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    • 专利摘要:
    PURPOSE: Advanced sewage and wastewater treatment system and method using membrane and bacillus spp. are provided to improve treatment efficiency of organic matter, nitrogen and phosphorus by preventing formation of spores in reaction tank, thereby increasing growth rate of bacillus spp. CONSTITUTION: The advanced sewage and wastewater treatment system using membrane and bacillus spp. comprises a pretreatment facility(1) for removing miscellaneous materials, particulate and non-corrosive inorganic materials contained in wastewater flown in; a flow balancing tank(3) for storing influent flown in from the pretreatment facility and controlling flux of effluent discharged to first chamber of the reaction tank; and a reaction tank(5) divided into a plurality of chambers to remove organic matter, nitrogen and phosphorus contained in sewage and wastewater and solid-liquid separate sludge and treated water from a mixed solution of the sewage and wastewater containing organic matter, nitrogen and phosphorus by culturing high concentrated bacillus spp., wherein the reaction tank is divided into four chambers, air injection units(2) are respectively installed in the first to third chambers, a return pipe(4) is installed in the third chamber to return some of the mixed solution to the flow balancing tank and the first chamber, a submerged membrane(7) is installed in the fourth chamber to solid-liquid separate the mixed solution, an air cleaner(6) is installed in the fourth chamber to prevent clogging of the submerged membrane, and the submerged membrane is preferably a hollow fiber membrane module of suction filtration type.
    公开号:KR20040072392A
    申请号:KR1020030008862
    申请日:2003-02-12
    公开日:2004-08-18
    发明作者:강원중；김정훈；권용웅
    申请人:현대엔지니어링 주식회사；주식회사 대경엔텍；
    IPC主号:
    专利说明:

    System and Method for wastewater treatment using membrane and Bacillus sp.
    [4] The present invention relates to an advanced sewage and wastewater treatment apparatus for treating sewage, manure, livestock wastewater and organic industrial wastewater, and a method thereof, and more particularly, to divide the reactor into which wastewater is introduced into four chambers. In the first to third chambers, air is injected in a tapered aeration method to dominantly culture Bacillus bacteria and at the same time, a certain amount of the mixed liquid of the third chamber is transferred to the first chamber and the Bacillus cells in the reaction chamber are carried out. By maintaining high concentration of organic matter, nitrogen and phosphorus contained in the wastewater, wastewater, and in the fourth chamber of the reaction tank to install an immersion type separation membrane to increase the treatment efficiency by separating the mixed liquid into sludge and treated water, and to maintain the facility cost And it relates to a high sewage and wastewater treatment apparatus and method using a membrane and Bacillus bacteria to reduce the required site.
    [5] Generally, wastewater treatment facilities used in Korea are based on activated sludge method developed for organic matter removal, so the efficiency of treating nutrients such as nitrogen and phosphorus is very low. Therefore, the nutrients of nitrogen and phosphorus, which are excessively released into the natural world, cause eutrophic lakes and red tide in lakes and coastal areas, causing enormous damage to the natural environment and human life. Accordingly, advanced treatment technologies such as A / O, A 2 / O, Bardenpho, VIP, uct, and SBR have been developed to remove nutrients contained in sewage and wastewater.
    [6] These processes are mainly for nitrifying nitrogen, then degassing in an anoxic state to remove nitrogen, increasing the release of phosphorus in an anaerobic state, and then removing the phosphorus by excessive ingestion of phosphorus in an aerobic state. However, these methods inject a large amount of air to nitrify ammonia nitrogen and return it to a reactor that maintains anaerobic conditions for denitrification. Therefore, organic materials decay in anaerobic reactors, causing odor or oxidizing ammonia nitrogen. It takes a lot of energy and costs a lot of maintenance costs, it is not sensitive to water temperature and water quality fluctuations, and it is not possible to obtain stable water quality.It requires a lot of facility cost because it requires 10 to 20 times dilution water after anaerobic digestion or aerobic digestion. There was a problem in that the process was complicated and a high level of driving skills had to be acquired.
    [7] In consideration of this, recently, Bacillus sp., A Gram-positive anaerobic bacterium that produces endogenous spores in an unsuitable growth environment, is predominantly cultured, and organic matter contained in sewage and wastewater. Advanced wastewater treatment technology using Bacillus bacteria to remove nitrogen and phosphorus has been developed. In other words, abandoning the reaction tank composed of a plurality of yarns in a tapered aeration method (a method of gradually reducing the amount of air injected), finally forming an anoxic state, and returning the spores Bacillus spores in the anoxic state back to the reactor → By repeating the life cycle of the cells → spores, it maintains more than a certain number of cells in the reactor to remove organic matter, nitrogen and phosphorus contained in the waste water.
