A sewage treatment system and method based on AOA process

Abstract

The present application belongs to the field of sewage treatment, and discloses a sewage treatment system and method based on the AOA process. The system includes a composite plant ecological subsystem, a microbial membrane treatment subsystem, an activated sludge treatment subsystem, a circulation regulation subsystem and an information perception component, as well as a specific sewage treatment method based on the AOA process. The system is based on the AOA process, and through the organic combination of various subsystems and components including the composite plant ecological subsystem, the microbial membrane treatment subsystem, the activated sludge treatment subsystem and the circulation regulation subsystem, supplemented by a specific sewage treatment method based on the AOA process, the sewage treatment process is faster, and the overall system operation efficiency is higher, the life of each component is longer, and the maintenance frequency is lower, which is more suitable for the construction, expansion and upgrading of urban domestic sewage treatment facilities.

Description

Technical Field

[0001] The present application belongs to the field of sewage treatment, and specifically relates to a sewage treatment system and method based on the AOA process. Background Art

[0002] With the rapid development of industrialization and urbanization, the corresponding municipal infrastructure, especially sewage treatment facilities and processes, have become increasingly complete and mature. Despite more than a hundred years of research and application, traditional sewage treatment processes, such as the activated sludge process, have not seen any major revolutionary breakthroughs. As a representative of the activated sludge process, the anaerobic-anoxic-aerobic biological nitrogen and phosphorus removal process (Anaerobic-Anoxic-Oxic), namely A 2 The AOA process has been widely used in my country. Although the process has achieved sewage purification to a certain extent, its nitrogen and phosphorus removal effects are poor, energy consumption is high, and sludge production is large. There is a certain gap between the current social goals of improving the quality, efficiency, and cost of sewage treatment, and reducing energy consumption and carbon emissions. It is in urgent need of applying new technologies for upgrading and transformation. In recent years, the AOA process (i.e., anaerobic / aerobic / anoxic: Anoxic / Oxic / Anoxic process) with phosphorus removal and extreme nitrogen removal from urban sewage as the core has gradually become the focus of technical research.

[0003] For example, Chinese patent application No. 201710739384.2 introduces a decentralized sewage treatment system and its treatment method. 2 O process and membrane aeration technology have realized the miniaturization of sewage treatment systems. 2 The technical solutions of O process and membrane aeration have defects such as large aeration energy consumption per unit treatment scale, easy contamination of membrane components, and difficulty in ensuring aeration uniformity. Their sewage treatment capacity is insufficient compared with the AOA process.

[0004] For another example, Chinese patent application No. 202411527732.6 proposes a sewage treatment method and treatment system that combines the AOA process with effective front-to-back distribution of carbon sources. The device is based on the AOA process and adopts a two-stage denitrification reflux mode, that is, the nitrification liquid is refluxed so that the nitrate that has not completed denitrification can be further denitrified, thereby reducing the concentration of nitrate and total nitrogen in the treated effluent and improving the sewage treatment effect. However, the pre-denitrification directly faces the received sewage, and its ability to adjust to sewage of different concentrations cannot adapt.

[0005] Therefore, in response to the current related problems, it is urgent to develop a new sewage treatment system based on the AOA process. Summary of the invention

[0006] The purpose of this application is to solve the deficiencies of the prior art and provide a sewage treatment system and method based on the AOA process, which specifically adopts the following technical solutions:

[0007] First, the present application provides a sewage treatment system based on the AOA process, including: a composite plant ecological subsystem, a microbial membrane treatment subsystem, an activated sludge treatment subsystem and a circulation regulation subsystem;

[0008] The complex plant ecological subsystem includes emergent plants and wetland fillers;

[0009] The microbial membrane treatment subsystem includes a microbial membrane component and a composite circulation laminar flow regulation component;

[0010] The activated sludge treatment subsystem includes a sludge double return treatment component;

[0011] In the composite plant ecological subsystem, emergent plants are located above the wetland filler, and the wetland filler has a layered structure. At the same time, a pipeline structure for liquid flow is provided in the wetland filler, and is connected to the circulation regulation subsystem through a pipeline;

[0012] In the microbial membrane treatment subsystem, the composite circulation laminar flow regulating component is used to transport water to the microbial membrane component in the form of laminar flow, and the composite circulation laminar flow regulating component is connected to the circulation regulating subsystem through a pipeline;

[0013] The sludge double-return treatment component is connected to the circulation regulation subsystem through pipelines;

[0014] The circulation regulation subsystem controls the liquid flow path between the composite plant ecological subsystem, the microbial membrane treatment subsystem and the activated sludge treatment subsystem;

[0015] The wastewater treatment system based on the AOA process also includes an information sensing component for collecting water body data;

[0016] The information sensing component is used to measure the parameters of the composite plant ecological subsystem, the microbial membrane treatment subsystem, the activated sludge treatment subsystem and the circulation regulation subsystem;

[0017] The sewage treatment system based on the AOA process also includes an overall control component, which controls the composite plant ecological subsystem, the microbial membrane treatment subsystem, the activated sludge treatment subsystem and the circulation regulation subsystem according to water body data.

