A sewage treatment load balancing feedback water distribution system and method

Abstract

The present invention belongs to the technical field of sewage treatment, and discloses a sewage treatment load-balanced feedback water distribution system and method. The system includes: at least one lifting pump, at least one water distribution well, a phased sand removal tank, a series of treatment modules, a unit biological pool, a series of secondary sedimentation tanks, and a control subsystem. The present invention realizes balanced hydraulic load distribution in time and space, realizes multi-stage linkage of the system's total water inflow, each phase, each series, and each biological pool unit, and coordinated control of sewage sludge pre-feedback stratified regulation of water distribution, ensures balanced system microbial activity from three aspects: sludge concentration, biological pool inflow load, and aerobic pool DO, enhances biological reaction efficiency, and ensures that the overall biological denitrification and phosphorus removal system is in an efficient and stable state, which is of great significance to the stable operation of the sewage treatment unit.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and more specifically, relates to a sewage treatment load balancing feedback water distribution system and method. Background Art

[0002] The influent of large-scale sewage treatment plants is distributed to each parallel treatment unit through the water distribution system. Due to the differences in the resistance of the inlet pipes of each unit and the hydraulic characteristics of the fluid, the water distribution of each unit in the sewage treatment plant is prone to uneven water volume. Due to the large fluctuations in the influent water volume of the sewage treatment system, the short-term overload of the biological pool causes a large deviation between the actual operating conditions and the design; the uneven water distribution of each series causes the overload of some biological units, the activated sludge concentration is too low, and the process control of parameters such as dissolved oxygen is difficult, which restricts the optimal treatment efficiency of the whole plant, resulting in a series of problems such as large land occupation, high investment, and high operating costs, which seriously affect the investment benefits. The traditional water distribution method usually uses an inlet weir or an inlet gate to distribute the influent, resulting in uneven water distribution in each series, exacerbating the difference in aeration intensity of each unit. Both insufficient and excessive aeration will affect the activity of microorganisms; in addition, the traditional sludge return distribution method generally uses each biological pool to separately infuse sludge, further increasing the uneven F / M load of each unit. Excessive and low F / M loads will affect the activity of microorganisms and treatment effects, thereby restricting the overall treatment efficiency of the water plant.

[0003] Therefore, it is urgent to propose a sewage treatment load balancing feedback water distribution system and method, which has important practical significance for improving operation effect and reducing aeration energy consumption. Summary of the invention

[0004] The purpose of the present invention is to propose a sewage treatment load balancing feedback water distribution system and method in view of the deficiencies of the prior art. The present invention realizes balancing the biological pool treatment load in each time period, adjusts the water distribution between each series and each pool group, forms a multi-stage linkage water distribution technology, and effectively eliminates the problem of uneven water distribution in each unit. Combining parameters such as sludge concentration and treatment load as the basis for regulation, while taking into account the linkage scheduling of some pool groups in the biochemical pool that are regularly overhauled every year, the treatment capacity of each pool group is fully utilized to stabilize the effluent water quality.

[0005] In order to achieve the above-mentioned object, the present invention provides a sewage treatment load balancing feedback water distribution system, the system comprising: at least one pump, at least one water distribution well, a phased sand removal tank, a series of treatment modules, a unit biological pool, a series of secondary sedimentation tanks, and a control subsystem;

[0006] The outlet pipeline of the lifting pump is connected to the water distribution well, the outlet pipeline of the water distribution well is connected to each phase of the desanding tank, the outlet pipeline of each phase of the desanding tank is connected to at least one series processing module, and the outlet pipeline of each series processing module is connected to at least one biological pool unit;

[0007] A flow control unit before the desander is provided on the water inlet pipe of each desander; a flow control unit for the desander blower is provided on the air inlet pipe of each desander;

[0008] Each series of treatment modules includes a primary sedimentation tank, a mixing tank, a pre-anoxic tank, an anaerobic tank and a water distribution channel;

[0009] A flow control unit before the primary sedimentation tank is provided in front of each primary sedimentation tank; the outlet pipeline of each desander tank is divided into two routes, one of which is connected to the primary sedimentation tank through the main flow control unit after the desander tank and the flow control unit before the primary sedimentation tank in sequence, and the other is connected to the mixing tank, pre-anoxic tank and anaerobic tank in sequence through the branch flow control unit after the desander tank; the outlet pipeline of the primary sedimentation tank is divided into two routes, one of which is connected to the anaerobic tank through the main flow control unit after the primary sedimentation tank, and the other is connected to the water distribution channel through the branch flow control unit after the primary sedimentation tank; each biological pool unit includes an anoxic tank, an aeration tank and a deoxygenation tank connected in sequence; a flow control unit after the water distribution channel is provided in front of each anoxic tank; the water distribution channel is provided after the anaerobic tank, and the anaerobic tank is connected to the water distribution channel, the flow control unit after the water distribution channel and the anoxic tank in sequence;

[0010] The outlet pipe of the deoxygenation tank is divided into two routes, one of which is connected to the secondary sedimentation tank, and the other is connected to the anoxic tank of the same unit through an internal reflux flow control unit; the bottom of the secondary sedimentation tank is connected to the mixing tank through an external reflux flow control unit;

[0011] The aeration tank is provided with an aeration tank blower flow control unit and a sludge concentration meter;

[0012] The control subsystem is connected with each control unit and the sludge concentration meter respectively.

[0013] According to the present invention, preferably, the mixing tank and the pre-anoxic tank are combined into one tank or are separately provided.

[0014] According to the present invention, preferably, the system further comprises a plurality of series of outlet channels, and the outlet pipes of the deoxygenation tanks are collected in the outlet channels and further connected to the secondary sedimentation tank.

[0015] According to the present invention, preferably, the number of phases of the phased sand removal pool is 2-n; the outlet pipe of each phase of the sand removal pool is connected to 2-n series processing modules, and the outlet pipe of each series processing module is connected to 2-n biological pool units.

[0016] Another aspect of the present invention provides a sewage treatment load balancing feedback water distribution method, the method adopts the above system and comprises the following steps:

[0017] (1) The total incoming water is lifted to the water distribution well by the pumping pump for water distribution in each period; the control subsystem performs data analysis and control on the water distribution status of the system at preset time intervals;

[0018] (2) In the water distribution of the desander, the control subsystem controls the water distribution of the desander through the flow control unit before the desander, and supplies air to the desander through the flow control unit of the desander blower. The control can choose to adopt the first constant water volume operation mode, the first proportional control mode or the air-water ratio control mode;

[0019] The first constant water volume operation mode includes: setting the water volume of each desanding tank through the control subsystem, and adjusting the flow control unit and the pumping pump in front of the desanding tank in sequence by the control subsystem, so that the water volume of each desanding tank is within the range of ±n1% of the preset water volume, where n1% is a preset error;

[0020] The first proportional control mode includes: collecting water flow data of the flow control unit in front of each desanding pool through the control subsystem and setting the water distribution ratio of each desanding pool, and adjusting the water volume by using the flow control unit in front of each desanding pool so that the water distribution ratio between the desanding pools in each period is within the range of ±n2% of the preset ratio, where n2% is a preset error;

