A variable-load influent sewage treatment system and method

Abstract

The present invention discloses a variable-load influent sewage treatment system and method, belonging to the technical field of sewage treatment. The system includes an influent pipeline provided with a concentration monitor and a flowmeter; a water distribution device, which has a mixing zone and multiple outlet zones inside. The mixing zone is located upstream of the outlet zones in the sewage treatment path and is connected to the influent pipeline; a biochemical reaction device, which has multiple anoxic tanks and aerobic tanks, and aeration blowers are provided in all the aerobic tanks; wherein, the outlet zone at the upstream end of the sewage treatment path in the water distribution device is connected to the anoxic tank at the downstream end of the sewage treatment path in the biochemical reaction device, and the remaining outlet zones are sequentially and correspondingly connected to the remaining anoxic tanks, and the outlet zones and the anoxic tanks are connected through a water distribution pipeline, and a solenoid valve is provided on the water distribution pipeline. The method is realized through this system. The system can adjust the treatment volume of the biochemical reaction device according to the influent water quality and quantity of the sewage, so as to achieve stable and qualified effluent water quality.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly relates to a sewage treatment system and method with variable load influent water. Background Art

[0002] For service areas, scenic spots, and public places, due to random changes in traffic flow and pedestrian flow caused by weather, holidays, time periods, or other factors, the quantity and quality of the generated sewage have large fluctuations. (1) Generally, the sewage volume is larger in summer and the concentration is lower, while the water volume is smaller in winter and the concentration is higher (in some scenic spots, the water volume in winter is larger than that in summer); (2) There are also large fluctuations in the sewage volume within a day. Generally, the peak of the sewage volume occurs at noon, and the trough occurs late at night or in the early morning; (3) During holidays, especially during the long legal holidays, the pedestrian flow is generally 2 times or more of the daily average value, and the generated sewage volume generally increases by a corresponding multiple accordingly.

[0003] For the daily variation of the domestic sewage volume in rural areas, it is affected by the rest time and migration of the village population. The sewage volume is large during the three peak periods of morning / noon / evening, and small during other periods; the water volume is small on weekdays and large on holidays. Especially in villages that collect sewage using natural channels (ditches), it is significantly affected by climate and seasons. The water volume is small and the pollution concentration is high in winter; the water volume is large and the pollution concentration is low in summer. In addition, tourist areas and farmhouses have a greater impact on the variation of sewage volume, with a larger water volume in the peak season and a smaller water volume in the off-season.

[0004] The biochemical treatment section of the sewage treatment station can generally withstand short-term shock loads, but for the influent water with high concentration and large water volume for a long time, it is difficult for the biochemical system to achieve stable and qualified effluent water quality. And being in a low-load operation state for a long time will inevitably cause sludge aging and sludge bulking, affecting the system operation.

[0005] Therefore, a sewage treatment system for abnormal fluctuations in influent water quality and quantity is needed. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides a sewage treatment system and method with variable load influent water. This treatment system can adjust the treatment volume of the biochemical reaction equipment according to the influent water quality and quantity of the sewage, and then achieve stable and qualified effluent water quality, and can be widely applied to the fields of rural, municipal, and mixed sewage treatment with large fluctuations in water quality and quantity.

[0007] The technical solution adopted by the present invention is:

[0008] A sewage treatment system with variable load influent water, comprising:

[0009] An influent pipeline, on which a concentration monitor and a flowmeter are arranged;

[0010] A water distribution device, inside which there are multiple partitions arranged in sequence and rising along the sewage treatment path, dividing the water distribution device into a mixing zone and multiple water outlet zones; the mixing zone is located upstream of the water outlet zones on the sewage treatment path and is connected to the inlet pipeline;

[0011] A biochemical reaction device, located downstream of the water distribution device on the sewage treatment path, having multiple anoxic tanks and aerobic tanks, and the anoxic tanks and aerobic tanks are arranged at intervals in sequence on the sewage treatment path; aeration blowers are provided in all the aerobic tanks;

[0012] Among them, the water outlet zone at the upstream first end of the sewage treatment path in the water distribution device is connected to the anoxic tank at the downstream last end of the sewage treatment path in the biochemical reaction device, and the remaining water outlet zones are sequentially and correspondingly connected to the remaining anoxic tanks; and the water outlet zone is connected to the anoxic tank through a water distribution pipeline, and a solenoid valve is provided on the water distribution pipeline.

