Sludge internal circulation type AOA three-stage ecological pond pollution rainwater treatment system and method

Abstract

The application provides a sludge internal circulation type AOA three-stage ecological pond pollution rainwater treatment system and method, relates to the field of sewage treatment, and solves the technical problems that a stable anaerobic-aerobic-anoxic microenvironment is difficult to be constructed in a traditional oxidation pond and deep denitrification and phosphorus removal are difficult to be realized. The system comprises a conveying module, a treatment module and a sludge directional circulation module. The conveying module is composed of an inlet, a grid, a lifting pump and a pipeline; the treatment module comprises anaerobic, aerobic and facultative sections in sequence, and each section is separated by a partition wall; the sludge directional circulation module adopts a double reflux system, sludge is sent to the front end of the anaerobic section and the front end of the facultative section through a sludge pump and a reflux pipe, directional reflux of the sludge is realized, carbon source utilization is optimized, sludge discharge and phosphorus removal are realized, and the system is suitable for decentralized sewage treatment. The application is used in the process of sewage treatment.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment, and in particular to a sludge internal circulation type AOA three-stage ecological pond pollution rainwater treatment system and method. Background Technology

[0002] Oxidation ponds, as a classic wastewater treatment technology, primarily rely on a solar-driven natural purification process. They remove pollutants through algal-bacterial symbiosis, plant absorption, microbial degradation, and natural sedimentation, offering significant advantages such as low energy consumption, simple management and maintenance, and eco-friendliness. They are widely used in rural areas, small towns, and decentralized wastewater treatment scenarios. However, traditional single-stage or multi-stage series oxidation ponds have significant limitations in treatment efficiency, particularly in the deep removal of nutrients such as nitrogen and phosphorus, failing to meet increasingly stringent environmental emission standards. The fundamental reason lies in the uneven hydraulic mixing state within traditional oxidation ponds, making it difficult to form and maintain stable differentiated microenvironments such as anaerobic, anoxic, and aerobic environments. This limits the synergistic effect of nitrogen and phosphorus removal microbial communities, while also requiring carbon sources, and biological phosphorus removal itself has limitations. Therefore, combining the highly efficient nitrogen and phosphorus removal mechanism of the AOA (Automatic Aeration) process with the ecological treatment advantages of oxidation ponds, and designing an AOA system structure suitable for the hydraulic and ecological characteristics of oxidation ponds, especially through innovative engineering optimization of sludge return paths, functional zone layouts, and sludge discharge strategies, has become a key technical bottleneck for improving the treatment efficiency of oxidation ponds. Summary of the Invention

[0003] This application provides a sludge-internal circulation type AOA three-stage ecological pond pollution rainwater treatment system and method, which solves the technical problem of existing technologies that make it difficult to construct a stable anaerobic-aerobic-anoxic microenvironment and achieve deep nitrogen and phosphorus removal in oxidation ponds.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] In the first aspect, a sludge internal circulation type AOA three-stage ecological pond pollution rainwater treatment system is provided, including a conveying module for conveying sewage, a treatment module and a sludge directional circulation module;

[0006] The conveying module includes an inlet, a bar screen, a booster pump, and a water delivery pipe, which are connected sequentially from left to right.

[0007] The treatment module is used to degrade and transform harmful pollutants in wastewater using microorganisms; wherein, the treatment module includes an anaerobic section, an aerobic section, and a facultative section; the anaerobic section and the aerobic section are isolated by a first partition wall, and the aerobic section and the facultative section are isolated by a second partition wall; the anaerobic section includes an anaerobic section front end and an anaerobic section rear end; the anaerobic section front end is connected to the booster pump via a water delivery pipeline; the facultative section includes a facultative section front end and a facultative section rear end;

[0008] The sludge directional circulation module uses a sludge return system to directionally circulate and distribute the sludge treated by the treatment module. The sludge directional circulation module includes a first sludge return pipe, a second sludge return pipe, a sludge return pump, and a sludge discharge pipe. The outlet of the first sludge return pipe is connected to the front end of the anaerobic section, the outlet of the second sludge return pipe is connected to the front end of the facultative anaerobic section, and the inlet of the sludge return pump is connected to the front end of the facultative anaerobic section.

[0009] Based on the above technical solution, in the sludge internal circulation type AOA three-stage ecological pond pollution rainwater treatment method provided in this application, the sewage purification structure achieves the synergistic effect of efficient nitrogen and phosphorus removal and ecological restoration through the multi-stage coupling design of "anaerobic-facultative-aerobic" (AOA) and ecological pond. It not only significantly improves the effluent quality and reduces energy consumption and operating costs, but also enhances biodiversity and improves the landscape environment through the aquatic plant system. It has both treatment function and ecological aesthetics, and has comprehensive advantages such as strong resistance to shock loads, simple maintenance, and green environmental protection. It is suitable for a variety of decentralized sewage treatment scenarios.

