the angle of inclination of the conveyor belt, (6) the number and size of sieve openings, (7) the characteristics of the feed, (8) the speed of the air and (9) the degree of vibration or oscillation.
In some aspects of the present invention, the opening of the perforations of the ballistic sieve (openings) may suitably be about 100 mm, about 90 mm, about 80 mm, about 70 mm, or about 60 mm, and their intervals, such as from about 60 mm to about 100 mm. The openings can have both square and round shapes. In some aspects of the present invention, the size of the opening is of
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approximately 80 mm, the fine material is an 80 mm through current characterized by having an organic substance content of at least 40% by weight, at least 50% by weight or at least 60% by weight. The rolling stock stream is characterized by a glass component and a mixed plastic component comprising PET and HDPE. The rolling stock may also comprise a mixture of metals including aluminum, brass, copper, iron and steel. The flow of flat materials is characterized by a PyC component. In some aspects, the flow of flat materials is further characterized by having a combustible component, CDR, which has a calorific value of at least about 15, 16 or 17 megajoules per kilogram on a dry basis (approximately 7500 Btu per pound).
In some aspects of the invention, the first through-stream of bio-waste (i.e., the through material of the first sieve from 60 mm to 100 mm) is combined with the stream of fine material from the enriched ballistic separation in bio-waste separated from the stream of rolling stock to form a combined raw bio-waste stream. The raw bio-waste stream is characterized by an organic matter content of at least 30% by weight, an inorganic content of at least 20% by weight, and smaller amounts of mixed plastic, paper, glass and mixture of metals The crude bio-waste stream can be fractionated by various methods within the scope of the present invention as described herein to form a clean bio-waste stream for conversion into monosaccharides, a stream rich in inorganic material for disposal. , and several streams of plastic, glass, paper and metal for additional fractionation.
In a first aspect of fractionation of the crude bio-residue of the present invention, the crude bio-waste stream is fractionated with a sieve as described elsewhere in this document and having a mesh size of about 5 mm to about 15 mm, from about 8 mm to about 12 mm, or from about 10 mm to form (i) a through current having an inorganic material content of at least 50% by weight, at least 55% by weight, or at less than 60% by weight, such as about 65% by weight and an organic matter content of less than 50% by weight, less than 45% by weight or less than 40% by weight, such as about 35% by weight and (ii) a sinking raw bio-waste stream having an organic matter content of at least 40% by weight, at least 45% by weight, at least 50% by weight, at least 55% by weight weight or at least 60% by weight and having an average particle size of between about 5 mm and about 80 mm, between about 10 mm and about 80 mm, or
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between approximately 15 mm and approximately 80 mm, and also comprising a recyclable component comprising plastic. The through stream rich in inorganic material can be optionally purged from the process.
In these aspects of the invention, the sinking crude bio-waste stream can be processed by density separation to form a second dense rejection current and an intermediate bio-waste stream. The second rejection stream is enriched in inorganic compounds, glass and metal, and has a high density in grams per cubic centimeter, compared to the intermediate bio-waste stream. The second rejection stream can be purged from the process, or it can be further processed for the recovery of the metal, glass and / or organic compounds included by any of the different methods described herein. Suitable density separation methods are known in the art and include, without limitation, air separators such as linear air separators (windshifters) available, for example, from Nihot) and rotary air separators. These linear air separators separate a feed stream into light and heavy fractions where light materials are separated from heavy materials in a separation unit with air flow control. The light materials are separated from the air stream in the separation unit and transported outside the separation unit and the heavy fraction is retained in the separation unit. The separation efficiency varies with the composition of the feed stream, but typically from about 70% by weight to about 80% by weight or from about 75% by weight to about 85% by weight of the inert material (for example, inorganic material ) is separated from the heavy fraction and at least 95% by weight or at least 98% by weight of the paper and the cardboard is separated from the light fraction. The rotary air separation comprises a device that has an opening provided with a sleeve through which air is blown, the sleeve being surrounded by a cylindrical sieve that rotates past the opening. The material to be separated is deposited on the sieve in the area of the opening of the sleeve, and the fine material is carried through the sieve as a passing current (as allowed by the size of the sieve opening) and transported by the flow of air to a first collection point. The sinking material is dragged into the sieve and transported through the sieve beyond the sleeve to the opposite side of the separator where it is collected at a second collection point. Dense sinking material (such as gravel) is not transported through the sieve, but instead falls from the sieve on the side of the equipment feed and is collected at a third point.
In these aspects of the invention, the intermediate bio-waste fraction is the fraction
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light, where the light fraction is fractionated with a sieve as described elsewhere herein and having a mesh size of about 20 mm to about 30 mm, such as about 25 mm to form (i) a stream of clean through bio-waste having an organic matter content of at least 65% by weight, at least 70% by weight, at least 75% by weight or at least 80% by weight, such as about 70% by weight weight at about 85% by weight or from about 70% by weight to about 80% by weight and having an average particle size of less than about 25 mm, and (ii) a sinking crude bio-waste stream comprising organic material and is enriched in recyclable material (for example, paper, cardboard, metals, glass, plastic, and their combinations) compared to the clean bio-waste stream.
In these aspects of the invention, the sinking crude bio-waste stream can be classified by optical classification and / or X-ray classification to recover a stream enriched in bio-waste in comparison to the sinking raw bio-waste stream and a recovered current enriched in plastic compared to the current of biorresiduo in raw of sunk.
Optical classifiers are known in the art and include, but are not limited to, near infrared (NIR) and color camera classifiers. For example, in one embodiment, the optical classifier can be operated by scanning the intermediate waste stream in free coffee using a camera sensor. Other optical classifiers use near infrared and other scanning technologies to separate the desired materials from mixed currents. In some aspects of the invention, mixed plastic streams can be classified by the type of plastic based on the principle of reaction of electrons in the material of the objects to be analyzed under infrared light, where the molecules in the object to be analyze react with infrared light with a model of electronic excitation characteristic of the composition of the material. The infrared detector and the associated computer read and interpret the model, assign a type of material (for example, HDPE, PET or PVC plastic) according to the interpretation, and classify (separate) objects based on the type of material. In some aspects, a sensor (such as a camera or light sensor) detects a characteristic signal of the material to be separated and transmits the detection signals to an computer system where the signals are analyzed and an algorithm is executed in the computer system to determine the relative composition or identify the material with respect to a preconfigured composition or relative value. The computer system transmits an output signal to activate air jets to quickly eject the material while it is in free coffee. Any number of classifiers
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Optics can be used in series or in parallel. Optical classifier manufacturers include TiTech Pellenc, MSS, NRT, and others.
X-ray classification systems are based on the measurement of X-ray absorptions in a material at different energy levels in order to determine the relative atomic density of the material. More particularly, the absorption of X-rays in a material is a function of the atomic density of the material and also a function of the energy of the incident X-rays where a given piece of material will absorb the X-rays to different degrees depending on the energy of the rays. X incidents In some aspects, an X-ray sensor detects a characteristic signal of the material to be separated and transmits the detection signals to an information system where the signals are analyzed and an algorithm is executed in the computer system to determine the relative composition or identify the material with respect to a preconfigured composition or relative value. The computer system transmits an output signal to activate air jets to quickly eject the material while it is in free coffee. This technology can evaluate the entire object and examine the entire object taking into account exterior and interior variations. Such classification systems are described in US Patent No. 7,564,943 and are commercially available, such as from National Recovery Technologies, LLC of Nashville, Tenn. X-ray classifiers can be used in combination with optical classifiers.
In some classification systems by X-ray absorption, a matrix of dual-energy X-ray detectors is placed below the surface of a conveyor belt used to transport mixed waste through a detection region located between a matrix of detectors and an X-ray tube. Suitable detector matrices can be obtained from Elekon Industries (Torrance, Calif.) and X-ray tubes can be obtained from Lohmann X-ray (Leverkusan, Germany). The X-ray tube is preferably a broadband source that radiates a sheet of X-rays preferably collided through the width of the conveyor belt along the array of dual-energy X-ray detectors such that X-rays They cross this detector region and the conveyor belt before reaching the detectors. As the material crosses the X-ray detection region, the X-rays transmitted through it are detected by the matrix of dual-energy X-ray detectors at two different energy levels. The detection signals are transmitted to an information system and the signals are analyzed by executing an algorithm in the information system to determine the relative composition of the material with respect to a preconfigured relative composition. A matrix of high-speed air ejectors is arranged downstream with respect to the
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detection region and is located perpendicular to the path of the materials discharged by the end of the conveyor belt. The computer executes the algorithm of classification and selection of materials and, according to the results derived from the execution of the algorithm, the signals of the computer system select which air ejectors from the matrix of air ejectors will be activated and expelled, from this shape, the materials selected from the material flow according to the calculated relative composition. The sequence of detection, selection, and ejection can take place simultaneously on multiple paths along the width of the conveyor belt so that multiple samples of material can be analyzed and classified at the same time.
Optical classification systems and X-ray classification systems can be configured to scan a stream of a waste mixture and determine if the material to be analyzed is a particular type of material such as plastic, paper, or glass, and recover (i) HDPE plastic, PET plastic, plastics from 3 to 7 and / or polyvinyl chloride (PVC) type plastics, (ii) glass and / or (iii) paper from a stream of one waste mixture comprising organic particles and / or inorganic particles. Optical classification systems and X-ray classification systems can be further configured to distinguish between types of plastics, such as HDPE plastic, PET plastic and PVC plastic so that a stream containing a mixture of plastics can be classified into streams according to the type of plastic. For example, after the detection of a particular material in a stream of a waste mixture, an optical classification system or an X-ray classification system, air directed towards the nozzles can be used to expel the searched / identified material to produce one or more. more recycled products such as recyclable PET, recyclable HDPE, recyclable plastic film, recyclable plastics from 3 to 7, recyclable glass and / or recyclable paper products.
More particularly, for example, a waste mixture can be introduced into a conveyor, the speed of which is selected so that the waste mixture is released by the end of the conveyor. The optical sensor or the X-ray system is programmed by means of a computer program in a computer system to detect the shape, type of material, color or translucency levels of particular objects. For example, the computer system connected to the optical sensor or X-ray system can be programmed to detect the type of plastic material associated with plastic bottles, such as PET, HDPE, and PVC. Objects that have the preprogrammed material characteristics are detected by the optical sensors or the X-ray system when they pass through a beam of light or X-ray and the computer system connected to the sensor sends a signal that activates an air nozzle for ejection. high pressure. The ejection air nozzle releases a current of
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air that strikes the detected objects in descending order to remove them from their normal path in the direction of a first hopper and / or a first conveyor. Other materials and objects continue their movement along the path to a second hopper and / or a second conveyor. In some aspects of the present invention, any of the different currents generated in a first optical / X-ray classification system can optionally be processed in at least one additional optical / X-ray classification system to produce any one of a stream of plastic material sorted by type (for example, PET, HDPE or PCV), glass sorted by color, paper. The rest of the residual current from one or more optical / X-ray classifiers is typically a stream of particulate material rich in organic material.
