CN111847634A - Aeration and carbon source adding optimization control system and method for sludge-membrane composite sewage treatment process - Google Patents
Aeration and carbon source adding optimization control system and method for sludge-membrane composite sewage treatment process Download PDFInfo
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Abstract
The invention discloses an aeration and carbon source adding optimization control system and a method for a sludge-membrane composite sewage treatment process, which are mainly applied to a continuous flow municipal sewage treatment process, and the control system comprises: the system comprises an online monitoring system, an aeration PLC control system, a carbon source adding system and a carbon source adding PLC control system. By collecting online monitoring data of the water inlet of the biochemical pool as a feedforward parameter, online monitoring data of the course of the biochemical pool as a process parameter and online monitoring data of the tail end of the biochemical pool as a feedback parameter, a neural network algorithm is utilized to obtain a reduction and optimized aeration and carbon source adding control strategy. The system and the method are suitable for reducing aeration energy consumption and external carbon source drug consumption under different water inlet load conditions, particularly low water inlet load conditions, and simultaneously ensure COD, TN and NH4And the effluent of-N reaches the standard. The invention is suitable for sewage treatment of various scalesFactories and upgraded and modified sewage treatment plants; the method has obvious effects of saving energy and reducing consumption and reducing the addition of the carbon source, and can obtain larger benefits of saving energy and reducing consumption and reducing the addition of the carbon source through small transformation according to the automatic control conditions of the water plant.
Description
Technical Field
The invention belongs to the fields of sewage treatment technology and energy-saving consumption-reducing control, and particularly relates to an aeration and carbon source adding optimization control method for a sludge-membrane composite sewage treatment process.
Background
The sewage treatment plant is a key ring for eliminating urban black and odorous water. Along with the popularization of the primary A standard in the pollutant discharge Standard of urban wastewater treatment plants (GB 18918-2002) and the overall conversion from scale increase to upgrading efficiency improvement of urban wastewater treatment, the method also faces the increase of operation energy consumption and dosing drug consumption.
The addition of suspended fillers into the aerobic tank is one of the more common upgrading and reforming modes of sewage treatment plants. The microorganism can be attached to the filler to form a biological film, and the biological film and the suspended activated sludge form a sludge film composite sewage treatment process. The suspended filler can provide more proper growth conditions for the nitrifying bacteria, so that the nitrifying bacteria are enriched on the biological membrane, the sludge age is prolonged, and the problems of low proliferation rate and low activity of the nitrifying bacteria in the activated sludge in winter are solved. Therefore, the sludge-film composite sewage biological treatment system can shorten the nitrification reaction time of the aerobic tank, and further shorten the aeration time of the aerobic tank. If a constant aeration strategy is adopted, unnecessary aeration quantity and aeration time can be increased and prolonged, and meanwhile, COD in the return nitrification liquid can be consumed by excessive aeration, so that insufficient carbon source is generated in the denitrification process, and further, the carbon source adding quantity needs to be additionally increased to ensure that the TN of the effluent reaches the standard, and the medicament adding cost is increased. Aiming at the problems, the aeration strategy and the carbon source adding strategy of the sludge-membrane composite sewage treatment process need to be optimally controlled according to the actual water quality condition and the operation parameters.
Disclosure of Invention
The invention aims to provide an aeration and carbon source adding optimization control system and method for a sludge-membrane composite sewage treatment process. Aiming at the problems that the sewage treatment plant has high aeration energy consumption and high carbon source adding cost and increases the carbon footprint of the sewage treatment plant, a control system from 'aeration control on demand' to 'carbon source adding reduction control' is established by adopting a method of combining data simulation analysis and process parameter evaluation, and the aim is to optimize an aeration system and a carbon source adding system of a sewage biological treatment process and realize the reduction and optimization of aeration and carbon source adding.
The purpose of the invention is realized by the following technical scheme:
an aeration and carbon source adding optimization control system for a sludge-membrane composite sewage treatment process is characterized by comprising an online monitoring system, an aeration PLC control system, a carbon source adding system and a carbon source adding PLC control system.