[0010] In conjunction with the first aspect above, in one possible implementation, the cross-sectional shapes of the anaerobic section, the aerobic section, and the facultative anaerobic section are all trapezoidal;

[0011] Water-resistant layers are provided at the front end of the anaerobic section, the rear end of the anaerobic section, the bottom of the aerobic section, the slope of the facultative section, and the embankment of the anaerobic section.

[0012] In conjunction with the first aspect above, in one possible implementation, a perforated flow stabilizing wall is provided at the front end of the anaerobic section, and a sludge layer is provided at the bottom of the front end of the anaerobic section; a mixer is provided at the bottom of the rear end of the anaerobic section.

[0013] In conjunction with the first aspect mentioned above, in one possible implementation, an aeration system is provided at the bottom of the aerobic section, which is supplied with air by a blower system and powered by a solar panel.

[0014] In conjunction with the first aspect above, in one possible implementation, an aeration system two and a soil layer are provided at the bottom of the rear end of the facultative section. The aeration system two is supplied with air by a blower system two and powered by a solar panel two. Aquatic plants are planted in the soil layer. A clarification zone is provided at the end of the rear end of the facultative section. The clarification zone consists of a partition wall three and a perforated flow stabilizing wall at the end, and the perforated flow stabilizing wall at the end is provided with a drainage outlet.

[0015] In conjunction with the first aspect above, in one possible implementation, the sludge return system includes a first sludge return unit, a second sludge return unit, and a sludge discharge unit.

[0016] The first sludge return unit is used to transport sludge that has undergone sufficient denitrification and has an extremely low nitrate concentration to the beginning of the anaerobic section; its inlet is precisely located at the rear end of the facultative anaerobic section, and its outlet is precisely located at the front end of the anaerobic section.

[0017] The second sludge return unit is used to return the sludge at the end of the facultative anaerobic section to the beginning of the facultative anaerobic section in order to maintain the microbial concentration and denitrification activity; its inlet is located at the rear end of the facultative anaerobic section and its outlet is located at the front end of the facultative anaerobic section.

[0018] The sludge discharge unit is used to periodically discharge sludge. Its inlet is located at the rear end of the facultative anaerobic section, and its outlet is a sludge discharge pipe.

[0019] In conjunction with the first aspect above, in one possible implementation, the sludge return pipe one and sludge return pipe two are connected to the sludge discharge pipe and the sludge return pump, and a four-way valve is provided at the connection between the sludge return pipe one, the sludge return pipe two and the sludge discharge pipe.

[0020] In conjunction with the first aspect above, in one possible implementation, the method for determining the aeration rate of the aeration system in the aerobic section includes:

[0021] The influent flow rate (Q), influent COD, ammonia nitrogen concentration (NH3-N), dissolved oxygen (DO), and oxygen transfer efficiency (OTE) of the aerobic section are monitored by online monitoring instruments. Aeration in the aerobic section is achieved through an intelligent aeration control system. The aerobic section is equipped with a PLAKeco system. ® AI-powered intelligent aeration control system.

[0022] In conjunction with the first aspect above, in one possible implementation, the method for determining the aeration rate of the second aeration system in the anaerobic section includes:

[0023] Dissolved oxygen (DO) and oxygen transfer efficiency (OTE) at the downstream end of the anaerobic section are monitored in real time by an online monitoring instrument, and the aeration rate is determined by setting the parameter range.

[0024] Secondly, this application provides a sludge-recirculating AOA three-stage ecological pond rainwater treatment device, comprising: a processor and a storage medium; the storage medium includes instructions, and the processor is used to execute the instructions to implement the method described in the first aspect and any possible implementation thereof. This sludge-recirculating AOA three-stage ecological pond rainwater treatment device can be an electronic device or a chip within an electronic device.

[0025] Thirdly, this application provides a method for treating polluted rainwater using a sludge-internal circulation AOA three-stage ecological pond, including:

[0026] Wastewater enters the inlet, passes through the screen, and is transported by the lift pump to the front end of the anaerobic section through the water pipeline. It is then mixed with the sludge returning from the sludge return pipe by a mixer to complete the phosphorus release and carbon adsorption process, resulting in a mixed liquid.