In these aspects of the invention, the stream enriched in bio-waste recovered by optical / X-ray classification of the sinking raw bio-waste stream normally has an average particle size between about 25 mm and about 80 mm. The average particle size of said stream is preferably reduced to less than about 25 mm to maximize the relationship between the surface area and the weight to increase the efficiency of the hydrolysis to obtain glucose. Any suitable grinding device, such as a chopper, hammer mill, crusher, knife mill, cutter, disc mill, centrifugal mill or homogenizer, can be used. The recovered ground bio-waste stream is combined with the clean bio-waste stream and subsequently converted to glucose by hydrolysis.
In a second aspect of fractionation of the crude bio-residue of the present invention, the crude bio-waste stream is fractionated with a sieve as described elsewhere herein and having a mesh size of approximately 25 mm to approximately 50 mm to form (i) a through primary stream having an inorganic material content of about 20% by weight to about 40% by weight or from about 25% by weight to about 35% by weight on a dry basis and (ii) a primary stream of raw biorresiduous sinking having an organic material content of about 60% by weight to about 80% by weight or from about 65% by weight to about 75% by weight on a dry basis, and having a size particle average between approximately 25 mm and approximately 80 mm, between approximately 30 mm and approximately 80 mm, between approximately 35 mm and approximately 80 mm, between approximately 40 mm and approximately 80 mm, between approximately 45 mm and approximately 80 mm, or between approximately 50 mm and approximately 80 mm, and
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which additionally comprises recyclable material.
In such aspects, the primary passing current is fractionated with a sieve as described elsewhere in this document and having a mesh size of about 5 mm to about 15 mm, about 8 mm to about 12 mm, or about 10 mm to form (i) a through stream having an inorganic material content of about 60% by weight to about 80% by weight or from about 65% by weight to about 75% by weight on a dry basis and a material content organic from about 20% by weight to about 40% by weight or from about 25% by weight to about 35% by weight and (ii) a sinking crude bio-waste stream having an organic material content of about 65% by weight. weight at about 90% by weight, or from about 70% by weight to about 90% by weight on a dry basis and having an average particle size between about 5 mm and approximately 50 mm, between approximately 5 mm and approximately 25 mm, between approximately 10 mm and approximately 50 mm, between approximately 10 mm and approximately 25 mm, between approximately 15 mm and approximately 50 mm, or between approximately 15 mm and approximately 25 mm. The current rich in through inorganic material can be purged from the process.
In these aspects, the sinking raw bio-waste stream and the primary sinking raw bio-waste stream are fractionated by optical or X-ray classification to generate at least three streams. In some aspects of the present invention, the classification by X-rays is used. Two streams rich in organic material are formed where a first stream has an average particle size of less than 25 mm and a second stream has an average particle size greater than 25 mm The particle size of the second stream is reduced to less than 25 mm in a mill as described elsewhere herein and the first stream and the second ground stream combine to form a clean bio-waste stream for conversion. in monosaccharides, said stream having an organic material content of about 70% by weight to about 90% by weight or from about 75% by weight to about 90% by weight. A third stream generated by optical classification is enriched in recyclable material compared to the clean bio-waste stream. The third stream can be purged from the process, optionally, or it can be further fractionated such as by optical / X-ray classification, density separation, or a combination thereof, to recover the included components for recycling or further processing.
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In part of the second aspect of fractionation of the raw bio-residue of the present invention, a crude bio-waste stream is divided into a two-stage sieve scheme through a first screen having openings of about 20 mm to about 30 mm, such as approximately 25 mm, and through a second screen having openings of approximately 40 mm to approximately 60 mm, such as approximately 50 mm, to form a first through current that crosses the openings of 20 mm to 30 mm, a second current through which crosses the openings of 40 mm to 60 mm and a sinking current in which the first through current is enriched in inorganic compounds compared to the second through current. The first through stream is fractionated in a trommel having openings of about 5 mm to about 15 mm, such as about 10 mm to form a through stream predominantly comprising inorganic material and a sinking stream enriched in organic material such as cellulose, hemicellulose and starch, compared to the current through. The through current from -5 mm to -15 mm can be purged from the procedure, optionally, to a landfill, or it can be further processed to fractionate and remove different components. The sinking current of +5 mm to +15 mm is processed in a first stage of X-ray separation to form a first rejection current of X-ray separation enriched in inorganic components and a first stream of clean bio-waste enriched in components organic in which the first clean bio-waste stream is characterized by an average particle size of about 5 mm to about 30 mm or about 10 mm to about 25 mm. The second through current that passes through a sieve having openings of approximately 40 mm to approximately 60 mm is processed in a second stage of X-ray separation to form a second rejection current of X-ray separation enriched in inorganic components and a second clean bio-waste stream enriched in organic components in which the second clean bio-waste stream is characterized by an average particle size of about 20 mm to about 60 mm or about 25 mm to about 50 mm. In a first option, the sinking current from the sieve having openings of approximately 40 mm to approximately 60 mm is processed in a third stage of X-ray separation to form a third rejection current of component-enriched X-ray separation inorganic and a third clean bio-waste stream enriched in organic components where the third clean bio-waste stream is characterized by an average particle size of approximately 40 mm to approximately 100 mm or approximately 50 mm to approximately 80 mm. In a second option, the sinking current from the
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sieve having openings of about 40 mm to about 60 mm is processed by optical sorting to form a stream rich in recyclable materials enriched in plastic that is further processed, such as by simultaneous processing with the rolling stock stream at an optical sorting stage , and a stream of bio-wastes from the optical classification enriched in organic components. The bio-waste stream from the optical classification can then be processed in a third stage of X-ray separation as described herein. The second and third stream of clean bio-wastes are fragmented simultaneously to reduce the average particle size to less than about 25 mm and then combined with the first clean bio-waste stream to form a clean bio-waste stream for conversion into monosaccharides. Any of the first, second and third rejection current of the X-ray separation can be purged from the procedure, optionally, or it can be further fractionated such as by optical classification, by density separation, or one of its combinations.
In a third aspect of fractionation of the raw bio-waste of the present invention, the third stream (enriched in recyclable material compared with a clean bio-waste stream) generated by optical or X-ray classification as described above in relation to the second aspect of the present invention is further divided by optical classification to recover streams comprising a stream rich in organic material and a stream rich in recyclable materials that is enriched in recyclable material. In part of the embodiments of the third aspect, paper, cardboard, glass, metals and / or plastics can be recovered as individual fractions or streams. The stream rich in organic material is characterized by a particle size greater than 25 mm, such as from about 25 mm to about 80 mm. This stream is preferably milled as described elsewhere in this document to reduce the particle size to less than 25 mm. The stream, ground or not, is then combined with the clean bio-waste stream for conversion to monosaccharides. The stream enriched in recyclable material, or its individual fractions, are transported to the fractionation of rolling stock by ballistic separation by optical classification and manual classification as described elsewhere in this document for the recovery or purification of plastics, metals, glass, paper and cardboard.
In a fourth aspect of fractionation of the crude bio-residue of the present invention, (i) the crude bio-waste stream is fractionated with a sieve having a size of
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mesh of about 5 mm to about 15 mm to form a through current and a sinking raw bio-waste stream and (ii) the sinking raw bio-waste stream is fractionated by density separation to form a second dense rejection stream and an intermediate bio-waste stream as described herein with respect to the first fractional aspect of the raw bio-residue of the present invention. The intermediate bio-waste stream is fractionated with a sieve having a mesh size of about 50 mm to about 70 mm, such as about 60 mm, to form a second sinking current and a second through current in which the second current of sunk is enriched in recyclable material compared to the second through stream and the second through stream is enriched in bio-waste compared to the second sink current. The second sinking current is fractionated by optical classification and / or X-ray classification to eliminate and recover a stream rich in organic material from the second sinking current. The recycled product streams comprising plastics, metals, glass, paper and / or cardboard can be generated by optical classification and / or X-ray classification, or the second clean sinking current (or fractions thereof) can be transported up to the fractionation of rolling stock by ballistic separation by optical classification and manual classification as described elsewhere in this document for the recovery or purification of plastics, metals, glass, paper and cardboard. In some aspects of the present invention, the optical classification is used.
The second through stream rich in bio-waste (which has an average particle size greater than about 60 mm) is combined with the second through current (which has an average particle size smaller than about 70 mm) to form a bio-waste stream that has an organic matter content of at least 50% by weight, at least 55% by weight, at least 60% by weight, or at least 65% by weight, such as about 60% by weight. The combined streams are fractionated with a sieve having a mesh size of about 20 mm to about 30 mm, such as about 25 mm, to form a clean through bio-waste stream and a sink current. The sinking stream is preferably milled as described elsewhere herein to form a stream of ground bio-waste having a particle size of less than about 25 mm. The ground bio-waste stream is combined with the clean bio-waste stream for conversion into monosaccharides.
In any of the different aspects of the present invention, the current of
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Clean bio-waste comprises an organic material content of about 70% by weight to about 90% by weight or from about 75% by weight to about 90% by weight. The clean bio-waste stream comprises a soluble organic component and an insoluble organic component. The soluble organic component comprises from about 2% by weight to about 10% by weight, or from about 2% by weight to about 5% by weight of glucan and from about 0.05% by weight to about 1% by weight of xylan . The insoluble component comprises from about 5% by weight to about 20% by weight or from about 8% by weight to about 20% by weight of glucan, from about 1% by weight to about 10% by weight or from about 2% by weight. weight to about 5% by weight of xylan, from about 20% by weight to about 40% by weight or from about 25% by weight to about 35% by weight of cellulose and from about 5% by weight to about 15% by weight of lignocellulose. The clean bio-waste stream further comprises less than about 40% by weight, less than about 35% by weight, less than about 30% by weight, less than about 25% by weight, less than about 20% by weight. weight or less than about 15% by weight of ash (inorganic material).
