CN215006353U - Aeration quantity and internal reflux quantity optimal control system based on MABR (moving average aeration ratio) process - Google Patents
Aeration quantity and internal reflux quantity optimal control system based on MABR (moving average aeration ratio) process Download PDFInfo
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- CN215006353U CN215006353U CN202120540151.1U CN202120540151U CN215006353U CN 215006353 U CN215006353 U CN 215006353U CN 202120540151 U CN202120540151 U CN 202120540151U CN 215006353 U CN215006353 U CN 215006353U
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Abstract
The utility model discloses an aeration rate and interior backward flow volume optimal control system based on MABR technology, the system includes on-line monitoring system, MABR aeration systems, good oxygen pond aeration systems, interior backward flow system, outer backward flow system, surplus sludge discharge system, aeration PLC control system and interior backward flow PLC control system. An MABR tank is added between the anoxic tank and the aerobic tank, and the special membrane aeration process of the MABR is adopted, so that the anisotropic mass transfer of dissolved oxygen and pollutants on a biological membrane is realized, the oxygen utilization efficiency is improved, the synchronous nitrification and denitrification reaction is realized, and the aeration energy consumption is further reduced; the MABR tank can partially and maximally remove nitrogen, so that the aeration time of the aerobic tank can be shortened or the aeration of the aerobic tank is closed, and the aeration energy consumption is further saved; due to the synchronous nitrification and denitrification of the MABR, the internal reflux amount of nitrate nitrogen can be reduced, and the energy consumption generated by the internal reflux is further reduced; through the combined control of the anoxic tank, the MABR tank and the aerobic tank, the power consumption of a sewage plant can be reduced, and the operating cost is saved.
Description
Technical Field
The utility model belongs to sewage treatment technique and energy saving and consumption reduction control field, concretely relates to aeration rate and internal reflux volume optimal control system based on MABR technology. The MABR English name is Membrane Aerated Biofilm Reactor.
Background
Along with the trend of sewage resource utilization, the effluent quality standard of a sewage treatment plant is continuously improved. The sewage treatment plant changes the mode of putting high energy consumption and high material consumption into the mode of getting the effluent quality reaching the standard. The adoption of suspended fillers to construct an activated sludge-biofilm composite system is one of the mainstream technical routes for upgrading and modifying the sewage treatment plant at present. The fluidization of the suspended filler is realized through external aeration, and the dissolved oxygen and pollutants carry out equidirectional mass transfer to a biological film formed on the suspended filler. And the MABR carries out the anisotropic mass transfer in a bubble-free aeration mode, namely oxygen permeates the membrane from the air side of the membrane, then is diffused to the sewage side, and carries out nitration reaction on the sewage side to form a nitrified microbial membrane layer. Because the external mixed liquor is in an anoxic state, the denitrifying bacteria can utilize the nitrate and the carbon source in the sewage to carry out denitrification reaction, thereby realizing the synchronous nitrification and denitrification processes. The oxygen of the MABR process is directly utilized by a nitrifying microbial layer of a biological membrane by virtue of free diffusion, so that the energy consumption can be reduced and the oxygen utilization efficiency can be improved. And because the synchronous nitrification and denitrification reaction of the MABR process are carried out at the upstream of the aerobic tank, the reflux quantity in the nitrified liquid can be reduced or saved. The MABR is one of promising sewage plant upgrading and reconstruction processes and has the advantage of reducing energy consumption. Therefore, how to carry out combined optimization control on the aeration quantity of the MABR tank and the aerobic tank and the internal reflux quantity of the biochemical tank is also a problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an aeration rate and internal reflux volume optimal control system and method based on MABR technology. Aiming at the problem that the sewage treatment plant meets the purpose of reaching the standard of the total nitrogen of the effluent through high energy consumption and high material consumption investment, an MABR process is coupled between an anoxic tank and an aerobic tank of an A/A/O process to improve the oxygen utilization rate and the denitrification efficiency, so that the aeration energy consumption and the internal reflux quantity are reduced. The utility model discloses an on-line monitoring instrument data collection adopts data analog computation analysis's method, establishes MABR and optimizes aeration, good oxygen pond aeration as required and the logical control of internal reflux optimization flow, realizes the minimizing of energy consumption and the optimization of technology operation.
