Domestic sewage treatment system based on AO / A2O process and artificial wetland

Abstract

The present invention relates to the technical field of sewage treatment, and discloses a domestic sewage treatment system based on AO / A2O process and artificial wetland, comprising: an anaerobic treatment module, an aeration treatment module, an artificial wetland treatment module and a disinfection metering module arranged in sequence; and also comprising a monitoring module for detecting the influent water quality and the effluent water quality of the artificial wetland treatment module, and a control module for controlling the operation of the aeration treatment module and the artificial wetland treatment module. The advantages of the anaerobic treatment module, the aeration treatment module and the artificial wetland treatment module for sewage treatment can be fully utilized, the overall footprint is small, the system investment is small, and the operating energy consumption can be reduced, and the effluent water quality can be improved to enhance the sewage treatment effect; the operation of the artificial wetland treatment module and the aeration treatment module can be adjusted and controlled through the monitoring module and the control module, and the sewage treatment effect can be further enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and more specifically, to a domestic sewage treatment system based on AO / A2O process and artificial wetland. Background Art

[0002] The AO process is called the anaerobic-aerobic process. A (Anaerobic) is the anaerobic section, which is used for nitrogen and phosphorus removal. O (Oxic) is the aerobic section, which is used to remove organic matter in the water. The A2O process, also known as the AAO process, is called the anaerobic-anoxic-aerobic process. It is a commonly used sewage treatment process that can be used for secondary sewage treatment, tertiary sewage treatment and reclaimed water reuse, and has good nitrogen and phosphorus removal effects. The AO and A2O processes are biochemical treatment technologies, and their disadvantages are large system investment and high operating energy consumption. Artificial wetlands belong to ecological treatment technologies, which can be divided into three categories according to the water flow type: surface flow, subsurface flow and vertical flow. The biggest drawback of this technology is the insufficient oxygen supply in the system, so a large area of ​​artificial wetlands is required.

[0003] Therefore, it is necessary to propose a domestic sewage treatment system based on AO / A2O process and artificial wetland to solve the problems of high investment cost, high operating energy consumption and large footprint in the existing technology. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In order to at least partially solve the above problems, the present invention provides a domestic sewage treatment system based on AO / A2O process and artificial wetland, comprising: an anaerobic treatment module, an aeration treatment module, an artificial wetland treatment module and a disinfection metering module arranged in sequence; it also includes a monitoring module for detecting the water quality of the inlet and outlet of the artificial wetland treatment module, and a control module for controlling the operation of the aeration treatment module and the artificial wetland treatment module.

[0006] Preferably, the anaerobic treatment module comprises: a grid water collection tank, a regulating tank and an anaerobic tank which are arranged in sequence, and the water discharged from the anaerobic tank enters the aeration treatment module for treatment.

[0007] Preferably, the artificial wetland treatment module comprises: a plurality of artificial wetland treatment units, each artificial wetland treatment unit can independently control the water inflow, and the aeration treatment module is respectively connected to the plurality of artificial wetland treatment units.

[0008] Preferably, the aeration treatment module comprises: a plurality of upflow aerated biological filters.

[0009] Preferably, when the amount of water to be treated in the anaerobic tank is lower than the first set value and greater than the third set value, the aeration treatment module and the artificial wetland treatment module are controlled to work using the first control strategy of the control module;

[0010] The first control strategy includes: the artificial wetland treatment module operates under its target hydraulic load, and multiple artificial wetland treatment units stop treating sewage in turn in sequence; the aeration treatment module works at a treated water volume corresponding to the target hydraulic load.

[0011] Preferably, when the amount of water to be treated in the anaerobic tank is greater than or equal to the first set value and lower than the second set value, the second control strategy of the control module is used to control the operation of the aeration treatment module and the artificial wetland treatment module;

[0012] The second control strategy includes: the artificial wetland treatment module operates at its maximum hydraulic load, and multiple artificial wetland treatment units work simultaneously; the aeration treatment module works at a treatment water volume corresponding to the maximum hydraulic load;

[0013] The second setting value is greater than the first setting value.