    [8] In addition, because Bacillus spores and releases antibiotics and adhesive substances, if the sedimentation tank is formed in anaerobic state, it kills Escherichia coli and common bacteria by antibiotics, Floating material is attached to form flocs, so the sludge and the treated water are easily solidified and separated through gravity settler.
    [9] For example, the wastewater treatment apparatus and method using the Bacillus bacterium according to the prior art, as schematically shown in Figure 1, the reaction vessel 15 is divided into three chambers, the first chamber is dissolved oxygen of 0.5 ~ 1.0 mg / l, and the second chamber keeps dissolved oxygen below 0.1mg / l, and the third chamber does not inject air at all and prevents precipitation while allowing dissolved oxygen to be 0 mg / l to completely eliminate Bacillus bacteria. After sporing, part of the sludge in the sedimentation basin 17 is returned to the reaction tank 15 so that Bacillus bacteria ingest nitrogen and phosphorus while repeating the process of spores → germination → nutritional cells → spores.
    [10] In other words, Bacillus bacteria are grown at a maximum amount of dissolved oxygen of 1.0 mg / l, and the intake of organic substances and nitrogen is maximized, and phosphorus intake is maximized at a dissolved oxygen level of 0.5 mg / l. Therefore, in the first chamber, dissolved oxygen is maintained at 0.5 to 1.0 mg / l to remove organic substances, nitrogen and phosphorus. Bacillus bacteria, on the other hand, form endogenous spores when the amount of dissolved oxygen falls below 0.1 mg / l. Therefore, the amount of dissolved oxygen in the second and third chambers is kept below 0.1 mg / l to kill all aerobic bacteria, and the Bacillus bacteria are dominantly cultured by returning the spores of Bacillus to the first chamber of the reactor with good growth conditions. can do.
    [11] However, the high and low wastewater treatment apparatus and method using Bacillus bacteria according to the prior art described above are formed in the third chamber and the settling tank of the reaction tank in an oxygen-free state to completely spore Bacillus bacteria, and then, these sporulated Bacillus bacteria Since it is to be returned to the first chamber of (15), it is difficult to maintain high concentrations of Bacillus cells in the first chamber because the spores take time to germinate into the cells in the first chamber of the reactor, and the germination rate of the spores also decreases. . That is, since most of the organic matter, nitrogen and phosphorus contained in the waste water and waste water are decomposed in the first chamber of the reactor, when the high concentration of Bacillus cells cannot be maintained in the first chamber of the reactor, the treatment efficiency of the entire system is lowered.
    [12] In order to solve this problem, Korean Patent Laid-Open No. 2002-0048913 expands the reaction tank to four chambers and returns Bacillus spores to the first chamber from the fourth chamber, which is anoxic, or shortens the residence time in the settling tank. A method of reducing the rate of progression of the spores or the thickness of the outer shells forming the spores has been proposed, and Korean Patent Laid-Open No. 2002-0095946 discloses a separate method for promoting early germination and cell division of Bacillus. The technology for injecting the microbial activator of has been developed. However, these conventional techniques are merely for promoting the germination of spores, and since the method of dominant culture is repeated while repeating the process of spores → germination → nutritional cells → spores, the conventional problems cannot be fundamentally solved.
    [13] Accordingly, the present invention is to solve the problems of the prior art, the main object of the present invention, unlike the conventional method of dominant culture while repeating the process of spores → germination → nutrient cells → spores, so that spores are not formed in the reaction tank By increasing the growth rate of Bacillus bacteria to increase the concentration of Bacillus cells in the first chamber of the reactor to improve the treatment efficiency of organic matter, nitrogen and phosphorus, to provide an advanced wastewater treatment apparatus and method.
    [14] In the present invention, the reaction chamber divided into a plurality of yarns is tapered and the Bacillus bacteria are dominantly cultured by introducing a specially prepared microbial active agent including silica, calcium, magnesium, sulfur, etc. to promote microbial growth in the first chamber. Injecting air to prevent the formation of conditions and conveying Bacillus bacteria in the form of simple bacilli, increasing the growth rate of Bacillus bacteria and maintaining high concentrations of Bacillus cells in the reaction tank to improve the treatment efficiency of organic matter, nitrogen and phosphorus. It is to provide a processing apparatus and method.