[0021] The gas-water ratio control mode includes: the control subsystem calculates the gas-water ratio of each desander according to the gas flow data and water flow data input into the control subsystem by the desander blower flow control unit and the desander front flow control unit; the control subsystem sets the upper limit A2 and lower limit A1 of the gas-water ratio of each desander, as well as the minimum value Q1 and maximum value Q2 of the water distribution of each desander; when A1≤the calculated gas-water ratio of the desander≤A2, the water distribution of the desander in the subsystem of this period is kept unchanged; when the desander is When the calculated value of the gas-water ratio of the desander pool is less than A1, the control subsystem is used to adjust the corresponding flow control unit in front of the desander pool to thereby reduce the water distribution volume of the desander pool until the water distribution volume of the desander pool is as low as the minimum value Q1, and the water distribution volume of the minimum value Q1 is kept unchanged; when the calculated value of the gas-water ratio of the desander pool is greater than A2, the control subsystem is used to adjust the corresponding flow control unit in front of the desander pool to thereby increase the water distribution volume of the desander pool until the water distribution volume of the desander pool is as high as the maximum value Q2, and the water distribution volume of the maximum value Q2 is kept unchanged;

[0022] (3) In the water distribution of the primary sedimentation tank, the control subsystem controls the water distribution of the primary sedimentation tank through the flow control unit before the primary sedimentation tank, and the control can choose to adopt the second constant water volume operation mode, the second proportional control mode or the surface load control mode;

[0023] The second constant water volume operation mode includes: setting the water distribution volume of the primary settling tank in each series processing module by the control subsystem, and adjusting the flow control unit before the primary settling tank by the control subsystem so that the water distribution volume of each primary settling tank is within the range of ±n3% of the preset water volume, where n3% is a preset error; after the flow control unit before the primary settling tank is adjusted, the excess water from the desanding tank enters the mixing tank through the branch pipe flow control unit after the desanding tank;

[0024] The second proportional control mode includes: collecting water flow data of the flow control unit before each primary sedimentation tank and the start and stop data of the subsequent biological pool unit connected to the primary sedimentation tank through the control subsystem, and setting the water distribution ratio of each primary sedimentation tank, and using the control subsystem to adjust the flow control unit before the primary sedimentation tank in each sub-series processing module according to the calculation result of formula 1, so that the water distribution ratio between the primary sedimentation tanks in each sub-series processing module is within the preset ratio ±n4%, and n4% is a preset error; Formula 1 is (M w +M j *M a )=M e , where: M e is the water distribution ratio of a certain primary sedimentation tank; M w M is the water flow data of the corresponding flow control unit before the primary sedimentation tank; a M is the number of subsequent biological pool units that are shut down and connected to the primary sedimentation tank; j is a coefficient, preferably, the coefficient is 0.3-0.6;

[0025] The surface load control mode includes: the control subsystem calculates the surface load of the primary sedimentation tank in each sub-series processing module according to the water flow data input into the control subsystem by the flow control unit before the primary sedimentation tank; the control subsystem sets the upper limit B2 and lower limit B1 of the surface load of the primary sedimentation tank in each sub-series processing module, as well as the minimum value Q4 and maximum value Q3 of the water distribution volume of the primary sedimentation tank in each sub-series processing module; when B1≤the calculated value of the surface load of the primary sedimentation tank≤B2, the water distribution volume of the primary sedimentation tank is kept unchanged; when the primary sedimentation tank When the calculated value of the surface load of the primary sedimentation tank is less than B1, the control subsystem is used to adjust the corresponding flow control unit before the primary sedimentation tank to increase the water distribution volume of the primary sedimentation tank until the water distribution volume of the primary sedimentation tank reaches the maximum value Q3, and the water distribution volume of the maximum value Q3 is kept unchanged; when the calculated value of the surface load of the primary sedimentation tank is greater than B2, the control subsystem is used to adjust the corresponding flow control unit before the primary sedimentation tank to reduce the water distribution volume of the primary sedimentation tank until the water distribution volume of the primary sedimentation tank reaches the minimum value Q4, and the water distribution volume of the minimum value Q4 is kept unchanged;

[0026] After the flow control unit in front of the primary sedimentation tank is adjusted, the excess water from the desander tank enters the mixing tank through the branch pipe flow control unit after the desander tank;

[0027] (4) In the mixing tank, the return liquid from the bottom of the secondary sedimentation tank and the desander effluent from the branch flow control unit after the desander are mixed and sent to the pre-anoxic tank and the anaerobic tank in sequence;

[0028] (5) The effluent from the primary sedimentation tank in step (3) is divided into two routes, one of which is sent to the anaerobic tank through the main flow control unit after the primary sedimentation tank, and the other is sent to the water distribution channel and the flow control unit after the water distribution channel in sequence through the branch flow control unit after the primary sedimentation tank;

[0029] (6) sending the effluent of the anaerobic tank to the water distribution channel and the flow control unit after the water distribution channel in sequence, and sending the effluent of the flow control unit after the water distribution channel to the anoxic tank;

[0030] (7) In the water distribution of the anoxic pool, the control subsystem controls the water distribution of the anoxic pool through the flow control unit after the water distribution channel, and the control can choose to adopt the third constant water volume operation mode, the third proportional control mode or the second air-water ratio control mode;

[0031] The third constant water volume operation mode includes: setting the water volume of each anoxic pool by the control subsystem, and adjusting the flow control unit after the water distribution channel by the control subsystem so that the water volume of each anoxic pool is within the range of ±n5% of the preset water volume, where n5% is a preset error;

[0032] The third proportional control mode includes: collecting water flow data of the flow control unit after the water distribution channel connected in front of each anoxic pool by the control subsystem and setting the water distribution ratio of each anoxic pool, and adjusting the flow control unit after the water distribution channel connected in front of each anoxic pool by the control subsystem so that the water distribution ratio between the anoxic pools is within the range of ±n6% of the preset ratio, where n6% is the preset error;

[0033] The second air-water ratio control mode includes: the control subsystem calculates the air-water ratio of each aeration tank according to the air delivery data and water flow data input into the control subsystem by the aeration tank blower flow control unit and the water distribution channel rear flow control unit; the control subsystem sets the upper limit C2 and lower limit C1 of the air-water ratio of each aeration tank, and the minimum value Q5 and maximum value Q6 of the water distribution volume of each anoxic tank; when C1≤the air-water ratio calculated value of the aeration tank≤C2, the water distribution volume of the anoxic tank of the unit where the aeration tank is located is kept unchanged; when the air-water ratio calculated value of the aeration tank is less than C1 ... anoxic tank is located is kept unchanged; when the air-water ratio calculated value of the aeration tank is less than C1, the water distribution volume of the anoxic tank of the unit where the anoxic tank is located is kept unchanged; when the air-water ratio calculated value of The control subsystem is used to adjust the flow control unit after the water distribution channel to thereby reduce the water distribution amount of the anoxic tank of the unit where the aeration tank is located, until the water distribution amount of the anoxic tank of the unit where the aeration tank is located is as low as the minimum value Q5, and the water distribution amount of the minimum value Q5 is maintained unchanged; when the calculated value of the air-water ratio of the aeration tank is greater than C2, the control subsystem is used to adjust the flow control unit after the water distribution channel to thereby increase the water distribution amount of the anoxic tank of the unit where the aeration tank is located, until the water distribution amount of the anoxic tank of the unit where the aeration tank is located is as high as the maximum value Q6, and the water distribution amount of the maximum value Q6 is maintained unchanged;

[0034] (8) In the water distribution of the anoxic tank, the control subsystem also performs feedback control on the water distribution of the anoxic tank according to the sludge concentration signal of the sludge concentration meter. The control can choose to adopt a sludge concentration feedback operation mode or a load balancing feedback operation mode;

