A kind of artificial wetland system for preventing clogging and strengthening anaerobic ammonia oxidation denitrification and its use method

Abstract

The invention discloses an artificial wetland system for preventing clogging and strengthening anaerobic ammonia oxidation denitrification and a method for using the system, which relates to the technical field of water environment management. It uses a pre-pond to precipitate suspended solids, uses a nano-gas flotation filter to remove suspended solids that are difficult to settle, uses a bionic aquatic plant wetland to remove suspended solids in the water body, and combines the addition of microorganisms to remove SS, COD, ammonia nitrogen, total phosphorus and total nitrogen in the water body, and then removes COD, ammonia nitrogen, total phosphorus and total nitrogen in the water body through a submerged flow wetland, and at the same time controls the water level of the submerged flow wetland to perform high water level-low water level-high water level periodic operation, expands the water-land interlaced area, strengthens the artificial wetland anaerobic ammonia oxidation denitrification, and finally the polluted water body is denitrified and dephosphorized again through the surface flow wetland, so as to achieve the purpose of gradually reducing the suspended solids in the influent of the whole system and strengthening the denitrification and dephosphorization effect of the artificial wetland. The invention significantly improves the effluent water quality, prevents the clogging of the artificial wetland, and prolongs the operation life of the artificial wetland, and has broad application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of water environment treatment, and in particular to an artificial wetland system for preventing clogging and strengthening anaerobic ammonia oxidation denitrification and a method for using the system. Background Art

[0002] With the rapid development of my country's economy, urban construction is accelerating, and the disorderly discharge of water has caused the destruction of urban water environment. In addition, the supporting sewage treatment facilities are not perfect, which has led to the further deterioration of my country's ecological water environment and the increasing pollution of water bodies. Among them, water environment problems such as eutrophication and black and smelly water bodies seriously affect the image of the city and the living standards of surrounding residents, restricting my country's construction of an ecological civilization society where people and nature coexist harmoniously. As an environmentally friendly technology, artificial wetlands have the advantages of low operating costs, simple maintenance, and load impact resistance. They are of great significance to my country's water environment governance and ecological civilization construction. However, due to some defects of artificial wetlands, such as artificial wetland clogging and poor denitrification effect, the promotion of artificial wetlands is restricted. Based on this, it is particularly necessary to design an artificial wetland system and its use method that prevents clogging and strengthens anaerobic ammonia oxidation denitrification. Summary of the invention

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an artificial wetland system and a method of using the system for preventing clogging and enhancing anaerobic ammonia oxidation denitrification, thereby extending the operation time of the artificial wetland, enhancing the denitrification effect of the artificial wetland, achieving good denitrification and phosphorus removal effects, reducing the operation load of the artificial wetland and the risk of clogging, contributing to the promotion and application of artificial wetland technology, accelerating the recovery of the water environment and the water ecosystem, and promoting the construction of an ecologically civilized society in which man and nature live in harmony in my country, and the system is easy to promote and use.