[0027] The mixed liquor enters the aerobic section, where aeration system one aerates and oxygenates the water, removing COD and ammonia nitrogen, and absorbing phosphorus. The mixed liquor treated in the aerobic section enters the front end of the facultative section, where it mixes with sludge returned from sludge return pipe two. Aquatic plants are planted in the soil layer to create an artificial wetland effect, purifying the water. Finally, the purified water passes through a clarification zone to separate the mud and water, and the clear water is discharged from the drain outlet. Meanwhile, the sludge return pump continuously extracts sludge from the rear end of the facultative section and transports the extracted sludge to the front end of the anaerobic section through sludge return pipe one, to the front end of the facultative section through sludge return pipe two, and discharges sludge through the sludge discharge pipe.

[0028] Fourthly, this application provides a computer-readable storage medium storing instructions that, when executed on a sludge-recirculating AOA three-stage ecological pond rainwater treatment device, cause the sludge-recirculating AOA three-stage ecological pond rainwater treatment device to perform the method described in the first aspect and any possible implementation thereof.

[0029] Fifthly, this application provides a computer program product containing instructions that, when the computer program product is run on a sludge internal circulation type AOA three-stage ecological pond polluted rainwater treatment device, causes the sludge internal circulation type AOA three-stage ecological pond polluted rainwater treatment device to perform the method described in the first aspect and any possible implementation of the first aspect.

[0030] This application provides a sludge-recirculating AOA three-stage ecological pond method and system for treating polluted rainwater. It offers a multi-stage wastewater treatment structure integrating anaerobic-facultative-aerobic processes with an ecological pond, significantly improving treatment efficiency through synergistic functional zone interaction. The anaerobic stage promotes phosphorus release and carbon absorption, the aerobic stage completes organic matter degradation and nitrification, the facultative stage achieves denitrification, and the ecological pond utilizes plant absorption, microbial attachment, and natural reoxygenation to deeply remove nitrogen and phosphorus, ensuring stable effluent compliance. The system employs a precise aeration model and micro-aeration technology, dynamically adjusting air volume according to load to significantly reduce energy consumption and achieve deep nitrogen and phosphorus removal. The ecological pond constructs a healthy ecosystem, enhances biodiversity, and provides aesthetic appeal, being odorless and noise-free, avoiding NIMBY (Not In My Backyard) effects. The overall structure is compact, highly resistant to shock loads, and combined with online monitoring and intelligent control, it operates stably and is easy to maintain. It is suitable for decentralized wastewater treatment scenarios in rural areas, towns, and scenic areas, realizing a green transformation from "end-of-pipe treatment" to "ecological recycling."

[0031] It should be understood that the descriptions of technical features, technical solutions, beneficial effects, or similar language in this application do not imply that all features and advantages can be achieved in any single embodiment. Rather, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution, or beneficial effect is included in at least one embodiment. Therefore, the descriptions of technical features, technical solutions, or beneficial effects in this specification do not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions, and beneficial effects described in this embodiment can be combined in any suitable manner. Those skilled in the art will understand that embodiments can be implemented without one or more specific technical features, technical solutions, or beneficial effects of a particular embodiment. In other embodiments, additional technical features and beneficial effects may be identified in specific embodiments that do not embody all embodiments. Attached Figure Description

[0032] Figure 1 A schematic diagram of a sludge internal circulation type AOA three-stage ecological pond pollution rainwater treatment system provided in this application embodiment;

[0033] Figure 2 A schematic diagram of a sludge internal circulation type AOA three-stage ecological pond pollution rainwater treatment method provided in the embodiments of this application;

[0034] Figure 3 This is a schematic diagram of a polluted rainwater treatment device provided in an embodiment of this application;

[0035] Figure 4 This is a schematic diagram of the hardware structure of a polluted rainwater treatment device provided in an embodiment of this application.

[0036] In the diagram: 1. Inlet; 2. Bar screen; 3. Booster pump; 4. Water delivery pipe; 5. Front-end perforated flow stabilizing wall; 6. Sludge return pipe one; 7. Impermeable layer; 8. Front end of anaerobic section; 9. Sludge layer; 10. Mixer; 11. Rear end of anaerobic section; 12. Blower system one; 13. Solar panel one; 14. Partition wall one; 15. Aerobic section; 16. Aeration system one; 17. Partition wall two; 18. Front end of facultative anaerobic section; 19. Sludge return pipe two; 20. Four-way valve; 21. Sludge return pump; 22. Sludge discharge pipe; 23. Soil layer; 24. Aquatic plants; 25. Rear end of facultative anaerobic section; 26. Aeration system two; 27. Clarification zone; 28. Partition wall three; 29. ​​End perforated flow stabilizing wall; 30. Drainage outlet; 31. Blower system two; 32. Solar panel two. Detailed Implementation

[0037] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figure 1 The present application provides a sludge internal circulation type AOA three-stage ecological pond pollution rainwater treatment system, which includes a conveying module, a treatment module and a sludge directional circulation module.