The purpose of the utility model is realized through the following technical scheme:
an aeration rate and internal reflux rate optimal control system based on an MABR (anaerobic aerobic biofilm reactor) process is characterized by comprising an online monitoring system, an MABR aeration system, an aerobic tank aeration system, an internal reflux system, an external reflux system, a residual sludge discharge system, an aeration PLC (programmable logic controller) control system and an internal reflux PLC control system.
Further, the on-line monitoring system comprises a flow measuring instrument, a COD analyzer and NH4-N analyzer, NO3-N analyzer, dissolved oxygen meter, temperature meter, pH meter, MLSS analyzer, total nitrogen analyzer. Wherein the water inlet end of the anoxic pond is provided with NO3A flow measuring instrument, a COD analyzer and NH are arranged at the water outlet end of the anoxic tank4-an N analyzer; the middle section of the MABR tank is provided with a temperature measuring instrument, a pH measuring instrument, an MLSS analyzer and a dissolved oxygen measuring instrument, and the tail end of the MABR tank is provided with NO3-N analyzer, MABR effluent flow meter, effluent COD analyzer and effluent NH4-an N analyzer; good tasteThe middle section of the oxygen tank is provided with a temperature measuring instrument, a pH measuring instrument, an MLSS analyzer and a dissolved oxygen measuring instrument, and the water outlet section of the aerobic tank is provided with a COD analyzer and a total nitrogen analyzer; the internal reflux system is provided with an internal reflux flowmeter; the residual sludge discharge system is provided with a residual sludge flowmeter and a residual sludge MLSS analyzer. Flow measuring instrument, COD analyzer, NH4-N analyzer, NO3the-N analyzer, the DO measuring instrument, the temperature measuring instrument, the pH measuring instrument, the MLSS analyzer and the total nitrogen analyzer are electrically connected with the aeration PLC and the internal reflux control PLC respectively.
Further, the MABR aeration system comprises an MABR aeration process air blower, an MABR aeration air blower flow meter, an MABR aeration air blower automatic control valve, an MABR aeration process pipeline, an MABR biofilm scrubbing air blower, a scrubbing air blower flow meter, a scrubbing air blower automatic control valve, a scrubbing air pipeline, an MABR stirring air blower, a stirring air blower automatic control valve and a stirring air pipeline.
Furthermore, the aerobic tank aeration system comprises an aerobic tank aeration blower, a blower flow meter, an automatic control valve and an aeration pipeline.
Further, the internal reflux system comprises an internal reflux pump, an internal reflux flowmeter and an internal reflux pipeline.
Further, the external reflux system comprises an external reflux pump and an external reflux pipeline.
Further, the excess sludge discharge system comprises an excess sludge pump, an excess sludge flow meter, an excess sludge MLSS analyzer and an excess sludge discharge pipeline. Furthermore, in the MABR aeration control system, the anoxic tank water inlet on-line monitoring system, the MABR tank on-line monitoring system and the residual sludge on-line monitoring system are all connected with the aeration PLC control system, an MABR aeration process fan, a flow meter and an automatic control valve are arranged on an MABR aeration pipeline, and the MABR aeration process fan, the flow meter and the automatic control valve are all connected with the aeration PLC control system.
Furthermore, in the aeration control system of the aerobic tank, an online water outlet monitoring system at the tail end of the MABR tank and the online aerobic tank monitoring system are connected with the aeration PLC control system, an aeration fan, a flow meter and an automatic control valve of the aerobic tank are arranged on an aeration pipeline of the aerobic tank, and the aeration fan, the flow meter and the automatic control valve of the aerobic tank are connected with the aeration PLC control system.