The on-line monitoring system comprises a temperature measuring instrument, a pH measuring instrument, a flow measuring instrument, an MLSS analyzer, a DO measuring instrument, an ORP measuring instrument, a COD analyzer and NH4-N analyzer, NO3-N analyzer, TKN analyzer and TN analyzer. Wherein, the water inlet end of the biochemical pool is provided with a water inlet flow measuring instrument, a COD analyzer and NH 4-an N analyzer and a TKN analyzer; an internal reflux flowmeter, an ORP (oxidation-reduction potential) measurer, a DO measurer, a COD (chemical oxygen demand) analyzer and NO are arranged at the front end of the anoxic tank3-an N analyzer; the front, middle and end sections of the aerobic tank are provided with a DO measuring instrument, a COD analyzer and NH4-N analyzer and NO3An N analyzer, a temperature measuring instrument, a pH measuring instrument and an MLSS analyzer are arranged in the middle section of the aerobic tank, and the tail end of the aerobic tank is provided withTN Analyzer and NH4-an N analyzer. And instruments of the on-line monitoring system are electrically connected with the aeration PLC and the carbon source adding PLC control system.
In the aeration control system, an on-line monitoring system of a water inlet tank, an anoxic tank and an aerobic tank is connected with an aeration PLC control system, an automatic aeration control valve is arranged at the tail end of an aeration pipeline, an air blower and the automatic aeration control valve are connected with the PLC control system, and the air blower is connected with the aeration pipeline.
In the carbon source adding control system, an online monitoring system of a water inlet tank, an anoxic tank and an aerobic tank is connected with a carbon source adding PLC control system, a carbon source adding pump and a flow meter are connected with the carbon source adding PLC control system, and meanwhile, the carbon source adding pump and the flow meter are connected with a medicine adding pipeline.
The blower is a variable frequency blower; the carbon source feeding pump, the internal reflux pump and the sludge reflux pump adopt variable frequency pumps.
The invention also provides an aeration and carbon source adding optimization control method for the sludge-membrane composite sewage treatment process, which is characterized by comprising the following steps of:
1. aeration control method
By means of inflow measuring instruments (Q)in) Water inflow COD analyzer and water inflow NH4On-line monitoring data of an N analyzer is used as a feedforward parameter, based on an aeration oxygen demand prediction model, the oxygen demand of the aerobic pool is calculated by using a neural network algorithm, and the formula is as follows:
FO＝QinSiCOD[(1-YH)+(1-fH)bH]+4.57QinNan(1)
in the formula (1), FO is the oxygen demand of the aerobic tank per day and mg O2/d；QinIs the water inlet flow, L/d; siCODThe COD concentration of the inlet water is mg COD/L; y isHThe yield coefficient of heterotrophic bacteria is mg COD/mg COD; f. ofHIs a heterotrophic bacteria non-biodegradable component, mgCOD/mg COD; bHD + rate of endogenous consumption of heterotrophic bacteria1；NanFor feeding water NH4Concentration of-N, mgNH4-N/L。
Suspended sewage is added into the aerobic tank under different conditionsThere are differences in the microbial structure and abundance of mud and biofilm. According to the temperature measuring instrument, the pH measuring instrument, the MLSS analyzer, the COD analyzer and the NH in the aerobic tank4-N analyzer, NO3On-line monitoring data of the N analyzer and the DO measuring instrument, and the anoxic tank ORP measuring instrument and the DO measuring instrument are used as process parameters, and NH at the tail end of the aerobic tank is used as the process parameters4On-line monitoring data of the-N analyzer is used as a feedback parameter, and the FO oxygen demand obtained by feedforward calculation is adjusted and corrected to obtain corrected oxygen demand FO adj。
Further, FO is based on the corrected oxygen demandadjAnd the aeration of the aerobic tank is alternatively controlled in time period by adjusting the starting and stopping frequency of the air blower and the opening of the automatic aeration control valve through the PLC control system. According to the dissolved oxygen concentration of the aerobic tank, the aerobic tank is divided into a nitrification stage and a denitrification stage. Wherein the dissolved oxygen concentration in the nitrification stage is controlled to be 1-1.5 mg/L, and the dissolved oxygen concentration in the denitrification stage is controlled to be lower than 0.3 mg/L.
2. Carbon source adding control method
Adopting a C/N ratio obtained by calculating the online monitoring data of a water inflow COD analyzer and a water inflow TKN analyzer as a first feedforward parameter: if C/N is more than 5, the carbon source adding control system is not started; if the C/N is less than 5, starting a carbon source adding system, and calculating and controlling according to the subsequent steps.