[0014] Preferably, when the amount of water to be treated in the anaerobic tank is lower than the third set value, the third control strategy of the control module is used to control the artificial wetland treatment module to operate;

[0015] The third control strategy includes: the artificial wetland treatment module operates at its minimum hydraulic load, and the multiple artificial wetland treatment units stop treating sewage in turn in sequence; the aeration treatment module works at the treatment water volume corresponding to the minimum hydraulic load;

[0016] The first setting value is greater than the third setting value.

[0017] Preferably, when a plurality of artificial wetland treatment units suspend sewage treatment in turn in sequence, at least one artificial wetland treatment unit suspends sewage treatment each time, and the suspension time of sewage treatment meets the set time.

[0018] Preferably, the maximum hydraulic load of each artificial wetland treatment unit is: the ratio of the maximum treated water volume per unit time to the area of ​​the artificial wetland treatment unit under the condition of meeting the target effluent water quality; then the maximum hydraulic load of the artificial wetland treatment module is the sum of the maximum hydraulic loads of multiple artificial wetland treatment units, and the target hydraulic load of the artificial wetland treatment module is less than its maximum hydraulic load.

[0019] Preferably, the monitoring module comprises:

[0020] The first monitoring unit is used to monitor the influent water quality of each artificial wetland treatment unit;

[0021] The second monitoring unit is used to monitor the effluent quality of each artificial wetland treatment unit;

[0022] The judgment unit judges whether the maximum hydraulic load is attenuated according to the inlet water quality and outlet water quality of each artificial wetland treatment unit. If the maximum hydraulic load of all artificial wetland treatment units is not attenuated, the artificial wetland treatment module can operate normally; if the maximum hydraulic load of at least one artificial wetland treatment unit is attenuated, it is judged whether multiple artificial wetland treatment units can operate at the target hydraulic load under the first control strategy. If so, the artificial wetland treatment module can operate normally. If not, the artificial wetland treatment unit with the highest degree of maximum hydraulic load attenuation is maintained first.

[0023] Compared with the prior art, the present invention has at least the following beneficial effects:

[0024] The domestic sewage treatment system based on AO / A2O process and artificial wetland described in the present invention can make full use of the advantages of anaerobic treatment module, aeration treatment module and artificial wetland treatment module in sewage treatment, with a small overall footprint and small system investment, and can reduce operating energy consumption and improve effluent water quality to enhance the sewage treatment effect; the monitoring module and the control module can regulate and control the operation of the artificial wetland treatment module and the aeration treatment module to further enhance the sewage treatment effect.

[0025] The domestic sewage treatment system based on AO / A2O process and artificial wetland described in the present invention, other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by technicians in this field through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 It is a structural schematic diagram of the domestic sewage treatment system based on AO / A2O process and artificial wetland according to the present invention;

[0028] Figure 2 It is a schematic plan view of the domestic sewage treatment system based on AO / A2O process and artificial wetland according to the present invention;

[0029] Figure 3This is a system block diagram of the domestic sewage treatment system based on AO / A2O process and artificial wetland described in the present invention. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0031] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0032] like Figure 1-Figure 3 As shown, the present invention provides a domestic sewage treatment system based on AO / A2O process and artificial wetland, comprising: an anaerobic treatment module 1, an aeration treatment module 2, an artificial wetland treatment module 3 and a disinfection metering module 4 arranged in sequence; it also includes a monitoring module for detecting the influent water quality and the effluent water quality of the artificial wetland treatment module 3, and a control module for controlling the operation of the aeration treatment module 2 and the artificial wetland treatment module 3.

[0033] Among them, the anaerobic treatment module 1 and the aeration treatment module 2 are the anaerobic section and aerobic section in the sewage treatment process, namely, the AO process; an anoxic treatment module (anoxic section) is added between the anaerobic treatment module 1 and the aeration treatment module 2, forming an anaerobic-anoxic-aerobic A2O process; when conducting sewage treatment, a suitable process is selected based on the analysis of local domestic sewage.