[0013] In the variable load influent sewage treatment system disclosed in the present application, the system further includes a PLC controller, and the PLC controller is respectively connected to the concentration monitor, flowmeter, aeration blower, and solenoid valve; the PLC controller can control the opening or closing of the aeration blower and solenoid valve according to the monitoring data of the concentration monitor and flowmeter.

[0014] In the variable load influent sewage treatment system disclosed in the present application, the concentration monitor is an ammonia nitrogen monitor, a COD monitor or a TN monitor.

[0015] In the variable load influent sewage treatment system disclosed in the present application, when the biochemical reaction device is set as an anoxic tank at the end of the sewage treatment path, a membrane tank is arranged downstream of the biochemical reaction device, and an aeration blower is provided in the membrane tank.

[0016] In the variable load influent sewage treatment system disclosed in the present application, the membrane tank is provided with a nitrification liquid reflux pipeline, and the nitrification liquid reflux pipeline is connected to the mixing zone.

[0017] In the variable load influent sewage treatment system disclosed in the present application, when the biochemical reaction device is set as an aerobic tank at the end of the sewage treatment path, a secondary sedimentation tank is arranged downstream of the biochemical reaction device.

[0018] In the variable load influent sewage treatment system disclosed in the present application, the secondary sedimentation tank is provided with a sludge reflux pipeline, and the aerobic tank at the end of the sewage treatment path in the biochemical reaction device is provided with a nitrification liquid reflux pipeline, and both the sludge reflux pipeline and the nitrification liquid reflux pipeline are connected to the mixing zone.

[0019] In the variable load influent sewage treatment system disclosed in the present application, fillers are provided in both the anoxic tank and the aerobic tank.

[0020] Based on the same inventive concept, the present application also provides a method for treating sewage by using the above-mentioned sewage treatment system, specifically, a method for treating sewage with variable load inflow, comprising the following steps:

[0021] Step S1. Start the sewage treatment system, the sewage enters the mixing zone of the water distribution device through the water inlet pipe, and monitors the concentration and flow of the sewage;

[0022] Step S2. Open the first solenoid valve on the first water distribution pipe, and the sewage is mixed with the returned sludge and nitrification liquid in the mixing area. As the water level rises, the sewage climbs over the first baffle and enters the first water outlet area, and then enters the first anoxic tank from the first water outlet area, where it undergoes a denitrification reaction with the nitrification liquid to remove nitrogen, and then is treated in the first aerobic tank and the second sedimentation tank before being discharged in compliance with the standards; or treated in the membrane tank before being discharged in compliance with the standards;

[0023] Step S3. When the concentration or flow rate of sewage increases, and the volume load required for sewage treatment reaches a certain set value, the first solenoid valve is closed, and the second solenoid valve on the second water distribution pipe is opened, and the sewage goes over the second baffle into the second water outlet area, and then enters the second anoxic tank from the second water outlet area, and then is treated in the second aerobic tank, the first anoxic tank, the first aerobic tank, and the second sedimentation tank in sequence, and then meets the discharge standard, or is treated in the second aerobic tank, the first anoxic tank, and the membrane tank, and then meets the discharge standard, so as to achieve volume increase and increase the impact load of the system;

[0024] Step S4. Similar to step S3, when the concentration or flow rate of sewage continues to increase, after the volume load required for sewage treatment reaches a certain set value, the second solenoid valve is closed, and the solenoid valve on the subsequent water distribution pipeline is opened to increase the number of anoxic tanks and aerobic tanks in operation to increase the volume and increase the impact load of the system;

[0025] Step S5. When the volume load required for the later sewage treatment is reduced to the set value, the reverse adjustment will be made, the front-end anoxic tank and aerobic tank will enter the idle period, and the number of anoxic tanks and aerobic tanks in operation will be reduced to achieve volume reduction and adjust the impact load.