Furthermore, in the internal reflux quantity control system, the anoxic tank online monitoring system, the MABR tank tail end online monitoring system, the aerobic tank online monitoring system and the internal reflux online monitoring system are all connected with the internal reflux PLC control system, an internal reflux pump and a flowmeter are arranged on the internal reflux pipeline, and the internal reflux pump and the flowmeter are all connected with the internal reflux PLC control system.
Furthermore, the blowers are all frequency conversion blowers and are provided with frequency converters; the internal reflux pump and the excess sludge pump adopt variable frequency pumps and are provided with frequency converters.
The utility model also provides an aeration rate and internal reflux volume optimal control method based on MABR technology, its characterized in that:
MABR aeration quantity optimization control method
Adopts an anoxic tank effluent flow measuring instrument, an anoxic tank effluent COD analyzer and an anoxic tank effluent NH4-N analyzer, MABR pool MLSS analyzer, anoxic pool influent NO3And calculating on-line monitoring data of the N analyzer, the excess sludge flow meter and the excess sludge MLSS analyzer to be used as feedforward parameters, and calculating the oxygen demand of the MABR pool by utilizing a neural network algorithm according to the MABR aeration oxygen demand prediction model. Because the MABR technology biological membrane can carry out synchronous nitrification and denitrification, the oxygen demand calculation formula is as follows:
in the formula (1), OMIs a theoretical requirement of an MABR poolOxygen amount, mg O2/d；QAThe flow rate of the water outlet end of the anoxic pond is L/d; sCODThe COD concentration of the effluent of the anoxic tank is mg COD/L; 1-fcYcOxygen consumption for heterotrophic bacteria growth on biofilms: f. ofcIs the ratio of COD concentration to biological membrane VSS, mgCOD/mgVSS, YcIs the yield coefficient;
endogenous respiratory oxygen demand for heterotrophic bacteria: f. ofHIs a heterotrophic bacteria non-biodegradable component, mg COD/mg COD; bHFor the rate of endogenous consumption of heterotrophic bacteria, d-1Theta is the total solid retention time of the suspended sludge and the biological membrane; 1mgNH per oxide4N requires 4.57mgO2，NaFor water outlet NH of anoxic tank4Concentration of-N, mgNH4-N/L; 1mgNO per denitrification3Recovery of 2.86mgO from-N2，NNitFor feeding NO into anoxic pond3Concentration of-N, mg NO3-N/L。
The total solids retention time θ of suspended sludge and biofilm in formula (1) is calculated in formula (2). Wherein S isMLSSThe concentration of the suspended sludge in the MABR tank is mg/L; v is the MABR cell volume, m3；ASSASpecific surface area of MABR film, m3/m3(ii) a F is the filling ratio of the membrane in the tank,%; b isbfIs the amount of biofilm per unit area, g/m2；QWASThe flow rate of the excess sludge is L/d; sWASIs the biological sludge concentration, mg/L.
In the formula (3), OMABRActual oxygen demand for the MABR; dbfM is the diffusion coefficient of oxygen in the biofilm2D; alpha is the penetration degree of oxygen in the MABR biofilm; dCODIs the diffusion coefficient of substrate COD in the biofilm, m2D; beta is the penetration degree of substrate COD in the biological membrane; daM is the diffusion coefficient of substrate ammonia nitrogen in the biological membrane2D; gamma is the penetration degree of substrate ammonia nitrogen in the MABR biological membrane.
Further, online monitoring data of a temperature measuring instrument and a pH measuring instrument in the MABR tank are used as process parameters, and O is measuredMABRAdjustment and correction are performed.
Further, the MABR tank is an activated sludge-biofilm composite system, and meanwhile, in order to achieve the purpose of synchronous nitrification and denitrification, the dissolved oxygen concentration of the suspended sludge outside the MABR tank is controlled to be below 0.1mg/L so as to maintain the anoxic environment outside the biofilm. Therefore, the online monitoring data of the MABR pool dissolved oxygen measuring instrument is used as feedback data to the OMABRAnd performing feedback regulation.