[0035] The sludge concentration feedback operation mode includes: using the sludge concentration meter to measure the sludge concentration MLSS of the aeration tank in each unit. i The control subsystem calculates the average MLSS of the sludge concentration in the aeration tank of each unit according to the sludge concentration signal input into the control subsystem by the sludge concentration meter. ave ; The control subsystem sets the minimum value Q5 and the maximum value Q6 of the water supply volume of the anoxic pool in each unit; when MLSS ave (1-n7%)≤MLSS i ≤MLSS ave (1+n7%), the water volume of the anoxic pool in each unit is kept unchanged; n7% is the preset error; when MLSS i ≤MLSS ave (1-n7%), the control subsystem is used to adjust the flow control unit after the water distribution channel according to Formula 2 to reduce the water distribution volume of the anoxic pool in each unit until the water distribution volume of the anoxic pool in each unit is as low as the minimum value Q5, and the water distribution volume of the minimum value Q5 is kept unchanged; when MLSS i ≥MLSS ave(1+n7%), the control subsystem is used to adjust the flow control unit after the water distribution channel according to Formula 2 to increase the water distribution volume of the anoxic pool in each unit until the water distribution volume of the anoxic pool in each unit reaches the maximum value Q6, and the water distribution volume of the maximum value Q6 is kept unchanged; Formula 2 is p*Δ1*Q, where p is the setting coefficient, Q is the actual water flow of the flow control unit after the water distribution channel, Δ1=(|MLSS ave -MLSS i |) / MLSS ave ;

[0036] The load balancing feedback operation mode includes: firstly, the sludge concentration feedback operation mode is performed to adjust the sludge concentration of the aeration tank in each unit to a balanced state; then, the control subsystem calculates the cement ratio Q of the aeration tank in each unit according to the water flow data and sludge concentration signal input into the control subsystem by the flow control unit after the water distribution channel and the sludge concentration meter. i / MLSS i and cement ratio average F ave When F ave (1-n8%)≤Q i / MLSS i ≤F ave (1+n8%), the water volume of the anoxic pool in each unit remains unchanged; n8% is the preset error; when Q i / MLSS i ≤F ave (1-n8%), the control subsystem is used to adjust the flow control unit after the water distribution channel according to Formula 3 to increase the water distribution volume of the anoxic pool in each unit until the water distribution volume of the anoxic pool in each unit reaches the maximum value Q6, and the water distribution volume of the maximum value Q6 is kept unchanged; when Q i / MLSS i ≥F ave (1+n8%), the control subsystem is used to adjust the flow control unit after the water distribution channel according to Formula 3 to reduce the water distribution volume of the anoxic pool in each unit until the water distribution volume of the anoxic pool in each unit is as low as the minimum value Q5, and the water distribution volume of the minimum value Q5 is kept unchanged; Formula 3 is r*Δ2*Q, where r is the setting coefficient, Q is the actual water flow of the flow control unit after the water distribution channel, Δ2=(|Q i / MLSS i -F ave |) / F ave ;

[0037] (9) In the deoxygenation tank, part of the effluent from the deoxygenation tank is returned to the anoxic tank of the same unit, and the rest is sent to the secondary sedimentation tank; in the secondary sedimentation tank, at least part of the liquid at the bottom of the secondary sedimentation tank is sent to the mixing tank of the same series as the reflux liquid.

[0038] According to the present invention, preferably, the preset time is 3-10 hours.

[0039] According to the present invention, preferably, the system comprises a total of 4 sub-series processing modules. In the second proportional control mode of step (3), the water distribution ratio between the primary settling tanks in each sub-series processing module is (w+j*a):(x+k*b):(y+l*c):(z+m*d)=e:f:g:h, wherein:

[0040] e, f, g, h are the water distribution ratios of each primary sedimentation tank respectively;

[0041] w, x, y, z are the water flow data of the flow control unit before each primary sedimentation tank, and the sum of w, x, y, z is the total water volume;

[0042] a, b, c, and d are the shutdown numbers of subsequent biological pool units connected to each primary sedimentation tank;

[0043] j, k, l, and m are coefficients. Preferably, j, k, l, and m are each independently 0.3-0.6.

[0044] According to the present invention, preferably, in the deoxygenation tank, the ratio of the amount of mixed liquid returned to the anoxic tank to the total amount of influent water is (80% to 350%):100%.

[0045] According to the present invention, preferably, in the secondary sedimentation tank, the ratio of the amount of the reflux mixed liquor to the total influent water amount is (50% to 150%):100%.

[0046] According to the present invention, preferably, the hydraulic retention time of the primary sedimentation tank is 0.5 to 2.5 hours.

[0047] According to the present invention, preferably, the hydraulic retention time of the pre-anoxic tank is 0.3 to 0.8 h.

[0048] According to the present invention, preferably, the hydraulic retention time of the anaerobic tank is 0.3 to 2 hours.

[0049] According to the present invention, preferably, the hydraulic retention time of the anoxic tank is 2 to 5 hours.

[0050] According to the present invention, preferably, the hydraulic retention time of the aeration tank is 6 to 10 hours.

[0051] According to the present invention, preferably, the step (9) further comprises: the effluents from the deoxygenation tanks are collected through the effluent channel and then enter the secondary sedimentation tank.

[0052] According to the present invention, preferably, the method further comprises: repeating steps (1)-(9).

[0053] The beneficial effects of the technical solution of the present invention are as follows:

[0054] (1) The present invention has developed a multi-stage linkage water distribution technology to achieve multi-stage linkage of total water inlet-each phase-each series-each biological pool unit, and simultaneously realize multi-mode operation of the sand removal pool, primary sedimentation tank and biological pool, achieving balanced hydraulic load distribution in time and space, providing a relatively stable water inlet environment for the degradation process of microorganisms, which is of great significance to the stable operation of the sewage treatment unit.

[0055] (2) Traditional designs generally use separate water and sludge inlet for each biological pool, and control the F / M of each unit by adjusting the water inlet and sludge inlet respectively, which easily causes an unbalanced F / M load in each unit. Too high or too low F / M will affect the microbial activity and treatment effect, thereby restricting the overall treatment efficiency of the water plant. The present invention proposes an optimized water distribution method for pre-mixing reaction of influent and return sludge, as shown in Figure 2 below. The return liquid of the secondary sedimentation tank and the effluent of the primary sedimentation tank are concentrated and transferred to the front mixing tank, pre-anoxic tank and anaerobic tank for complete mixing reaction, and then the pre-mixed liquid is evenly distributed in each series of biochemical pools, ensuring the balance of system microbial activity from three aspects: sludge concentration, biological pool inlet load, and aerobic pool DO.

[0056] (3) The present invention has a sewage sludge coordinated front-feedback stratified regulation and water distribution control system, which can realize the system sludge concentration feedback and load balancing feedback mode operation, realize the system total water inlet-each period-each series-each biological pool unit multi-level linkage and sewage sludge front-feedback stratified regulation and water distribution coordinated control, realize the balanced distribution of hydraulic load and activated sludge of each unit in time and space, reduce the impact load of the biological pool, enhance the biological reaction efficiency, and ensure that the overall biological denitrification and phosphorus removal system is in an efficient and stable state.

[0057] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0059] Figure 1A schematic diagram of a load-balancing feedback water distribution system for sewage treatment provided according to the present invention is shown (the figure includes: a lifting pump, a water distribution well, two stages of sand removal tanks, the outlet pipe of each stage of sand removal tanks is connected to three series of treatment modules, and the outlet pipe of each series of treatment modules is connected to three biological pool units).

[0060] Figure 2 shows a schematic diagram of the present invention before and after the transformation based on the sewage sludge coordinated load balancing feedback technology. (Figure 2 (a) is the prior art, i.e. before optimization; Figure 2 (b) is the present invention, i.e. after optimization)

[0061] Figure 3 A diagram showing the change in sludge concentration before and after the hydraulic load balancing feedback optimization according to Example 1 of the present invention is shown.