[0018] In some specific implementations, the wetland filler includes brick red soil and at least one of glass pumice, oyster shells, ceramsite and medical stone.

[0019] In some specific implementations, the microbial membrane assembly includes at least one of a membrane aerated biofilm reactor, a biological contact oxidation tank, and an aerated biological filter.

[0020] In some specific implementations, the sludge double recirculation treatment component includes a continuous flow sludge double recirculation anaerobic / aerobic / anoxic sewage treatment facility.

[0021] In some specific implementations, the information sensing component includes a water quality parameter sensor, a flow sensor, a temperature sensor, and a pressure sensor.

[0022] On the other hand, the present application also provides a sewage treatment method obtained by the above-mentioned sewage treatment system based on the AOA process, comprising:

[0023] The activated sludge treatment subsystem is equipped with anaerobic tanks, aerobic tanks and anoxic tanks;

[0024] S101, the primary sewage to be treated flows into the circulation regulation subsystem, the circulation regulation subsystem reads the parameters of the sewage through the information sensing component, and transports the primary sewage to the activated sludge treatment subsystem;

[0025] S102, the circulation regulating subsystem inputs the primary sewage into the anaerobic tank, and treats it in the anaerobic tank to obtain secondary sewage;

[0026] S103, the circulation regulating subsystem inputs the secondary sewage into the aerobic tank;

[0027] S104, the circulation regulating subsystem inputs a portion of the secondary sewage in the aerobic pool into the microbial membrane treatment subsystem, and the biofilm treatment subsystem treats the secondary sewage to obtain the first branch primary sewage;

[0028] S105, the circulation regulation subsystem inputs the primary sewage of the first branch into the composite plant ecological subsystem, and after being treated by the composite plant ecological subsystem, the secondary sewage of the first branch is obtained;

[0029] S106, the circulation regulation subsystem transports the secondary sewage from the first branch back to the aerobic tank and mixes it with the secondary sewage;

[0030] S107, the secondary sewage is treated in an aerobic tank to obtain tertiary sewage;

[0031] Comparative treatment of nitrogen content ratios of primary and tertiary effluents;

[0032] When the ratio of nitrogen content in primary sewage to nitrogen content in tertiary sewage is 1.8-2.8, the tertiary sewage is input into the anoxic tank for treatment and further purified to obtain reclaimed water.

[0033] In some specific implementations, after executing step S108, the following steps are further included:

[0034] When the ratio of nitrogen content in primary sewage to nitrogen content in tertiary sewage is 1.1-1.8, the circulation regulation subsystem inputs the secondary sewage in the aerobic pool into the composite plant ecological subsystem to obtain ecological treated water C1, and then inputs the ecological treated water C1 into the biofilm treatment subsystem to obtain membrane treated water C2, which is the reclaimed water.

[0035] In some specific implementations, after executing step S108, the following steps are further included:

[0036] When the ratio of nitrogen content in primary sewage to nitrogen content in tertiary sewage is lower than 1.1, the circulation regulation subsystem inputs the secondary sewage in the aerobic pool into the composite plant ecological subsystem, and after being treated by the composite plant ecological subsystem, it becomes reclaimed water.

[0037] In some specific implementations, after executing step S108, the following steps are further included:

[0038] When the ratio of the phosphorus content in the primary sewage to the phosphorus content in the tertiary sewage is greater than 3.5, steps S104-S106 are cycled multiple times until the ratio of the phosphorus content in the secondary sewage to the tertiary sewage is less than 2.

[0039] In some specific implementations, after step S104, the following steps are further included:

[0040] Comparison of nitrogen content between primary and secondary effluent concentrations in the first branch;

[0041] When the ratio of the nitrogen content of the primary sewage in the first branch to the concentration of the secondary sewage is greater than 0.9, steps S104-S106 are canceled; the microbial membrane treatment subsystem stops working, and the administrator is notified through the overall control component to carry out maintenance.

