• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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  • 引用文献
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  • 优先权
    • 专利摘要:
    Aeration control in wastewater treatment by monitoring nitrification byproducts. The present invention relates to a wastewater treatment method characterized in that in the aeration stage the slope of the concentration of NH4 and N2O and/or NO with respect to time is measured at time intervals and modified or maintained the flow rate of the air flow to the aeration tank according to the values of the slopes of the concentration of said compounds with time.
    公开号:ES2579992A2
    申请号:ES201530185
    申请日:2015-02-16
    公开日:2016-08-18
    发明作者:Marina ARNALDOS ORTS
    申请人:Acciona Agua SA；
    IPC主号:
    专利说明:

    image 1
    AIR CONTROL IN TREATMENT OF WASTEWATER THROUGH MONITORING OF NITRIFICATION SUBPRODUCTS DESCRIPTION
    The present invention relates to a method for the control of aeration in the treatment of wastewater by monitoring nitrification by-products, specifically by monitoring N2O and NO. Therefore, the present invention can be framed in the technical field of parameter control
    10 in wastewater treatment. STATE OF THE TECHNIQUE
    The removal of contaminants present in wastewater is carried out
    15 usually by the biological oxidation thereof by bacteria and other microorganisms. The supply of oxygen to the liquid phase so that it can be used by these microorganisms is the activity that implies the highest operating costs in the wastewater treatment plants; It has been calculated that between 45% and 75% of energy costs are due to the aeration system.
    20 This energy expenditure is particularly pronounced in plants with nitrogen oxidation, because nitrifying organisms are relatively intolerant of low concentrations of dissolved oxygen (OD) compared to heterotrophic organisms (those that eliminate organic matter). As a consequence, OD concentrations are usually maintained between 2 and 6 ppm in purification plants
    25 that include nitrification. Therefore, there is a growing interest in the development of control systems that precisely regulate the supply of air to biological processes that include nitrification to reduce operating costs as much as possible.
    30 To date, different air supply control systems for the biological process have been developed. These systems differ in the type of input variable to the control system; variables such as OD concentration, oxidation-reduction potential, and the concentration of the main nitrification products (ammonium, nitrite and nitrate) have been used relatively satisfactorily. The
    The main deficiency of these variables is that they do not provide any information on the metabolic state of the organisms that have to carry out the nitrifying function, that is, they do not provide information on their ability to nitrify in the circumstances to which they are subjected in the process.
    image2
    In chapter 16 of the book Research on Nitrification and Related Processes, called
    5 Protocol for the Measurement of Nitrous Oxide Fluxes from Biological Wastewater Treatment Plants, written by Kartik Chandran describes the measurement of N2O with the intention of controlling its emissions. Likewise, Mike S. M Jetten et al. (Water research 43, 17, pp. 4093-4103, 2009) studies how to reduce the emission of N2O, greenhouse gas.
    10 French patent FR2954306 describes a water treatment process in which the concentration of N2O is measured and the air flow is increased while it is detected.
    15 M. D. Butler et al. (Water Research, Volume 43, 5, pp. 1265-1272, 2009) studies whether N2O can be used as an indicator of nitrification failure. DESCRIPTION OF THE INVENTION
    The present invention relates to a method for the control of aeration in the treatment of wastewater by monitoring nitrification by-products, specifically by monitoring N2O and NO.
    The idea of the new control system is to optimize the aeration of the process
    Biological using nitrification by-products of nitrifying bacteria as input variable; The level of production of these by-products provides information on whether organisms are adequately nitrifying or, on the contrary, are subject to metabolic stress that will trigger a nitrification failure imminently.