Further, according to the adjusted OMABRAnd the frequency of an MABR aeration process blower and the opening of an automatic aeration control valve are adjusted by an aeration PLC control system, so that the synchronous nitrification and denitrification functions of the MABR tank are realized, and the anoxic environment outside the MABR biological membrane is maintained, namely the dissolved oxygen concentration is controlled to be lower than 0.1 mg/L.
MABR tank and aerobic tank aeration rate combined optimization control method
As the MABR has the performance of synchronous nitrification and denitrification, the MABR can treat COD and NH4-N is partially or marginally removed. When part of COD and NH is removed by MABR4When N is below zero, the aerobic tank still needs to supply oxygen according to the concentration of the pollutants; when MABR is to COD and NH4And when the-N is removed to the limit, the aerobic tank does not need to be aerated, so that the aeration energy consumption of the aerobic tank is reduced. Therefore, the utility model discloses in according to the effect of getting rid of the pollutant in MABR pond, adopt the mode of aeration as required to control good oxygen pond.
According to NH of sewage treatment plant4And determining whether the aeration of the aerobic tank is continued or not according to the water quality standard of the N effluent of X mg/L. When water outlet NH of the MABR tank4When the N concentration is less than or equal to X mg/L, stopping aeration of the aerobic tank; when water outlet NH of the MABR tank4When the-N concentration is more than or equal to X mg/L, the aerobic tank is started to carry out aeration control as required.
Adopting an MABR pool water flow measuring instrument, an MABR pool water COD analyzer and an MABR pool water NH4On-line monitoring data of the N analyzer is used as a feedforward parameter for calculating the aeration quantity of the aerobic tank, and the calculation formula is as follows:
in the formula (4), OoxicThe oxygen demand of the aerobic tank is mg O2/d；QMThe water flow rate of the MABR tank is L/d; sMCODThe COD concentration of the effluent of the MABR tank is mg COD/L; 1-fcsYcsThe oxygen consumption for the growth of heterotrophic bacteria of the activated sludge in the aerobic tank is as follows: f. ofcsThe ratio of COD concentration of effluent of the MABR tank to VSS of active sludge in the aerobic tank is mgCOD/mgVSS, YcsIs the yield coefficient;
endogenous respiratory oxygen demand for heterotrophic bacteria: f. ofHIs a heterotrophic bacteria non-biodegradable component, mg COD/mg COD; bHFor the rate of endogenous consumption of heterotrophic bacteria, d-1，θSIs the solids retention time of the activated sludge; n is a radical ofAMFor the water NH discharged from the MABR tank4Concentration of-N, mg NH4-N/L. Solid retention time theta of activated sludge in aerobic tankSIs calculated in the formula (5), wherein VbFor biochemical pool volume, L.
Further, on-line monitoring data of an aerobic tank middle section temperature measuring instrument, a pH measuring instrument, an MLSS analyzer and a dissolved oxygen measuring instrument are used as process parameters, and O is measuredoxicAnd (6) correcting.
Further, online monitoring data of the aerobic tank effluent COD analyzer and the total nitrogen analyzer are used as feedback parameters to perform O-reactionoxicAnd (6) adjusting.
Further, according to the adjusted OoxicAnd the start-stop and frequency of an aeration blower of the aerobic tank and the opening of an automatic control valve on an aeration pipeline of the aerobic tank are adjusted by an aeration PLC control system. Wherein the dissolved oxygen concentration of the aerobic tank is controlled below 2 mg/L.
3. Internal reflux quantity optimization control method
Because the MABR tank can generate denitrification reaction, part is removedOr all NO3N, thereby reducing the internal reflux amount or omitting the internal reflux and reducing the energy consumption generated by the internal reflux.
Adopting MABR tank effluent NH4-N analyzer and NO3On-line monitoring data of the-N analyzer is used as a judgment basis when the effluent NH of the MABR tank4-N concentration X mg/L or less and NO3And when the concentration of N is close to 0mg/L, the limit removal of TN can be realized through the synchronous nitrification and denitrification of the MABR tank, and the internal reflux system is closed.