In any of the different aspects of the present invention, the rolling stock stream is fractionated by optical classification and / or X-ray separation as described elsewhere herein, optionally with the additional combination of at least one stage. of manual classification, to isolate a number of streams rich in recyclable materials including a plastic film stream, a PEAD stream, a PET stream, and a mixed plastic stream. Other possible streams rich in recyclable materials generated from the fractional rolling stock stream may include glass streams classified by color, a PVC plastic stream, a mixed glass stream, a mixed metal stream, metal streams sorted by alloy ( for example, aluminum, brass and copper), a stream of beverage cartons, a stream of paper and / or a stream of cardboard. The residual material that remains after the fractionation of the rolling stock stream is enriched in material fuel compared to the different recovered streams, and is sent to the CDR conditioning as described elsewhere herein.
In some aspects of the present invention, the flow of flat materials generated in the two-dimensional / three-dimensional fractionation (eg, ballistic separation) of the through current (s) enriched in rolling stock can be classified
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optionally by optical classification as described elsewhere herein to form a recovered PyC stream and a CDR rich stream. The CDR-rich stream is sent to the CDR conditioning as described elsewhere herein. The PyC stream can be optionally sold or processed to recover the cellulosic fiber for conversion into monosaccharides.
In some aspects of the present invention, the stream of flat materials comprising PyC generated in the two-dimensional / three-dimensional fractionation (eg, ballistic separation) of the passing current (s) enriched in rolling stock can optionally be processed in a sequential batch reactor ("RDS") to recover a cellulosic fiber stream for conversion to monosaccharides by hydrolysis of cellulosic materials and a CDR rich stream. The RDS included in the scope of the invention include an inclined rotary cylinder with direct steam injection and which has internal alerts or other means known in the art to induce mixing and homogenization of the material during turning. The stream of flat materials is introduced into the RDS and contacted with steam to increase the temperature to approximately 40 ° C, 50 ° C, 60 ° C, 70 ° C, 80 ° C or 90 ° C, and their intervals , such as from about 40 ° C to about 80 ° C, to initiate digestion and / or hydrolysis of cellulosic material, and to reduce particle size. Optimization can be based on one or more of the following variables: (1) the characteristics of the feeding, (2) the temperature, (3) the feeding speed and residence time, (4) the angle of inclination, ( 5) the degree of turning, and (6) the speed of rotation.
In said aspects of the present invention, the RDS discharge current is fractionated with a sieve as described elsewhere in this document and having a mesh size of about 5 mm to about 15 mm, such as about 10 mm , to form a sinking RDS stream comprising CDR and an RDS through stream enriched in cellulosic compounds (cellulose and minor amounts of hemicellulose and lignocellulose) and inorganic compounds as paper fillers. Paper loads are compounds that are normally added to paper in concentrations of up to about 50% by weight ("% by weight) to transmit softness, flexibility, and optical properties such as opacity and color and usually include inorganic compounds and pigments. such as clay (eg, caolfn clay), calcium carbonate and other calcium-containing components, ink particles, titanium dioxide, talc, magnesium-containing components, sodium-containing components, potassium-containing components, silicon-containing components , components that
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they contain phosphorus and components that contain aluminum (collectively referred to as "ashes"). As a problem, paper loads such as calcium carbonate reduce the bioavailability of cellulosic compounds and caolfn clays reduce the activity of cellulolytic and hemicellulolytic enzymes. Therefore, in some aspects of the present invention, the RDS through stream is fractionated to remove contaminants and form a purified cellulosic stream for conversion into monosaccharides.
In one of these aspects of fractionation such as purification, a pass-through suspension of RDS is formed comprising from about 2 to about 8 percent by weight of total solids including cellulosic material and paper loads. The suspension is converted into pulp under shear conditions to form a pulp-shaped suspension comprising cellulosic fiber and released contaminants (paper loads). Pulp formation systems and methods are known in the art. The pulp-shaped suspension is fractionated through a filtration medium that has openings of about 0.2 cm to about 1.5 cm to form a sinking stream comprising thick contaminants and a passing stream comprising cellulosic fibers and contaminants lightweight The through stream can be pretreated as described elsewhere herein to hydrolyze at least a part of the cellulose component into monosaccharides. In some optional aspects, the through stream can be further purified by separating at least a portion of the light contaminants from the cellulosic fiber, such as by washing in a filtration medium or in a centrifuge, to form a contaminant stream lightweight comprising ashes and a cellulosic fiber. Typically, cellulose enriched through streams comprise no more than about 15 percent by weight dry ash, and where the ash content of the cellulosic fiber stream is less than the ash content of the RDS through stream BR on a dry basis In any of these various aspects, the cellulosic fiber stream is dehydrated (thereby eliminating more amount of light contaminants) to form a stream of dehydrated cellulosic fiber having a solids content of about 25% by weight to about 60% in weight and an aqueous stream. In some optional aspects, the separation and removal of contaminants (such as by dissolution) can be enhanced by (i) adding acid to the pulp-shaped suspension to adjust the pH from about 2 to about 6 or (ii) add base to the pulp-shaped suspension to adjust the pH from about 8 to about 12. The stream of dehydrated cellulosic fiber can be converted to glucose, alone or together with clean bio-waste.
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In another of these aspects, the RDS through stream is fractionated dry by screening to remove a fine particle fraction enriched in ashes and form a stream rich in clean solid bio-waste enriched in cellulosic components. In general, the RDS is fractionated by at least one screening screen as described elsewhere in this document to recover the current rich in solid biowaste in at least one screening screen where the fraction of fine particulate material passes through the sieve. In some aspects of the present invention, the sieve separation system includes a sieve having openings of approximately 0.1 mm, approximately 1 mm, approximately 2 mm, approximately 3 mm, approximately 4 mm, approximately 5 mm, approximately 6 mm , and their intervals, such as from about 0.1 mm to about 6 mm, from about 0.5 mm to about 2 mm, or from about 0.5 mm to about 1.5 mm. In several aspects, the screen separation system comprises two screens, such as a first screen having openings of about 3 mm to about 8 mm or about 3 mm to about 6 mm and a second screen having openings of about 0, 5 mm to approximately 2 mm or approximately 0.5 mm to approximately 1.5 mm. The fine particulate material fraction comprises an inorganic material (ash) content of at least 50% by weight, at least 75% by weight, at least 80% by weight, at least 95% by weight, or up to about 95% by weight, such as from about 50% by weight to about 95% by weight or from about 80% by weight to about 95% by weight and the ratio between the ash content of the fine particulate material fraction and the Ash content of the stream rich in clean solid bio-waste is at least 2: 1, at least 3: 1, at least 4: 1 or at least 5: 1. In some additional aspects of the present invention, the removal of a fraction rich in inorganic material from the RDS through-stream can be performed according to rotational air classification methods known in the art as described in US Pat. Nos. 1,629,594, 3,734,287 and 4,869,786, which has been incorporated by reference to this document, or by one or more vibrating screens where the fraction rich in inorganic material forms a fraction of fine material and the stream rich in bio-waste is a thick fraction.
Any of the different CDR currents within the scope of the present invention can be conditioned to form CSR. In accordance with one aspect of the present invention, the various CDR fuels were combined and processed in a primary crusher to reduce the volume. An average typical particle size is about 200 mm to about 350 mm. Suitable shredders include, without limitation, industrial shredders to reduce paper to strips or shredders.
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cardboard including crushers that have one or more shafts that include a number of cutting heads that can cut and / or shred incoming waste materials up to a selected size. An example of a crusher is a counter-rotary screw crusher (available from Munson (Utica, N.Y.)). The shredded material is fractionated by air classification as described herein (such as a linear air separator) to form a light stream and a heavy stream where the light stream is enriched in combustible material compared to the heavy stream. The light stream is processed in a secondary crusher to further reduce the volume and particle size and form CSR. An average typical particle size is about 20 mm to about 50 mm. The CSR can be optionally dried to increase the energy value per unit of weight. The CSR is characterized by having a calorific value of between approximately 17 and approximately 30 megajoules per kilogram (from approximately 7,500 to approximately 13,000 Btu / lb) and less than approximately 20% by weight of water. The CSR within the scope of the present invention can be suitably used as an energy source for boilers and cement production furnaces, or as a gasification substrate.
In any of the different aspects of the present invention, magnetic separation devices can be used at different points of the systems of the present invention to collect ferrous metals. Examples of magnetic separators include magnetic drum, magnetic1 perpendicular tape magnets, heads with magnetic pulleys, and the like. Suitable locations include, without limitation, the sinking and thru-out outputs of the drum and transport systems, heavy current outputs of the density separation and transport systems, and in conjunction with optical classification and X-ray classification systems.
In any of the different aspects of the present invention, one or more electrostatic separators for the isolation and separation of plastic components that can be operated together with one or more of the systems described herein, including air fractionation, fractionation sieves , transport and material transfer systems, optical and X-ray classifiers, and bag opening devices. Electrostatic separation systems are known in the art and are commercially available. In some aspects of the invention, the separation is plastics according to the type can be carried out by electrostatic separation where a current comprising a mixture of plastics is charged electrostatically (for example by friction or application of a load) resulting in a material positively and negatively charged, where PE, PVC and PET plastics have a characteristic and different induced load. By
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For example, PE and PET normally assume a positive charge and PVC normally assumes a negative charge. The positively and negatively charged materials are passed through an electrostatic field formed by counter electrodes on opposite sides where the positively charged plastic migrates to the side of the negative electrode and the negatively charged plastic migrates to the side of the positive electrode resulting in the separation of the plastic by kind. Electrostatic separation systems are available from Hitachi Zosen Corporation.
Clean bio-waste streams and cellulosic fiber streams can be converted into one or more hydrolysis stages to achieve an aqueous stream comprising glucose. In some aspects of the present invention, the glucose stream can be concentrated to form a glucose syrup. In some additional aspects, the glucose stream can be purified to remove impurities and C5 monosaccharides (eg, xylose). In some additional aspects of the present invention, the glucose stream can be contacted with the source of at least one fermentation organism to form a fermentation product.