    The advantages of the process of the invention are:
    -More energy efficiency of the plant, since although usually work between 2 and 6 ppm of oxygen, it has been shown that oxidizing ammonium bacteria can
    35 maintain normal activity at much lower concentrations of oxygen; -the control system is safer against possible process destabilization, since the aeration action will be carried out before there is a total nitrification failure
    image3
    Therefore, in a first aspect, the present invention relates to a wastewater treatment process characterized in that in the aeration stage: the slope of the concentration of NH4 and N2O and / or is measured at intervals of time NOT with respect to time; - the flow of the air flow to the aeration tank is modified or maintained;
    10 where the time intervals range from 0.05 hours to 10 hours;
    with the condition of:
    15 - the flow of the air flow to the aeration tank is maintained if the slope of the NH4 concentration is less than 0.5 mgN / Lh and the slope of the concentration of N2O and / or NO is equal to or greater than 0.002 mgN / Lh during the measured interval;
    -the flow of air flow to the aeration tank is maintained if the slope of the NH4 concentration is equal to or greater than 0.5 mgN / Lh and the concentration of N2O and / or NO is less than 0.002 mgN / Lh during the measured interval;
    - the flow rate of the air flow to the aeration tank is increased between 5% and 60% if the slope of the NH4 concentration is equal to or greater than 0.5 mgN / Lh and the slope of the N2O concentration and / or NOT equal to or greater than 0.002 mgN / Lh during the measured interval;
    - the flow of the air flow to the aeration tank is decreased between 5% and 60% if the slope of the NH4 concentration is less than 0.5 mgN / Lh and the slope of the concentration of N2O and / or NO It is less than 0.002 mgN / Lh during the measured interval.
    By mgN / Lh is meant mg in terms of nitrogen per liter per hour. Nm3 / h means normal cubic meter per hour. Wastewater treatment means the transformation of matter
    35 organic and / or nitrogen compounds through the action of a microorganism.
    image4
    The aeration stage means any of the reactors in which an aerobic water treatment is carried out; that is, microorganisms oxidize organic matter and / or nitrogen compounds thanks to an external supply of oxygen and / or air.
    5 Aeration tank means a reactor of the aeration stage.
    In an embodiment of the first aspect of the present invention, the time intervals comprise from 0.5 hours to 5 hours, preferably from 0.75 hours to 2 hours, more preferably the time intervals are from 1 hour.
    In an embodiment of the first aspect of the present invention, the slope of the concentration of NH4 and N2O is measured. That is, the procedure would be a wastewater treatment procedure characterized by that in the aeration stage:
    15 - the slope of the concentration of NH4 and N2O with respect to time is measured at time intervals; - the flow of the air flow to the aeration tank is modified or maintained;
    where the time intervals range from 0.05 hours to 10 hours; 20 with the proviso that:
    -the flow rate of air to the aeration tank is maintained if the slope of the NH4 concentration is less than 0.5 mgN / Lh and the slope of the concentration of 25 N2O is equal to or greater than 0.002 mgN / Lh during the interval measured;
    - the flow of the air flow to the aeration tank is maintained if the slope of the NH4 concentration is equal to or greater than 0.5 mgN / Lh and the concentration of N2O is less than 0.002 mgN / Lh during the measured interval;
    30 - the flow rate of the air flow to the aeration tank is increased between 5% and 60% if the slope of the NH4 concentration is equal to or greater than 0.5 mgN / Lh, and the slope of the N2O concentration is equal to or greater than 0.002 mgN / Lh during the measured interval;
    35 - the flow rate of the air flow to the aeration tank is decreased between 5% and 60% if the slope of the NH4 concentration is less than 0.5 mgN / Lh and the slope of the N2O concentration is less than 0.002 mgN / Lh during the measured interval.
    image5
    In another embodiment of the first aspect of the present invention, the flow rate of the air flow to the aeration tank increases between 10% and 35%. That is, in the event that the condition is met so that the air flow rate increases (the slope of the NH4 concentration is equal to or greater than 0.5 mgN / Lh and the slope of the N2O concentration and / or NOT equal to or greater than 0.002 mgN / Lh during the interval
    10 measured), this will be between 10% and 35% of the value of the previous flow.
    In another embodiment of the first aspect of the present invention, the flow of air flow to the aeration tank decreases between 10% and 35%. That is, in the event that the condition is met so that the air flow rate decreases (the slope
    15 of the NH4 concentration is less than 0.5 mgN / Lh and the slope of the concentration of N2O and / or NO is less than 0.002 mgN / Lh during the measured interval), this will be between 10% and 35%. % of the previous flow value.
    In another embodiment of the first aspect of the present invention, wastewater
    20 have a chemical oxygen demand of between 50 mg / L and 1000 mg / l, preferably between 100 mg / L and 500 mg / L.