[0039] The conveying module is used to convey sewage;

[0040] The delivery module includes an inlet 1, a bar screen 2, a booster pump 3, and a water delivery pipe 4, which are connected sequentially from left to right.

[0041] The treatment module is used to degrade and transform harmful pollutants in wastewater through the synergistic effect of microorganisms under different environmental conditions.

[0042] The processing module includes an anaerobic section, an aerobic section 15, and a facultative section; wherein, the anaerobic section and the aerobic section 15 are separated by a partition wall 14, and the aerobic section 15 and the facultative section are separated by a partition wall 2 17.

[0043] Furthermore, the anaerobic section includes an anaerobic section front end 8 and an anaerobic section rear end 11; the anaerobic section front end 8 is connected to the booster pump 3 via a water conveyance pipe 4.

[0044] The front end 8 of the anaerobic section is provided with a front perforated flow stabilizing wall 5, and the bottom of the front end 8 of the anaerobic section is provided with a sludge layer 9; the bottom of the rear end 11 of the anaerobic section is provided with a mixer 10.

[0045] The bottom of the aerobic section 15 is equipped with an aeration system 16, which is supplied with air by a blower system 12 and powered by a solar panel 13.

[0046] The method for determining the aeration rate of aeration system 16 in aerobic section 15 includes:

[0047] The influent flow rate (Q), influent COD, ammonia nitrogen concentration (NH3-N), dissolved oxygen (DO), and oxygen transfer efficiency (OTE) of aerobic section 15 are monitored by an online monitoring instrument. Aeration in aerobic section 15 is carried out through an intelligent aeration control system. Aerobic section 15 is equipped with a PLAKeco system. ® AI-powered intelligent aeration control system.

[0048] Based on the above technical solution, the aeration rate of aerobic section 15 is determined by online monitoring of influent flow and key water quality parameters, combined with the PLAKeco® AI intelligent aeration control system, achieving intelligent and precise aeration control. The traditional "constant aeration" or "DO threshold start / stop" is replaced by "on-demand quantitative aeration." This method not only effectively avoids energy waste at low loads and insufficient oxygen supply at high loads, significantly reducing system energy consumption, but also ensures the stability of effluent quality, improving the operating efficiency, energy saving level, and shock resistance of the wastewater treatment system.

[0049] The anoxic section includes an anoxic section front end 18 and an anoxic section rear end 25;

[0050] At the bottom of the facultative section 25, an aeration system 26 and a soil layer 23 are provided, and aquatic plants 24 are planted in the soil layer 23. At the end of the facultative section 25, an aeration system 26 and a soil layer 23 are provided, and aquatic plants 24 are planted in the soil layer 23. At the end of the facultative section 25, a clarification zone 27 is provided, which consists of a partition wall 28 and a perforated flow stabilizing wall 29 at the end, and the perforated flow stabilizing wall 29 at the end is provided with a drain outlet 30.

[0051] Among them, aeration system 26 is supplied with air by fan system 21 and powered by solar panel 22; the method for determining the aeration volume of aeration system 26 in the anaerobic section 25 includes:

[0052] Dissolved oxygen (DO) and oxygen transfer efficiency (OTE) at the downstream end of the anaerobic section are monitored in real time using an online monitoring instrument. The aeration rate is determined by setting the parameter range.

[0053] Based on the above technical solution, the aeration control method of the facultative anaerobic section 25 achieves scientific and quantitative regulation of aeration volume through feedback based on dissolved oxygen (DO) and oxygen transfer efficiency (OTE). While ensuring a stable facultative anaerobic environment, it avoids the problems of excessive or insufficient oxygen supply caused by traditional empirical aeration. Furthermore, it comprehensively considers the actual oxygen demand of the system and the oxygen transfer capacity of the equipment. This not only effectively maintains the micro-oxygen requirements of denitrifying bacteria and the root zone of aquatic plants, preventing sludge putrefaction and excessive inhibition of denitrification, but also significantly improves oxygen utilization efficiency and reduces energy consumption. It achieves synergistic optimization of precise air supply, energy saving, and stable denitrification in the wastewater treatment process.