In some aspects of the bio-waste conversion of the present invention, the clean bio-waste is combined, or impregnated, with at least one aqueous stream with agitation to form a clean bio-waste suspension having a water content of approximately 50% in weight, about 60% by weight, about 70% by weight, about 80% by weight, or about 90% by weight, and their intervals, such as from about 50 to about 90% by weight or about 60 at about 80% by weight. The pH can optionally be adjusted to about 1, 2, 3, 4, 5 or 6, and their ranges, such as between about 1 and about 6, from about 2 to about 6, or from about 3 to about 5 to favor solubilization of at least a part of the starch, dextrin, disacarids and / or monosaccharides contained in the bio-waste and to provide favorable conditions for the hydrolysis of cellulose, hemicellulose and lignocellulose and / or to sterilize the suspension. As used herein, dextrin refers to low molecular weight mixtures of glucose polymers produced by starch hydrolysis and linked by a-1,4 and a-1,6 bonds. In some different aspects, the acid concentration is adjusted to between about 0.01 to about 0.05 kg of acid per kg of clean bio-residue on a solid base. Mineral acids (for example sulfuric acid and hydrochloric acid) or organic acids may be used, and mineral acids are generally preferred. Alternatively, the pH may optionally be adjusted to approximately 8, 9, 10, 11, or 12, and
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its intervals, such as between about 8 and about 12, from about 9 to about 11. In some different aspects, the base is ammonia and the concentration has been adjusted to between about 0.1 to about 0.5 kg per kg of bio-waste Clean on a solid base. The temperature can optionally be set to approximately 30 ° C approximately 40 ° C, approximately 50 ° C, approximately 60 ° C, approximately 70 ° C or
about 80 ° C, and its ranges, such as about 30 ° C to about 80 ° C or between about 40 ° C to about 60 ° C.
The impregnation of clean bio-waste can be carried out by any suitable means known in the art. In one method, the clean bio-wastes are sprayed with water (which optionally comprises acid or base) with mixing in a high shear mixer, such as a belt mixer or a kneading type mixer. The impregnated material is normally maintained for a sufficient period of time before steam pretreatment to allow a balance of humidity and temperature such as approximately 5 minutes, 15 minutes, 30 minutes, 45 minutes or one hour. In another method, a suspension comprising clean bio-waste, water (which optionally comprises acid or base) is formed by mixing at a moisture content of at least about 60% by weight, such as from about 70% by weight to about 90% by weight. weight. The suspension is then dehydrated to result in clean impregnated bio-waste. In any of the various aspects, the final moisture content of the impregnated clean bio-residue is from about 20% by weight to about 80% by weight, 30% by weight to about 70% by weight, or from 30% by weight to about 60 % in weigh.
In some aspects, the suspension of bio-waste or the suspension of bio-waste with adjusted pH is processed by at least one solid-liquid separation step to form a liquid stream comprising soluble components of bio-waste (eg, monosaccharides, disacarids, dextrins and starch soluble) and a solid biomass stream comprising insoluble bio-waste (for example, cellulose, hemicellulose, lignocellulose, minor amounts of dextrin and insoluble starch). Any solid / liquid separation technique known in the art, such as filtration or centrifugation, is suitable for the practice of the present invention.
In any of the various aspects of the hydrolysis of clean bio-waste of the invention, the solid biomass stream (optionally impregnated with water, acid or base) can optionally be contacted at a high temperature and pressure
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followed by a rapid depressurization in a steam pretreatment stage to enhance the accessibility of the cellulosic components of the enzymes. More particularly, the solid biomass stream can be subjected to high pressure and temperature conditions to break cellulose-hemicellulose and cellulose-hemicellulose-lignin complexes. After a period of contact time, the pressure of the solid biomass stream is reduced and / or the treated food is discharged into an environment of reduced pressure, such as atmospheric pressure, to generate a stream of solid biomass treated with treated steam, and evaporate quickly and vent the steam. The change in pressure results in a rapid expansion of the material that therefore helps to crumble the structure of the biomass fiber that includes, for example, the links between lignin (if present) and hemicellulose and / or cellulose in the cellulose-hemicellulose or cellulose-hemicellulose-lignin complex (collectively referred to as "cellulose complexes"). More particularly, by physicochemical means, steam treatment normally dissociates cellulose from hemicellulose and lignin (if present) by providing adequate cellulose for enzymatic hydrolysis of glucose. Steam treatment normally dissociates hemicellulose from the complex, generally in the form of hemicellulose solubilized in a liquid phase of the treated cellulosic biomass. In various aspects, from about 10% by weight to about 20% by weight of the hemicellulose contained in the cellulosic biomass is solubilized in a liquid phase of the treated cellulosic biomass. In this way, steam treatment provides adequate hemicellulose for the enzymatic hydrolysis of monosaccharides. The solid biomass stream for steam pretreatment may have neutral pH or may have acidic pH or basic pH as described above. Alternatively, the solid biomass stream can be impregnated with additional acids or bases before steam pretreatment. The impregnation of acids or bases can be carried out by any means known in the art to achieve a substantially homogeneous mixture, including stirred mixing tanks (followed by a dehydration step), line mixers, kneading mixers, mixing mixers. paddles, tape mixers. In any of the various aspects, solid biomass or impregnated biomass is contacted with steam at a temperature of about 150 ° C to about 250 ° C, from about 150 ° C to about 220 ° C, from about 175 ° C at about 220 ° C, or from about 175 ° C to about 200 ° C and at a pressure of about 400 manometric at about 1750 kPa, about 500 manometric at about 1525 kPa, from about 625 manometric at about 1450 kPa, or from about 1000 manometric kPa to about 1400 kPa. Total contact time at elevated temperature and pressure
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it is about 1 minute to about 60 minutes, about 1 minute to about 30 minutes, about 1 minute to about 10 minutes, or about 2 minutes to about 6 minutes. In some aspects of the invention, the pressure is approximately 600 kPa and the contact time is approximately 8 minutes. In some aspects of the invention, after the contact time has elapsed, the pressure is reduced to less than about 35 kPa, such as about 30 kPa, about 25 kPa, about 20 kPa, about 15 kPa, about 10 kPa, about 5 kPa, slightly above ambient pressure, or approximately at ambient pressure to form the insoluble biomass pretreated with steam (i) in a single stage of pressure reduction or (ii) from about 345 kPa to about 1380 kPa, from about 345 kPa at approximately 1205 kPa, from approximately 690 kPa to approximately 1380 kPa, from approximately 690 kPa to approximately 1205 kPa, from approximately 690 kPa to approximately 1035 kPa, or from approximately 1035 kPa to approximately 1205 kPa in a first stage of pressure reduction and keep it for a period of approximately 0.5 minutes to approximately 30 minutes, approximately 0.5 minutes to approximately 15 minutes, or about 1 minute to about 5 minutes, followed by a reduction to less than about 35 kPa in a second stage.
In some aspects of the present invention, the solid biomass stream (optionally impregnated with an acid or base) is introduced into a container comprising a contact area for steam treatment. The solid biomass stream is normally in the form of a suspension or cake. For example, the solid biomass stream can be pressed to form a cake, or an agglomerate of treated solids for introduction into the steam treatment vessel. The precise shape and configuration of the container are not very critical and can be selected by one skilled in the art depending on the specific circumstances (for example, the properties of the cellulosic biomass and the operating conditions). In general, the container includes an input for the introduction of the solid biomass stream and one or more outputs to release the treated cellulosic biomass and / or the various components generated during steam treatment. Once the solid biomass stream is contained in the vessel, the vessel is pressurized and the solid biomass stream is heated by direct steam injection. In any of the various aspects of steam pretreatment of the invention, a stream of steam or gas can be vented continuously or periodically from the steam pretreatment vessel to purge volatile organic compounds ("VOCs") generated as byproducts of the treatment.
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Steamy acid and cellulose, hemicellulose and lignocellulose known to be fermentation and / or enzymatic inhibitor compounds. Such inhibitors include, for example, acetic, furfural and hydroxymethylfurfural acid ("HMF"). In some other optional aspects other than the invention, the heating of the solid biomass stream can be carried out indirectly, such as by applying steam to a jacketed container. Typically, the solid biomass stream is maintained at an objective temperature and pressure, such as by controlling the pressure, for a time sufficient to provide adequate heating. In some aspects of the present invention, after a period of pressurization of the vessel and the heating of the solid biomass stream, the solid biomass stream is released or transferred from the contact vessel to a receiving vessel having a reduced pressure and controlled. In some additional aspects of the present invention, after a period of pressurization of the container and the heating of the solid bio-waste stream, the pressure and temperature of the container is reduced to an intermediate pressure and temperature and is maintained for a period of time in those conditions, followed by a reduction in pressure or by a pressure slightly higher than atmospheric pressure. In some additional aspects different from the present invention, after a period of pressurization of the vessel and heating of the solid biomass stream, the pressure and temperature in the vessel are reduced to atmospheric pressure or to a pressure slightly higher than atmospheric pressure . In any of the different aspects of the present invention, as noted, the sudden decrease in pressure during this release promotes cellulose complex rupture. That is, the sudden decrease in pressure produces a rapid increase in the volume of steam and gases trapped inside the porous structure of the biomass which results in very fast incident gas velocities and / or rapid vaporization of the heated water that has either occupied or been forced into the fibrous structure. In cases where the differential pressure is sufficiently high and where the pressure change occurs rapidly, the associated rapid vaporization and gas velocity occur essentially instantaneously in a method known in the art as steam explosion. In any of the different aspects of the present invention, the depressurization step generates a sudden, sudden vapor stream comprising various VOCs as described above ").
The stream of solid biomass pretreated with steam is combined with (1) the liquid stream comprising the components of the soluble bio-residue and / or an aqueous stream and (2) a source of enzymes comprising at least cellulase to generate a hydrolyzate comprising glucose . Cellulases are a class of enzymes produced primarily by
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fungi, bacteria, and protozoa that catalyze cellulolysis (hydrolysis) of cellulose into glucose, cellobiose, celotriose, celotetrose, celopentose, cellohexose, and longer chain celodextrins. Combinations of the three basic types of cellulases can be used. For example, endocellulases can be added to randomly hydrolyze the p-1,4, -D-glycosidic bonds in order to disrupt the crystalline structure of the cellulose and expose the individual cellulose chains. Exocellulases can be added to cleave two units (cellobiose), three units (celotriose), or four units (celotetrose) from the exposed chains, while p-glucosidase can be added to hydrolyze these compounds to glucose, which is available for fermentation . Examples of suitable cellulases include, for example, Cellic® CTec2, Cellic® CTec3, CELLUCLAST®, CELLUZYME®, CEREFLO® and ULTRAFLO® (available from Novozymes A / S), LAMINEX®, SPEZYME®CP (Genencor Int.), and ROHAMENT® 7069 W (Rohm GmbH), and GC-220 (Genencor International). The liquid stream is preferably sterilized to destroy microbes before being combined with the steam from the pretreated solid biomass stream. Sterilization can be carried out by, for example, temperature treatment, UV radiation, or one of its combinations.