    In another embodiment of the first aspect of the present invention, the wastewater has an ammonium concentration of between 5 mgN / L and 100 mgN / L, preferably
    25 between 10 mgN / L and 50 mgN / L.
    Throughout the description and the claims the word "comprises" and its variants are not intended to exclude other technical characteristics, additives, components or steps. For experts in the field, other objects, advantages and characteristics of the
    The invention will be derived partly from the description and partly from the practice of the invention. The following examples are provided by way of illustration, and are not intended to be limiting of the present invention.
    EXAMPLES
    The invention will now be illustrated by tests carried out by the inventors, which demonstrates the effectiveness of the product of the invention.
    image6
    Example 1. Aeration of wastewater following the process of the invention
    5 The wastewater used in this example is municipal wastewater with an average organic matter concentration of 200 mg / L (in terms of chemical oxygen demand) and 30 mg / L of ammonium (in terms of nitrogen). The wastewater treatment plant (WWTP) of the present example treats a water flow
    10 of 6 m3 / h and has a single aerobic tank of 20 m3 capacity. The retention time of solids in the system is approximately 6 days. The initial air flow is 20 Nm3 / h.
    In the example described, there is an ammonium sensor installed in the plant
    15 wastewater treatment (WWTP); This is placed at the top of the floor measuring the ammonium that enters with the influent. Additionally, the liquid phase N2O in the aerobic tank is measured (in the present example, the aeration stage is composed of a single aerobic tank) that measures the concentration of said species in the liquid phase. Concentrations are measured continuously; measured values
    20 are registered in a WWTP supervision and control system (SCADA). In this situation, the concentrations recorded by the sensors are used by the control system installed in the SCADA to calculate the slope of variation of each of the species at intervals of 1 hour. A significant increase in ammonium concentration is considered when the recorded slope exceeds
    25 0.5 mg / (L h) in terms of nitrogen. A significant increase in the concentration of N2O is considered when the recorded slope exceeds 0.002 mg / (L h) in terms of nitrogen.
    Hourly calculations of the slopes of each species are carried out and then
    30 the control uses this information to make decisions regarding the necessary flow of the blower. The possible decisions of the control system are described below:
    -If the ammonium undergoes a significant increase and the N2O undergoes a significant increase, then the flow rate of the blower increases 5 Nm3 / h
    image7
    -If the ammonium undergoes a significant increase and the N2O does not suffer a significant increase, then the flow of the blower is maintained at the previous value -If the N2O undergoes a significant increase and the NH4 does not suffer a significant increase, then the flow rate of the blower is maintained at the previous value 5 -If the N2O does not suffer a significant increase and the NH4 does not suffer a significant increase, then the flow rate of the blower decreases by 5 Nm3 / h.
    In the described situation, there is a saving in flow of blower - and therefore, in electrical energy consumed - with respect to conventional aeration control systems from online oxygen measurements. This is because the blower is only activated in situations where there is an increase in the load to the biological process (that is, a significant increase in ammonium concentrations) and simultaneously, nitrifying microorganisms show a difficulty in processing said increase. load (there is a significant increase in the 15 concentrations of N2O). In conventional processes, an oxygen setpoint is established and the blower works to maintain said setpoint, regardless of the load to the process and, above all, of the ability of the nitrifying microorganisms to process it. In the example described, with the implementation of a control based on nitrification by-products, savings of at least one
    20 20% with respect to the energy consumption of a conventional process.
    There are other aeration control systems in addition to conventionally implemented. One of the most effective is the ammonium-based control at the plant head; In this control, air is supplied to the biological tank as a function of the load entering the plant. However, this control does not use information on the ability of microorganisms to process the load introduced into the biological tank. This generates situations in which unnecessary energy is spent because although the load increases, the nitrifying microorganisms are able to process it without risk to the process. In addition, ammonium control ignores the
    30 situation in which, although the load does not increase, the microorganisms are inhibited by some environmental situation (toxic discharge, temperature decreases, etc.) and the continuity of the process is put in danger. In the example described, there is an energy saving of at least 10% compared to the ammonium controls in the header.