[0054] It should be noted that the cross-sectional shapes of the anaerobic section, the aerobic section 15, and the facultative anaerobic section are all trapezoidal.

[0055] In addition, the bottom, slope and embankment of the anaerobic section front end 8, the anaerobic section rear end 11, the aerobic section 15 and the facultative section front end 18 are all equipped with a waterproof layer 7 made of clay or HDPE geomembrane material.

[0056] Among them, the height of the rear end 25 of the anoxic section is higher than that of the front end 18 of the anoxic section.

[0057] The sludge directional recycling module uses a sludge return system to purposefully circulate and distribute the sludge treated by the treatment module.

[0058] The sludge directional circulation module includes a sludge return pipe 1 6, a sludge return pipe 2 19, a sludge return pump 21, and a sludge discharge pipe 22; the sludge return pipe 1 6, the sludge return pipe 2 19, and the sludge return pump 21 are respectively connected to the sludge discharge pipe 22; and the outlet of the sludge return pipe 1 6 is connected to the front end 8 of the anaerobic section, the outlet of the sludge return pipe 2 19 is connected to the front end 18 of the facultative anaerobic section, and the inlet of the sludge return pump 21 is connected to the front end 18 of the facultative anaerobic section.

[0059] A four-way valve 20 is installed at the connection between sludge return pipe 16, sludge return pipe 29 and sludge discharge pipe 22.

[0060] It should be noted that the four-way valve can easily control the reflux ratio and sludge discharge volume of the two channels. For example, the reflux flow to the anaerobic section and the reflux flow to the anoxic section can be controlled between 1:1 and 1:3.

[0061] The sludge return system includes a first sludge return unit, a second sludge return unit, and a sludge discharge unit. The first sludge return unit has its inlet precisely located at the rear end 25 of the facultative anaerobic section and its outlet precisely located at the front end 8 of the anaerobic section. This unit is used to transport sludge that has undergone sufficient denitrification, has extremely low nitrate concentration, and contains phosphorus to the beginning of the anaerobic section to maintain the microbial concentration and activity in this area. The second sludge return unit also has its inlet located at the rear end 25 of the facultative anaerobic section and its outlet located at the front end 18 of the facultative anaerobic section. This unit is used to return the sludge from the end of the facultative anaerobic section to the beginning of this section, using the sludge itself as a carbon source for denitrifying bacteria to promote denitrification. The sludge discharge unit preferably has its inlet located at the rear end 25 of the facultative anaerobic section. It is used to periodically discharge phosphorus-rich excess sludge to control the system sludge volume and remove the enriched phosphorus from the system.

[0062] It should be noted that the sludge discharge unit, the first sludge return unit, and the second sludge return unit can share a sludge return pump and are connected by a four-way valve 20, thereby achieving flexible and precise control of the two return ratios and sludge discharge.

[0063] Based on the above technical solution, this wastewater treatment structure adopts a multi-stage integrated process combining anaerobic-facultative-aerobic and ecological ponds, fully leveraging the synergistic effect of each functional zone to significantly improve the overall efficiency of wastewater treatment: the anaerobic stage creates favorable conditions for biological phosphorus removal and carbon absorption; the aerobic stage completes organic matter degradation and ammonia nitrification; the facultative stage achieves efficient denitrification; and the ecological pond further removes nitrogen and phosphorus and enhances water purification through aquatic plant absorption, microbial attachment, natural reoxygenation, and the ecological food chain, ensuring stable effluent compliance. The system uses a precise aeration control model and micro-aeration technology to ensure that the aeration is controlled according to actual conditions. The system dynamically adjusts the gas supply based on actual load, significantly reducing energy consumption and operating costs compared to traditional processes. Simultaneously, the ecological pond constructs a healthy natural ecosystem, promoting biodiversity, deeply removing nitrogen and phosphorus, and also serving as a landscaping and environmental integration feature. It is odorless, low-noise, and avoids the NIMBY (Not In My Backyard) effect. The overall structure is compact, with strong resistance to shock loads. Combined with online monitoring and intelligent control, it operates stably and reliably, and is easy to maintain. It is particularly suitable for decentralized wastewater treatment scenarios in rural areas, towns, and scenic spots where environmental requirements are high and land resources are limited, realizing a green transformation of wastewater treatment from "end-of-pipe treatment" to "ecological recycling."