[0034] The artificial wetland treatment module 3 is to plant suitable plants on the filler, and discharge the sewage treated by the aeration treatment module 2 into an artificially constructed wetland similar to a swamp. When the eutrophic water flows through the artificial wetland, it is filtered through sand and soil, and the various microbial activities in the plant rhizosphere purify the water quality. The insoluble organic matter in the sewage can be quickly intercepted by the sedimentation and filtration of the wetland, and then used by microorganisms. The soluble organic matter in the sewage can be decomposed and removed through the adsorption, absorption and biological metabolic degradation process of the plant root biofilm.

[0035] The disinfection metering module 4 is used to disinfect the sewage and monitor and count the online flow in real time, and then discharge it in compliance with the standards; the disinfection method can be chlorine disinfection (such as chlorine, chlorine dioxide, sodium hypochlorite), oxidant disinfection (ozone, peracetic acid), and radiation disinfection (such as ultraviolet rays); ultraviolet disinfection is preferred in the present invention, which has the advantages of high efficiency, safety, environmental protection and economy, can effectively kill pathogenic viruses, bacteria and protozoa, and hardly produces any disinfection by-products.

[0036] The monitoring module can monitor the inlet and outlet water quality of the artificial wetland treatment module 3 in real time and analyze the water quality. The control module can adjust and control the artificial wetland treatment module 3 and the aeration treatment module 2 according to the analysis results of the water quality to improve the sewage treatment effect.

[0037] Through the above design, the domestic sewage treatment system based on AO / A2O process and artificial wetland can make full use of the advantages of anaerobic treatment module 1, aeration treatment module 2 and artificial wetland treatment module 3 in sewage treatment. The overall footprint is small, the system investment is small, and the operating energy consumption can be reduced. The effluent water quality can be improved to improve the sewage treatment effect; the monitoring module and the control module can adjust and control the operation of the artificial wetland treatment module 3 and the aeration treatment module 2 to further improve the sewage treatment effect.

[0038] like Figure 1 As shown, in one embodiment, the anaerobic treatment module 1 includes: a grid water collection tank 11, a regulating tank 12 and an anaerobic tank 13 arranged in sequence, and the water discharged from the anaerobic tank 13 enters the aeration treatment module 2 for treatment.

[0039] The sewage passes through the screen of the screen water collection tank 11 and then enters the regulating tank 12; the volume of the regulating tank 12 needs to ensure sufficient water regulation capacity to meet the sewage treatment requirements. The regulating tank 12 can homogenize the water quality. The water quality of various domestic sewage is different, and the concentration of domestic sewage discharged at different times is also different. The regulating tank 12 can mix various domestic sewage and sewage discharged at different times to achieve uniform water quality, which is beneficial to sewage treatment; in addition, the regulating tank 12 also plays a sedimentation role. The sewage contains a large amount of inorganic particles, organic particles and suspended matter with a specific gravity slightly greater than that of water. Part of this type of material will settle in the regulating tank 12 to form sludge. This sludge can be regularly sucked away and transported out by a sludge suction truck. The amount of this part of the sludge is very small, and it is generally cleaned once every six months; after the sewage passes through the regulating tank 12, it enters the anaerobic tank 13. The anaerobic tank 13 has good phosphorus and nitrogen removal functions, so that the final effluent water quality is good.

[0040] like Figure 2 As shown, in one embodiment, the artificial wetland treatment module 3 includes: a plurality of artificial wetland treatment units 31, each artificial wetland treatment unit 31 can independently control the water intake, and the aeration treatment module 2 is respectively connected to the plurality of artificial wetland treatment units 31.

[0041] Part of the sewage after the aeration treatment module 2 flows back to the regulating tank 12 for re-treatment, and the other part enters the artificial wetland treatment module 3. The artificial wetland treatment module 3 includes a plurality of artificial wetland treatment units 31. The sewage discharged from the aeration treatment module 2 can be intelligently distributed to the plurality of artificial wetland treatment units 31 for treatment.