    [15] In addition, another object of the present invention is to provide an advanced sewage and wastewater treatment apparatus that does not require a separate sedimentation tank and disinfection tank by installing an immersion type hollow fiber membrane separation membrane in the final chamber of the reaction tank so as to easily separate the spores Bacillus bacteria, liquid will be.
    [1] 1 is a schematic process diagram showing a wastewater advanced wastewater treatment apparatus and method using Bacillus bacteria according to the prior art,
    [2] Figure 2 is a schematic process diagram showing the sewage and wastewater advanced treatment apparatus and method using a separation membrane and Bacillus according to the present invention,
    [3] Figure 3 is a schematic flow chart showing the wastewater, advanced wastewater treatment method using a membrane and Bacillus according to the present invention.
    [16] In order to achieve the above object, the present invention, the wastewater advanced wastewater treatment apparatus comprising a pretreatment facility, a flow rate adjustment tank and a reaction tank in which Bacillus bacteria are predominantly cultured, the reaction tank is divided into four chambers, In the first to third chambers, the Bacillus bacteria are predominantly cultured in a tapered aeration method, and an appropriate amount of air is injected to prevent an anaerobic condition.In the third chamber, Bacillus bacteria in the form of single bacilli are returned to the first chamber. The four chambers are provided with an advanced sewage and wastewater treatment system using a separation membrane and Bacillus bacteria, characterized in that the immersion type separation membrane is installed and the mixed liquid is separated into sludge and treated water.
    [17] The present invention also provides an advanced wastewater and wastewater treatment method for treating organic matter, nitrogen and phosphorus contained in wastewater and wastewater by using a device including a pretreatment facility, a flow regulating tank, and a reactor divided into a plurality of chambers. A pretreatment step of removing the contained impurities and the like; Adjusting the flow rate of the inflow water flowing into the first chamber of the reactor and mixing the Bacillus bacterium in the form of simple bacilli returned from the third chamber of the reactor to remove odor generated in the process; The Bacillus bacteria are dominantly cultured in a tapered aerobic method that reduces the amount of dissolved oxygen from the first chamber to the third chamber of the reactor, but the organic matter, nitrogen and phosphorus contained in the manure, livestock wastewater and organic industrial wastewater are prevented. Aerobic decomposition step of removing; An internal conveyance step of conveying Bacillus bacteria in the form of monobacterium from the third chamber of the reactor to the first chamber; And a membrane separation step of separating the mixed liquid into sludge and treated water using the immersion type separation membrane installed in the fourth chamber of the reactor.
    [18] Hereinafter, the wastewater advanced wastewater treatment apparatus using the separator and the Bacillus bacterium according to the present invention will be described in detail with reference to the accompanying drawings. Figure 2 is a schematic process diagram showing the wastewater, advanced wastewater treatment apparatus using a separator and Bacillus bacteria according to the present invention. Various detailed devices are omitted in this schematic process diagram. However, since these can be easily predicted and understood by those of ordinary skill in the art or may be practiced in the drawings, only those parts related to the present invention are illustrated.
    [19] As shown, the sewage and wastewater advanced treatment apparatus according to the present invention includes a pretreatment system 1 for largely removing contaminants, particulates, non-corrosive inorganic substances, etc. contained in the influent wastewater, and the inflow from the pretreatment system 1. The flow control tank (3) for storing the influent water and adjusting the flow rate of the outflow water flowing into the first chamber of the reaction tank (5), and the high concentration of Bacillus bacteria to cultivate the organic matter, nitrogen and phosphorus in the sewage, wastewater and It consists of the reaction tank 5 comprised by the several chamber so that sludge and process water may be separated from the mixed liquid, and liquid may be separated.
    [20] That is, one embodiment of the reactor (5) according to the present invention is divided into four chambers, the first to third chambers are each provided with an air injection device 2 for injecting air, the third In the chamber, a conveying pipe 4 for conveying a part of the mixed liquid to the flow rate adjusting tank 3 and the first chamber is provided, and an immersion type separation membrane 7 is provided in the fourth chamber for collecting and separating the liquid mixture. . The fourth chamber is provided with an air cleaning device 6 for preventing clogging of the immersion type separation membrane 7. At this time, the submerged membrane 7 is preferably a hollow fiber membrane module of the suction filtration method.