[0062] Figure 4 A diagram showing changes in water inlet load before and after hydraulic load balancing feedback optimization according to Example 1 of the present invention is shown.

[0063] Figure 5 A diagram showing DO changes before and after hydraulic load balancing feedback optimization according to Example 1 of the present invention is shown.

[0064] FIG. 6 shows a control effect diagram according to Example 1 of the present invention ( Figure 6-A .Relative abundance of Anaerobic Fungi; Figure 6-B .Relative abundance of Gammaproteobacteria).

[0065] Description of reference numerals:

[0066] Lifting pump①; water distribution well②; flow control unit before desanding tank③; desanding tank④; primary sedimentation tank⑤; mixing tank⑥; pre-anoxic tank⑦; anaerobic tank⑧; water distribution channel⑨; flow control unit after water distribution channel⑩; anoxic tank ; Aeration tank ; Deoxygenation tank ; Secondary sedimentation tank ; Flow control unit of branch pipe after sand removal tank ; Main flow control unit after sand removal tank ; Main flow control unit after primary sedimentation tank ; 18. Flow control unit of branch pipe after primary sedimentation tank ; Internal reflux flow control unit ; 20. External reflux flow control unit ; 21. Desanding tank blower flow control unit ; 22. Aeration tank blower flow control unit ; 23. Sludge concentration meter ; 24. Control subsystem ; 25. Flow control unit before primary sedimentation tank . DETAILED DESCRIPTION

[0067] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0068] Example 1

[0069] This embodiment provides a load-balanced feedback water distribution system for sewage treatment, the system comprising: a pump ①, a water distribution well ②, a two-stage sand removal tank ④, a series of treatment modules, a unit biological pool, and a series of secondary sedimentation tanks. , and control subsystem ;

[0070] The outlet pipeline of the lifting pump ① is connected to the water distribution well ②, the outlet pipeline of the water distribution well ② is connected to each phase of the desanding pool ④, the outlet pipeline of each phase of the desanding pool ④ is connected to 2 series of processing modules, and the outlet pipeline of each series of processing modules is connected to 6 biological pool units;

[0071] The water inlet pipe of each desanding tank ④ is provided with a desanding tank ④ front flow control unit ③; the air inlet pipe of each desanding tank ④ is provided with a desanding tank blower flow control unit ;

[0072] Each series of treatment modules includes a primary sedimentation tank ⑤, a mixing tank ⑥, a pre-anoxic tank ⑦, an anaerobic tank ⑧ and a water distribution channel ⑨;

[0073] Each primary sedimentation tank⑤ is equipped with a flow control unit before the primary sedimentation tank ; The outlet pipe of each desanding tank ④ is divided into two routes, one of which passes through the desanding tank ④ and then the main flow control unit And flow control unit before primary sedimentation tank Connected to the primary sedimentation tank ⑤, the other way passes through the branch flow control unit after the desanding tank Connected with the mixing tank ⑥, pre-anoxic tank ⑦ and anaerobic tank ⑧ in sequence; the outlet pipe of the primary sedimentation tank ⑤ is divided into two routes, one of which passes through the primary sedimentation tank ⑤ and then connects to the main flow control unit Connected to the anaerobic tank⑧, the other way passes through the primary sedimentation tank⑤ rear branch flow control unit Connected to the water distribution channel ⑨; each biological pool unit includes anoxic pools connected in sequence , aeration tank and deoxygenation tank Each anoxic pool A flow control unit ⑩ after the water distribution channel is arranged before each of the two water distribution channels; the water distribution channel ⑨ is arranged after the anaerobic tank ⑧, and the anaerobic tank ⑧ is connected with the water distribution channel ⑨, the flow control unit ⑩ after the water distribution channel, and the anoxic tank Connect in sequence;

[0074] The deoxygenation tank The outlet pipe is divided into two parts. One part of the outlet pipe is connected to the outlet channel and then further connected to the secondary sedimentation tank. , the other way through the internal reflux flow control unit The hypoxic pool in the same unit Connection: the secondary sedimentation tank The bottom of the unit is controlled by external return flow Connected to the mixing tank ⑥;

[0075] The aeration tank Equipped with aeration tank blower flow control unit and sludge concentration meter ;

[0076] The control subsystem Connected with each control unit and sludge concentration meter respectively.

[0077] This embodiment also provides a sewage treatment load balancing feedback water distribution method, the method adopts the above system and 3 / d recycled water treatment plant, including the following steps:

[0078] (1) The total incoming water is lifted by the pump ① to the water distribution well ② for water distribution in each phase; the control subsystem Perform data analysis and control on the water distribution of the system every 6 hours;

[0079] (2) In the water distribution of the desanding tank ④, the control subsystem The water distribution of the desanding tank ④ is controlled by the flow control unit ③ in front of the desanding tank ④, and the flow control unit of the blower of the desanding tank Supplying air to the desanding pool ④, the control can choose to adopt the first constant water volume operation mode, the first proportional control mode or the air-water ratio control mode;

[0080] The first constant water volume operation mode includes: Set the water supply volume of each phase of desanding pool ④ to 300,000-600,000 m 3 / d, using the control subsystem Sequentially adjust the flow control unit ③ and the pumping pump ① in front of the desanding tank ④, so that the water distribution volume of the desanding tank ④ in each phase is within the range of ±6% of the preset water volume, 6% being the preset error;

[0081] The first proportional control mode includes: Collect the water flow data of the flow control unit ③ in front of each desanding pool ④ and set the water distribution ratio of each desanding pool ④ to 1.1:1. Use the flow control unit ③ in front of each desanding pool ④ to adjust the water volume so that the water distribution ratio between the desanding pools ④ in each period is within the preset ratio ±6%, and 6% is the preset error;

[0082] The gas-water ratio control mode includes: the control subsystem According to the desanding tank blower flow control unit and the flow control unit ③ before the sand removal tank ④ is input to the control subsystem The gas-water ratio of each stage of desanding pool④ is calculated by calculating the gas flow rate data and water flow data (m 3 Air / m 3 water); the control subsystem Set the upper limit A2 (0.05-0.3) and lower limit A1 (0.005-0.1) of the air-water ratio of each stage of the desander pool ④, and the minimum water supply volume Q1 (300,000-450,000 m 3 / d) and the highest value Q2 (40-60m 3 / d); when A1≤the calculated value of the air-water ratio of the desander pool ④≤A2, the water distribution volume of the desander pool ④ in the subsystem of this period is kept unchanged; when the calculated value of the air-water ratio of the desander pool ④ is less than A1, the control subsystem is used Adjust the corresponding flow control unit ③ in front of the desanding tank ④ to reduce the water supply of the desanding tank ④ until the water supply of the desanding tank ④ is as low as the minimum value Q1, and keep the water supply of the minimum value Q1 unchanged; when the calculated value of the air-water ratio of the desanding tank ④ is greater than A2, use the control subsystem Adjust the corresponding flow control unit ③ in front of the desanding tank ④ to increase the water distribution volume of the desanding tank ④ until the water distribution volume of the desanding tank ④ reaches the maximum value Q2, and keep the water distribution volume of the maximum value Q2 unchanged;

[0083] (3) In the water distribution of the primary sedimentation tank ⑤, the control subsystem Through the flow control unit before the primary sedimentation tank Controlling the water distribution of the primary settling tank ⑤, the control may be carried out in the second constant water volume operation mode, the second proportional control mode or the surface load control mode;