[0004] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical scheme: an artificial wetland system for preventing clogging and strengthening anaerobic ammonia oxidation denitrification, comprising a water inlet system, a pretreatment system and an artificial wetland system, the water inlet system, the pretreatment system and the artificial wetland system are connected in sequence; the water inlet system comprises a filter grid, a water inlet lift pump, a water inlet valve and a first flow meter, the pretreatment system comprises a pre-pond system and a nano-flotation filter tank system, the artificial wetland system consists of a microbial agent dosing system, a bionic aquatic plant wetland The system is composed of a horizontal subsurface artificial wetland system, a subsurface wetland PLC water level automatic control system, a vertical subsurface artificial wetland system, and a surface flow artificial wetland system. The filter grid is placed in the polluted water body, and the outlet of the water inlet lift pump is connected to the water inlet of the pre-pond system to pump the polluted water into the pre-treatment system. The water inlet valve and the first flow meter are installed on the pipeline connecting the water inlet lift pump and the pre-pond system. The water inlet flow rate is controlled by the water inlet valve and the first flow meter. The pre-pond system is connected to the nano-flotation filter system, and the first control is arranged in the middle. The pre-pond system is used to precipitate the settleable suspended solids in the water body. The nano-air flotation filter system is used to separate the difficult-to-settle suspended solids in the water body and aerate the polluted water body to increase the dissolved oxygen in the water body. The nano-air flotation filter system is connected to the bionic aquatic plant-plant wetland system, and a second control valve is set between the two. The bionic aquatic plant-plant wetland system is connected to the dosing port of the microbial agent dosing system. The microbial agent dosing system pumps the microbial agent into the bionic aquatic plant-plant wetland system. The outlet of the system is connected to the inlet of the horizontal subsurface flow artificial wetland system through a pipeline, and a third control valve is arranged on the pipeline. The outlet of the horizontal subsurface flow artificial wetland system is connected to the inlet of the vertical subsurface flow artificial wetland system, and the outlet of the vertical subsurface flow artificial wetland system is connected to the inlet of the surface flow artificial wetland system. Both the horizontal subsurface flow artificial wetland system and the vertical subsurface flow artificial wetland system are provided with outlets at different heights, which are connected to the subsurface flow wetland PLC water level automatic control system, and the water body is discharged after passing through the surface flow artificial wetland system.

[0005] As a preferred embodiment, the pre-pond system is composed of a pre-pond and a water-lifting aeration device and a flow-pushing aeration device arranged at the rear section of the pre-pond. The water-lifting aeration device and the flow-pushing aeration device are both connected to the aeration device PLC control cabinet. The pre-pond is used to precipitate the settleable suspended matter in the water body. The water-lifting aeration device and the flow-pushing aeration device are used to form a fountain landscape and improve the dissolved oxygen and fluidity of the water body. The water-lifting aeration system composed of the water-lifting aeration device and the PLC automatic timing control system of the aeration device PLC control cabinet can automatically lift water and aerate at a fixed time to form a fountain landscape, while enhancing the dissolved oxygen in the water body, strengthening the role of aerobic microorganisms in the water body, and having a certain removal effect on COD and ammonia nitrogen; the flow-pushing aeration device is arranged at the rear section of the pre-pond, and can effectively enhance the fluidity of the water body in the pre-pond without interfering with the precipitation of the settleable suspended matter, increase the dissolved oxygen content of the water body, avoid the polluted water body from causing a large amount of algae growth due to the limitations of the pre-pond structure, and even cause black and smelly phenomena, and effectively improve the microecological environment of the water body.

[0006] Preferably, the nano-flotation filter system comprises a flotation tank and a nano-aeration device. The polluted water enters the flotation filter to remove the suspended solids that are difficult to settle in the water, further reducing the concentration of suspended solids in the water. The nano-aeration device increases the dissolved oxygen in the water in a short time, ensures the dissolved oxygen level of the artificial wetland system influent, strengthens the removal of pollutants such as ammonia nitrogen and COD by aerobic bacteria such as nitrifying bacteria, and makes the bionic water grass-plant wetland do not need to be equipped with an aeration device, reducing investment; the flotation tank is composed of a nano-aeration tank, a solid-liquid separation tank, and a cleaning tank. The nano aeration device is composed of a water tank and a scum collection tank. The nano aeration device is composed of a water supply pump, an aeration head assembly and a main unit. The nano aeration tank is equipped with a water supply pump and an aeration head assembly. The water supply pump and the aeration head assembly are connected to the main unit. After the polluted water enters the nano flotation system from the front pond, it first enters the nano aeration tank for sufficient gas-water mixing, and then enters the solid-liquid separation tank for solid-liquid separation. The suspended matter is combined with the nano bubbles and is in the upper layer, and then enters the scum collection tank and is discharged out of the system. The clean water with the suspended matter removed enters the clean water tank and then enters the artificial wetland system.