    [21] Next, the wastewater advanced treatment method using the separation membrane and Bacillus bacteria according to the present invention. Figure 3 is a schematic flow chart showing the wastewater, advanced wastewater treatment method using a membrane and Bacillus bacteria according to the present invention. As shown, the method of the present invention is largely composed of a pretreatment step, a flow control step, aerobic decomposition step, the inner conveying step and the membrane separation step. The pretreatment step is to remove the contaminants, particulates or non-corrosive inorganic substances contained in the incoming sewage water using a settlement and a fine screen, the flow rate control step is to adjust the flow rate of the influent water flowing into the first chamber of the reactor And, by mixing the Bacillus bacteria in the form of a simple bacillus transported internally from the third chamber of the reaction tank to remove the odor generated in the process is not significantly different from the prior art.
    [22] On the other hand, the aerobic decomposition step is significantly different from the prior art in that the amount of dissolved oxygen decreases from the first chamber to the third chamber so as to dominate the Bacillus bacteria but not adjust the anaerobic condition. That is, the first chamber of the reactor maintains dissolved oxygen at 0.5-1.5 mg / l to improve the growth conditions of Bacillus bacteria, so as to absorb organic matter, nitrogen and phosphorus contained in the wastewater and synthesize nutrient cells. The amount of dissolved oxygen in the second chamber is maintained at 0.3 to 0.5 mg / l, while the third chamber is maintained at 0.3 mg / l or less to kill most of the aerobic bacteria, so that the dissolved oxygen does not go below 0.1 mg / l in any chamber. This prevents Bacillus from forming spores. As described above, the aerobic decomposition step according to the present invention may prevent the organic matter from decaying or releasing phosphorus because the anaerobic state is not formed.
    [23] In addition, the internal transport step is a step of returning the Bacillus bacteria in the form of a single bacilli from the third chamber of the reaction tank to the first chamber or the flow rate reaction tank. That is, in the first chamber of the reactor, the MLSS concentration is preferably maintained at 7,000 to 9,000 mg / l for sewage, and 10,000 to 25,000 mg / l for manure, livestock wastewater and organic industrial wastewater. Therefore, from the third room, 100 to 200% for sewage, 300 to 500% for manure, livestock waste and organic industrial waste water are returned internally. In addition, the present invention transfers the bacillus bacterium in the form of monobacterium before the spores are formed into the first chamber of the reaction tank, thereby increasing the growth rate of Bacillus bacteria by reducing the time taken for the spores to germinate, thereby increasing the concentration of Bacillus cells in the first chamber of the reactor. By increasing the treatment efficiency of organic matter, nitrogen and phosphorus can be improved.
    [24] Subsequently, in the membrane separation step, the mixed solution is separated into sludge and treated water using an immersion type separation membrane installed in the fourth chamber. At this time, the fourth chamber of the reactor increases the air supply for washing to maintain an aerobic state at a dissolved oxygen amount of 2 to 5 mg / l, thereby decomposing untreated organic matter and oxidation of ammonia nitrogen in the first to third chambers. The COD is reduced and proper dissolved oxygen is maintained in the treated water to prevent the formation of spores. That is, the size of Bacillus feeder cells is 0.4 to 3 µm, but when the spores are formed, the size of the spores is increased to 0.4 to 0.8 µm, so that the fourth chamber is kept in an aerobic state. This can prevent clogging of the membrane.
    [25] In addition, the present invention can omit a separate sedimentation tank by separating the solid and liquid using a separation membrane, and can also remove various bacteria such as E. coli by using the separation membrane, so that the disinfection tank for disinfecting the treated water can be omitted.
    [26] As described above, in the present invention, the Bacillus bacteria are predominantly cultured in a tapered aeration method, but the air is supplied so that the anaerobic state is not formed. In the third chamber, Bacillus bacteria are returned to the first chamber by returning Bacillus bacteria to the first chamber. Compared with the prior art, after the conversion, the concentration of the Bacillus cells in the reaction tank can be increased to improve the treatment efficiency of nitrogen and phosphorus.
    [27] In addition, the present invention is superior in organic matter treatment efficiency compared to the prior art because the liquid mixture is separated by using the immersion-type membrane in the fourth chamber to maintain aerobic state, and to obtain a stable treated water without having a separate settling tank and disinfection tank Since the process is simple, it is effective to reduce maintenance costs and required sites.