[0064] Please see Figure 2 The second aspect of this invention provides a method for treating polluted rainwater from a sludge-recirculating AOA (Automatic Aeration) three-stage ecological pond, the method comprising the following treatment steps:

[0065] S1: Wastewater enters the anaerobic section and is immediately mixed with sludge returned from the rear end 25 of the facultative anaerobic section via the first sludge return unit. Because the returned sludge has extremely low nitrate content and high phosphorus content, it creates an excellent anaerobic environment for polyphosphate-accumulating bacteria and polysaccharide-accumulating bacteria, enabling them to fully absorb volatile fatty acids and other rapid carbon sources from the influent and complete phosphorus release and carbon absorption. The sludge and wastewater are then thoroughly mixed by the mixer at the rear end 11 of the anaerobic section.

[0066] S2: The mixed liquor enters the aerobic section 15, where further oxidation and degradation of organic matter, nitrification, and aerobic superphosphate uptake by polyphosphate-accumulating bacteria occur.

[0067] S3: The effluent from the aerobic section 15 enters the front end 18 of the facultative section and mixes with the sludge returned here through the second sludge return unit. Denitrifying bacteria utilize the carbon source released by polysaccharide bacteria to denitrify the nitrate nitrogen produced in the aerobic section 15, reducing it to nitrogen gas for discharge, thus achieving deep denitrification.

[0068] S4: Wastewater flows out after passing through the rear end 25 of the facultative anaerobic section, while sludge is returned to the front end 18 of the facultative anaerobic section. The sludge is used as a carbon source for denitrification to achieve denitrification. At the same time, excess sludge is periodically discharged through a sludge discharge unit located at the rear end of the facultative anaerobic section. The sludge here has undergone a complete metabolic cycle and has a high phosphorus content. Sludge discharge can efficiently remove phosphorus and maintain the biological balance of the system.

[0069] The above mainly describes the solutions of the embodiments of this application from the perspective of equipment implementation. It is understood that each device, for example, a sludge internal circulation type AOA three-stage ecological pond polluted rainwater treatment device, includes at least one of the hardware structures and software modules corresponding to the execution of each function in order to achieve the above functions. Those skilled in the art should readily recognize that, in conjunction with the units and algorithm steps of the various examples described in the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed by hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0070] This application embodiment can divide a sludge internal circulation type AOA three-stage ecological pond pollution rainwater treatment device into functional units based on the above method example. For example, each function can be divided into separate functional units, or two or more functions can be integrated into one treatment unit. The integrated unit can be implemented in hardware or software functional units. It should be noted that the unit division in this application embodiment is illustrative and only represents a logical functional division; other division methods may be used in actual implementation.

[0071] When using integrated units, Figure 3 A possible structural schematic diagram of a sludge internal circulation type AOA three-stage ecological pond polluted rainwater treatment device (denoted as polluted rainwater treatment device 50) involved in the above embodiments is shown. The polluted rainwater treatment device 50 includes a processing unit 501 and a communication unit 502, and may also include a storage unit 503. Figure 3 The schematic diagram shown can be used to illustrate the structure of a sludge internal circulation type AOA three-stage ecological pond pollution rainwater treatment device involved in the above embodiments.

[0072] when Figure 3 The schematic diagram shown illustrates the structure of a sludge-internal circulation type AOA three-stage ecological pond rainwater treatment device involved in the above embodiments. The processing unit 501 is used to control and manage the operation of the sludge-internal circulation type AOA three-stage ecological pond rainwater treatment device. The communication unit 502 is used for the sludge-internal circulation type AOA three-stage ecological pond rainwater treatment device to communicate with other devices. The storage unit 503 is used to store the program code and data of the sludge-internal circulation type AOA three-stage ecological pond rainwater treatment device.

[0073] For example, the communication unit 502 is used to complete the degradation and transformation of harmful pollutants in wastewater through the synergistic effect of microorganisms under different environmental conditions;

[0074] The processing unit 501 is used for the purposeful directional circulation and distribution of sludge processed by the processing module.

[0075] The processing unit 501 can be a processor or a controller, and the communication unit 502 can be a communication interface, transceiver, transceiver circuit, transceiver device, etc. The term "communication interface" is a general term and may include one or more interfaces. The storage unit 503 can be a memory. When the polluted rainwater treatment device 50 is a chip, the processing unit 501 can be a processor or a controller, and the communication unit 502 can be an input interface and / or an output interface, pins, or circuits, etc. The storage unit 503 can be a storage unit within the chip (e.g., a register, cache, etc.) or a storage unit located outside the chip (e.g., read-only memory (ROM), random access memory (RAM, etc.).