[0026] In the variable load influent sewage treatment method disclosed in the present application, in step S1, before the sewage treatment system is operated, only the first anoxic tank and the first aerobic tank are operated with sludge, and after the load is increased, the sludge is gradually distributed to the remaining anoxic tanks and aerobic tanks.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention provides a sewage treatment system and method with variable load influent, which can adjust the operation quantity of the anoxic tank and the aerobic tank according to the influent water quality and quantity of sewage, and then adjust the treatment volume of the biochemical reaction equipment, and perform mixing and rectification through partition plates to ensure that the system reaches a stable and qualified effluent water quality, and can be widely applied to the fields of rural villages, municipal administration, and mixed sewage treatment with large fluctuations in water quality and quantity. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 Structural schematic of the sewage treatment system with variable load influent Figure 1 ;

[0031] Figure 2 Structural schematic of the sewage treatment system with variable load influent Figure 2 ;

[0032] Figure 3 Structural schematic of the sewage treatment system with variable load influent Figure 3 ;

[0033] Figure 4 Structural schematic diagram of the PLC controller.

[0034] REFERENCE NUMERALS:

[0035] 100, influent pipeline; 101, concentration monitor; 102, flowmeter;

[0036] 200, water distribution device; 201, first partition plate; 202, second partition plate; 203, third partition plate; 204, mixing zone; 205, first effluent zone; 206, second effluent zone; 207, third effluent zone; 208, first water distribution pipeline; 209, second water distribution pipeline; 210, third water distribution pipeline; 211, first solenoid valve; 212, second solenoid valve; 213, third solenoid valve;

[0037] 300, biochemical reaction equipment; 301, first aerobic tank; 302, first anoxic tank; 303, second aerobic tank; 304, second anoxic tank; 305, third aerobic tank; 306, third anoxic tank; 307, packing; 308, aeration blower;

[0038] 400, membrane tank; 401, nitrification liquid reflux pipeline;

[0039] 500, secondary sedimentation tank; 501, sludge reflux pipeline. Detailed Embodiments

[0040] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings. It can be understood that the specific embodiments described herein are only for explaining the present application and not for limiting the present application. Additionally, it should be noted that for the convenience of description, only the parts related to the present application rather than all the structures are shown in the drawings. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0041] The terms "comprising" and "having" in the present application and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products, or devices.

[0042] Furthermore, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention pertains. The terms used in the description of the present invention are only for describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0044] Referring to the following, the embodiments of the present application provide a variable-load influent sewage treatment system, and the main purpose is to solve the problem that it is difficult for the biochemical treatment section of the sewage treatment station to achieve stable and qualified effluent water quality for the influent water with high concentration and large water volume for a long time.

[0045] Please refer to Figures 1 to 4 As shown, the embodiments of the present application provide a variable-load influent sewage treatment system, and the main purpose is to solve the problem that it is difficult for the biochemical treatment section of the sewage treatment station to achieve stable and qualified effluent water quality for the influent water with high concentration and large water volume for a long time.

[0046] The present application discloses a variable load inlet sewage treatment system, comprising:

[0047] The water inlet pipe 100 is provided with a concentration monitor 101 and a flow meter 102. The concentration monitor 101 is used to monitor the water quality of the sewage water, and the flow meter 102 is used to monitor the flow rate of the sewage water.

[0048] The water distribution device 200 has a plurality of partitions that are successively raised along the sewage treatment path, which divide the water distribution device 200 into a mixing zone 204 and a plurality of water outlet zones. The mixing zone 204 is located upstream of the water outlet zone on the sewage treatment path and is connected to the water inlet pipe 100. The sewage water in the water inlet pipe 100 enters the mixing zone 204, and after being mixed with the nitrification liquid in the mixing zone 204, it climbs over the partition and enters the water outlet zone.

[0049] The biochemical reaction equipment 300 is located downstream of the water distribution device 200 on the sewage treatment path, and has multiple anoxic tanks and aerobic tanks, which are arranged in sequence on the sewage treatment path. The aerobic tanks are each individually provided with an aeration fan 308, so that each aerobic tank can operate independently. The sewage mixed by the water distribution device 200 enters the biochemical reaction equipment 300 for biochemical treatment.

[0050] The outlet water area at the upstream end of the sewage treatment path in the water distribution device 200 is connected to the anoxic pool at the downstream end of the sewage treatment path in the biochemical reaction equipment 300, and the remaining outlet water areas are connected to the remaining anoxic pools in sequence. The number of outlet water areas is the same as the number of anoxic pools, and the outlet water areas are connected to the anoxic pools through a water distribution pipe, and a solenoid valve is provided on the water distribution pipe.