[0007] Preferably, the microbial agent dosing system includes a ton barrel, an agitator, a dosing valve, a dosing pump and a second flow meter. The agitator is installed in the ton barrel, and the outlet of the ton barrel is connected to the bionic aquatic plant-plant wetland system through the dosing pump. The dosing valve is installed at the outlet of the ton barrel, and the second flow meter is installed on the pipeline connecting the dosing pump and the bionic aquatic plant-plant wetland system. The dosing amount is controlled by the dosing valve and the second flow meter; the microbial agent dosing system adds screened microbial agents to the artificial wetland system during the startup period of the artificial wetland, which can accelerate the bionic aquatic plant and plant root biofilm growth rate in the bionic aquatic plant-plant wetland, and accelerate the construction of the subsurface wetland microbial system, thereby enhancing the water purification effect of the artificial wetland.

[0008] Preferably, the bionic aquatic plant-plant wetland system consists of a bionic aquatic plant-plant wetland and a bionic aquatic plant-plant floating island, and the bionic aquatic plant-plant floating island consists of aquatic plants, floating bodies and bionic aquatic plants. The polluted water body passes through the bionic aquatic plant-plant wetland system, and the aquatic plants and bionic aquatic plants absorb the residual suspended matter in the water body and gradually form a microbial film on the surface, thereby removing COD, ammonia nitrogen, SS, total nitrogen and total phosphorus pollutants in the water body and reducing the suspended matter concentration of the artificial wetland influent.

[0009] Preferably, the horizontal subsurface flow artificial wetland system is composed of horizontal subsurface flow artificial wetland aquatic plants and horizontal subsurface flow artificial wetland matrix. The horizontal subsurface flow artificial wetland aquatic plants are an aquatic plant community composed of a variety of aquatic plants according to their growth characteristics and functions. The horizontal subsurface flow artificial wetland matrix is ​​a growth matrix for horizontal subsurface flow artificial wetland aquatic plants composed of a variety of functional fillers according to artificial wetland design standards. The water distribution of the horizontal subsurface flow artificial wetland system is horizontal.

[0010] Preferably, the vertical subsurface flow artificial wetland system is composed of vertical subsurface flow artificial wetland aquatic plants and a vertical subsurface flow artificial wetland matrix. The vertical subsurface flow artificial wetland aquatic plants are an aquatic plant community composed of a variety of aquatic plants according to their growth characteristics and functions. The vertical subsurface flow artificial wetland matrix is ​​a growth matrix for vertical subsurface flow artificial wetland aquatic plants composed of a variety of functional fillers according to artificial wetland design standards. The water distribution of the vertical subsurface flow artificial wetland system is in a vertical direction.

[0011] Preferably, the submerged flow wetland PLC water level automatic control system is composed of a PLC main control cabinet and a first solenoid valve, a second solenoid valve, a third solenoid valve and a fourth solenoid valve, and the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve are all connected to the PLC main control cabinet; the submerged flow wetland includes a horizontal submerged flow wetland and a vertical submerged flow wetland, both of which are provided with water outlets at different heights, and the water outlets are provided with solenoid valves controlled by the PLC automatic control system. Specifically: the horizontal submerged flow artificial wetland system is provided with water outlets at different heights, and the water outlets are provided with the first solenoid valve and the second solenoid valve controlled by the PLC main control cabinet; the vertical submerged flow artificial wetland system Water outlets at different heights are provided, and the water outlets are provided with a third solenoid valve and a fourth solenoid valve controlled by a PLC main control cabinet; the water outlets at different heights are controlled by the PLC water level automatic control system of the submerged flow wetland to open the water outlets at regular intervals, so that the water levels of the horizontal submerged flow artificial wetland system and the vertical submerged flow artificial wetland system alternately operate in a periodic pattern of high water level-low water level-high water level, so as to form a fixed-period water-land interlaced zone, expand the "hot zone" of anaerobic ammonia-oxidizing bacteria, strengthen the anaerobic ammonia-oxidizing denitrification process of the submerged flow artificial wetland, strengthen the denitrification effect of the artificial wetland, and at the same time release the ammonia nitrogen adsorbed in the filler, thereby extending the service life of the artificial wetland filler and extending the operating life of the artificial wetland.