[0042] The control module can independently control the water inflow and whether water is inflow into the artificial wetland treatment unit 31, so as to realize intelligent distribution and control of the treated water volume and improve the sewage treatment effect;

[0043] The sewage treated by the aeration treatment module 2 is controlled by the control module and enters the artificial wetland treatment unit 31 (which can be soil with swamp aquatic plants such as reeds and cattails). During the flow of the sewage in a certain direction, it is purified under the comprehensive physical, chemical and biological effects in the complex ecosystem of aquatic plants, soil and microorganisms. The purified sewage then enters the disinfection metering module 4 for disinfection and real-time monitoring of the online flow.

[0044] In one embodiment, the aeration treatment module 2 includes: a plurality of upflow aerated biological filters.

[0045] The upflow aerated biological filter is filled with fillers, on which a large number of aerobic microorganisms grow to form a microbial film. Under the action of aerobic microorganisms, organic matter, animal and plant oils, ammonia nitrogen, phosphorus, etc. in the sewage are decomposed and utilized by the microorganisms as nutrients, and the microorganisms' own substances are synthesized or decomposed into carbon dioxide, water, nitrogen, thereby removing organic matter, ammonia nitrogen, phosphorus, etc. in the sewage and purifying the effluent. The microbial film on the filler in the upflow aerated biological filter is constantly aging and falling off, and new microbial film is constantly growing; the oxygen required for the metabolism of aerobic microorganisms is provided by the fan.

[0046] In one embodiment, the control module's control over the artificial wetland treatment module 3 needs to meet the following conditions: ensuring the sewage treatment capacity of the artificial wetland treatment module 3, ie, the effluent quality, without affecting the sewage treatment efficiency.

[0047] Since the amount of domestic sewage discharged at different times is different, the water amount in the regulating tank 12 fluctuates, and the amount of water to be treated in the anaerobic tank 13 will also fluctuate. Therefore, under the condition of ensuring the sewage treatment efficiency, the control module controls the aeration treatment module 2 and the artificial wetland treatment module 3 according to the amount of water to be treated in the anaerobic tank 13 to ensure the sewage treatment capacity of the artificial wetland treatment module 3 and prevent its capacity from being attenuated, thereby ensuring the effluent water quality of the artificial wetland treatment module 3 and improving the sewage treatment effect.

[0048] Specifically, when the amount of water to be treated in the anaerobic tank 13 is lower than the first set value and greater than the third set value, the aeration treatment module 2 and the artificial wetland treatment module 3 are controlled to work by using the first control strategy of the control module;

[0049] The first control strategy includes: the artificial wetland treatment module 3 operates at its target hydraulic load, and multiple artificial wetland treatment units 31 stop treating sewage in turn in sequence; the aeration treatment module 2 works at a treated water volume corresponding to the target hydraulic load.

[0050] When the amount of water to be treated in the anaerobic tank 13 is lower than the first set value and greater than the third set value, it indicates that the water amount in the anaerobic tank 13 fluctuates slightly. In order to reduce the attenuation degree of the artificial wetland treatment unit 31, the control module can control multiple artificial wetland treatment units 31 to suspend sewage treatment in sequence, and the control module controls the artificial wetland treatment module 3 to operate under the target hydraulic load. Correspondingly, the aeration treatment module 2 works under the treated water volume corresponding to the target hydraulic load to ensure the sewage treatment efficiency.

[0051] Furthermore, when the amount of water to be treated in the anaerobic tank 13 is greater than or equal to the first set value and lower than the second set value, the aeration treatment module 2 and the artificial wetland treatment module 3 are controlled to work by using the second control strategy of the control module;

[0052] The second control strategy includes: the artificial wetland treatment module 3 operates at its maximum hydraulic load, and multiple artificial wetland treatment units 31 work simultaneously; the aeration treatment module 2 works at a treatment water volume corresponding to the maximum hydraulic load;

[0053] The second setting value is greater than the first setting value.