[0076] The communication unit can also be called a transceiver unit. The antenna and control circuit with transceiver functions in the rainwater treatment device 50 can be considered as the communication unit 502 of the rainwater treatment device 50, and the processor with processing functions can be considered as the processing unit 501 of the rainwater treatment device 50. Optionally, the device in the communication unit 502 that implements the receiving function can be considered as the communication unit, which is used to execute the receiving steps in the embodiments of this application. The communication unit can be a receiver, a receiver circuit, etc. The device in the communication unit 502 that implements the transmitting function can be considered as the transmitting unit, which is used to execute the transmitting steps in the embodiments of this application. The transmitting unit can be a transmitter, a transmitter, a transmitting circuit, etc.

[0077] Figure 3 If the integrated units in the process are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of this application, in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. Storage media for storing computer software products include various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory, random access memory, magnetic disks, or optical disks.

[0078] Figure 3 The units in the process can also be called modules; for example, a processing unit can be called a processing module.

[0079] This application also provides a hardware structure diagram of a sludge internal circulation type AOA three-stage ecological pond polluted rainwater treatment device (denoted as polluted rainwater treatment device 60), see [link to diagram]. Figure 4 The polluted rainwater treatment device 60 includes a processor 601, and optionally, a memory 602 connected to the processor 601.

[0080] In the first possible implementation, see Figure 4 The polluted rainwater treatment device 60 also includes a transceiver 603. The processor 601, memory 602, and transceiver 603 are connected via a bus. The transceiver 603 is used to communicate with other devices or communication networks. Optionally, the transceiver 603 may include a transmitter and a receiver. The device in the transceiver 603 that implements the receiving function can be considered as a receiver, which is used to perform the receiving steps in the embodiments of this application. The device in the transceiver 603 that implements the transmitting function can be considered as a transmitter, which is used to perform the transmitting steps in the embodiments of this application.

[0081] Based on the first possible implementation method Figure 4 The schematic diagram shown can be used to illustrate the structure of a sludge internal circulation type AOA three-stage ecological pond pollution rainwater treatment device involved in the above embodiments.

[0082] in, Figure 4 This can also be illustrated with a system chip in a sludge-recirculating AOA three-stage ecological pond for treating polluted rainwater. In this case, the actions performed by the aforementioned sludge-recirculating AOA three-stage ecological pond for treating polluted rainwater can be implemented by this system chip. The specific actions performed can be found above and will not be repeated here.

[0083] Some of the data in the above formula are calculated by removing dimensions and taking their numerical values. The formula is the closest to the real situation obtained by software simulation of a large amount of collected data. The preset parameters and preset thresholds in the formula are set by those skilled in the art according to the actual situation or obtained through simulation of a large amount of data.

Claims

1. A sludge-internal circulation type AOA three-stage ecological pond pollution rainwater treatment system, characterized in that, It includes a conveying module, a treatment module, and a sludge directional circulation module for transporting wastewater; The conveying module includes an inlet (1), a bar screen (2), a booster pump (3), and a water conveying pipe (4), which are connected sequentially from left to right; The treatment module is used to degrade and transform harmful pollutants in wastewater through microorganisms; wherein, the treatment module includes an anaerobic section, an aerobic section (15) and an anaerobic section; the anaerobic section and the aerobic section (15) are isolated by a partition wall one (14), and the aerobic section (15) and the anaerobic section are isolated by a partition wall two (17); the anaerobic section includes an anaerobic section front end (8) and an anaerobic section rear end (11); the anaerobic section front end (8) is connected to the booster pump (3) through a water conveyance pipe (4); the anaerobic section includes an anaerobic section front end (18) and an anaerobic section rear end (25). The bottom of the aerobic section (15) is provided with an aeration system (16), which is supplied with air by a blower system (12) and powered by a solar panel (13). The cross-sectional shapes of the anaerobic section, the aerobic section (15) and the facultative anaerobic section are all trapezoidal; Water-proof layers (7) are provided on the bottom, slope and embankment of the front end (8) of the anaerobic section, the rear end (11) of the anaerobic section, the aerobic section (15) and the front end (18) of the facultative section. At the bottom of the rear end (25) of the facultative section, an aeration system two (26) and a soil layer (23) are provided. The aeration system two (26) is supplied with air by the fan system two (31) and powered by the solar panel two (32). Aquatic plants (24) are planted in the soil layer (23). At the end of the rear end (25) of the facultative section, a clarification zone (27) is provided. The clarification zone (27) is composed of a partition wall three (28) and a perforated flow stabilizing wall at the end (29). The perforated flow stabilizing wall at the end (29) is provided with a drain outlet (30). The sludge directional circulation module uses a sludge return system to directionally circulate and distribute the sludge treated by the treatment module; wherein, the sludge directional circulation module includes a sludge return pipe one (6), a sludge return pipe two (19), a sludge return pump (21) and a sludge discharge pipe (22); the outlet of the sludge return pipe one (6) is connected to the front end of the anaerobic section (8), the outlet of the sludge return pipe two (19) is connected to the front end of the facultative anaerobic section (18), and the inlet of the sludge return pump (21) is connected to the front end of the facultative anaerobic section (18).