In any of the various aspects, in general, a suspension is formed from the liquid and the streams of the solid biomass are pretreated under favorable conditions for cellulase activity. More particularly, the pH of the suspension is preferably adjusted from about 4 to about 6.5, from about 4.5 to about 6, or from about 5 to about 5.5, the temperature of the suspension is adjusted from about 35 ° C at about 70 ° C, from about 45 ° C to about 65 ° C, or from about 50 ° C to about 60 ° C and the suspended solids content is preferably adjusted to about 10% by weight, about 15% by weight. weight, about 20% by weight, about 25% by weight or about 30% by weight of total solids ("ST"), and their ranges, such as from about 15% to about 25% ST or from about 18% to about 22% TS, with one or more process water, or aqueous recirculation stream. The cellulase load in the suspension can be suitably varied with the cellulose content, but the typical load can be expressed as from about 5 mg to about 50 mg, from about 10 mg to about 50 mg, from about 20 mg to about 50 mg, from about 10 mg to about 50 mg, from about 10 mg to about 40 mg, from about 10 mg to about 30 mg, from about 20 mg to about 50 mg or from about 20 mg to about 40 mg of cellulase per gram of cellulose.
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Expressed another way, the cellulase load is about 10 to about 40 mg of enzymatic protein per gram of cellulose in the treated cellulosic biomass.
The cellulase can be combined with the treated biomass suspension by any means known in the art to achieve a substantially homogeneous mixture, including stirred mix tanks, line mixers, kneading mixers, paddle mixers, belt mixers, or in reactors of liquefaction such as reactors having at least one mixing section and at least one piston flow section. The enzymatic hydrolysis reactor is normally a stirred vessel designed to maintain the biomass suspension-cellulase mixture at a temperature suitable for cellulose hydrolysis by cellulase, where the volume is sufficient to provide the necessary maintenance time for a Significant yield of hexose monosaccharide sugars derived from cellulose ("C6"), for example, glucose. In some aspects of the present invention, the enzymatic hydrolysis vessel can be isolated and / or heated with a heating jacket to maintain the hydrolysis temperature. The cycle time of the total enzymatic hydrolysis is 48 hours, 54 hours, 60 hours, 66 hours, 72 hours, 78 hours, 96 hours and 144 hours, and its intervals are within the scope of the present invention. The glucose yields, based on the total cellulose content of the biomass suspension are normally from about 30% to about 90%, from about 40% to about 80% from about 30% to about 70% or from about 60 % to approximately 75% of theoretical value.
For suspensions of very viscous treated biomass, such as those with a viscosity greater than 20,000 cP, approximately 30,000 cP, approximately 50,000 cP, approximately 60,000 cP, approximately 100,000 cP or approximately 400,000 cP, mixing with enzymes can be carried out in two stages. In a first stage, the cellulase can be mixed with the biomass in a mixer particularly suitable for the processing of very viscous materials, for example, a kneader type mixer, a paddle mixer (single or double shaft), or a mixer Tapes (single or double axis). The high viscosity mixers are particularly suitable for the method of the present invention because the vigorous agitation of the cellulase with the viscous suspension of the treated biomass allows a rapid reduction of the viscosity in the subsequent liquefaction stage where the viscosity is reduced preferably at less than about 20,000 cP, less than about 15,000 cP, less than about 10,000 cP or even less than about 5000 cP. The mixer
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High viscosity may optionally have a jacket to receive a cooling or heating medium in order to maintain the temperature of the treated biomass during the addition of cellulase. Optionally, a cooling and heating medium can be incorporated in the components of the internal mixer (such as in the rotation shafts, vanes) to further enhance the heat exchange. In some aspects, the addition of cellulase can be carried out by one or more points of addition, for example, multiple spray nozzles, position close to the input of the treated biomass. In a second stage, the treated biomass-cellulase mixture can be processed in a mixing tank or in a fiber liquefaction bioreactor. In some aspects, the treated biomass-cellulase mixture can be processed in a fiber liquefaction bioreactor to further reduce the viscosity before transfer to a cellulose hydrolysis reactor. The fiber liquefaction bioreactor can be either a continuous mixing design or a design with at least one continuous mixing section and at least one piston flow section. Optionally, two or more fiber liquefaction bioreactors can be operated in series. In some specific aspects, the fiber liquefaction bioreactor comprises alternating mixing zones and proximal piston flow zones and the treated biomass-cellulase mixture flows both down through the tower by gravity or is moved upwards by pumping. The treated biomass-cellulase mixture is normally processed in a fiber liquefaction bioreactor until the viscosity of the mixture is less than about 10,000 cP, less than about 9,000 cP, less than about 8,000 cP, less than about 7,000 cP or less of approximately 5000 cP where it is then transferred to a cellulose hydrolysis reactor.
Optionally, additional enzymes such as a hemicellulase (for example, a xylanase to further hydrolyze the various types of hemicellulose to xylose), an a-amylase (to liquefy the free starch that is previously trapped in the cellulose matrices, hemicellulose and / or lignocellulose), a p-amylase, a glucoamylase (to convert liquefied starch into C6 sugars), an arabinoxylanase, a pululanase, and / or a protease (to hydrolyze peptide bonds and release starch granules embedded in the matrix of proteins) can be added to the treated cellulosic biomass to generate additional C6 sugars and / or pentose sugars ("C5"). Non-limiting examples of C6 sugars include glucose, galactose, mannose, and fructose and non-limiting examples of C5 sugars include xylose, arabinose and ribose. The optional enzymes can be mixed with the cellulosic biomass treated at any time during the hydrolysis including with the cellulase during a high viscosity mixture, in one or more locations of the fiber liquefaction bioreactor and / or in the cellulose hydrolysis reactor .
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A hemicellulase, as used herein, refers to a polypeptide that can catalyze the hydrolysis of hemicellulose in small polysaccharides such as oligosaccharides, or monosaccharides including xylose and arabinose. Hemicellulases include, for example, the following: endoxylanases, p-xylosidases, a-L-arabinofuranosidases, a-D-glucuronidases, feruloyl esterases, coumarolyl esterases, galactosidases,
p-galactosidases, p-mananasas, and p-mannosidases. A xylanase can be obtained from any suitable source, including fungal and bacterial organisms, such as Aspergillus, Disporotrichum, Penicillium, Neurospora, Fusarium, Trichoderma, Humicola, Thermomyces, Myceliophtora, Crysosporium, and Bacillus. Commercially available preparations comprising xylanase include SHEARZYME®, BIOFEED WHEAT®, BIOFEED Plus®L, ULTRAFLO®, VISCOZYME®, PENTOPAN MONO®BG, and PULPZYME®HC (Novozymes A / S), and LAMINEX® and SPEZYME®CP ( Genencor Int.) An example of a hemicellulase suitable for use in the present invention includes VISCOZYME® (available from Novozymes A / S, Denmark).
Generally, any of the classes of proteases, for example, acidic, basic or neutral, are applicable, and proteases of, for example, Novozymes, Genencor and Solvay are commercially available. Examples include, for example, GC106 (available from Genencor International), AFP 2000 (available from Solvay Enzymes, Inc.), FermGen ™ (which is an alkaline protease available from Genencor International), and Alcalase® (which is an acid protease available from Novozymes Corporation). A commercially available pululanase is Promozyme® D2, available from Novozyme Corporation. Commercially available compositions comprising glucoamylase include: AMG 200L, AMG 300 L, AMG E, SAN® SUPER, SAN® EXTRA L, SPIRIZYME® PLUS, SPIRIZYME® FUEL, SPIRIZYME® FG and SPIRIZYME® E (all available from Novozymes); OPTIDEX® 300 and DISTILLASE® L-400 (available from Genencor Int.); and G-ZYME ™ G900, G-ZYME ™ 480 Ethanol and G990 ZR (available from Genencor Int.). Examples of commercial a-amylases of the invention include TERMAMYL® SC, LIQUOZYME® SC DS, LIQUOZYME® SC 4X, and SAN ™ SUPER (all available from Novozymes AJS, Denmark); and DEX-LO®, SPEZYME® FRED, SPEZYME® AA, and SPEZYME® DELTAAA (all available from Genencor).
Also useful are multienzyme complexes containing multiple carbohydrases, such as Viscozyme® L, available from Novozyme Corporation, containing arabanase, cellulase, p-glycanase, hemicellulase, and xylanase.
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In some optional aspects of the present invention, monosaccharides can be extracted or otherwise separated from hydrolyzed biomass. In such aspects, the hydrolyzed biomass is introduced into a sugar recovery apparatus comprising a suitable solid / liquid separation equipment such as, for example, a sieve, filter, centrifuge, settler, percolator, extraction column, container of flotation, or one of its combinations, to generate a liquid fraction comprising monosaccharide sugars and a solid fraction, where the solid fraction may be suitably be in the form of a cake or suspension. The solid fraction can be washed one or more times for the recovery of additional monosaccharides. In some aspects, the monosaccharides can be recovered from the solid fraction by countercurrent contact of the solid fraction with a washing liquid in a suitable apparatus to form a washing current comprising the extracted monosaccharides. The liquid fraction is combined with a liquid medium and / or the wash streams to form a monosaccharide fraction. The precise composition of the liquid medium and the washing liquid are not strictly critical. However, in various preferred aspects of the present invention, the liquid medium and the washing liquid can process water if a relatively high purity fraction is desired. Although the precise composition of the monosaccharide fraction varies with the biomass composition, generally, the monosaccharide compositions comprise at least about 5% by weight, at least about 6% by weight, at least about 7% by weight, at least about 8% by weight, at least about 9% by weight, or at least about 10% by weight of monosaccharides. The residual solids fraction comprises a non-hydrolyzed cellulose, non-hydrolyzed hemicellulose, non-hydrolyzed lignocellulose, polysaccharides (eg, starch granules), entrained monosaccharides and lignin. The residual solids fraction can be recycled properly for the recovery of sugars and sugary substrates.
In some optional aspects of the present invention, the monosaccharide composition may be concentrated to produce a monosaccharide concentrate or syrup having a monosaccharide content of at least about 10% by weight, at least about 15% by weight, at less about 20% by weight, at least about 25% by weight, at least about 30% by weight, at least about 35% by weight or at least about 40% by weight. Concentration methods are known in the art and include evaporators, reverse osmosis and combinations thereof.