[0042] The beneficial effects of the present application are as follows: the system is based on the AOA process, and through the organic combination of various subsystems and their components including the composite plant ecological subsystem, the microbial membrane treatment subsystem, the activated sludge treatment subsystem and the circulation regulation subsystem, supplemented by a specific sewage treatment method based on the AOA process, the sewage treatment process is faster, and at the same time, the overall system operation efficiency is higher, the life of each component is longer, the maintenance frequency is lower, and it is more suitable for new construction, expansion and upgrading of urban domestic sewage treatment facilities and other project applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural diagram of a sewage treatment system based on the AOA process;

[0044] Figure 2 is another structural schematic diagram of the sewage treatment system;

[0045] in Figure 2Since the microbial membrane treatment subsystem 200 and the circulation regulation subsystem 400 are not visible at this angle, their positions are only indicated by markings;

[0046] Legend: 100 complex plant ecological subsystem; 200 microbial membrane treatment subsystem; 300 activated sludge treatment subsystem; 400 circulation regulation subsystem;

[0047] 301 anaerobic tank; 302 aerobic tank; 303 anoxic tank; 304 sedimentation tank; 305 air pump. DETAILED DESCRIPTION

[0048] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of this application, so as to fully understand the purpose, scheme and effect of this application. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other without conflict.

[0049] It should be noted that all directional indications in this embodiment (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0050] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] Combined with Figure 1 The schematic diagram of the sewage treatment system based on the AOA process is shown, and Figure 2 Another structural schematic diagram of the sewage treatment system shown in FIG. Figure 2 The microbial film treatment subsystem 200 and the circulation regulation subsystem 400 cannot be shown due to location reasons, and only their approximate locations are indicated by labels.

[0053] First, the present application provides a sewage treatment system based on the AOA process, including: a composite plant ecological subsystem 100, a microbial membrane treatment subsystem 200, an activated sludge treatment subsystem 300 and a circulation regulation subsystem 400;

[0054] The complex plant ecological subsystem 100 includes emergent plants and wetland fillers;

[0055] The microbial membrane treatment subsystem 200 includes a microbial membrane component and a composite circulation laminar flow regulating component;

[0056] The activated sludge treatment subsystem 300 includes a sludge double return treatment component;

[0057] In the composite plant ecological subsystem 100, emergent plants are located above the wetland filler, and the wetland filler has a layered structure. At the same time, a pipeline structure for liquid flow is provided in the wetland filler, and is connected to the circulation regulation subsystem 400 through a pipeline;

[0058] In the microbial membrane treatment subsystem 200, the composite circulation laminar flow regulating component is used to transport water to the microbial membrane module in the form of laminar flow, and the composite circulation laminar flow regulating component is connected to the circulation regulating subsystem 400 through a pipeline;

[0059] The sludge double-return treatment component is connected to the circulation regulation subsystem 400 through a pipeline;

[0060] The circulation regulating subsystem 400 controls the liquid flow path between the composite plant ecological subsystem 100, the microbial membrane treatment subsystem 200 and the activated sludge treatment subsystem 300;

[0061] The wastewater treatment system based on the AOA process also includes an information sensing component for collecting water body data;

[0062] The information sensing component is used to measure the parameters of the composite plant ecological subsystem 100, the microbial membrane treatment subsystem 200, the activated sludge treatment subsystem 300 and the circulation regulation subsystem 400;

[0063] The sewage treatment system based on the AOA process also includes an overall control component, which controls the composite plant ecological subsystem 100, the microbial membrane treatment subsystem 200, the activated sludge treatment subsystem 300 and the circulation regulation subsystem 400 according to water body data.

[0064] The composite plant ecological subsystem 100 can effectively purify sewage while allowing some bacteria therein to reproduce in its filler, thereby effectively increasing the bacterial concentration during the sewage circulation treatment, thereby increasing the sewage treatment capacity of the overall system.

[0065] The microbial membrane treatment subsystem 200 in this application can make up for the shortcomings of the AOA activated sludge treatment process in terms of sewage treatment timeliness. When a large amount of sewage flows in, the microbial membrane treatment subsystem can increase the sewage treatment speed, thereby avoiding overload of sewage treatment facilities. At the same time, by using the laminar flow fluid characteristics, the biofilm in the microbial membrane treatment subsystem can be prevented from being blocked.

[0066] The activated sludge treatment subsystem 300 includes a sludge double-return treatment component based on the AOA process, which has a better sewage treatment effect than the existing A2O process and can significantly improve the sewage treatment rate.