[0051] A plurality of partitions which rise successively are arranged in the water distribution device 200. The partitions enable the system to have mixing and rectifying functions. The height of the partitions is movable and adjustable. In actual application, the amount of water can be adjusted by the height. By setting the partitions, the water distribution pipes at the end of the process do not need to be equipped with solenoid valves, thereby reducing the number of valves.

[0052] Sewage enters the water through the water inlet pipe 100, the concentration monitor 101 monitors the concentration of the sewage, the flow meter 102 monitors the flow of the sewage, and the sewage enters the water distribution device 200. After mixing in the mixing area 204, the sewage climbs over the partition and enters the water outlet area, and then enters the biochemical treatment equipment through the water distribution pipe for biochemical treatment. When the water quality deteriorates or the water volume increases, the sewage climbs over the partition in turn and enters different water outlet areas, increasing the number of anoxic tanks and aerobic tanks in operation, that is, every time the sewage climbs over a partition, an anoxic tank and an aerobic tank are added to the biochemical reaction equipment 300 for sewage treatment, thereby realizing sewage treatment load regulation and achieving stable and qualified effluent water quality.

[0053] The tank volume of the biochemical treatment in this system is calculated and determined according to the minimum influent water condition in an actual time period. It should be understood that the number of anoxic tanks and aerobic tanks in the biochemical reaction device 300 and the number of water distribution groups in the water distribution device 200 can be increased or decreased according to the required adjustable load range.

[0054] In one embodiment, please refer to Figure 4 As shown, this system further includes a PLC controller, which is respectively connected to the concentration monitor 101, the flow meter 102, the aeration blower 308, and the solenoid valve. According to the influent water concentration and flow rate monitored by the concentration monitor 101 and the flow meter 102, the PLC controller controls the automatic opening and closing of the aeration blower 308 and the solenoid valve to realize the automatic adjustment of the sewage treatment load.

[0055] In one embodiment, the concentration monitor 101 is an ammonia nitrogen monitor, a COD monitor, or a TN monitor. The concentration monitor 101 can select the monitor according to needs.

[0056] In one embodiment, please refer to Figure 3 As shown, when the biochemical reaction device 300 is set as an anoxic tank at the end of the sewage treatment path, a membrane tank 400 is arranged downstream of the biochemical reaction device 300, and the membrane tank 400 is provided with an aeration blower 308.

[0057] Specifically, the membrane tank 400 is further provided with a nitrification liquid reflux pipeline 401, and the nitrification liquid reflux pipeline 401 is connected to the mixing zone 204.

[0058] In one embodiment, please refer to Figure 1 、 2 As shown, when the biochemical reaction device 300 is set as an aerobic tank at the end of the sewage treatment path, a secondary sedimentation tank 500 is arranged downstream of the biochemical reaction device 300.

[0059] Specifically, the secondary sedimentation tank 500 is provided with a sludge reflux pipeline 501, and the aerobic tank at the end of the sewage treatment path in the biochemical reaction device 300 is provided with a nitrification liquid reflux pipeline 401. Both the sludge reflux pipeline 501 and the nitrification liquid reflux pipeline 401 are connected to the mixing zone 204.

[0060] In one embodiment, fillers 307 are arranged in the anoxic tank and the aerobic tank. The fillers 307 can lock part of the microorganisms, which is convenient for quickly starting the system when the system load fluctuates later and reducing the sludge acclimation growth time.

[0061] The above-described embodiments introduce in detail the structure of the variable-load influent sewage treatment system. The following embodiments will briefly introduce the usage method of this system, that is, the variable-load influent sewage treatment method.