    35
    权利要求:
    Claims (9)
    [1]
    image 1
    1. Wastewater treatment procedure characterized by that in the aeration stage:
    5-the slope of the concentration of NH4 and N2O and / or NO with respect to time is measured at time intervals; - the flow of the air flow to the aeration tank is modified or maintained;
    where the time intervals range from 0.05 hours to 10 hours; 10 with the proviso that:
    - the flow of the air flow to the aeration tank is maintained if the slope of the NH4 concentration is less than 0.5 mgN / Lh and the slope of the concentration of 15 N2O and / or NO is equal to or greater than 0.002 mgN / Lh during the measured interval;
    - the flow of the air flow to the aeration tank is maintained if the slope of the NH4 concentration is equal to or greater than 0.5 mgN / Lh and the concentration of N2O and / or NO is less than 0.002 mgN / Lh during the measured interval;
    20 - the flow rate of the air flow to the aeration tank is increased between 5% and 60% if the slope of the NH4 concentration is equal to or greater than 0.5 mgN / Lh, and the slope of the N2O concentration and / or NOT equal to or greater than 0.002 mgN / Lh during the measured interval; or
    25 - the flow rate of the air flow to the aeration tank is decreased between 5% and 60% if the slope of the NH4 concentration is less than 0.5 mgN / Lh and the slope of the concentration of N2O and / or It is NOT less than 0.002 mgN / Lh during the measured interval.
    30
    [2]
    2. Method according to claim 1 wherein the time intervals comprise from 0.5 hours to 5 hours.
    [3]
    3. Method according to any of the preceding claims wherein the time intervals comprise from 0.75 hours to 2 hours.
    9
    image2
    [4]
    4. Method according to any of the preceding claims wherein the slope of the concentration of NH4 and N2O is measured.
    [5]
    5. Method according to any of the preceding claims wherein the flow rate 5 air flow to the aeration tank increases between 10% and 35%.
    [6]
    6. Method according to any of the preceding claims wherein the flow rate of the air flow to the aeration tank decreases between 10% and 35%.
    Method according to any of the preceding claims wherein the wastewater has a chemical oxygen demand between 50 mg / L and 1000 mg / L.
    [8]
    8. Method according to the preceding claim, wherein the wastewater has
    a chemical oxygen demand of between 100 mg / L and 500 mg / L. fifteen
    [9]
    9. Method according to any of the preceding claims, wherein the wastewater has an ammonium concentration of between 5 mgN / L and 100 mgN / L.
    [10]
    10. Method according to the preceding claim, wherein the wastewater has an ammonium concentration of between 10 mgN / L and 50 mgN / L.
    10
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    引用文献:
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    JPS6221600B2|1979-05-16|1987-05-13|Hitachi Ltd|
    GB9907210D0|1999-03-30|1999-05-26|Stephenson Tom|Nitrification monitor|
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    申请号 | 申请日 | 专利标题
    ES201530185A|ES2579992B1|2015-02-16|2015-02-16|AIR CONTROL IN TREATMENT OF WASTEWATER THROUGH MONITORING OF NITRIFICATION SUBPRODUCTS|ES201530185A| ES2579992B1|2015-02-16|2015-02-16|AIR CONTROL IN TREATMENT OF WASTEWATER THROUGH MONITORING OF NITRIFICATION SUBPRODUCTS|
    PT16708189T| PT3260425T|2015-02-16|2016-01-28|Aeration control in waste water treatment by monitoring nitrification by-products|
    AU2016221583A| AU2016221583A1|2015-02-16|2016-01-28|Aeration control in waste water treatment by monitoring nitrification by-products|
    CA2976163A| CA2976163A1|2015-02-16|2016-01-28|Control of aeration in the treatment of wastewater through the monitoring of nitrification by-products|
    PCT/ES2016/070048| WO2016131998A1|2015-02-16|2016-01-28|Aeration control in waste water treatment by monitoring nitrification by-products|
    TR2019/07509T| TR201907509T4|2015-02-16|2016-01-28|Aeration control in wastewater treatment by monitoring nitrification by-products.|
    EP16708189.2A| EP3260425B1|2015-02-16|2016-01-28|Aeration control in waste water treatment by monitoring nitrification by-products|
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