When the above conditions are not met, the water inlet NO of the anoxic pond is adopted3-N analyzer, MABR tank effluent NO3-using online monitoring data of the N analyzer as a feedforward parameter, and calculating an optimal internal reflux ratio by using a neural network algorithm, wherein the calculation formula is as follows:
Qr＝aQA (10)
in the formula (6), a is the optimum reflux ratio, wherein the calculation formula of A, B, C is shown in the formulas (7), (8) and (9). In the formula (7), OaConcentration of dissolved oxygen, mgO, for internal reflux2And L. In the formula (8), NMFor MABR tank effluent NO3Concentration of-N, mgNO3-N/L；NAFor feeding NO into anoxic pond3Concentration of-N, mgNO3-N/L；DMThe denitrification capacity of the MABR tank is mgN/L; dAThe denitrification capacity of the anoxic pond is mgN/L; o issConcentration of dissolved oxygen, mgO, for external reflux2L; s is the external reflux ratio. In the formula (10), QrIs the internal reflux amount, L/d; qAThe flow rate of the water outlet end of the anoxic pond is L/d.
Further, according to the online monitoring data of the MLSS analyzer of the aerobic tank as the process parameters and the online monitoring data of the total nitrogen analyzer at the tail end of the aerobic tank as the feedback parameters, Q is adjustedrAnd (6) correcting and adjusting.
Further, according to the adjusted QrAnd the variable frequency pump and the frequency converter on the inner return pipeline are adjusted by the inner return PLC control system to realize the optimization of the inner return flow.
Compared with the prior art, the utility model has the advantages that: (1) an MABR tank is added between the anoxic tank and the aerobic tank, and the special membrane aeration process of the MABR is adopted, so that the anisotropic mass transfer of dissolved oxygen and pollutants on a biological membrane is realized, the oxygen utilization efficiency is improved, the synchronous nitrification and denitrification reaction is realized, and the aeration energy consumption is further reduced; (2) the MABR tank can partially and maximally remove nitrogen, so that the aeration time of the aerobic tank can be shortened or the aeration of the aerobic tank is closed, and the aeration energy consumption is further saved; (3) due to the synchronous nitrification and denitrification of the MABR, the internal reflux amount of nitrate nitrogen can be reduced, and the energy consumption generated by the internal reflux is further reduced; (4) the power consumption cost of the sewage plant can be reduced by the combined control of the anoxic tank, the MABR tank and the aerobic tank.
Drawings
Fig. 1 is a schematic view of an aeration amount and internal reflux amount optimization control system based on an MABR process provided by an embodiment of the present invention.
In fig. 1: 1. aeration PLC, 2, MABR aeration process blower, 3, MABR aeration blower flowmeter, 4, MABR aeration blower automatic control valve, 5, MABR aeration process pipeline, 6, MABR biomembrane scrubbing blower, 7, scrubbing blower flowmeter, 8, scrubbing blower automatic control valve, 9, scrubbing air pipeline, 10, MABR stirring blower, 11, stirring blower automatic control valve, 12, stirring air pipeline, 13, aerobic pool aeration blower, 14, aerobic pool blower flowmeter, 15, aerobic pool blower automatic control valve, 16, aerobic pool aeration pipePath 17, internal reflux PLC, 18, internal reflux pump, 19, internal reflux flowmeter, 20, internal reflux pipeline, 21, external reflux pump, 22, external reflux pipeline, 23, flow measuring instrument, 24, COD analyzer, 25, NH4-N analyzer, 26.NO3-N measuring instrument, 27 dissolved oxygen measuring instrument, 28 temperature measuring instrument, 29 pH measuring instrument, 30 MLSS analyzer, 31 total nitrogen analyzer, 32 excess sludge pump, 33 excess sludge flow meter, 34 excess sludge discharge line.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples of the specification.
The embodiment provides an aeration quantity and internal reflux quantity optimal control system and method based on an MABR (moving average bed biofilm reactor) process, and the applied process operation conditions are as follows: the biochemical pool of a certain urban sewage treatment plant adopts the process of an anaerobic pool-an anoxic pool-an MABR pool-an aerobic pool, and the effluent quality meets the first-level standard A in the discharge Standard of pollutants for urban sewage treatment plants.