[0067] Wetland fillers include glass pumice, brick red soil, oyster shells, expanded clay and medical stone.

[0068] In the wetland filler, in order to effectively reduce the phosphorus and nitrogen in the sewage, brick red soil is specially selected in combination with glass pumice, oyster shells, expanded clay and medical stone for efficient adsorption. At the same time, in the wetland filler of the present application, a three-dimensional layered filler is used for layered filtration, which can effectively improve the filtration efficiency in sewage treatment, and can also enable bacteria to be deposited at a specific level, thereby further improving the sewage treatment efficiency.

[0069] The microbial membrane assembly includes a membrane aeration biofilm reactor (in some other specific implementations, a biological contact oxidation tank or an aerated biological filter tank may also be selected), and the aerated biofilm reactor is supplied with air through an air pump 305 .

[0070] The microbial membrane component in the present application uses a composite circulation laminar flow regulating component to flush the sewage to the aerated biofilm reactor in the form of laminar flow, thereby improving efficiency.

[0071] The sludge double recirculation treatment component includes a continuous flow sludge double recirculation anaerobic / aerobic / anoxic sewage treatment facility.

[0072] The information sensing components include water quality parameter sensors, flow sensors, temperature sensors and pressure sensors.

[0073] Water quality parameter sensors are used to collect sewage data indicators commonly used in the sewage treatment process, including nitrogen content, phosphorus content, pH, chemical oxygen demand, biochemical oxygen demand and redox potential. These data play a key role in the subsequent calculation of nitrogen content, phosphorus content and other indicators. Through these sensors, the sewage treatment status can be effectively detected, so that the sewage treated by the entire sewage treatment system can meet the relevant national standards.

[0074] On the other hand, the present application also provides a sewage treatment method obtained by the above-mentioned sewage treatment system based on the AOA process, comprising:

[0075] The activated sludge treatment subsystem is provided with an anaerobic tank 301, an aerobic tank 302 and an anoxic tank 303;

[0076] S101, the primary sewage to be treated flows into the circulation regulating subsystem 400, the circulation regulating subsystem 400 reads the parameters of the sewage through the information sensing component, and transports the primary sewage to the activated sludge treatment subsystem 300;

[0077] S102, the circulation regulating subsystem 400 inputs the primary sewage into the anaerobic tank 301, and treats it in the anaerobic tank 301 to obtain secondary sewage;

[0078] S103, the circulation regulating subsystem 400 inputs the secondary sewage into the aerobic tank;

[0079] S104, the circulation regulating subsystem 400 inputs the secondary sewage in the aerobic pool into the microbial film treatment subsystem 200, and the biofilm treatment subsystem 200 treats the secondary sewage to obtain the primary sewage of the first branch;

[0080] In the microbial membrane treatment subsystem 200, the composite circulation laminar flow regulating component flushes the secondary sewage to the surface of the microbial membrane component in the form of laminar flow. The laminar flow can improve the operating efficiency of the microbial membrane component and avoid the accumulation of pollutants.

[0081] S105, the circulation regulating subsystem 400 inputs the primary sewage of the first branch into the composite plant ecological subsystem 100, and after being processed by the composite plant ecological subsystem, the secondary sewage of the first branch is obtained;

[0082] The nitrogen content of the first branch primary sewage treated by the microbial membrane treatment subsystem 200 can be further reduced under the treatment of the composite plant ecological subsystem 100, and can also provide support for the growth of emergent plants in the composite plant ecological subsystem 100.

[0083] S106, the circulation regulating subsystem 400 transports the secondary sewage from the first branch back to the aerobic tank 302 to mix with the secondary sewage;

[0084] S107, the secondary sewage is treated in the aerobic tank 302 to obtain tertiary sewage;

[0085] Comparative treatment of nitrogen content ratios of primary and tertiary effluents;

[0086] When the ratio of the nitrogen content in the primary sewage to the nitrogen content in the tertiary sewage is 2.5, the tertiary sewage is input into the anoxic tank 303 for treatment, and is subsequently further purified to obtain reclaimed water.

[0087] After the sewage treatment system has carried out at least one complete sewage treatment, when the nitrogen content in the input primary sewage exceeds that of the tertiary sewage treated in the aerobic tank by 2.8 times, the secondary sewage entering the aerobic tank will be transported to the microbial membrane treatment subsystem 200 at a flow ratio of 1:1 using the circulation regulation subsystem 400, so as to quickly process and reduce the nitrogen content.