[0062] The variable-load influent sewage treatment method includes the following steps:

[0063] Step S1. Start the sewage treatment system, the sewage enters the mixing zone 204 of the water distribution device 200 through the water inlet pipe 100, and monitors the concentration and flow of the sewage;

[0064] Step S2. Open the first solenoid valve 211 on the first water distribution pipe 208, and the sewage is mixed with the returned sludge and nitrification liquid in the mixing area 204. As the water level rises, the sewage climbs over the first baffle 201 and enters the first water outlet area 205, and then enters the first anoxic tank 302 from the first water outlet area 205, where it undergoes a denitrification reaction with the nitrification liquid to remove nitrogen, and then is treated in the first aerobic tank 301 and the second sedimentation tank 500 before being discharged in compliance with the standards; or treated in the membrane tank 400 before being discharged in compliance with the standards;

[0065] Step S3. When the concentration or flow rate of sewage increases, and the volume load required for sewage treatment reaches a certain set value, the first solenoid valve 211 is closed, and the second solenoid valve 212 on the second water distribution pipe 209 is opened, and the sewage goes over the second partition 202 and enters the second water outlet area 206, and enters the second anoxic tank 304 from the second water outlet area 206, and then is treated in the second aerobic tank 303, the first anoxic tank 302, the first aerobic tank 301 and the second sedimentation tank 500 in sequence, and then meets the discharge standard; or after being treated in the second aerobic tank 303, the first anoxic tank 302, and the membrane tank 400, it meets the discharge standard, thereby increasing the volume and increasing the impact load of the system;

[0066] Step S4. Similar to step S3, when the concentration or flow rate of sewage continues to increase, after the volume load required for sewage treatment reaches a certain set value, the second solenoid valve 212 is closed, and the solenoid valves on the subsequent water distribution pipes are opened to increase the number of anoxic tanks and aerobic tanks in operation to increase the volume and increase the impact load of the system;

[0067] Step S5. When the volume load required for the later sewage treatment is reduced to the set value, the reverse adjustment will be made, the front-end anoxic tank and aerobic tank will enter the idle period, and the number of anoxic tanks and aerobic tanks in operation will be reduced to achieve volume reduction and adjust the impact load.

[0068] In one embodiment, in step S1, before the sewage treatment system is operated, only the first anoxic tank 302 and the first aerobic tank 301 are operated with sludge, and after the load is increased, the sludge is gradually distributed to the anoxic tank and the aerobic tank of the previous process section.

[0069] In a specific implementation, see Figure 1As shown in the figure, there are three partitions arranged in sequence along the sewage treatment path inside the water distribution device 200, namely the first partition 201, the second partition 202, and the third partition 203; the three partitions divide the water distribution device 200 into a mixing zone 204 and three water outlet zones, and the three water outlet zones are the first water outlet zone 205, the second water outlet zone 206, and the third water outlet zone 207 respectively. The biochemical reaction device 300 has three anoxic tanks and three aerobic tanks. Among them, the first water outlet zone 205 at the upstream and front end of the sewage treatment path in the water distribution device 200 is connected to the first anoxic tank 302 at the downstream and end of the sewage treatment path in the biochemical reaction device 300, and the remaining water outlet zones are sequentially connected to the remaining anoxic tanks in corresponding order. Specifically, the first anoxic tank 302 is connected to the first water outlet zone 205 through the first water distribution pipe 208, and a first solenoid valve 211 is arranged on the first water distribution pipe 208; the second anoxic tank 304 is connected to the second water outlet zone 206 through the second water distribution pipe 209, and a second solenoid valve 212 is arranged on the second water distribution pipe 209; the third anoxic tank 306 is connected to the third water outlet zone 207 through the third water distribution pipe 210, and a third solenoid valve 213 is arranged on the third water distribution pipe 210; the biochemical reaction device 300 is set as an aerobic tank at the end of the sewage treatment path, and a secondary sedimentation tank 500 is arranged downstream of it.