Further, a COD analyzer at the front end of the anoxic tank and NO are adopted3-N analyzer and internal reflux flowmeter (Q)r) On-line monitoring data is used as a second feedforward parameter, the carbon source adding amount is calculated by utilizing a neural network algorithm on the basis of a carbon source adding amount prediction model, and the formula is as follows:
FC＝SaddQr(3)
in the formula (2), SaddThe carbon source concentration is added, mg COD/L; saCODThe COD concentration at the front end of the anoxic tank is mg COD/L; sNO3-NIs NO at the front end of the anoxic pond 3Concentration of-N, mgNO3-N/L；YHAs a yield coefficient, mg COD/mg COD. In the formula (3), FC is the adding amount of the carbon source per day, mg COD/d; qrThe internal reflux amount is L/d.
Further, the carbon source adding amount is corrected by taking the online monitoring data of the ORP measuring instrument as a process parameter and the online monitoring data of a TN analyzer at the tail end of the aerobic pool as a feedback parameter to obtain the corrected carbon source adding amount FCadj。
Further, according to the corrected carbon source addition amount FCadjAnd the start, the stop and the frequency of the dosing pump are adjusted by a carbon source dosing PLC system.
3. Aeration and carbon source adding combined optimization control method
According to the formulae (1) to (3), COD and NH are used4and-N is used as an intermediate parameter to jointly optimize aeration quantity and carbon source adding quantity. When water is fed in C/N<And 5, further calculating according to the formula (4) by utilizing a neural network algorithm based on the aeration oxygen demand and the carbon source addition prediction model:
in formula (4), FOoptIs based on FOadjAeration of (2), usually FOopt＝FOadj，mg O2/d；FCoptThe optimized carbon source adding amount is mg COD/d; COD and NH in the matrix4N is COD and NH at the tail end of the aerobic tank4-N concentration, mg/L; and a, b and c in the matrix are adjustment coefficients based on temperature, MLSS, pH, DO and ORP in the biochemical pool.
Further, the start-stop and frequency of the air blower, the opening of the automatic aeration control valve and the start-stop and frequency of the dosing pump are adjusted by a combined aeration PLC and carbon source dosing PLC control system.
Compared with the prior art, the invention has the advantages that: (1) the aerobic tank is added with the suspended filler, so that the proliferation and enrichment of nitrifying bacteria on a biological membrane are facilitated, the time required by an aeration/nitrification stage is further shortened, the capacity of a denitrification tank of a biochemical tank can be increased, the time of the denitrification stage can be prolonged and the denitrification effect is optimized after the aerobic tank is divided into the nitrification stage and the denitrification stage in time sequence; (2) the aerobic tank is divided into a nitrification stage and a denitrification stage in time sequence, so that the aeration energy consumption can be reduced; (3) the aeration time of the aerobic tank is shortened, more carbon sources in the internal reflux can be reserved, and the addition amount of the carbon sources is saved; (4) the aeration system and the carbon source adding system are controlled in a combined mode, balance points can be provided for aeration quantity and carbon source adding quantity, and energy-saving and consumption-reducing benefits of a water plant are obtained through simple and easy operation.
Drawings
FIG. 1 is a schematic diagram of an aeration and carbon source addition optimization control system provided by an embodiment of the present invention.
In fig. 1: 1. flowmeter, 2 Total Kjeldahl Nitrogen (TKN) analyzer, 3 COD analyzer, 4 NH4-N analyzer, 5, NO3-N analyzer, 6, Oxidation Reduction Potential (ORP) meter, 7, Dissolved Oxygen (DO) meter, 8, temperature meter, 9, pH meter, 10, MLSS meter, 11, TN analyzer, 12, internal reflux pump, 13, internal reflux line, 14, sludge reflux pump, 15, sludge reflux line, 16, aeration PLC, 17, blower, 18, aeration line, 19, aeration automatic control valve, 20, carbon source storage tank, 21, carbon source feeding pump, 22, carbon source feeding line, 23, flowmeter, 24, carbon source feeding PLC.
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 and carbon source adding control system and method, and the applied process running conditions are as follows: the treatment scale of a certain urban sewage treatment plant is 3 ten thousand tons/day, the biochemical pool adopts an A/A/O process, wherein suspended fillers are added into an O section, the biochemical pool is divided into two groups, each group of aerobic pool is divided into two aeration galleries, and the effluent quality meets the standard A of the first-level standard in discharge Standard of pollutants for urban sewage treatment plants.