[0084] The second constant water volume operation mode includes: The water supply volume of the primary sedimentation tank⑤ in each series treatment module is set to 150,000-300,000 m 3 / d, using the control subsystem Adjust the flow control unit before the primary sedimentation tank , so that the water distribution volume of each primary sedimentation tank ⑤ is within the preset water volume ± 6%, 6% is the preset error; the flow control unit before the primary sedimentation tank After the adjustment is completed, the excess water from the desanding tank ④ passes through the branch flow control unit after the desanding tank Entering the mixing tank⑥;

[0085] The second proportional control mode includes: Collect the flow control unit before each primary sedimentation tank The water flow data and the start and stop data of the subsequent biological pool unit connected to the primary sedimentation tank ⑤ are used to set the water distribution ratio of each primary sedimentation tank ⑤, and the control subsystem is used to control the water flow data and the start and stop data of the subsequent biological pool unit connected to the primary sedimentation tank ⑤. According to the calculation result of formula 1, adjust the flow control unit before the primary sedimentation tank in each series treatment module , so that the water distribution ratio between the primary sedimentation tanks ⑤ in each sub-series treatment module is within the preset ratio ±6%, and 6% is the preset error; the formula 1 is (w+j*a):(x+k*b):(y+l*c):(z+m*d)=e:f:g:h, wherein: e, f, g, h are the set water distribution ratios of each primary sedimentation tank ⑤, in this embodiment, e:f:g:h=2.75:2.75:2.85:2.85; w, x, y, z are the flow control units before each primary sedimentation tank respectively. The water flow data, the sum of w, x, y, z is the total water volume; a, b, c, d are the shutdown numbers of the subsequent biological pool units connected to each primary sedimentation tank ⑤; in this embodiment, a=b=c=d=0; j, k, l, m are coefficients, in this embodiment, j is 0.4, k is 0.4, l is 0.5, and m is 0.5. It can be concluded that w:x:y:z=2.75:2.75:2.85:2.85;

[0086] The surface load control mode includes: the control subsystem According to the flow control unit before the primary sedimentation tank Input to the control subsystem The surface load (m 3 / (m 2 .h)); the control subsystem Set the upper limit B2 (2-4.5) and lower limit B1 (1-2) of the surface load of the primary sedimentation tank ⑤ in each sub-series treatment module, and the minimum water supply volume Q4 (150,000-250,000 m 3 / d) and the highest value Q3 (200,000-300,000 m 3 / d); when B1≤the calculated value of the surface load of the primary sedimentation tank ⑤≤B2, the water supply volume of the primary sedimentation tank ⑤ is kept unchanged; when the calculated value of the surface load of the primary sedimentation tank ⑤ is <B1, the control subsystem is used Adjust the corresponding flow control unit before the primary sedimentation tank Then, the water supply of the primary sedimentation tank ⑤ is increased until the water supply of the primary sedimentation tank ⑤ reaches the maximum value Q3, and the water supply of the maximum value Q3 is kept unchanged; when the calculated value of the surface load of the primary sedimentation tank ⑤ is greater than B2, the control subsystem is used Adjust the corresponding flow control unit before the primary sedimentation tank Then, the water supply volume of the primary sedimentation tank ⑤ is reduced until the water supply volume of the primary sedimentation tank ⑤ is as low as the minimum value Q4, and the water supply volume of the minimum value Q4 is kept unchanged;

[0087] The flow control unit before the primary sedimentation tank After the adjustment is completed, the excess water from the desanding tank ④ passes through the branch flow control unit after the desanding tank Entering the mixing tank⑥;

[0088] (4) In the mixing tank ⑥, the The return liquid at the bottom and the flow control unit from the branch pipe after the desanding tank The effluent from the desanding tank ④ is mixed and sent to the pre-anoxic tank ⑦ and the anaerobic tank ⑧ in sequence;

[0089] (5) The effluent from the primary sedimentation tank ⑤ of step (3) is divided into two paths, one of which passes through the primary sedimentation tank ⑤ and then flows through the main flow control unit Sent to the anaerobic tank⑧, all the way through the primary sedimentation tank⑤ after the branch flow control unit The water is sequentially sent to the water distribution channel ⑨ and the flow control unit ⑩ after the water distribution channel;

[0090] (6) The effluent of the anaerobic tank ⑧ is sent to the water distribution channel ⑨ and the flow control unit ⑩ after the water distribution channel in sequence, and the effluent of the flow control unit ⑩ after the water distribution channel is sent to the anoxic tank ;

[0091] (7) In the anoxic pool In water distribution, the control subsystem The anoxic pool is controlled by a flow control unit ⑩ after the water distribution channel. The water distribution condition is controlled, and the control can choose to adopt the third constant water volume operation mode, the third proportional control mode or the second gas-water ratio control mode;

[0092] The third constant water volume operation mode includes: Set up 6 hypoxic pools The water supply volume is 39,300 m 3 / d, 39,300m 3 / d, 39,500m 3 / d, 39,500m 3 / d, 39,500m 3 / d, 40,000m 3 / d, using the control subsystem Adjust the flow control unit ⑩ after the water distribution channel to make each anoxic pool The water distribution volume is within the preset water volume ±6%, 6% is the preset error;

[0093] The third proportional control mode includes: Collect each anoxic pool The water flow data of the flow control unit ⑩ after the water distribution channel connected to the front is set up in each anoxic pool The water distribution ratio is 1:1:1:1:1.01:1.01. The control subsystem Adjust each hypoxic tank The flow control unit ⑩ connected to the water distribution channel before makes each anoxic pool The water distribution ratio between them is within the preset ratio ±6%, and 6% is the preset error;

[0094] The second gas-water ratio control mode includes: the control subsystem According to the aeration tank blower flow control unit and the flow control unit ⑩ after the distribution channel is input to the control subsystem The gas flow rate data and water flow rate data in each aeration tank are calculated to obtain Calculated value of gas-water ratio (m 3 Air / m 3 water); the control subsystem Set up aeration tanks The upper limit C2 (5-10) and lower limit C1 (1-5) of the gas-water ratio, as well as the anoxic pool The minimum water supply volume is Q5 (25,000-40,000 m 3 / d) and the highest value Q6 (35,000-50,000 m 3 / d); when C1≤ aeration tank When the calculated gas-water ratio is ≤C2, keep the aeration tank Hypoxic pool in the unit The water supply of the aeration tank remains unchanged; When the calculated gas-water ratio is less than C1, the control subsystem Adjust the flow control unit after the water distribution channel to reduce the aeration tank Hypoxic pool in the unit The water supply volume is until the aeration tank Hypoxic pool in the unit The water supply volume of the aeration tank is lowered to the minimum value Q5, and the water supply volume of the minimum value Q5 is kept unchanged; when the aeration tank When the calculated gas-water ratio is greater than C2, the control subsystem Adjust the flow control unit after the water distribution channel to increase the aeration tank Hypoxic pool in the unit The water supply volume is until the aeration tank Hypoxic pool in the unit The water distribution volume is as high as the maximum value Q6, and the water distribution volume of the maximum value Q6 is kept unchanged;

[0095] (8) In the anoxic pool In water distribution, the control subsystem The anoxic tank is also monitored according to the sludge concentration signal of the sludge concentration meter. The water distribution condition is controlled, and the control adopts a sludge concentration feedback operation mode or a load balancing feedback operation mode;