As shown in fig. 1, an aeration rate and internal reflux rate optimization control system based on an MABR process, an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank are connected in sequence; an MABR pool is added between the anoxic pool and the aerobic pool; an online monitoring system is arranged on the MABR tank, and NO is arranged at the water inlet end of the online monitoring system including the anoxic tank3A N analyzer (26), a flowmeter (23), a COD analyzer (24) and NH are arranged at the water outlet end of the anoxic tank4-an N analyzer (25); the middle section of the MABR tank is provided with a temperature measuring instrument (28), a pH measuring instrument (29), an MLSS analyzer (30) and a dissolved oxygen measuring instrument (27), and the tail end of the MABR tank is provided with NO3-N analyzer (26), effluent flow meter (23), effluent COD analyzer (24), effluent NH4-an N analyzer (25); the middle section of the aerobic tank is provided with a temperature measuring instrument (28), a pH measuring instrument (29), an MLSS analyzer (30) and a dissolved oxygen measuring instrument (27), and the tail end water outlet section of the aerobic tank is provided with a COD analyzer (24) and a total nitrogen analyzer (31).
An aeration rate and internal reflux rate optimal control system based on an MABR process is provided with an MABR aeration system, and the MABR aeration system comprises an MABR aeration process air blower (2), an air blower flow meter (3), an air blower automatic control valve (4) and an aeration process pipeline (5). The air blower flow meter (3) and the air blower automatic control valve (4) are arranged on the aeration process pipeline (5), and the MABR aeration process air blower (2) is arranged on the aeration process pipeline (5) and is electrically connected with the aeration PLC control system (1).
An aeration rate and internal reflux rate optimizing control system based on an MABR (moving aerobic biofilm reactor) process is provided with an aerobic tank aeration system, and the aerobic tank aeration system comprises an aerobic tank aeration blower (13), a blower flow meter (14), a blower automatic control valve (15) and an aeration process pipeline (16). The air blower flow meter (14) and the air blower automatic control valve (15) are arranged on the aeration process pipeline (16), and the aerobic pool aeration air blower (13) is arranged on the aeration process pipeline (16) and is electrically connected with the aeration PLC control system (1).
An aeration quantity and internal reflux quantity optimizing control system based on an MABR (moving average membrane bioreactor) process is provided with an internal reflux system, wherein the internal reflux system comprises an internal reflux pump (18), an internal reflux flowmeter (19) and an internal reflux pipeline (20). The internal reflux pump (18) and the internal reflux flowmeter (19) are arranged on the internal reflux pipeline (20) and are electrically connected with the internal reflux PLC control system (17); the internal reflux flow meter (19) is used for recording the internal reflux flow.
An aeration rate and internal reflux rate optimizing control system based on an MABR process is provided with an excess sludge discharge system, wherein the excess sludge discharge system comprises an excess sludge pump (32), an excess sludge flowmeter (33), an excess sludge MLSS analyzer (30) and an excess sludge discharge pipeline (34). The excess sludge pump (32), the excess sludge flow meter (33) and the excess sludge MLSS analyzer (30) are arranged on the excess sludge discharge pipeline (34), and the excess sludge flow meter (33) and the excess sludge MLSS analyzer (30) are electrically connected with the aeration PLC control system (1).
An aeration quantity and internal reflux quantity optimal control system based on an MABR (moving average aeration ratio) process is provided with an external sludge reflux system, and the external sludge reflux system comprises an external reflux pump (21) and an external reflux pipeline (22). An outer return pump (21) is arranged on an outer return pipeline (22) from the bottom of the sedimentation tank to the front end of the anaerobic tank.
The aeration PLC control system (1) is also connected with an MABR biological film scrubbing air blower (6), and the MABR biological film scrubbing air blower (6) is connected with the MABR through a scrubbing air blower flow meter (7), a scrubbing air blower automatic control valve (8) and a scrubbing air pipeline (9).