2. The sludge internal circulation type AOA three-stage ecological pond pollution rainwater treatment system according to claim 1, characterized in that, The cross-sectional shapes of the anaerobic section, the aerobic section (15) and the facultative anaerobic section are all trapezoidal; Water-proof layers (7) are provided on the bottom, slope and embankment of the anaerobic section front end (8), the anaerobic section rear end (11), the aerobic section (15) and the facultative section front end (18).

3. The sludge internal circulation type AOA three-stage ecological pond pollution rainwater treatment system according to claim 1, characterized in that, The sludge return system includes a first sludge return unit, a second sludge return unit, and a sludge discharge unit; The first sludge return unit is used to transport sludge that has undergone sufficient denitrification and has an extremely low nitrate concentration to the beginning of the anaerobic section. Its inlet is precisely set at the rear end of the facultative anaerobic section (25), and its outlet is precisely set at the front end of the anaerobic section (8). The second sludge return unit is used to return the sludge at the end of the anaerobic section to the beginning of the anaerobic section in order to maintain the microbial concentration and denitrification activity; its inlet is located at the rear end of the anaerobic section (25), and its outlet is located at the front end of the anaerobic section (18). The sludge discharge unit is used to periodically discharge sludge. Its inlet is located at the rear end of the facultative anaerobic section (25), and its outlet is a sludge discharge pipe (22).

4. The sludge internal circulation type AOA three-stage ecological pond pollution rainwater treatment system according to claim 1, characterized in that, The sludge return pipe one (6), sludge return pipe two (19) and sludge return pump (21) are respectively connected to the sludge discharge pipe (22), and a four-way valve (20) is provided at the connection of the sludge return pipe one (6), the sludge return pipe two (19) and the sludge discharge pipe (22).

5. The sludge internal circulation type AOA three-stage ecological pond pollution rainwater treatment system according to claim 1, characterized in that, The method for determining the aeration rate of the aeration system 1 (16) described in the aerobic section (15) includes: The influent flow rate Q, influent COD, ammonia nitrogen concentration NH3-N, dissolved oxygen DO and oxygen transfer efficiency OTE of the aerobic section (15) are monitored by an online monitoring instrument. The aerobic section (15) is aerated by an intelligent aeration control system. The aerobic section (15) is equipped with a PLAKeco® AI intelligent aeration control system.

6. The sludge internal circulation type AOA three-stage ecological pond pollution rainwater treatment system according to claim 1, characterized in that, The method for determining the aeration rate of the aeration system two (26) described in the anaerobic section (25) includes: Dissolved oxygen (DO) and oxygen transfer efficiency (OTE) at the end of the anaerobic section (25) are monitored in real time by an online monitoring instrument, and the aeration rate is controlled by setting the parameter range.

7. A method for treating rainwater pollution from a sludge-recirculating AOA three-stage ecological pond, based on the operation of a sludge-recirculating AOA three-stage ecological pond rainwater pollution treatment system according to any one of claims 1-6, characterized in that, Includes the following steps: Wastewater enters the inlet (1), passes through the screen (2), and is transported by the lift pump (3) through the water conveyance pipe (4) to the front end (8) of the anaerobic section. It is then mixed with the sludge returned from the sludge return pipe (6) by the mixer (10) to complete the release of phosphorus and absorption of carbon, and obtain a mixed liquid. The mixed liquor enters the aerobic section (15), where aeration system one (16) aerates and oxygenates, removing COD and ammonia nitrogen, and completing phosphorus absorption. The mixed liquor treated in the aerobic section (15) enters the front end of the facultative section (18), where it mixes with the carbon-rich sludge returned from the sludge return pipe two (19). Then, aquatic plants (24) are planted in the soil layer (23) to form an artificial wetland effect and purify the water quality. Finally, the purified water is separated from the mud and water in the clarification zone (27), and the clear water is discharged from the drain outlet (30). The sludge return pump (21) continuously extracts the sludge from the rear end of the facultative section (25) and transports the extracted sludge to the front end of the anaerobic section (8) through sludge return pipe one (6), to the front end of the facultative section (18) through sludge return pipe two (19), and discharges the sludge through the sludge discharge pipe (22).

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