[0070] Specifically, the sewage treatment system is started, the first solenoid valve 211 on the first water distribution pipe 208 is opened, and the sewage enters the mixing area 204 of the water distribution device 200 from the water inlet pipe 100, and the concentration and flow of the sewage are monitored at the same time; the sewage is mixed with the returned sludge and nitrification liquid in the mixing area 204, and as the water level rises, it climbs over the first partition 201 and enters the first water outlet area 205, and enters the first anoxic tank 302 from the first water outlet area 205, where it undergoes a denitrification reaction with the nitrification liquid to remove nitrogen, and then undergoes nitrification and carbon removal reactions in the first aerobic tank 301, and then is treated in the second sedimentation tank 500 and discharged in compliance with the standards; when the concentration or flow of the sewage increases, after the volume load required for sewage treatment reaches a certain set value, the first solenoid valve 211 is closed, and the second solenoid valve 212 on the second water distribution pipe 209 is opened, and the sewage climbs over the second partition 202 and enters the second water outlet area 2 06, enters the second anoxic tank 304 from the second outlet area 206, and then enters the second aerobic tank 303, the first anoxic tank 302, and the first aerobic tank 301 in sequence, and then is treated in the second sedimentation tank 500, and is discharged in compliance with the standards, thereby increasing the volume and increasing the impact load of the system; when the concentration or flow rate of the sewage continues to increase, and the volume load required for sewage treatment reaches a certain set value, the second solenoid valve 212 is closed, and the third solenoid valve 213 on the third water distribution pipe 210 is opened, and the sewage crosses the third partition plate 203 and enters the third outlet area 207, and enters the third anoxic tank 306 from the third outlet area 207, and then enters the third aerobic tank 305, the second anoxic tank 304, the second aerobic tank 303, the first anoxic tank 302, and the first aerobic tank 301 in sequence, and then is treated in the second sedimentation tank 500, and is discharged in compliance with the standards, thereby increasing the volume and increasing the impact load of the system. Similarly, when the system load is reduced to the set value in the later stage, the third solenoid valve 213 is closed, the second solenoid valve 212 is opened, and the sewage enters the biochemical reaction equipment 300 from the second water outlet area 206 for biochemical treatment. When the system load continues to be reduced to the set value, the second solenoid valve 212 is closed, the first solenoid valve 211 is opened, and the sewage enters the biochemical reaction equipment 300 from the first water outlet area 205 for biochemical treatment, thereby reducing the volume and adjusting the impact load.

[0071] In another specific embodiment, see Figure 2As shown, two successively rising partitions are arranged inside the water distribution device 200 along the sewage treatment path, namely the first partition 201 and the second partition 202; the two partitions divide the water distribution device 200 into a mixing area 204 and two water outlet areas, and the two water outlet areas are respectively the first water outlet area 205 and the second water outlet area 206. The biochemical reaction equipment 300 has two anoxic tanks and two aerobic tanks, wherein the first water outlet area 205 located at the upstream end of the sewage treatment path in the water distribution device 200 is connected to the first anoxic tank 302 at the downstream end of the sewage treatment path in the biochemical reaction equipment 300, and the remaining water outlet areas are connected to the remaining anoxic tanks in sequence. Specifically, the first anoxic tank 302 is connected to the first water outlet area 205 through the first water distribution pipe 208, and the first water distribution pipe 208 is provided with a first solenoid valve 211; the second anoxic tank 304 is connected to the second water outlet area 206 through the second water distribution pipe 209; the second solenoid valve 212 is provided on the second water distribution pipe 209 (the second solenoid valve 212 may not be provided on the second water distribution pipe 209, and the adjustment can be achieved by controlling the switch of the first solenoid valve 211). The biochemical reaction equipment 300 is set as an aerobic tank at the end of the sewage treatment path, and the downstream thereof is set as a secondary sedimentation tank 500.

[0072] Specifically, the sewage treatment system is started, and the first solenoid valve 211 on the first water distribution pipe 208 is opened, and the sewage enters the mixing area 204 of the water distribution device 200 from the water inlet pipe 100, and the concentration and flow of the sewage are monitored at the same time; the sewage is mixed with the returned sludge and nitrification liquid in the mixing area 204, and as the water level rises, it climbs over the first partition 201 and enters the first water outlet area 205, and enters the first anoxic tank 302 from the first water outlet area 205, where it undergoes a denitrification reaction with the nitrification liquid to remove nitrogen, and then undergoes nitrification and carbon removal reactions in the first aerobic tank 301, and then is treated in the secondary sedimentation tank 500 and discharged in compliance with the standards; when the concentration or flow of the sewage continues to increase, the volume load required for sewage treatment increases. After the load reaches a certain set value, the first solenoid valve 211 is closed, and the second solenoid valve 212 is opened, and the sewage goes over the second partition 202 and enters the second water outlet area 206, and enters the second anoxic tank 304 from the second water outlet area 206, and then enters the second aerobic tank 303, the first anoxic tank 302, and the first aerobic tank 301 in sequence, and then is treated in the second sedimentation tank 500, and is discharged in compliance with the standards, thereby increasing the volume and increasing the impact load of the system; similarly, when the system load is reduced to the set value in the later stage, the first solenoid valve 211 is opened, and the second solenoid valve 212 is closed, and the sewage enters the biochemical reaction equipment 300 from the first water outlet area 205 for biochemical treatment, thereby reducing the volume and adjusting the impact load.