[0096] The sludge concentration feedback operation mode includes: using the sludge concentration meter to measure the aeration tank in each unit Sludge concentration MLSS i ; The control subsystem According to the sludge concentration meter input to the control subsystem The sludge concentration signal in the aeration tank is calculated to obtain the aeration tank in each unit. The average sludge concentration MLSS ave ; The control subsystem Set up hypoxic pools in each unit The minimum water supply value is Q5 and the maximum water supply value is Q6; when MLSS ave (1-3%)≤MLSS i ≤MLSS ave (1+3%), maintain the hypoxic pool in each unit The water supply volume remains unchanged; 3% is the preset error; when MLSS i ≤MLSS ave (1-3%), using the control subsystem According to formula 2, the flow control unit ⑩ of the water distribution channel is adjusted to reduce the anoxic pool in each unit The water supply volume is up to the anoxic pool in each unit. The water supply volume is lowered to the minimum value Q5, and the water supply volume of the minimum value Q5 is kept unchanged; when MLSS i ≥MLSS ave(1+3%), using the control subsystem According to formula 2, the flow control unit ⑩ of the water distribution channel is adjusted to increase the anoxic pool in each unit The water supply volume is up to the anoxic pool in each unit. The water distribution volume is raised to the maximum value Q6, and the water distribution volume of the maximum value Q6 is kept unchanged; the formula 2 is p*Δ1*Q, where p is the setting coefficient, Q is the actual water flow of the flow control unit ⑩ after the water distribution channel, Δ1=(|MLSS ave -MLSS i |) / MLSS ave ;

[0097] The load balancing feedback operation mode includes: firstly performing the sludge concentration feedback operation mode to adjust the aeration tank in each unit The sludge concentration reaches a balanced state; then, the control subsystem According to the flow control unit ⑩ and the sludge concentration meter after the water distribution channel, the control subsystem The water flow data and sludge concentration signal in the aeration tank are calculated to obtain the aeration tank in each unit. Cement ratio Q i / MLSS i and cement ratio average F ave When F ave (1-3%)≤Q i / MLSS i ≤F ave (1+3%), maintain the hypoxic pool in each unit The water distribution volume remains unchanged; 3% is the preset error; when Q i / MLSS i ≤F ave (1-3%), using the control subsystem According to formula 3, the flow control unit ⑩ of the water distribution channel is adjusted to increase the anoxic pool in each unit The water supply volume is up to the anoxic pool in each unit. The water supply volume is as high as the maximum value Q6, and the water supply volume of the maximum value Q6 is kept unchanged; when Q i / MLSS i ≥F ave (1+3%), using the control subsystem According to formula 3, the flow control unit ⑩ of the water distribution channel is adjusted to reduce the anoxic pool in each unit The water supply volume is up to the anoxic pool in each unit. The water distribution volume is reduced to the minimum value Q5, and the water distribution volume of the minimum value Q5 is kept unchanged; the formula 3 is r*Δ2*Q, where r is the setting coefficient, Q is the actual water flow of the flow control unit ⑩ after the water distribution channel, Δ2=(|Q i / MLSS i -F ave |) / F ave ;

[0098] (9) In the deoxygenation tank In the deoxygenation tank A portion of the effluent is returned to the anoxic pool in the same unit. , and the rest is sent to the secondary sedimentation tank In the secondary sedimentation tank In the secondary sedimentation tank At least part of the liquid at the bottom is sent as reflux liquid to the mixing tank of the same series⑥;

[0099] Wherein, in the deoxygenation tank , and return to the anoxic pool The ratio of the mixed liquid volume to the total water volume is (80% to 350%): 100%;

[0100] In the secondary sedimentation tank In the process, the ratio of the reflux mixed liquid volume to the total influent water volume is (50% to 150%): 100%;

[0101] The hydraulic retention time of the primary sedimentation tank ⑤ is 0.5 to 2.5 hours;

[0102] The hydraulic retention time of the pre-anoxic tank ⑦ is 0.3 to 0.8 h;

[0103] The hydraulic retention time of the anaerobic tank⑧ is 0.3 to 2h;

[0104] The anoxic pool The hydraulic retention time is 2 to 5 hours;

[0105] The aeration tank The hydraulic retention time is 6 to 10 hours.

[0106] The method further comprises: repeating steps (1)-(9).

[0107] The above-mentioned embodiment 1 adopts the sewage treatment load balancing feedback water distribution system and method of the present invention, wherein:

[0108] The changes of sludge concentration before and after optimization of hydraulic load balance feedback are as follows Figure 3As shown, the relative deviation of the sludge concentration of each group of biological pools before equalization was ±18.4%, and the relative deviation of the sludge concentration of each group of biological pools after equalization (i.e., after using the system and method of the present invention, the same below) was ±3.0%, and the concentration fluctuation of the influent sludge of each group of biological pools was greatly reduced, and the sludge load was relatively stable;

[0109] Changes in influent pollutant concentration before and after optimization of hydraulic load balancing feedback Figure 4 As shown, the relative deviation of COD in each group of biological pools before equalization was ±36.9%, and the relative deviation of COD in each group of biological pools after equalization was ±2.7%. The relative deviation of total nitrogen (TN) in each group of biological pools before equalization was ±25.7%, and the relative deviation of TN in each group of biological pools after equalization was ±5.1%. The fluctuation of pollutant concentration in each group of biological pools was greatly reduced, and the influent load was relatively stable.

[0110] The changes of dissolved oxygen concentration (DO) at the end of the biological pond before and after the optimization of hydraulic load balance feedback are as follows Figure 5 As shown, the relative deviation of DO in each group of biological pools before equalization was ±60.2%, and the relative deviation of DO in each group of biological pools after equalization was ±11.9%. The fluctuation of DO concentration in each group of biological pools was reduced, and the terminal DO was relatively stable.

[0111] After the balance technology of the present invention is used for regulation, the results of the bacterial flora analysis are shown in FIG6 : after balance, the relative abundance of anaerobic fungi (Anaerolineae) in the aerobic pool is as high as 15.24% ( Figure 6-A ), which is much higher than the abundance of comparison sample 1 and comparison sample 2 without the use of equilibrium technology. Its growth characteristics are strict anaerobic conditions; γ-Proteobacteria have the highest relative proportion in the sequence, with a relative abundance of up to 20.83% ( Figure 6-B ), has a good denitrification effect.