As shown in figure 1, the aeration and carbon source adding control system is provided with an on-line monitoring system. The water inlet end of the biochemical pool is provided with a water inlet flow measuring instrument (1), a TKN analyzer (2), a COD analyzer (3) and NH4-an N analyzer (4). The front end of the anoxic tank is provided with a COD analyzer (3) and NO3An N analyzer (5), an internal reflux flowmeter (1), an ORP measuring instrument (6) and a DO measuring instrument (7), and records the data of the internal reflux water quality. The front, middle and tail ends of the aerobic tank are respectively provided with a COD analyzer (3) and NH4-N analyzer (4), NO3An N analyzer (5) and a DO measuring instrument (7) for recording water quality data of the aerobic pool along the process; the middle end of the aerobic tank is provided with a temperature measuring instrument (8), a pH measuring instrument (9) and an MLSS measuring instrument (10) for recording the sludge state and the reaction state in the aerobic tank; and a TN measuring instrument (11) is arranged at the tail end of the aerobic tank and used for recording TN removal condition of the biochemical tank.
An aeration and carbon source adding control system is provided with an internal reflux system: an internal reflux pump (12) and an internal reflux line (13). The internal reflux pump (12) is arranged on the internal reflux pipeline (13) and is electrically connected with the aeration and carbon source adding PLC control systems (16 and 19) so as to control the internal reflux amount.
An aeration and carbon source adding control system, wherein the aeration system arranged on the system comprises: the aeration device comprises a blower (17), an aeration pipeline (18) and an automatic aeration control valve (19), wherein the automatic aeration control valve (19) is arranged on the aeration pipeline (18), and the blower (17) and the automatic aeration control valve (19) are electrically connected with an aeration PLC control system (16).
An aeration and carbon source adding control system, wherein a carbon source adding system is arranged on the system, and comprises: the carbon source feeding device comprises a carbon source storage tank (20), a carbon source feeding pump (21), a carbon source feeding pipeline (22) and a flow meter (23), wherein the flow meter (23) is installed on the carbon source feeding pipeline (22), and the carbon source feeding pump (21) and the flow meter (23) are electrically connected with a carbon source feeding PLC control system (24).
Based on the aeration oxygen demand and carbon source adding amount model of the sewage biological treatment, a neural network algorithm is utilized, and a biochemical pool water inlet end flow measuring instrument (1), a COD analyzer (3) and NH are adopted4On-line monitoring data of the-N analyzer (4) is used as an aeration feedforward parameter, on-line monitoring data of a biochemical pool water inlet end COD analyzer (3) and a TKN analyzer (2) is used as a carbon source adding first feedforward parameter, and an anoxic pool front end internal reflux flow meter (1), a COD analyzer (3) and an NO analyzer (2) are used 3-N analyzer (5) as a carbon source for adding a second feed forward parameter, divideRespectively transmitted to the aeration PLC control system (16) and the carbon source adding PLC control system (24) for analysis to obtain the feedforward aeration oxygen demand FO and the feedforward carbon source adding amount FC. Then according to DO measuring instruments (7), COD analyzers (3) and NH collected along the way at the front end, the middle end and the tail end of the aerobic tank4-N analyzer (4) and NO3On-line monitoring data of the-N analyzer (5) and on-line monitoring data of the anoxic tank ORP measuring instrument (6) and the DO measuring instrument (7) are transmitted to a data processing unit of the aeration PLC control system (16) as process parameters, and the FO is corrected to obtain the FOadj. Transmitting the on-line monitoring data of the TN analyzer (11) at the end section of the aerobic tank as feedback parameters to a data processing unit of a carbon source adding PLC control system (24), correcting the FC to obtain the FCadj. Finally, a COD analyzer (3) and NH of the biochemical pool are used4On-line monitoring data of the-N analyzer (4) is used as an intermediate parameter and jointly transmitted to a data processing unit of an aeration PLC control system (16) and a carbon source adding PLC control system (24) to process the FOadjAnd FCadjOptimized to respectively obtain FOoptAnd FCopt. The collected online monitoring data of the temperature measuring instrument (8), the pH measuring instrument (9) and the MLSS analyzer (10) are used as the basis of the model matrix adjustment coefficient.