[0073] In another specific embodiment, see Figure 3As shown, two successively rising partitions are arranged inside the water distribution device 200 along the sewage treatment path, namely the first partition 201 and the second partition 202; the two partitions divide the water distribution device 200 into a mixing area 204 and two water outlet areas, and the two water outlet areas are respectively the first water outlet area 205 and the second water outlet area 206. The biochemical reaction equipment 300 has two anoxic tanks (or one anaerobic tank and one anoxic tank) and one aerobic tank, wherein the first water outlet area 205 located at the upstream head end of the sewage treatment path in the water distribution device 200 is connected to the first anoxic tank 302 at the downstream end of the sewage treatment path in the biochemical reaction equipment 300, and the remaining water outlet areas are sequentially corresponding and connected to the remaining anoxic tanks. Specifically, the first anoxic tank 302 is connected to the first water outlet area 205 through a first water distribution pipe 208, and the first water distribution pipe 208 is provided with a first solenoid valve 211; the second anoxic tank 304 is connected to the second water outlet area 206 through a second water distribution pipe 209, and the second solenoid valve 212 is provided on the second water distribution pipe 209 (the second solenoid valve 212 may not be provided on the second water distribution pipe 209, and the adjustment can be achieved by controlling the switch of the first solenoid valve 211); the biochemical reaction equipment 300 is set as an anoxic tank at the end of the sewage treatment path, and a membrane tank 400 is set downstream thereof.

[0074] Specifically, the sewage treatment system is started, and the first solenoid valve 211 on the first water distribution pipe 208 is opened, and the sewage enters the mixing area 204 of the water distribution device 200 from the water inlet pipe 100, and the concentration and flow of the sewage are monitored at the same time; the sewage is mixed with the returned sludge and nitrification liquid in the mixing area 204, and as the water level rises, it climbs over the first partition 201 and enters the first water outlet area 205, and enters the first anoxic tank 302 from the first water outlet area 205, where it undergoes a denitrification reaction with the nitrification liquid to remove nitrogen, and then enters the membrane tank 400, and after being treated by the membrane tank 400, it meets the discharge standards; when the concentration or flow of the sewage continues to increase, the volume load required for sewage treatment After reaching a certain set value, the first solenoid valve 211 is closed, and the second solenoid valve 212 is opened. The sewage flows over the second partition 202 and enters the second water outlet area 206, and then enters the second anoxic tank 304 from the second water outlet area 206, and then enters the second aerobic tank 303 and the first anoxic tank 302 in sequence, and then is treated by the membrane tank 400 to meet the discharge standards, thereby increasing the volume and increasing the impact load of the system. Similarly, when the system load is reduced to the set value in the later stage, the first solenoid valve 211 is opened, and the second solenoid valve 212 is closed, and the sewage enters the biochemical reaction equipment 300 from the first water outlet area 205 for biochemical treatment, thereby reducing the volume and adjusting the impact load.

[0075] The variable-load influent sewage treatment system of the present application can adjust the operation quantity of the anoxic tank and the aerobic tank according to the influent water quality and quantity of sewage, and then adjust the treatment volume of the biochemical reaction device 300, and carry out mixing and rectification through the partition plate to ensure that the system reaches a stable and qualified effluent water quality, and can be widely applied to the rural, municipal, and mixed sewage treatment fields with large fluctuations in water quality and quantity.