[0054] When the amount of water to be treated in the anaerobic tank 13 exceeds the first set value but does not exceed the second set value, it indicates that the water in the anaerobic tank 13 has a large fluctuation, that is, the discharge amount of domestic sewage has a large increase. When the amount of water to be treated does not exceed the second set value, the second control strategy is promptly adopted to control the operation of the artificial wetland treatment module 3. At this time, priority is given to sewage treatment efficiency, that is, multiple artificial wetland treatment units 31 work at the same time, so that the artificial wetland treatment module 3 operates under its maximum hydraulic load. Correspondingly, the aeration treatment module 2 works at the treated water volume corresponding to the maximum hydraulic load.

[0055] Further, when the amount of water to be treated in the anaerobic tank 13 is lower than the third set value, the third control strategy of the control module is used to control the artificial wetland treatment module 3 to work;

[0056] The third control strategy includes: the artificial wetland treatment module 3 operates at its minimum hydraulic load, and the multiple artificial wetland treatment units 31 stop treating sewage in turn in sequence; the aeration treatment module 2 works at the treatment water volume corresponding to the minimum hydraulic load;

[0057] The first setting value is greater than the third setting value.

[0058] When the amount of water to be treated in the anaerobic tank 13 is lower than the third set value, it indicates that the water in the anaerobic tank 13 has a large fluctuation, that is, the discharge of domestic sewage has decreased significantly. At this time, the hydraulic load of the artificial wetland treatment module 3 can be reduced, that is, it can operate under the minimum hydraulic load, and the aeration treatment module 2 works at the treated water volume corresponding to the minimum hydraulic load. At this time, the multiple artificial wetland treatment units 31 can also suspend the treatment of sewage in sequence, providing more reaction and sedimentation time for the sewage in the artificial wetland treatment unit 31.

[0059] Furthermore, when the plurality of artificial wetland treatment units 31 suspend the treatment of sewage in turn in sequence, at least one artificial wetland treatment unit 31 suspends the treatment of sewage each time, and the suspension time of the treatment of sewage satisfies the set time.

[0060] Under the first control strategy and the third control strategy, at least one artificial wetland treatment unit 31 can suspend sewage treatment. In this way, each artificial wetland treatment unit 31 can achieve intermittent water inflow during the sewage treatment process, and the time for suspending sewage treatment each time can meet the set time, so as to improve the maintenance effect of each artificial wetland treatment unit 31.

[0061] Through the above-mentioned control of the artificial wetland treatment module 3, it is possible to cope with large fluctuations in the discharge of domestic sewage, and, under the premise of ensuring the sewage treatment efficiency, each artificial wetland treatment unit 31 will not be overloaded, so as to reduce the attenuation of the treatment capacity of the artificial wetland treatment unit 31, thereby ensuring the water quality of the effluent.

[0062] In one embodiment, the maximum hydraulic load of each artificial wetland treatment unit 31 is: the ratio of the maximum treated water volume per unit time to the area of ​​the artificial wetland treatment unit 31 under the condition of meeting the target effluent water quality; then the maximum hydraulic load of the artificial wetland treatment module 3 is the sum of the maximum hydraulic loads of multiple artificial wetland treatment units 31, and the target hydraulic load of the artificial wetland treatment module 3 is less than its maximum hydraulic load.

[0063] The hydraulic load of the artificial wetland treatment unit 31 is related to the amount of water it treats per unit time and its area. Under the condition of ensuring the quality of the effluent water, if the artificial wetland treatment unit 31 is not properly maintained, its maximum hydraulic load may decay. Therefore, the maximum hydraulic load of each artificial wetland treatment unit 31 may change at any time. Therefore, the control module can control the water intake of the corresponding artificial wetland treatment unit 31 according to the maximum hydraulic load of each artificial wetland treatment unit 31, so as to realize the reasonable allocation and control of the total treated water volume.