According to the corrected and optimized aeration oxygen demand FOoptAnd carbon source addition amount FCoptAnd a corresponding control strategy is that an aeration PLC control system (16) is used for adjusting the starting and stopping of an air blower (17), the frequency and the switching of an aeration automatic control valve (19), and the aerobic tanks are distributed into a nitrification stage and a denitrification stage on a time sequence, wherein the time interval between the nitrification stage and the denitrification stage is 2h, namely the nitrification stage is 2h and the denitrification stage is 2 h. Wherein the concentration of dissolved oxygen in the nitrification stage is controlled to be 1-1.5 mg/L, and the concentration of dissolved oxygen in the denitrification stage is controlled to be lower than 0.3 mg/L. The carbon source adding PLC control system (24) is used for adjusting the starting, the stopping and the frequency of the carbon source adding pump (21), and adding the additional carbon source according to the requirement.
The aeration PLC control system (16) and the carbon source adding PLC control system (24) collect the information analysis of the water quality of the inlet water, and after the aeration and carbon source adding optimization control and implementation for 3 months, the TN of the outlet water is reduced to 6.9mg/L from 12-14 mg/L, and the NH of the outlet water4The concentration of-N is stably kept at about 0.4 mg/L. Native to the originalThe amount of the extra carbon source added into the chemical system is about 63mg/L, after aeration and carbon source addition combined optimization control, the addition of the carbon source is stopped, and the effluent TN stably reaches the standard and is discharged.
The above description is only for the preferred embodiment of the present invention, but the 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 included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. An aeration and carbon source adding optimization control system for a sludge-membrane composite sewage treatment process is characterized in that: the system comprises an online monitoring system, an aeration PLC control system, a carbon source adding system and a carbon source adding PLC control system;
the on-line monitoring system comprises a temperature measuring instrument, a pH measuring instrument, a flow measuring instrument, an MLSS analyzer, a DO measuring instrument, an ORP measuring instrument, a COD analyzer and NH4-N analyzer, NO3-an N analyzer, a TKN analyzer and a TN analyzer; wherein, the water inlet end of the biochemical pool is provided with a water inlet flow measuring instrument, a COD analyzer and NH4-an N analyzer and a TKN analyzer; an internal reflux flowmeter, an ORP (oxidation-reduction potential) measurer, a DO measurer, a COD (chemical oxygen demand) analyzer and NO are arranged at the front end of the anoxic tank3-an N analyzer; the front, middle and end sections of the aerobic tank are provided with a DO measuring instrument, a COD analyzer and NH4-N analyzer and NO3An N analyzer, a temperature measuring instrument, a pH measuring instrument and an MLSS analyzer are arranged in the middle section of the aerobic tank, and a TN analyzer and an NH analyzer are arranged at the tail end of the aerobic tank4-an N analyzer; instruments of the on-line monitoring system are electrically connected with the aeration PLC and the carbon source adding PLC control system;
in the aeration control system, an online monitoring system of a water inlet tank, an anoxic tank and an aerobic tank is connected with an aeration PLC, an automatic aeration control valve is arranged at the tail end of an aeration pipeline, a blower and the automatic aeration control valve are connected with the aeration PLC, and the blower is connected with the aeration pipeline;
In the carbon source adding control system, an online monitoring system of a water inlet tank, an anoxic tank and an aerobic tank is connected with a carbon source adding PLC, a carbon source adding pump and a flow meter are connected with the carbon source adding PLC, and the carbon source adding pump and the flow meter are connected with an adding pipeline.