The aeration PLC control system (1) is also connected with an MABR stirring blower (10), and the MABR stirring blower (10) is connected with an MABR pool through an automatic stirring blower control valve (11) and a stirring air pipeline (12).
Based on an aeration oxygen demand of an MABR pool and an aeration pool and an internal reflux optimization model of an anoxic pool, a neural network algorithm is utilized, and an anoxic pool water flow measuring instrument (23), an anoxic pool water COD analyzer (24) and an anoxic pool water NH are adopted4-N analyzer (25), MABR tank MLSS analyzer (30), anoxic tank influent NO3On-line monitoring data of the N analyzer (26), the excess sludge flow meter (33) and the excess sludge MLSS analyzer (30) are used as feedforward parameters and are transmitted to a data processing unit of the aeration PLC control system (1) for analysis to obtain the oxygen demand O of the MABR tankMABR(ii) a Then, the online monitoring data of the MABR pool temperature measuring instrument (28) and the pH measuring instrument (29) are used as process parameters, the online monitoring data of the MABR pool dissolved oxygen measuring instrument (27) are used as feedback parameters, the feedback parameters are transmitted to a data processing unit of the aeration PLC control system (1), and the optimal oxygen demand O of the MABR pool is obtainedMABRAnd (6) correcting.
Based on an aeration oxygen demand optimization model of the MABR tank and the aerobic tank and an internal reflux optimization model of the anoxic tank, a neural network algorithm is utilized, and an MABR tank water flow measuring instrument (23), a COD analyzer (24), NH are adopted4On-line monitoring data of the-N analyzer (25) is used as a feedforward parameter for calculating the aeration quantity of the aerobic tank and is transmitted to a data processing unit of an aeration PLC control system (1) for analysis to obtain the oxygen demand O of the aerobic tankoxic(ii) a Then, the online monitoring data of the aerobic tank middle section temperature measuring instrument (28), the pH measuring instrument (29), the MLSS analyzer (30) and the dissolved oxygen measuring instrument (27) are used as process parameters, the online monitoring data of the aerobic tank effluent COD analyzer (24) and the total nitrogen analyzer (31) are used as feedback parameters, and the optimal oxygen demand O of the aerobic tank is determinedoxicAnd (6) correcting.
Aeration oxygen demand and oxygen deficiency based on MABR tank and aerobic tankAn internal reflux optimization model of the pool adopts a neural network algorithm and adopts the water inlet NO of the anoxic pool3-N analyzer (20), MABR tank effluent NO3On-line monitoring data of the-N analyzer (20) is transmitted to a data processing unit of the aeration PLC control system (1) as a feedforward parameter for analysis to obtain an internal reflux quantity Qr(ii) a According to the online monitoring data of the MLSS analyzer (30) of the aerobic tank as the process parameters and the online monitoring data of the total nitrogen analyzer (31) at the tail end of the aerobic tank as the feedback parameters, the optimal internal reflux Q is obtainedrAnd (6) correcting and adjusting.