    权利要求:
    Claims (7)
    [1" claim-type="Currently amended] In the advanced wastewater and wastewater treatment device comprising a pre-treatment facility, a flow control tank and a reaction tank divided into a plurality of chambers, Bacillus bacteria predominantly cultured,
    The reaction tank is divided into four chambers, and the first to third chambers are cultured by decimating the Bacillus bacteria, but an appropriate amount of air is injected so as not to form an anaerobic state. Returning to the first chamber, the fourth chamber is provided with an immersion type separation membrane to solidify the liquid mixture, characterized in that to separate the liquid, sewage and wastewater advanced treatment apparatus using Bacillus bacteria.
    [2" claim-type="Currently amended] The method of claim 1,
    The dissolved oxygen in the first chamber of the reactor is maintained at 0.5 to 1.5 mg / l, the dissolved oxygen in the second chamber is maintained at 0.3 to 0.5 mg / l, and the third chamber is kept below 0.3 mg / l, Advanced wastewater treatment system using a separation membrane and Bacillus bacteria, characterized in that the amount of oxygen does not fall below 0.1 mg / ℓ.
    [3" claim-type="Currently amended] The method of claim 1,
    The MLSS concentration in the first chamber of the reactor was from 7,000 to 9,000 mg / l for sewage, from 10,000 to 25,000 mg / l for manure, livestock waste and organic industrial wastewater. %, Manure, livestock wastewater and organic industrial wastewater is a high degree of sewage and wastewater treatment system using a membrane and Bacillus, characterized in that the internal transport of about 300 to 500%.
    [4" claim-type="Currently amended] In the advanced wastewater and wastewater treatment method for treating organic matter, nitrogen and phosphorus contained in wastewater and wastewater by using a wastewater advanced wastewater treatment device comprising a pretreatment facility, a flow control tank, and a reactor divided into a plurality of chambers,
    A pretreatment step of removing contaminants and the like contained in the influent wastewater;
    Adjusting the flow rate of the inflow water flowing into the first chamber of the reactor and mixing the Bacillus bacterium in the form of simple bacilli returned from the third chamber of the reactor to remove odor generated in the process;
    An aerobic decomposition step of culturing Bacillus bacteria predominantly in a tapered aerobic method in which the amount of dissolved oxygen decreases from the first chamber to the third chamber of the reactor to remove organic matter, nitrogen and phosphorus contained in the manure, livestock wastewater and organic industrial wastewater;
    An internal conveyance step of conveying Bacillus bacteria in the form of monobacterium from the third chamber of the reactor to the first chamber;
    And a membrane separation step of separating the mixed solution into sludge and treated water using an immersion type separation membrane installed in the fourth chamber of the reactor.
    [5" claim-type="Currently amended] The method of claim 4, wherein
    In the aerobic decomposition step, the first chamber of the reaction tank maintains dissolved oxygen at 0.5 to 1.5 mg / l, the dissolved oxygen in the second chamber is maintained at 0.3 to 0.5 mg / l, and the third chamber is kept below 0.3 mg / l, Advanced wastewater and wastewater treatment method using a membrane and Bacillus bacteria, characterized in that the dissolved oxygen does not fall below 0.1 mg / ℓ anywhere.
    [6" claim-type="Currently amended] The method of claim 4, wherein
    The MLSS concentration in the first chamber of the reactor in the inner conveying step was 7,000 to 9,000 mg / l for sewage, 10,000 to 25,000 mg / l for manure, livestock wastewater and organic industrial wastewater. In case of 100 ~ 200%, manure, livestock wastewater and organic industrial wastewater, 300 ~ 500% of internal transport, sewage and wastewater advanced treatment method using membrane and Bacillus.
    [7" claim-type="Currently amended] The method of claim 4, wherein
    In the membrane separation step, the fourth chamber of the reactor has a dissolved oxygen amount of 2 to 5 mg / l to maintain an aerobic state, thereby decomposing the untreated organic material in the first to third chambers. Advanced wastewater treatment using sewage.
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    同族专利:
    公开号 | 公开日
    KR100465524B1|2005-01-13|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2003-02-12|Application filed by 현대엔지니어링 주식회사, 주식회사 대경엔텍
    2003-02-12|Priority to KR20030008862A
    2004-08-18|Publication of KR20040072392A
    2005-01-13|Application granted
    2005-01-13|Publication of KR100465524B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR20030008862A|KR100465524B1|2003-02-12|2003-02-12|System and Method for wastewater treatment using membrane and Bacillus sp.|
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