[0076] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A variable load influent sewage treatment system, characterized in that, include: A water inlet pipe, on which a concentration monitor and a flow meter are provided; A water distribution device, wherein a plurality of successively rising partitions are arranged inside the water distribution device along the sewage treatment path, dividing the water distribution device into a mixing zone and a plurality of water outlet zones; the mixing zone is located upstream of the water outlet zone on the sewage treatment path and is connected to the water inlet pipe; The biochemical reaction equipment is located downstream of the water distribution device on the sewage treatment path, and has a plurality of anoxic tanks and aerobic tanks, wherein the anoxic tanks and aerobic tanks are arranged in sequence at intervals on the sewage treatment path; and the aerobic tanks are all provided with an aeration fan; The outlet area at the upstream end of the sewage treatment path in the water distribution device is connected to the anoxic pool at the downstream end of the sewage treatment path in the biochemical reaction equipment, and the remaining outlet areas are connected to the remaining anoxic pools in sequence; and the outlet area is connected to the anoxic pool through a water distribution pipe, and a solenoid valve is provided on the water distribution pipe; When the biochemical reaction device is set as an anoxic tank at the end of the sewage treatment path, the downstream of the biochemical reaction device is set as a membrane tank, and the membrane tank is provided with a nitrification liquid return pipe connected to the mixing zone; When the biochemical reaction device is set as an aerobic tank at the end of the sewage treatment path, the downstream of the biochemical reaction device is set as a secondary sedimentation tank; the secondary sedimentation tank is provided with a sludge return pipeline, and the aerobic tank at the end of the sewage treatment path in the biochemical reaction device is provided with a nitrification liquid return pipeline, and the sludge return pipeline and the nitrification liquid return pipeline are both connected to the mixing zone; The treatment method of the variable load inlet sewage treatment system comprises the following steps: Step S1. Start the sewage treatment system, the sewage enters the mixing zone of the water distribution device through the water inlet pipe, and monitors the concentration and flow of the sewage; Step S2. Open the first solenoid valve on the first water distribution pipe, and the sewage is mixed with the returned sludge and nitrification liquid in the mixing area. As the water level rises, the sewage climbs over the first baffle and enters the first water outlet area, and then enters the first anoxic tank from the first water outlet area, where it undergoes a denitrification reaction with the nitrification liquid to remove nitrogen, and then is treated in the first aerobic tank and the second sedimentation tank before being discharged in compliance with the standards; or treated in the membrane tank before being discharged in compliance with the standards; Step S3. When the concentration or flow rate of sewage increases, and the volume load required for sewage treatment reaches a certain set value, the first solenoid valve is closed, and the second solenoid valve on the second water distribution pipe is opened, and the sewage goes over the second baffle into the second water outlet area, and then enters the second anoxic tank from the second water outlet area, and then is treated in the second aerobic tank, the first anoxic tank, the first aerobic tank, and the second sedimentation tank in sequence, and then meets the discharge standard, or is treated in the second aerobic tank, the first anoxic tank, and the membrane tank, and then meets the discharge standard, so as to achieve volume increase and increase the impact load of the system; Step S4. Similar to step S3, when the concentration or flow rate of sewage continues to increase, after the volume load required for sewage treatment reaches a certain set value, the second solenoid valve is closed, and the solenoid valve on the subsequent water distribution pipeline is opened to increase the number of anoxic tanks and aerobic tanks in operation to increase the volume and increase the impact load of the system; Step S5. When the volume load required for subsequent sewage treatment is reduced to the set value, reverse adjustment will be carried out, and the front-end anoxic tank and aerobic tank will enter the idle period, reducing the number of operating anoxic tanks and aerobic tanks to achieve volume reduction and adjust the shock load.

2. The variable-load influent sewage treatment system according to claim 1, wherein The system further includes a PLC controller, which is respectively connected to the concentration monitor, flowmeter, aeration blower, and solenoid valve; the PLC controller can control the opening or closing of the aeration blower and solenoid valve according to the monitoring data of the concentration monitor and flowmeter.

3. The variable-load influent sewage treatment system according to claim 1, wherein, The concentration monitor is an ammonia nitrogen monitor, COD monitor or TN monitor.

4. The variable-load influent sewage treatment system according to claim 1, wherein An aeration blower is provided in the membrane tank.

5. The variable-load influent sewage treatment system according to claim 1, characterized in that Packings are provided in both the anoxic tank and the aerobic tank.

6. The variable-load influent sewage treatment system according to claim 1, wherein In Step S1, before the sewage treatment system operates, only the first anoxic tank and the first aerobic tank are put into sludge operation, and the sludge is gradually evenly distributed to the remaining anoxic tanks and aerobic tanks after the load is increased.

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