2. The aeration and carbon source adding optimization control method for the sludge-membrane composite sewage treatment process by utilizing the system of claim 1 is characterized in that: by means of inflow measuring instruments QinWater inflow COD analyzer and water inflow NH4On-line monitoring data of an N analyzer is used as a feedforward parameter, based on an aeration oxygen demand prediction model, the oxygen demand of the aerobic pool is calculated by using a neural network algorithm, and the formula is as follows:
FO＝QinSiCOD[(1-YH)+(1-fH)bH]+4.57QinNan(1)
in the formula (1), FO is the oxygen demand of the aerobic tank per day and mg O2/d；QinIs the water inlet flow, L/d; siCODThe COD concentration of the inlet water is mg COD/L; y isHThe yield coefficient of heterotrophic bacteria is mg COD/mg COD; f. ofHIs a heterotrophic bacteria non-biodegradable component, mg COD/mgCOD; bHThe rate of endogenous consumption of heterotrophic bacteria, d-1; n is a radical ofanFor feeding water NH4Concentration of-N, mg NH4-N/L。
3. The aeration and carbon source adding optimization control method for the sludge-membrane composite sewage treatment process according to claim 2, which is characterized by comprising the following steps of: according to the temperature measuring instrument, the pH measuring instrument, the MLSS analyzer, the COD analyzer and the NH in the aerobic tank 4-N analyzer, NO3On-line monitoring data of an N analyzer and a DO measuring instrument, and an anoxic tank ORP measuring instrument and a DO measuring instrument are used as process parameters, and NH at the tail end of the aerobic tank is used4On-line monitoring data of the-N analyzer is used as a feedback parameter, and the FO oxygen demand obtained by feedforward calculation is adjusted and corrected to obtain corrected oxygen demand FOadj。
4. The aeration and carbon for the sludge-membrane composite sewage treatment process according to claim 2The source addition optimization control method is characterized by comprising the following steps: according to corrected oxygen demand FOadjThe start-stop and frequency of the air blower and the opening degree of the automatic aeration control valve are adjusted by the PLC control system, so that the time period alternative control of the aeration of the aerobic tank is realized; dividing the aerobic pool into a nitrification stage and a denitrification stage according to the dissolved oxygen concentration of the aerobic pool; the dissolved oxygen concentration in the nitrification stage is controlled to be 1-1.5 mg/L, and the dissolved oxygen concentration in the denitrification stage is controlled to be lower than 0.3 mg/L.
5. The aeration and carbon source adding optimization control method for the sludge-membrane composite sewage treatment process according to claim 2, which is characterized by comprising the following steps of: adopting a C/N ratio obtained by calculating the online monitoring data of a water inflow COD analyzer and a water inflow TKN analyzer as a first feedforward parameter: if C/N is more than 5, the carbon source adding control system is not started; if the C/N is less than 5, starting a carbon source adding system for control;
Adopts a COD analyzer at the front end of the anoxic tank and NO3-N analyzer and internal reflux flow measurement QrOn-line monitoring data is used as a second feedforward parameter, the carbon source adding amount is calculated by utilizing a neural network algorithm on the basis of a carbon source adding amount prediction model, and the formula is as follows:
FC＝SaddQr(3)
in the formula (2), SaddThe carbon source concentration is added, mg COD/L; saCODThe COD concentration at the front end of the anoxic tank is mg COD/L; sNO3-NIs NO at the front end of the anoxic pond3Concentration of-N, mgNO3-N/L；YHAs yield coefficient, mg COD/mg COD; in the formula (3), FC is the adding amount of the carbon source per day, mg COD/d; qrThe internal reflux amount is L/d.
6. The aeration and carbon source adding optimization control method for the sludge-membrane composite sewage treatment process according to claim 5, which is characterized by comprising the following steps of: on-line monitoring data of ORP measuring instrument is used as process parameter, and the tail end of the aerobic tankThe TN analyzer on-line monitoring data is used as a feedback parameter to correct the carbon source adding amount to obtain the corrected carbon source adding amount FCadj。
7. The aeration and carbon source adding optimization control method for the sludge-membrane composite sewage treatment process according to claim 5, which is characterized by comprising the following steps of: according to the corrected carbon source adding amount FCadjAnd the start, the stop and the frequency of the dosing pump are adjusted by a carbon source dosing PLC system.
8. The aeration and carbon source adding optimization control method for the sludge-membrane composite sewage treatment process according to claim 5, which is characterized by comprising the following steps of: the aeration and carbon source adding combined optimization control method comprises the following steps of adopting COD and NH 4N is used as an intermediate parameter to jointly optimize aeration quantity and carbon source adding quantity; when water is fed in C/N<And 5, calculating according to the formula (4) by utilizing a neural network algorithm based on the aeration oxygen demand and carbon source addition prediction model:
in formula (4), FOoptIs based on FOadjAeration of (2), usually FOopt＝FOadj，mg O2/d；FCoptThe optimized carbon source adding amount is mg COD/d; COD and NH in the matrix4N is COD and NH at the tail end of the aerobic tank4-N concentration, mg/L; and a, b and c in the matrix are adjustment coefficients based on temperature, MLSS, pH, DO and ORP in the biochemical pool.
9. The aeration and carbon source adding optimization control method for the sludge-membrane composite sewage treatment process according to claim 8, which is characterized by comprising the following steps of: the start-stop and frequency of the blower, the opening of the automatic aeration control valve and the start-stop and frequency of the dosing pump are adjusted by the joint aeration PLC control system and the carbon source dosing PLC control system.
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