[0088] After executing step S108, it also includes: when the ratio of the nitrogen content in the primary sewage to the nitrogen content in the tertiary sewage is 1.5, the circulation regulation subsystem 400 inputs the secondary sewage in the aerobic tank into the composite plant ecological subsystem 100 to obtain ecologically treated water C1, and then inputs the ecologically treated water C1 into the biofilm treatment subsystem 200 to obtain membrane treated water C2, which is the reclaimed water.

[0089] When the input sewage is in better condition, you can choose to directly treat the sewage through the composite plant ecological subsystem for preliminary treatment, and then quickly treat it through the biofilm treatment subsystem to obtain the required reclaimed water; this situation can be used to quickly treat a large amount of low-pollution sewage, thereby avoiding overloading of the sewage station.

[0090] After executing step S108, it also includes: when the ratio of the nitrogen content in the primary sewage to the nitrogen content in the tertiary sewage is lower than 1.1, the circulation regulation subsystem 400 inputs the secondary sewage in the aerobic pool into the composite plant ecological subsystem 100, and the secondary sewage becomes reclaimed water after being processed by the composite plant ecological subsystem.

[0091] In the case of large amounts of lower-concentration primary sewage input, it can be directly treated through the composite plant ecological subsystem. The wetland fillers of the composite plant ecological subsystem can effectively adsorb low-concentration pollutants, which can not only save the service life of the microbial membrane components, but also avoid system paralysis when a huge amount of low-concentration sewage pours in.

[0092] After executing step S108, it also includes: when the ratio of the phosphorus content in the primary sewage to the phosphorus content in the tertiary sewage is greater than 3.5, steps S104-S106 are cycled multiple times until the ratio of the phosphorus content in the secondary sewage to the tertiary sewage is less than 2.

[0093] When the phosphorus content is relatively high, it means that the phosphorus content in the subsequent primary sewage is too high, which will cause the subsequent sewage treatment steps to take too long. At this time, it is necessary to use microbial membrane components to quickly remove phosphorus to avoid sewage accumulation in the sewage treatment system.

[0094] After step S104, it also includes: comparing the nitrogen content of the primary sewage and the secondary sewage concentration of the first branch; when the ratio of the nitrogen content of the primary sewage of the first branch to the secondary sewage concentration is greater than 0.9, canceling steps S104-S106; the microbial membrane treatment subsystem 200 stops working, and notifies the administrator to carry out maintenance through the overall control component.

[0095] When the nitrogen content of the primary sewage in the first branch is close to that of the secondary sewage, it means that the service life of the microbial membrane treatment subsystem is close to exhaustion, and maintenance should be carried out as soon as possible.

[0096] The sedimentation tank 304 is an auxiliary facility of the activated sludge treatment subsystem 300 and is used to precipitate the tertiary sewage when necessary.

[0097] Although the description of the present application has been quite detailed and specifically describes several described embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, but should be regarded as providing a broad possible interpretation of these claims by reference to the attached claims in view of the prior art, thereby effectively covering the intended scope of the present application. In addition, the above description of the present application is based on the foreseeable embodiments of the applicant, the purpose of which is to provide a useful description, and those non-substantial changes to the present application that have not yet been foreseen may still represent equivalent changes to the present application.