[0064] In one embodiment, the monitoring module includes:

[0065] A first monitoring unit, used to monitor the influent water quality of each artificial wetland treatment unit 31;

[0066] A second monitoring unit is used to monitor the effluent quality of each artificial wetland treatment unit 31;

[0067] Among them, the concentration of the main pollutants that can be treated by the artificial wetland treatment unit 31 can be used as a criterion for judging the quality of the influent and effluent water;

[0068] A judging unit, judging whether the maximum hydraulic load is attenuated according to the inlet water quality and outlet water quality of each artificial wetland treatment unit 31;

[0069] According to the influent water quality and effluent water quality of each artificial wetland treatment unit 31, it is judged whether the maximum hydraulic load is attenuated, including: obtaining the average influent water quality of each artificial wetland treatment unit 31 within a monitoring period (the average concentration of the main pollutants within the monitoring period); ) and average effluent quality (concentrations of major pollutants during the monitoring period) ), and then calculate the treatment capacity of each artificial wetland treatment unit 31 ,Right now , pre-set reference values ​​for judging processing capacity ,like , it indicates that the maximum hydraulic load of the corresponding artificial wetland treatment unit 31 is attenuated. , it indicates that the maximum hydraulic load of the corresponding artificial wetland treatment unit 31 has not decayed;

[0070] If the maximum hydraulic load of all artificial wetland treatment units 31 does not decay, the artificial wetland treatment module 3 can operate normally;

[0071] If the maximum hydraulic load of at least one artificial wetland treatment unit 31 decays, it is determined whether the multiple artificial wetland treatment units 31 can operate at the target hydraulic load under the first control strategy. If so, the artificial wetland treatment module 3 can operate normally. If not, the artificial wetland treatment unit 31 with the highest degree of maximum hydraulic load decay is maintained first.

[0072] If the maximum hydraulic load of at least one artificial wetland treatment unit 31 decays, it indicates that the treatment capacity of the artificial wetland treatment module 3 decreases, and the upper limit of the treated water volume of the artificial wetland treatment unit 31 that decays should be adaptively adjusted, that is, the upper limit of the water inlet volume, to prevent the effluent water quality from failing to meet the target effluent water quality and ensure the sewage treatment effect;

[0073] Furthermore, since in the first control strategy, multiple artificial wetland treatment units 31 need to suspend sewage treatment in turn in sequence, in order to ensure the sewage treatment efficiency, it is necessary to ensure that the target hydraulic load of the working artificial wetland treatment unit 31 remains unchanged (the hydraulic load of each artificial wetland treatment unit 31 is distributed and controlled by the control module); therefore, it is necessary to continue to determine whether the multiple artificial wetland treatment units 31 after attenuation can work at the target hydraulic load under the first control strategy. If so, the artificial wetland treatment module 3 can operate normally, and can meet the sewage treatment efficiency when the discharge volume of domestic sewage increases significantly. There is no need to maintain the artificial wetland treatment module 3 temporarily. If not, it indicates that the attenuation degree of the artificial wetland treatment module 3 will affect the sewage treatment effect and efficiency, and the artificial wetland treatment unit 31 with the highest maximum hydraulic load attenuation degree shall be maintained first, and the maintenance can be carried out in a manner that does not affect the normal operation of the artificial wetland treatment unit 31.