Water quality information analysis is collected by an aeration PLC control system (1) and a carbon source adding PLC control system (17), and after half-year aeration quantity and internal reflux quantity optimization control and operation implementation, the COD concentration of effluent is stabilized below 10mg/L, the total nitrogen concentration of the effluent ranges from 9.05mg/L to 11.53mg/L, the ammonia nitrogen concentration of the effluent is stabilized below 0.4mg/L, and the power consumption per ton of water is saved by about 10%.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. An aeration quantity and internal reflux quantity optimization control system based on an MABR process is characterized in that an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank are sequentially connected; an MABR pool is added between the anoxic pool and the aerobic pool; an online monitoring system is arranged on the MABR tank; the method is characterized in that: an online monitoring system is arranged on the biochemical treatment system based on the MABR technology, and NO is arranged at the water inlet end of the online monitoring system including the anoxic pond3A N analyzer (26), a flowmeter (23), a COD analyzer (24) and NH are arranged at the water outlet end of the anoxic tank4-an N analyzer (25); the middle section of the MABR tank is provided with a temperature measuring instrument (28), a pH measuring instrument (29), an MLSS analyzer (30) and a dissolved oxygen measuring instrument (27), and the tail end of the MABR tank is provided with NO3-N analyzer (26), effluent flow meter (23), effluent COD analyzer (24), effluent NH4-an N analyzer (25); the middle section of the aerobic tank is provided with a temperature measuring instrument (28), a pH measuring instrument (29), an MLSS analyzer (30) and a dissolved oxygen measuring instrument (27), and the tail end water outlet section of the aerobic tank is provided with a COD analyzer (24) and a total nitrogen analyzer (31);
an MABR aeration system is arranged on the MABR tank and comprises an MABR aeration process air blower (2), an air blower flow meter (3), an air blower automatic control valve (4) and an aeration process pipeline (5); the air blower flow meter (3) and the air blower automatic control valve (4) are arranged on the aeration process pipeline (5), and the MABR aeration process air blower (2) is arranged on the aeration process pipeline (5) and is electrically connected with the aeration PLC control system (1);
the aerobic tank is provided with an aerobic tank aeration system, and the aerobic tank aeration system comprises an aerobic tank aeration blower (13), a blower flow meter (14), a blower automatic control valve (15) and an aeration process pipeline (16); the air blower flow meter (14) and the air blower automatic control valve (15) are arranged on the aeration process pipeline (16), and the aerobic pool aeration air blower (13) is arranged on the aeration process pipeline (16) and is electrically connected with the aeration PLC control system (1);
an internal reflux system is arranged on the biochemical pool based on the MABR technology, and comprises an internal reflux pump (18), an internal reflux flowmeter (19) and an internal reflux pipeline (20); the internal reflux pump (18) and the internal reflux flowmeter (19) are arranged on the internal reflux pipeline (20) and are electrically connected with the internal reflux PLC control system (17); the internal reflux flow meter (19) is used for recording the internal reflux flow;
an excess sludge discharge system is arranged on the biochemical pool based on the MABR technology, and comprises an excess sludge pump (32), an excess sludge flowmeter (33), an excess sludge MLSS analyzer (30) and an excess sludge discharge pipeline (34); the excess sludge pump (32), the excess sludge flow meter (33) and the excess sludge MLSS analyzer (30) are arranged on the excess sludge discharge pipeline (34), and the excess sludge flow meter (33) and the excess sludge MLSS analyzer (30) are electrically connected with the aeration PLC control system (1);
the biochemical pool based on the MABR technology is provided with an external sludge return system, and the external sludge return system comprises an external return pump (21) and an external return pipeline (22);
an outer return pump (21) is arranged on an outer return pipeline (22) from the bottom of the sedimentation tank to the front end of the anaerobic tank.
2. The MABR process-based aeration and internal reflux optimization control system according to claim 1, wherein: the aeration PLC control system (1) is also connected with an MABR biological film scrubbing air blower (6), and the MABR biological film scrubbing air blower (6) is connected with an MABR pool through a scrubbing air blower flow meter (7), a scrubbing air blower automatic control valve (8) and a scrubbing air pipeline (9).
3. The MABR process-based aeration and internal reflux optimization control system according to claim 2, wherein: the aeration PLC control system (1) is also connected with an MABR stirring blower (10), and the MABR stirring blower (10) is connected with an MABR pool through an automatic stirring blower control valve (11) and a stirring air pipeline (12).
4. The MABR process-based aeration and internal reflux optimization control system according to claim 3, wherein: the MABR aeration process air blower (2), the MABR biofilm scrubbing air blower (6), the MABR stirring air blower (10) and the aerobic tank aeration air blower (13) are all frequency conversion type air blowers and are provided with frequency converters.
5. The MABR process-based aeration and internal reflux optimization control system according to claim 1, wherein: the internal reflux pump and the excess sludge pump adopt variable frequency pumps and are provided with frequency converters.
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