Claims

1. A sewage treatment method based on AOA process, characterized in that: A sewage treatment system based on the AOA process is used, wherein the sewage treatment system based on the AOA process comprises a composite plant ecological subsystem (100), a microbial membrane treatment subsystem (200), an activated sludge treatment subsystem (300) and a circulation regulation subsystem (400); The composite plant ecological subsystem (100) includes emergent plants and wetland fillers; The microbial membrane treatment subsystem (200) comprises a microbial membrane component and a composite circulation laminar flow regulating component; The activated sludge treatment subsystem (300) includes a sludge double return flow treatment component; In the composite plant ecological subsystem (100), the emergent plants are located above the wetland filler, the wetland filler has a layered structure, and a pipeline structure for liquid flow is provided in the wetland filler, and is connected to the circulation regulation subsystem (400); In the microbial membrane treatment subsystem (200), the composite circulation laminar flow regulating component is used to transport water to the microbial membrane module in a laminar flow form, and the composite circulation laminar flow regulating component is connected to the circulation regulating subsystem (400) through a pipeline; The sludge double-return treatment component is connected to the circulation regulation subsystem (400) via a pipeline; The circulation regulating subsystem (400) controls the liquid flow path between the composite plant ecological subsystem (100), the microbial membrane treatment subsystem (200) and the activated sludge treatment subsystem (300); The sewage treatment system based on the AOA process also includes an information sensing component for collecting water body data; The information sensing component is used to measure parameters of the composite plant ecological subsystem (100), the microbial membrane treatment subsystem (200), the activated sludge treatment subsystem (300) and the circulation regulation subsystem (400); The sludge double-return treatment component includes a continuous-flow sludge double-return anaerobic / aerobic / anoxic sewage treatment facility; The sewage treatment method based on the AOA process comprises: The activated sludge treatment subsystem is provided with an anaerobic tank (301), an aerobic tank (302) and an anoxic tank (303); S101, the primary sewage to be treated flows into the circulation regulating subsystem (400), the circulation regulating subsystem (400) reads the parameters of the sewage through the information sensing component, and transports the primary sewage to the activated sludge treatment subsystem (300); S102, the circulation regulating subsystem (400) inputs the primary sewage into the anaerobic tank (301), and treats the primary sewage in the anaerobic tank (301) to obtain secondary sewage; S103, the circulation regulating subsystem (400) inputs the secondary sewage into the aerobic tank; S104, the circulation regulating subsystem (400) inputs a portion of the secondary sewage entering the aerobic tank into the biofilm treatment subsystem (200), and the biofilm treatment subsystem (200) treats the secondary sewage to obtain first branch primary sewage; S105, the circulation regulating subsystem (400) inputs the first branch primary sewage into the composite plant ecological subsystem (100), and after being processed by the composite plant ecological subsystem, obtains the first branch secondary sewage; S106, the circulation regulating subsystem (400) transports the secondary sewage of the first branch back to the aerobic pool (302) to mix with the secondary sewage entering the aerobic pool; S107, the secondary sewage is treated in the aerobic tank (302) to obtain tertiary sewage; S108, comparing the nitrogen content ratio of the primary sewage and the tertiary sewage; S109. When the ratio of the nitrogen content in the primary sewage to the nitrogen content in the tertiary sewage is 1.8-2.8, the tertiary sewage is input into the anoxic tank (303) for treatment, and is subsequently further purified to obtain reclaimed water.

2. A sewage treatment method based on AOA process according to claim 1, characterized in that: The wetland filler includes brick red soil and at least one of glass pumice, oyster shell, ceramsite and medical stone.

3. A sewage treatment method based on AOA process according to claim 1, characterized in that: The microbial membrane assembly comprises at least one of a membrane aeration biofilm reactor, a biological contact oxidation tank and an aerated biological filter.

4. A sewage treatment method based on AOA process according to claim 1, characterized in that: The information sensing component includes a water quality parameter sensor, a flow sensor, a temperature sensor and a pressure sensor.

5. A sewage treatment method based on AOA process according to claim 1, characterized in that: After executing step S108, the method further includes: When the ratio of the nitrogen content in the primary sewage to the nitrogen content in the tertiary sewage is 1.1-1.8, the circulation regulation subsystem (400) inputs the secondary sewage entering the aerobic pool into the composite plant ecological subsystem (100) to obtain ecologically treated water C1, and then inputs the ecologically treated water C1 into the biofilm treatment subsystem (200) to obtain membrane treated water C2, which is reclaimed water.

6. A sewage treatment method based on AOA process according to claim 1, characterized in that: After executing step S108, the method further includes: When the ratio of the nitrogen content in the primary sewage to the nitrogen content in the tertiary sewage is lower than 1.1, the circulation regulating subsystem (400) inputs the secondary sewage entering the aerobic pool into the composite plant ecological subsystem (100), and the secondary sewage becomes reclaimed water after being treated by the composite plant ecological subsystem.

7. A sewage treatment method based on AOA process according to claim 1, characterized in that: After executing step S108, the method further includes: When the ratio of the phosphorus content in the primary sewage to the phosphorus content in the tertiary sewage is greater than 3.5, steps S104-S106 are cycled multiple times until the ratio of the phosphorus content in the secondary sewage to the tertiary sewage is less than 2.

8. A sewage treatment method based on AOA process according to claim 1, characterized in that: After step S104, the method further includes: comparing the nitrogen content of the first branch primary sewage and the secondary sewage; When the ratio of the nitrogen content of the first branch primary sewage to the nitrogen content of the secondary sewage is greater than 0.9, steps S104-S106 are canceled; and the microbial membrane treatment subsystem (200) stops working.

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