[0112] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A sewage treatment load balancing feedback water distribution method, characterized in that: The system used in the method includes: at least one lifting pump, at least one water distribution well, a phased sand removal tank, a series of treatment modules, a unit biological tank, a series of secondary sedimentation tanks, and a control subsystem; The outlet pipeline of the lifting pump is connected to the water distribution well, the outlet pipeline of the water distribution well is connected to each phase of the desanding tank, the outlet pipeline of each phase of the desanding tank is connected to at least one series processing module, and the outlet pipeline of each series processing module is connected to at least one biological pool unit; A flow control unit before the desander is provided on the water inlet pipe of each desander; a flow control unit for the desander blower is provided on the air inlet pipe of each desander; Each series of treatment modules includes a primary sedimentation tank, a mixing tank, a pre-anoxic tank, an anaerobic tank and a water distribution channel; A flow control unit before the primary sedimentation tank is provided in front of each primary sedimentation tank; the outlet pipeline of each desander tank is divided into two routes, one of which is connected to the primary sedimentation tank through the main flow control unit after the desander tank and the flow control unit before the primary sedimentation tank in sequence, and the other is connected to the mixing tank, pre-anoxic tank and anaerobic tank in sequence through the branch flow control unit after the desander tank; the outlet pipeline of the primary sedimentation tank is divided into two routes, one of which is connected to the anaerobic tank through the main flow control unit after the primary sedimentation tank, and the other is connected to the water distribution channel through the branch flow control unit after the primary sedimentation tank; each biological pool unit includes an anoxic tank, an aeration tank and a deoxygenation tank connected in sequence; a flow control unit after the water distribution channel is provided in front of each anoxic tank; the water distribution channel is provided after the anaerobic tank, and the anaerobic tank is connected to the water distribution channel, the flow control unit after the water distribution channel and the anoxic tank in sequence; The outlet pipe of the deoxygenation tank is divided into two routes, one of which is connected to the secondary sedimentation tank, and the other is connected to the anoxic tank of the same unit through an internal reflux flow control unit; the bottom of the secondary sedimentation tank is connected to the mixing tank through an external reflux flow control unit; The aeration tank is provided with an aeration tank blower flow control unit and a sludge concentration meter; The control subsystem is connected to each control unit and the sludge concentration meter respectively; The method comprises the following steps: (1) The total incoming water is lifted to the water distribution well by the pumping pump for water distribution in each period; the control subsystem performs data analysis and control on the water distribution status of the system at preset time intervals; (2) In the water distribution of the desander, the control subsystem controls the water distribution of the desander through the flow control unit before the desander, and supplies air to the desander through the flow control unit of the desander blower. The control can choose to adopt the first constant water volume operation mode, the first proportional control mode or the air-water ratio control mode; The first constant water volume operation mode includes: setting the water volume of each desanding tank through the control subsystem, and adjusting the flow control unit and the pumping pump in front of the desanding tank in sequence by the control subsystem, so that the water volume of each desanding tank is within the range of ±n1% of the preset water volume, where n1% is a preset error; The first proportional control mode includes: collecting water flow data of the flow control unit in front of each desanding pool through the control subsystem and setting the water distribution ratio of each desanding pool, and adjusting the water volume by using the flow control unit in front of each desanding pool so that the water distribution ratio between the desanding pools in each period is within the range of ±n2% of the preset ratio, where n2% is a preset error; The gas-water ratio control mode includes: the control subsystem calculates the gas-water ratio of each desander according to the gas flow data and water flow data input into the control subsystem by the desander blower flow control unit and the desander front flow control unit; the control subsystem sets the upper limit A2 and lower limit A1 of the gas-water ratio of each desander, as well as the minimum value Q1 and maximum value Q2 of the water distribution of each desander; when A1≤the calculated gas-water ratio of the desander≤A2, the water distribution of the desander in the subsystem of this period is kept unchanged; when the desander is When the calculated value of the gas-water ratio of the desander pool is less than A1, the control subsystem is used to adjust the corresponding flow control unit in front of the desander pool to thereby reduce the water distribution volume of the desander pool until the water distribution volume of the desander pool is as low as the minimum value Q1, and the water distribution volume of the minimum value Q1 is kept unchanged; when the calculated value of the gas-water ratio of the desander pool is greater than A2, the control subsystem is used to adjust the corresponding flow control unit in front of the desander pool to thereby increase the water distribution volume of the desander pool until the water distribution volume of the desander pool is as high as the maximum value Q2, and the water distribution volume of the maximum value Q2 is kept unchanged; (3) In the water distribution of the primary sedimentation tank, the control subsystem controls the water distribution of the primary sedimentation tank through the flow control unit before the primary sedimentation tank, and the control can choose to adopt the second constant water volume operation mode, the second proportional control mode or the surface load control mode; The second constant water volume operation mode includes: setting the water distribution volume of the primary settling tank in each series processing module by the control subsystem, and adjusting the flow control unit before the primary settling tank by the control subsystem so that the water distribution volume of each primary settling tank is within the range of ±n3% of the preset water volume, where n3% is a preset error; after the flow control unit before the primary settling tank is adjusted, the excess water from the desanding tank enters the mixing tank through the branch pipe flow control unit after the desanding tank; The second proportional control mode includes: collecting water flow data of the flow control unit before each primary sedimentation tank and the start and stop data of the subsequent biological pool unit connected to the primary sedimentation tank through the control subsystem, and setting the water distribution ratio of each primary sedimentation tank, and using the control subsystem to adjust the flow control unit before the primary sedimentation tank in each sub-series processing module according to the calculation result of formula 1, so that the water distribution ratio between the primary sedimentation tanks in each sub-series processing module is within the preset ratio ±n4%, and n4% is a preset error; Formula 1 is (M w +M j *M a )=M e , where: M e is the water distribution ratio of a certain primary sedimentation tank; M w M is the water flow data of the corresponding flow control unit before the primary sedimentation tank; a M is the number of subsequent biological pool units that are shut down and connected to the primary sedimentation tank; j is a coefficient, and the coefficient is 0.3-0.6; The surface load control mode includes: the control subsystem calculates the surface load of the primary sedimentation tank in each sub-series processing module according to the water flow data input into the control subsystem by the flow control unit before the primary sedimentation tank; the control subsystem sets the upper limit B2 and lower limit B1 of the surface load of the primary sedimentation tank in each sub-series processing module, as well as the minimum value Q4 and maximum value Q3 of the water distribution volume of the primary sedimentation tank in each sub-series processing module; when B1≤the calculated value of the surface load of the primary sedimentation tank≤B2, the water distribution volume of the primary sedimentation tank is kept unchanged; when the primary sedimentation tank When the calculated value of the surface load of the primary sedimentation tank is less than B1, the control subsystem is used to adjust the corresponding flow control unit before the primary sedimentation tank to increase the water distribution volume of the primary sedimentation tank until the water distribution volume of the primary sedimentation tank reaches the maximum value Q3, and the water distribution volume of the maximum value Q3 is kept unchanged; when the calculated value of the surface load of the primary sedimentation tank is greater than B2, the control subsystem is used to adjust the corresponding flow control unit before the primary sedimentation tank to reduce the water distribution volume of the primary sedimentation tank until the water distribution volume of the primary sedimentation tank reaches the minimum value Q4, and the water distribution volume of the minimum value Q4 is kept unchanged; After the flow control unit before the primary sedimentation tank is adjusted, the excess water from the desanding tank enters the mixing tank through the branch pipe flow control unit after the desanding tank; (4) In the mixing tank, the return liquid from the bottom of the secondary sedimentation tank and the desander effluent from the branch flow control unit after the desander are mixed and sent to the pre-anoxic tank and the anaerobic tank in sequence; (5) The effluent from the primary sedimentation tank in step (3) is divided into two routes, one of which is sent to the anaerobic tank through the main flow control unit after the primary sedimentation tank, and the other is sent to the water distribution channel and the flow control unit after the water distribution channel in sequence through the branch flow control unit after the primary sedimentation tank; (6) sending the effluent of the anaerobic tank to the water distribution channel and the flow control unit after the water distribution channel in sequence, and sending the effluent of the flow control unit after the water distribution channel to the anoxic tank; (7) In the water distribution of the anoxic pool, the control subsystem controls the water distribution of the anoxic pool through the flow control unit after the water distribution channel, and the control can choose to adopt the third constant water volume operation mode, the third proportional control mode or the second air-water ratio control mode; The third constant water volume operation mode includes: setting the water volume of each anoxic pool by the control subsystem, and adjusting the flow control unit after the water distribution channel by the control subsystem so that the water volume of each anoxic pool is within the range of ±n5% of the preset water volume, where n5% is a preset error; The third proportional control mode includes: collecting water flow data of the flow control unit after the water distribution channel connected in front of each anoxic pool by the control subsystem and setting the water distribution ratio of each anoxic pool, and adjusting the flow control unit after the water distribution channel connected in front of each anoxic pool by the control subsystem so that the water distribution ratio between the anoxic pools is within the range of ±n6% of the preset ratio, where n6% is the preset error; The second air-water ratio control mode includes: the control subsystem calculates the air-water ratio of each aeration tank according to the air delivery data and water flow data input into the control subsystem by the aeration tank blower flow control unit and the water distribution channel rear flow control unit; the control subsystem sets the upper limit C2 and lower limit C1 of the air-water ratio of each aeration tank, and the minimum value Q5 and maximum value Q6 of the water distribution volume of each anoxic tank; when C1≤the air-water ratio calculated value of the aeration tank≤C2, the water distribution volume of the anoxic tank of the unit where the aeration tank is located is kept unchanged; when the air-water ratio calculated value of the aeration tank is less than C1 ... anoxic tank is located is kept unchanged; when the air-water ratio calculated value of the aeration tank is less than C1, the water distribution volume of the anoxic tank of the unit where the anoxic tank is located is kept unchanged; when the air-water ratio calculated value of The control subsystem is used to adjust the flow control unit after the water distribution channel to thereby reduce the water distribution amount of the anoxic tank of the unit where the aeration tank is located, until the water distribution amount of the anoxic tank of the unit where the aeration tank is located is as low as the minimum value Q5, and the water distribution amount of the minimum value Q5 is maintained unchanged; when the calculated value of the air-water ratio of the aeration tank is greater than C2, the control subsystem is used to adjust the flow control unit after the water distribution channel to thereby increase the water distribution amount of the anoxic tank of the unit where the aeration tank is located, until the water distribution amount of the anoxic tank of the unit where the aeration tank is located is as high as the maximum value Q6, and the water distribution amount of the maximum value Q6 is maintained unchanged; (8) In the water distribution of the anoxic tank, the control subsystem also performs feedback control on the water distribution of the anoxic tank according to the sludge concentration signal of the sludge concentration meter. The control can choose to adopt a sludge concentration feedback operation mode or a load balancing feedback operation mode; The sludge concentration feedback operation mode includes: using the sludge concentration meter to measure the sludge concentration MLSS of the aeration tank in each unit. i The control subsystem calculates the average MLSS of the sludge concentration in the aeration tank of each unit according to the sludge concentration signal input into the control subsystem by the sludge concentration meter. ave ; The control subsystem sets the minimum value Q5 and the maximum value Q6 of the water supply volume of the anoxic pool in each unit; when MLSS ave (1-n7%)≤MLSS i ≤MLSS ave (1+n7%), the water volume of the anoxic pool in each unit is kept unchanged; n7% is the preset error; when MLSS i ≤MLSS ave (1-n7%), the control subsystem is used to adjust the flow control unit after the water distribution channel according to Formula 2 to reduce the water distribution volume of the anoxic pool in each unit until the water distribution volume of the anoxic pool in each unit is as low as the minimum value Q5, and the water distribution volume of the minimum value Q5 is kept unchanged; when MLSS i ≥MLSS ave (1+n7%), the control subsystem is used to adjust the flow control unit after the water distribution channel according to Formula 2 to increase the water distribution volume of the anoxic pool in each unit until the water distribution volume of the anoxic pool in each unit reaches the maximum value Q6, and the water distribution volume of the maximum value Q6 is kept unchanged; Formula 2 is p*Δ1*Q, where p is the setting coefficient, Q is the actual water flow of the flow control unit after the water distribution channel, Δ1=(|MLSS ave -MLSS i |) / MLSS ave ; The load balancing feedback operation mode includes: firstly, the sludge concentration feedback operation mode is performed to adjust the sludge concentration of the aeration tank in each unit to a balanced state; then, the control subsystem calculates the cement ratio Q of the aeration tank in each unit according to the water flow data and sludge concentration signal input into the control subsystem by the flow control unit after the water distribution channel and the sludge concentration meter. i / MLSS i and cement ratio average F ave When F ave (1-n8%)≤Q i / MLSS i ≤F ave (1+n8%), the water volume of the anoxic pool in each unit is kept unchanged; n8% is the preset error; when Q i / MLSS i ≤F ave (1-n8%), the control subsystem is used to adjust the flow control unit after the water distribution channel according to Formula 3 to increase the water distribution volume of the anoxic pool in each unit until the water distribution volume of the anoxic pool in each unit reaches the maximum value Q6, and the water distribution volume of the maximum value Q6 is kept unchanged; when Q i / MLSS i ≥F ave (1+n8%), the control subsystem is used to adjust the flow control unit after the water distribution channel according to Formula 3 to reduce the water distribution volume of the anoxic pool in each unit until the water distribution volume of the anoxic pool in each unit is as low as the minimum value Q5, and the water distribution volume of the minimum value Q5 is kept unchanged; Formula 3 is r*Δ2*Q, where r is the setting coefficient, Q is the actual water flow of the flow control unit after the water distribution channel, Δ2=(|Q i / MLSS i -F ave |) / F ave ; (9) In the deoxygenation tank, part of the effluent from the deoxygenation tank is returned to the anoxic tank of the same unit, and the rest is sent to the secondary sedimentation tank; in the secondary sedimentation tank, at least part of the liquid at the bottom of the secondary sedimentation tank is sent to the mixing tank of the same series as the reflux liquid.