Any of various streams of solid biomass treated with enzymes, the streams of
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Suspension can be used with suitable microorganisms as a substrate for the production of fermentation products. A wide variety of fermentation microorganisms is known in the art, and others can be discovered, produced by mutation, or designed by genetic engineering by recombinant means. Fermentation microorganisms within the scope of the present invention include yeasts, bacteria, filamentous fungi, microalgae, and combinations thereof. Examples of fermentation products within the scope of the present invention include, for example, acids, alcohols, alkanes, alkenes, aromatics, aldehydes, ketones, triglycerides, fatty acids, biopolymers, proteins, peptides, amino acids, vitamins, antibiotics, pharmaceuticals. , and their combinations. Non-limiting examples of alcohols include methanol, ethanol, propanol, isopropanol, butanol, ethylene glycol, propanediol, butanediol, glycerol, erythritol, xylitol, sorbitol, and combinations thereof. Non-limiting examples of acids include acetic acid, lactic acid, propionic acid, 3-hydroxypropionic acid, butyric acid, gluconic acid, itaconic acid, citric acid, succinic acid, levulfnic acid, and combinations thereof. Non-limiting examples of amino acids include glutamic acid, aspartic acid, methionine, lysine, glycine, arginine, threonine, phenylalanine, tyrosine, and combinations thereof. Other examples of fermentation products include methane, ethylene, acetone and industrial enzymes.
The fermentation organisms may be natural microorganisms or recombinant microorganisms, and include Escherichia, Zymomonas, Saccharomyces, Candida, Pichia, Streptomyces, Bacillus, Lactobacillus, and Clostridium. In some aspects of the present invention, the fermentation organism is recombinant Escherichia coli, Zymomonas mobilis, Bacillus stearothermophilus, Saccharomyces cerevisiae, Clostridia thermocellum, Thermoanaerobacterium saccharolyticum, or Pichia stipites. In some additional aspects of the present invention, the microorganism is a microalgae, defined as a eukaryotic microbial organism that contains a chloroplast or plastid, and which is optionally capable of carrying out photosynthesis, or a prokaryotic microbial organism capable of carrying out Photosynthesis Microalgae include obligate photoautotrophs, which cannot metabolize a fixed carbon source as energy, as well as heterotrophs, which can only live from a fixed carbon source. Microalgae include single-celled organisms that separate from sister cells that shorten after cell division, such as Chlamydomonas, as well as microbes such as, for example, Volvox, which is a simple multicellular photosynthetic microbe of two different cell types. Microalgae include cells such as Chlorella, Dunaliella, and Prototheca. Microalgae also include other microbial photosynthetic organisms that exhibit cell-cell adhesion, such as Agmenellum, Anabaena, and Pyrobotrys. Micro algae also include microorganisms
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forced photoautotrophs that have lost the ability to carry out photosynthesis, such as in certain species of dinoflagellated algae and Prototheca species.
Non-limiting examples of fermentative organisms and their associated product include the following. The fermentation of carbohydrates to acetone, butanol and ethanol is known by: (i) Solvogenic clostridia as described by Jones and Woods (1986) Microbiol. Rev. 50: 484-524; (ii) a mutant strain of Clostridium acetobutylicum as described in US Patent No. 5,192,673; and (iii) a mutant strain of Clostridium beijerinckii is known as described in US Patent No. 6,358,717. The fermentation of carbohydrates to ethanol by modified strains of E. coli has been described by Underwood et al., (2002) Appl. Environ. Microbiol. 68: 6263-6272 and by a genetically modified strain of Zymomonas mobilis described in US 2003/0162271 A1. The preparation of lactic acid by recombinant strains of E. coli is known (Zhou et al., (2003) Appl. Environ. Microbiol. 69: 399-407), natural strains of Bacillus (US20050250192), and Rhizopus oryzae (Tay and Yang (2002) Biotechnol. Bioeng. 80: 1-12). Recombinant E. coli strains have been used as biocatalysts in fermentation to produce 1,3 propanediol (US Pat. No. 6,013,494 and 6,514,733) and adipic acid (Niu et al., (2002) Biotechnol Prog. 18: 201-211). Acetic acid has been produced using recombinant Clostridia (Cheryan et al., (1997) Adv. Appl. Microbiol. 43: 1-33) and recombinant strains have recently been identified (Freer (2002) World J. Microbiol. Biotechnol. 18: 271-275). The production of succinic acid by recombinant E. coli and other bacteria is described in US Pat. No. 6,159,738 and by recombinant E. coli in Lin et al., (2005) Metab. Eng. 7: 116-127). Pyruvic acid has been produced by mutant Torulopsis glabrata yeast (Li et al., (2001) Appl. Microbiol. Technol. 55: 680-685) and by mutant E. coli (Yokota et al., (1994) Biosci. Biotech Biochem. 58: 2164-2167). Recombinant strains of E. coli have been used for the production of parahydroxycinnamic acid (US20030170834) and chemical acid (US20060003429).
The production of amino acids by fermentation has been carried out using auxotrophic strains and analog resistant strains of amino acids from Corynebacterium, Brevibacterium, and Serratia. For example, histidine production using a strain resistant to a histidine analog is described in Japanese Patent Publication No. 8596/81 and it is described to use a recombinant strain in EP 136359. Production of tryptophan using a strain resistant to a tryptophan analogue in Japanese patent publications Nos 4505/72 and 1937/76. The production of
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isoleucine using a strain resistant to an isoleucine analog in Japanese patent publications Nos. 38995/72, 6237/76, 32070/79. The production of phenylalanine is described using a strain resistant to a phenylalanine analog in Japanese Patent Publication No. 10035/81. Tyrosine production has been described using a strain that requires tyrosine-resistant phenylalanine for growth (Agr. Chem. Soc. Japan 50 (1) R79-R87 (1976)), or a recombinant strain (EP263515, EP332234), and the production of arginine using a strain resistant to an analogue of L-arginine (Agr. Biol. Chem. (1972) 36: 1675-1684, Japanese patent publications Nos 37235/79 and 150381/82). phenylalanine by Eschericia coli strains ATCC 31882, 31883, and 31884. The production of glutamic acid in a recombinant Coryneform bacterium is described in US Patent No. 6,962,805. The production of threonine by a strain is described. E. coli mutant in Okamoto and Ikeda (2000) J. Biosci Bioeng. 89: 87-79. Methionine has been produced by a mutant strain of Corynebacterium lilium (Kumar et al, (2005) Bioresour. Technol. 96: 287- 294) The production of peptides, enzymes, and other proteins by microorganisms is also known. We are described in US Patent Nos. 6,861,237, 6,777,207 and 6,228,630. The production of triglycerides, fatty acids and esters of fatty acids (for example, biodiesel) by microalgae is also known as described in U.S. Patent Nos. 7,883,882, 8,187,860, 8,278,090 and 8,222,010, and in published U.S. patent applications No. 20100303957, 20110047863 and 20110250658.
The selection of suitable fermentation conditions can be carried out suitably by those skilled in the art based on (i) the identity of the microorganisms or a combination of microorganisms, (ii) the characteristics of the substrate medium for fermentation and ( iii) the associated fermentation product. The fermentation can be aerobic or anaerobic. Single and multistage fermentations are within the scope of the present invention. The fermentation substrate medium may be supplemented with additional nutrients necessary for microbial growth. Supplements may include, for example, yeast extract, vitamins, growth promoters, specific amino acids, phosphate sources, nitrogen sources, chelating agents, salts, and trace elements. The components necessary for the production of a specific product prepared by a specific microorganism, such as an antibiotic to maintain a plasmid or a cofactor necessary in an enzyme catalyzed reaction can also be included. Additional sugars can also be included to increase the total sugar concentration. Adequate fermentation conditions are achieved by adjusting these types of factors for growth and for the production of the product of the target fermentation by a
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microorganism. The fermentation temperature may be any temperature suitable for the growth and production of the nutrients of the present invention, such as from about 20 ° C to about 45 ° C, from about 25 ° C to about 40 ° C, or between about 28 ° C at approximately 32 ° C. The pH of the fermentation can be adjusted or controlled by adding an acid or base to the fermentation mixture. In such cases, when ammonia is used to control the pH, it also conveniently serves as a source of nitrogen. The pH is maintained between about 3.0 to about 8.0, about 3.5 to about 7.0 or about 4.0 to about 6.5. The fermentation mixture can optionally be maintained to have a dissolved oxygen content during the course of the fermentation to maintain cell growth and to maintain a cellular metabolism for nutrient production. The oxygen concentration of the fermentation medium can be controlled using known methods such as by the use of an oxygen electrode. Oxygen can be added to the fermentation medium using methods known in the art such as by agitation and aeration of the medium by agitation, shaking, or use of bubblers. Fermentation can occur after enzymatic hydrolysis or it can occur concurrently with enzymatic hydrolysis by SSF. In some aspects of the present invention, SSF can maintain sugar levels produced by hydrolysis thereby reducing the potential inhibition of the product of hydrolysis enzymes, reducing the availability of sugar for contaminating microorganisms, and improving the conversion of biomass treated to monosaccharides and / or oligosaccharides.
Fermenting organisms of hexose sugar include yeasts. Any variety of yeasts can be used as yeast in the present method. Typical yeasts include any of a variety of commercially available yeasts, such as commercial strains of Saccharomyces cerevisiae. Suitable commercially available strains include ETHANOL RED (available from Red Star / Lesaffre, USA); BioFenn HP and XR (available from North American Bioproducts); FALI (available from Fleischmann's Yeast); SUPERSTART (available from Lallemand); GERT STRy (available from Gert StrandAB, Sweden); FERMIOL (available from DSM Specialties); and Thennosac (available from Alltech). In some aspects, the hexose fermenting organism is a recombinant yeast that has at least one transgene that expresses an enzyme useful for converting mono and / or oligosaccharides into ethanol.