[0074] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A domestic sewage treatment system based on artificial wetlands, characterized in that: include: An anaerobic treatment module (1), an aeration treatment module (2), an artificial wetland treatment module (3) and a disinfection metering module (4) are arranged in sequence; further comprising a monitoring module for detecting the water quality of the influent and the effluent of the artificial wetland treatment module (3), and a control module for controlling the operation of the aeration treatment module (2) and the artificial wetland treatment module (3); The anaerobic treatment module (1) comprises: a grid water collection tank (11), a regulating tank (12) and an anaerobic tank (13) which are arranged in sequence, and water discharged from the anaerobic tank (13) enters the aeration treatment module (2) for treatment; The artificial wetland treatment module (3) comprises: a plurality of artificial wetland treatment units (31), each artificial wetland treatment unit (31) being capable of controlling the water intake independently, and the aeration treatment module (2) being connected to the plurality of artificial wetland treatment units (31) respectively; When the amount of water to be treated in the anaerobic tank (13) is lower than a first set value and greater than a third set value, the aeration treatment module (2) and the artificial wetland treatment module (3) are controlled to operate using a first control strategy of the control module; The first control strategy includes: the artificial wetland treatment module (3) operates at its target hydraulic load, and the plurality of artificial wetland treatment units (31) suspend sewage treatment in turn in sequence; the aeration treatment module (2) operates at a treatment water volume corresponding to the target hydraulic load; The monitoring module comprises: A first monitoring unit, used to monitor the water quality of the influent of each artificial wetland treatment unit (31); A second monitoring unit, used to monitor the effluent quality of each artificial wetland treatment unit (31); A judgment unit, based on the inlet water quality and outlet water quality of each artificial wetland treatment unit (31), judges whether the maximum hydraulic load has been attenuated; if the maximum hydraulic load of all artificial wetland treatment units (31) has not been attenuated, the artificial wetland treatment module (3) can operate normally; if the maximum hydraulic load of at least one artificial wetland treatment unit (31) has been attenuated, judges whether the multiple artificial wetland treatment units (31) can operate at the target hydraulic load under the first control strategy; if so, the artificial wetland treatment module (3) can operate normally; if not, prioritizes maintenance of the artificial wetland treatment unit (31) with the highest degree of maximum hydraulic load attenuation; Wherein, judging whether the maximum hydraulic load is attenuated based on the inlet water quality and outlet water quality of each artificial wetland treatment unit (31) includes: obtaining the average inlet water quality and the average outlet water quality of each artificial wetland treatment unit (31) within a monitoring time period, and then calculating the treatment capacity of each artificial wetland treatment unit (31) ,Right now , pre-set reference values ​​for judging processing capacity ,like , it indicates that the maximum hydraulic load of the corresponding artificial wetland treatment unit (31) has decayed. , it indicates that the maximum hydraulic load of the corresponding constructed wetland treatment unit (31) has not decayed; The average inlet water quality is: the average concentration of the main pollutants at the inlet during the monitoring period The average effluent quality is: the concentration of the main pollutants at the effluent during the monitoring period .

2. The domestic sewage treatment system based on artificial wetlands according to claim 1 is characterized in that: The aeration treatment module (2) comprises: a plurality of upflow aerated biological filters.

3. The domestic sewage treatment system based on artificial wetlands according to claim 1 is characterized in that: When the amount of water to be treated in the anaerobic tank (13) is greater than or equal to a first set value and less than a second set value, the aeration treatment module (2) and the artificial wetland treatment module (3) are controlled to operate using a second control strategy of the control module; The second control strategy comprises: the artificial wetland treatment module (3) operates at its maximum hydraulic load, and a plurality of artificial wetland treatment units (31) operate simultaneously; the aeration treatment module (2) operates at a treatment water volume corresponding to the maximum hydraulic load; The second setting value is greater than the first setting value.

4. The domestic sewage treatment system based on artificial wetlands according to claim 3 is characterized in that: When the amount of water to be treated in the anaerobic tank (13) is lower than a third set value, the artificial wetland treatment module (3) is controlled to operate using a third control strategy of the control module; The third control strategy includes: the artificial wetland treatment module (3) operates at its minimum hydraulic load, and the plurality of artificial wetland treatment units (31) suspend sewage treatment in turn in sequence; the aeration treatment module (2) operates at a treatment water volume corresponding to the minimum hydraulic load; The first setting value is greater than the third setting value.

5. The domestic sewage treatment system based on artificial wetlands according to claim 4 is characterized in that: When the plurality of artificial wetland treatment units (31) suspend sewage treatment in turn in sequence, at least one artificial wetland treatment unit (31) suspends sewage treatment each time, and the suspension time of sewage treatment satisfies the set time.

6. The domestic sewage treatment system based on artificial wetlands according to claim 5 is characterized in that: The maximum hydraulic load of each artificial wetland treatment unit (31) is: the ratio of the maximum treated water volume per unit time to the area of ​​the artificial wetland treatment unit (31) under the condition of meeting the target effluent water quality; then the maximum hydraulic load of the artificial wetland treatment module (3) is the sum of the maximum hydraulic loads of the multiple artificial wetland treatment units (31), and the target hydraulic load of the artificial wetland treatment module (3) is less than its maximum hydraulic load.

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