2. The sewage treatment load balancing feedback water distribution method according to claim 1, wherein: The mixing tank and the pre-anoxic tank are combined into one tank or are separately provided; The system also includes multiple series of outlet channels, and the outlet pipes of each deoxygenation tank are collected in the outlet channel and further connected to the secondary sedimentation tank.

3. The sewage treatment load balancing feedback water distribution method according to claim 1, wherein: The phased sand removal pool has 2-n phases; the outlet pipe of each phase of the sand removal pool is connected to 2-n sub-series processing modules, and the outlet pipe of each sub-series processing module is connected to 2-n biological pool units.

4. The sewage treatment load balancing feedback water distribution method according to claim 1, wherein: The preset time is 3-10 hours.

5. The sewage treatment load balancing feedback water distribution method according to claim 1, wherein: The system includes a total of 4 series processing modules. In the second proportional control mode of step (3), the water distribution ratio between the primary sedimentation tanks in each series processing module is (w+j*a):(x+k*b):(y+l*c):(z+m*d)=e:f:g:h, where: e, f, g, h are the water distribution ratios of each primary sedimentation tank respectively; w, x, y, z are the water flow data of the flow control unit before each primary sedimentation tank, and the sum of w, x, y, z is the total water volume; a, b, c, and d are the shutdown numbers of subsequent biological pool units connected to each primary sedimentation tank; j, k, l, and m are coefficients, and j, k, l, and m are independently 0.3-0.

6.

6. The sewage treatment load balancing feedback water distribution method according to claim 1, wherein: In the deoxygenation tank, the ratio of the mixed liquid volume returned to the anoxic tank to the total influent water volume is (80% to 350%): 100%; In the secondary sedimentation tank, the ratio of the amount of the reflux mixed liquor to the total amount of influent water is (50% to 150%):100%.

7. The sewage treatment load balancing feedback water distribution method according to claim 1, wherein: The hydraulic retention time of the primary sedimentation tank is 0.5 to 2.5 hours; The hydraulic retention time of the pre-anoxic tank is 0.3 to 0.8 hours; The hydraulic retention time of the anaerobic tank is 0.3 to 2 hours; The hydraulic retention time of the anoxic tank is 2 to 5 hours; The hydraulic retention time of the aeration tank is 6 to 10 hours.

8. The sewage treatment load balancing feedback water distribution method according to claim 1, wherein: The step (9) also includes: the effluent from each deoxygenation tank is collected through an effluent channel and then enters a secondary sedimentation tank.

9. The sewage treatment load balancing feedback water distribution method according to claim 1, wherein: The method further comprises: repeating steps (1)-(9).

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