In aspects of the present invention directed to the generation of ethanol by yeasts, the fermentation medium has a pH of about 3.5 to about 6, of
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about 3.5 to about 5 or about 4 to about 4.5. If a pH adjustment is required, mineral acids such as sulfuric acid, hydrochloric acid or metric acid, or bases such as amomac (ammonium hydroxide) or sodium hydroxide can be used. To enhance the efficiency of ethanol fermentation and an increase in ethanol yield, additional nutrients can be added to enhance yeast proliferation. Such nutrients include without limitation, free amino nitrogen (NAL), oxygen, phosphate, sulfate, magnesium, zinc , calcium, and vitamins such as inositol, pantothenic acid, and biotin. Typical sources of NAL include urea, ammonium sulfate, ammonia, amino acids, and a-amino nitrogen groups of peptides and proteins. The added NAL content is preferably from about 1.2 to about 6 mg N / g of starch, for example 1.2, 2.4, 3.6, 4.8 or 6 mg N / g of starch. In the case of urea, it is preferred to add between about 2.4 to about 12 mg of urea per gram of starch, for example, 2.4, 4.8, 7.2, 9.6 or 12 mg of urea per gram of starch Food yeasts that supply, for example, add vitamins (such as vitamins B vitamins and biotin), minerals (such as magnesium and zinc salts and micronutrients and nutrients can be added to the fermentation medium) Food yeasts can include an autolysed yeast and plant extracts and are normally added at a concentration of about 0.01 to about 1 g / l, for example, about 0.05 to about 0.5 g / l .. Bactericides can also be optionally added to the fermentation medium. Examples of typical bactericides include virginiamycin nisin, erythromycin, oleandomycin, fiavomycin, and penicillin G. In the case of virginiamycin, a concentration of about 1 ppm to about 10 ppm is preferred.
Suitable pentose sugar fermentation organisms (eg, xylose) include yeasts. Such yeasts include Pachysolen tannophilus, Pichia stipites, Candida diddensii, Candida utilis, Candida tropicalis, Candida subtropicalis, Saccharomyces diastaticus, Saccharomycopsis fibuligera and Torula candida. In some aspects, the pentose fermenting organism is a recombinant yeast that has at least one transgene that expresses an enzyme useful for converting mono and / or oligosaccharides into ethanol. For example, the genome of P. stipites can be incorporated into S. cerevisiae by a method of gene redistribution to produce a hydrochloric yeast capable of producing bioethanol from xylose while retaining the ability to survive in high concentrations of ethanol.
In some aspects of the present invention, organisms capable of fermenting both hexose and pentose sugars are used to convert monosaccharides into ethanol. Typically,
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Such organisms are strains of S. cerevisiae that have transgenes encoding one or more enzymes capable of converting pentose sugars to ethanol.
In aspects of the present invention where the fermentation medium comprises cellulosic biomass treated with enzymes comprising non-hydrolyzed cellulosic material such as cellulose, hemicellulose, lignocellulose, and fragments thereof, the source of the fermentation organism may optionally comprise at least one species cellulolytic organism capable of breaking and metabolizing the non-hydrolyzed cellulose, hemicellulose and / or lignocellulose present in the ethanol fermentation medium. Such cellulolytic organisms are known in the art and include Escherichia coli, Zymomonas mobilis, Bacillus stearothermophilus, Saccharomyces cerevisiae, Clostridia thermocellum, Thermoanaerobacterium saccharolyticum, Pichia stipites and Pachysolen tannophilus. Also within the scope of the present invention are cellulolytic bacteria that have one or more transgenes encoding the ethanol producing route. In some different aspects of the present invention, the source of the fermentation organism also comprises at least one species of cellulolytic organism capable of breaking the non-hydrolyzed hemicellulose present in the combined liquefaction mixture adjusted and capable of synthesizing ethanol.
Fermentation products can be recovered using any of several methods known in the art. For example, the fermentation products can be separated from other fermentation components by distillation (for example, azeotropic distillation liquid-liquid extraction, solid-liquid extraction, adsorption, gas entrainment, membrane evaporation, pervaporation, centrifugation, crystallization , filtration, microfiltration, nanofiltration, ion exchange, or electrodialysis.As a specific example, methanol, ethanol, or other fermentation products that have sufficient volatility can be recovered from a fermentation mixture by distillation.In another example, 1- butanol of a fermentation mixture using methods known in the art for the fermentation of acetone-butanol-ethanol ("ABE") (see for example, Durre, Appl. Microbiol. Biotechnol. 49: 639-648 (1998), Groot et al., Method. Biochem. 27: 61-75 (1992), and references cited therein), for example, by removing solids followed by medium isolation Distillation, liquid-liquid extraction, adsorption, gas entrainment, membrane evaporation, or pervaporation. In yet another example, 1,3-propanediol can be isolated from a fermentation mixture by extraction with an organic solvent, distillation, and column chromatography (see U.S. Patent No. 5,356,812). In yet another example, amino acids can be collected from the fermentation mixture by methods such as adsorption by ion exchange resin and / or crystallization. A person skilled in the art can
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carry out the selection of a suitable separation method for any specific fermentation product.
In accordance with the present invention, any of the rich organic fractions such as clean bio-wastes, insoluble insulated biomass, CDR and / or CSR, can be converted to the secondary product by gasification methods by gasification methods or synthesis gas fermentation methods Gas known in the art. In gasification methods, the rich organic fraction is heated at high temperature in an atmosphere with oxygen supply or in the essential absence of oxygen to produce synthesis gas (mainly hydrogen and carbon monoxide) which is subsequently reacted to form a stream of gas comprising one or more carbon compounds. For example, in a step of synthesis of Fischer-Tropsch ("FT"), H2 and CO in synthesis gas are reacted on a catalyst (for example, iron or cobalt) to form a wide range of various hydrocarbon chains lengths The FT reaction is normally carried out at a pressure of about 20 bar to about 40 bar in a temperature range from both about 200 ° C to about 250 ° C or from about 300 ° C to about 350 ° C. Iron catalysts in the upper temperature range are generally used to produce olefins for a lighter gasoline product and cobalt catalysts at a lower temperature range to produce longer chains that can be cracked up to diesel. The production of methanol from synthesis gas normally involves reacting CO, H2 and a small amount of CO2 on a zinc-copper oxide catalyst where the reaction takes place via reaction by displacement with water followed by the hydrogenation of CO2. The process is usually carried out at a pressure of about 50 to about 100 bar (10 MPa) and in a temperature range of about 220 ° C to about 300 ° C. The synthesis of mixed alcohols from synthesis gas is similar to both FT synthesis and methanol synthesis using modified catalysts from those methods with alkali metal addition to promote the mixed alcoholic reaction, where the molar ratio of H2 to CO is from about 1: 1 to about 1.2: 1.
In the methods of fermentation of synthesis gas, a variety of microorganisms can use synthesis gas as a source of energy and carbon to produce fermentation products such as ethanol, butanol, acetate, formate and butyrate. Such organisms include Acetobacterium woodii, Butyribacterium methylotrophicum, Clostridium
Carboxidivorans P7, Eubacterium limosu, Moorella and Peptostreptococcus productus. For example, certain anaerobic microorganisms can produce ethanol and others
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Useful CO products by fermentation. For example: US Pat. No. 5,173,429 describes Clostridium ljungdahlii ATCC No. 49587, an anaerobic microorganism that produces ethanol from synthesis gas; U.S. Patent No. 5,807,722 describes a method and apparatus for converting the synthesis gas into organic acids and alcohols using Clostridium ljungdahlii ATCC No. 55380; U.S. Patent No. 6,136,577 describes a method and an apparatus for converting synthesis gas into ethanol using Clostridium ljungdahlii ATCC No. 55988 and 55989; The US publication No. 20070275447 describes a bacterial species of Clostridium (Clostridium carboxidivorans, ATCC BAA-624, "P7") that can synthesize biofuels from synthesis gas; and the US patent. No. 7,704,723 describes a bacterial species of Clostridium (Clostridium ragsdalei, ATCC BAA-622, "P11") that can synthesize biofuels from waste gases. US Publication 20140120591 describes a species of Clostridium tyrobutyricum acidogenica (ITRI04001) that can synthesize volatile fatty acids (for example, formic acid, acetic acid, lactic acid, propanoic acid, butric acid, and mixtures thereof) from synthesis gas. The fermentation conditions are usually atmospheric pressure at 2 bar (200 kPa), and at a temperature range of about 15 ° C to about 55 ° C, with the selection of specific conditions of the fermenter and pH dependent on the fermenting microorganism.
When elements of the present invention or aspect (s) or embodiment (s) thereof are introduced, the articles "a", "one", "the" and "said" are understood as meaning that there is one or more of The elements. The terms "comprises", "includes" and "has" are intended to be inclusive and means that there may be additional elements to the related elements.
This written specification uses examples to disseminate the invention, including the best mode, and also allows any person skilled in the art to practice the invention, including the preparation and use of any devices or systems and to carry out any methods. incorporated. The patentable scope of the invention is defined by the claims, and may include other examples that occur to the person skilled in the art. These other examples are intended to be within the scope of the claims if they have elements that do not differ from the literal language of the claims, or if they include equivalent elements with minor differences from the literal language of the claims.

权利要求:
Claims (27)
[1]
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1. A method for preparing a clean bio-waste stream from a raw bio-waste stream comprising cellulose, inorganic compounds, and a mixture of plastics, the method comprising:
(a) classify the raw bio-waste stream in a first classification stage to form (1) a first through rejection current that has an average particle size smaller than 6 mm to 15 mm and that is enriched in inorganic compounds by comparison with the raw bio-waste stream and (2) a first sinking stream enriched in bio-waste compared to the raw bio-waste stream, in which the through stream comprises at least 50 percent by weight of inorganic compounds;
(b) classifying the first sinking current in a second classification stage to form a second rejection current and an intermediate bio-waste current, in which the second rejection current has a higher density in grams per cm3 compared to the current of intermediate bio-waste and the second rejection stream is enriched in inorganic compounds compared to the intermediate bio-waste stream;
(c) classifying the crude bio-waste stream in a third classification stage to form a second sinking current and a second through current, in which the second sinking current is enriched in plastic compared to the intermediate bio-waste current and in which the second through current has an average particle size of less than 50 mm to 70 mm and is enriched in bio-waste compared to the intermediate bio-waste stream;
(d) classifying the second sinking stream into a fourth sorting stage to form a stream of plastic material enriched in recyclable plastic components compared to the second sinking stream and a stream of thick bio-waste enriched in bio-waste compared to the second sinking current; Y
(e) combine the thick bio-waste stream with the second through current to form the clean bio-waste stream.
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[2]
2. The method of claim 1 wherein the first stage of classification is a stage of fractionation by screening using a first screen having openings of 6 mm to 15 mm or 8 mm to 12 mm, the second stage of classification is a density separation stage, the third stage of classification is a stage of fractionation by screening using a second screen having openings of 50 mm to 70 mm or 55 mm to 65 mm, and the fourth stage of classification is a stage by optical classification.
[3]
3. The method of claim 2 further comprising (a) classifying the clean bio-waste stream through a third screen having openings of 20 mm to 30 mm to form a clean bio-waste through stream and a bio-waste sinking stream clean, (b) grind the clean bio-waste sinking stream to achieve an average particle size of about 15 mm to about 30 mm and combine the clean ground bio-waste sinking stream with the clean bio-waste through stream.
[4]
4. The method of claim 2 or claim 3 wherein the first, second and third screens, each of them, are integrated into a rotating barrel.
[5]
5. The method of any one of claims 2 to 4 wherein at least one of the first screen, the second screen, or the third screen has a square opening configuration.
[6]
6. The method of any one of claims 1 to 5 wherein the crude bio-waste stream is a classified fraction of urban solid waste.
[7]
7. A method for preparing a clean bio-waste stream from a raw bio-waste stream comprising cellulose, inorganic compounds, and a mixture of plastics, the method comprising:
(a) classify the raw bio-waste stream in a first classification stage to form (1) a first through current that has an average particle size of less than about 25 mm to 50 mm and that is enriched in inorganic compounds as compared to the raw bio-waste stream and (2) a first sinking stream enriched in bio-waste compounds compared to the raw bio-waste stream;
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(b) classify the first through current in a second classification stage to form (1) a first through rejection current that has an average particle size of less than 6 mm to 15 mm and that is enriched in inorganic compounds compared to the first through current and (2) a second sinking current enriched in bio-waste compared to the first through current, in which the first through rejection current comprises at least 50 percent by weight of inorganic compounds;
(c) classifying the first sinking current in a third classification stage to form (1) a first stream of plastic material enriched in plastic material compared to the combination of the first sinking current and the second sinking current, in the that the objects of the first stream of plastic material have an average particle size of 25 mm to 80 mm, (2) a rejection stream enriched in inorganic compounds as compared to the combination of the first sinking stream and the second stream of sunk, and (3) a first stream of clean bio-waste enriched in bio-waste compared to the combination of the first sink current and the second sink current, in which the objects contained therein have an average particle size smaller than 50 mm;
(d) classifying the first stream of plastic material in a fourth classification stage to form a second stream of plastic material enriched in recyclable plastic components compared to the first stream of plastic material and a second stream of clean bio-waste enriched in bio-waste in comparison with the first stream of plastic material; Y
(e) combine the first clean bio-waste stream and the second clean bio-waste stream to form the clean bio-waste stream.
[8]
8. The method of claim 7 wherein the first stage of classification is a stage of fractionation by screening using a first screen having openings of 25 mm to 50 mm or 8 mm to 12 mm, the second stage of classification is a fractionation stage by screening using a second screen having openings from 6 mm to 15 m or from 8 mm to 12 mm, the third classification stage is an X-ray separation stage, and the fourth classification stage is a stage by optical classification.
[9]
9. The method of claim 8 in which the first and second screens, each of them, are integrated into a rotating barrel.
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[10]
10. The method of claim 8 or claim 9 wherein at least one of the first screen or the second has square openings.
[11]
11. The method of any one of claims 7 to 10 wherein (a) the first clean bio-waste stream is further classified in the fourth classification stage to form two streams enriched in bio-waste from the previous one, wherein The objects contained in said first bio-waste stream have an average particle size of less than 25 mm, and in which the objects contained in said second bio-waste stream have an average particle size of 25 mm to 50 mm, (b) grind said second bio-waste stream enriched in bio-waste to achieve an average particle size of about 15 mm to about 30 mm, and (3) combining said first bio-waste stream, said second ground bio-waste stream and the second clean bio-waste stream to form The bio-waste stream is clean.
[12]
12. The method of any one of claims 7 to 11, further comprising grinding the second clean bio-waste stream to achieve an average particle size of about 15 mm to about 30 mm and combining said ground stream with the first clean bio-waste stream .
[13]
13. The method of any one of claims 7 to 12 wherein the crude bio-waste stream is a classified fraction of urban solid waste.
[14]
14. An apparatus for preparing a clean bio-waste stream from a raw bio-waste stream comprising cellulose, inorganic compounds, and a mixture of plastics, the apparatus comprising:
(a) a first screening screen having openings of 6 mm to 15 mm to receive and classify the raw bio-waste stream to form (1) a first through rejection stream enriched in inorganic compounds as compared to the bio-waste stream in crude and (2) a first sinking stream enriched in bio-waste compared to the raw bio-waste stream, in which the through stream comprises at least 50 percent by weight of inorganic compounds;
(b) a density separator to receive and classify the first sink current to form a second rejection current and an intermediate bio-waste stream in which
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the second rejection stream has a higher density in grams per cm3 compared to the intermediate bio-waste stream and the second rejection stream is enriched in inorganic compounds compared to the intermediate bio-waste stream;
(c) a second sorting screen having an opening size of about 50 mm to about 70 mm to receive and classify the intermediate bio-waste stream to form a second sinking stream and a second through stream, in which the second stream sinking is enriched in plastic compared to the intermediate bio-waste stream and the second through current is enriched in bio-waste compared to the intermediate bio-waste stream;
(d) an optical classifier to receive and classify the second sinking current to form a first optical classification current enriched in recyclable plastic components compared to the second sinking current and a second optical classification current enriched in bio-waste compared to the second sinking current; Y
(e) in which the second optical classification current and the second through current combine to form the clean bio-waste stream.
[15]
15. The apparatus of claim 14 further comprising:
(a) a third sorting screen having openings of 20 mm to 30 mm to receive and classify the clean bio-waste stream to form a clean bio-waste through stream and a clean bio-waste sink current; Y
(b) a mill to receive and grind the clean biowaste sinking stream to achieve an average particle size of about 15 mm to about 30 mm,
in which the ground of clean ground biorresiduos sinking is combined with the through current of clean bio-waste.
[16]
16. The apparatus of claim 14 or claim 15 wherein the first screen has openings of about 8 mm to about 12 mm.
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[17]
17. The apparatus of any one of claims 14 to 16 wherein the second screen has openings of 55 mm to 65 mm.
[18]
18. The apparatus of any one of claims 14 to 17, wherein the first, second and third screens, each of them, are integrated into a rotating barrel.
[19]
19. The apparatus of any one of claims 14 to 18 wherein at least one of the first screen, the second screen, or the third screen has square openings.
[20]
20. The apparatus of any one of claims 14 to 19 wherein the crude bio-waste stream is a classified fraction of urban solid waste.
[21]
21. An apparatus for preparing a clean bio-waste stream from a raw bio-waste stream comprising cellulose, inorganic compounds, and a mixture of plastics, the apparatus comprising:
(a) a first screening screen having openings of approximately 25 mm to approximately 50 mm to receive and classify the raw bio-waste stream to form (1) a first through current enriched in inorganic compounds as compared to the bio-waste stream in raw and (2) a first sinking stream enriched in bio-waste compounds as compared to the raw bio-waste stream;
(b) a second screening screen having openings of 6 mm to 15 mm to receive and classify the first through current to form (1) a second through rejection current enriched in inorganic compounds compared to the first through current and (2 ) a second sinking stream enriched in bio-wastes compared to the first through stream, wherein the second through stream comprises at least 50 percent by weight of inorganic compounds;
(c) an X-ray separator to receive and classify the first sinking current to form (1) a first X-ray separation current enriched in plastic material compared to the combination of the first sinking current and the second current of sunk, in which the objects of the X-ray separation stream have an average particle size of 25 mm to 80 mm, (2) a second X-ray separation stream enriched in inorganic compounds compared to the combination of the first sinking current and the second sinking current, and (3) a
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Clean bio-waste stream comprising at least one X-ray separation stream enriched in bio-waste compared to the combination of the first sinking current and a second sinking current, in which the objects contained therein have an average size of particle less than 50 mm; Y
(d) an optical classifier to receive and classify the first X-ray separation current to form a first optical classification current enriched in recyclable plastic components compared to the second sinking current and a second optical classification current enriched in bio-waste in comparison with the second sinking current; Y
wherein the at least one stream of X-ray separation enriched in bio-waste and the second stream of optical classification enriched in bio-waste are combined to form the clean stream of bio-waste.
[22]
22. The apparatus of claim 21 wherein the second screen has openings of about 8 mm to about 12 mm.
[23]
23. The apparatus of claim 21 or claim 22 wherein the first and second screens, each of them, are integrated into a rotating barrel.
[24]
24. The apparatus of any one of claims 21 to 23 wherein at least one of the first screen or the second screen has square openings.
[25]
25. The apparatus of any one of claims 21 to 24 further comprising
(a) form two X-ray separation streams enriched in bio-waste, in which the objects contained in the first bio-waste stream have an average particle size smaller than 25 mm, and in which the objects contained in said second stream have an average particle size of 25 mm to 50 mm; Y
(b) a mill to receive and grind the second stream enriched in bio-waste to achieve an average particle size of about 15 mm to about 30 mm,
wherein the first stream enriched in bio-waste is combined with the second ground stream enriched in bio-waste to form the clean bio-waste stream.
[26]
26. The apparatus of any one of claims 21 to 25 further comprising a mill for receiving and milling the optical sorting stream enriched in bio-waste to achieve an average particle size of approximately 15 mm at
5 approximately 30 mm and combine said ground stream with the clean bio-waste stream.
[27]
27. The apparatus of any one of claims 21 to 26 wherein the crude bio-waste stream is a classified fraction of urban solid waste.

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WO2016050860A1|2016-04-07|

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US20180229273A1|2018-08-16|

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ES201431440A|ES2565553B1|2014-09-30|2014-09-30|SYSTEMS AND METHODS TO FORM CELLULAR BIORRESIDUES FROM CRUDE BIORRESIDUO|ES201431440A| ES2565553B1|2014-09-30|2014-09-30|SYSTEMS AND METHODS TO FORM CELLULAR BIORRESIDUES FROM CRUDE BIORRESIDUO|

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PCT/EP2015/072593| WO2016050860A1|2014-09-30|2015-09-30|Systems and methods for forming cleaned biowaste from crude biowaste|

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CA2963029A| CA2963029A1|2014-09-30|2015-09-30|Systems and methods for forming cleaned biowaste from crude biowaste|

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US15/515,451| US20180229273A1|2014-09-30|2015-09-30|Systems and methods for forming cellulosic biowaste from crude biowaste|

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EP15781043.3A| EP3200933A1|2014-09-30|2015-09-30|Systems and methods for forming cleaned biowaste from crude biowaste|