[0012] Preferably, the subsurface wetland is not limited to the types or combinations of subsurface wetlands, the subsurface wetland is not limited to the types, functions and combinations of fillers, the aquatic plants planted in the subsurface wetland are not limited to the types and reasonable densities of aquatic plants that can grow normally under suitable climatic conditions, and the main function of the plants is to absorb nutrients such as nitrogen and phosphorus in the water body, purify water quality, dredge wetland pores and prevent blockage.

[0013] Preferably, the surface flow artificial wetland system includes surface flow artificial wetland aquatic plants, which are aquatic plant communities composed of various aquatic plants according to their growth characteristics and functions. The polluted water enters the surface flow artificial wetland system through the vertical subsurface flow artificial wetland system, and is again intercepted and absorbed by the surface flow artificial wetland aquatic plants and degraded by microorganisms to remove pollutants in the water.

[0014] An artificial wetland technology for preventing clogging and strengthening anaerobic ammonium oxidation denitrification comprises the following steps:

[0015] (1) The polluted water passes through the filter grid to remove debris and larger suspended solids in the water, and then enters the pre-treatment system consisting of a pre-pond system and a nano-flotation filter system. The pre-pond is used to precipitate the suspended solids and COD in the polluted water, and then the nano-flotation filter is used to remove the suspended solids that are difficult to settle in the water, further reducing the concentration of suspended solids in the water. At the same time, the polluted water is aerated to increase the dissolved oxygen level in the water.

[0016] (2) After passing through the pre-treatment system, the polluted water enters the artificial wetland system. First, the plant roots of the bionic water grass-plant wetland system and the bionic water grass in the water further adsorb the residual suspended solids in the water. In combination with the microbial agent dosing system, microorganisms are added to form a microbial film to remove SS, COD, ammonia nitrogen, total phosphorus and total nitrogen in the water. At the same time, ammonia nitrogen is converted into nitrate nitrogen or nitrite nitrogen to provide substrate for anaerobic ammonia oxidation in the subsurface wetland. Then, the water enters a multi-stage subsurface wetland composed of a horizontal subsurface artificial wetland system and a vertical subsurface artificial wetland system. Through sedimentation, filtration, adsorption, microbial degradation and plant absorption, pollutants such as SS, COD, ammonia nitrogen, total phosphorus and total nitrogen in the water are removed. Finally, the polluted water enters the surface flow artificial wetland system to further remove pollutants such as nitrogen and phosphorus in the water and discharge them.

[0017] (3) During the operation of the artificial wetland system, the water level of the submerged flow artificial wetland ecosystem is periodically adjusted through the submerged flow wetland PLC water level automatic control system, so that the water level of the artificial wetland ecosystem maintains a high water level-low water level-high water level operation mode, forming a controllable periodic water-land transition zone. The periodic water-land transition zone can effectively increase the abundance of anaerobic ammonia-oxidizing bacteria, thereby enhancing the denitrification efficiency of anaerobic ammonia-oxidizing bacteria, enhancing the denitrification capacity of artificial wetlands, removing ammonia nitrogen, nitrate nitrogen and total nitrogen in the water body, and achieving complete denitrification of polluted water bodies and purifying water quality.

[0018] Preferably, in the pre-treatment system of step (1), the settleable suspended solids in the water body are precipitated in the front section of the pre-pond, and the water-lifting aeration and plug-flow aeration methods are used in the rear section of the pre-pond to enhance the dissolved oxygen and fluidity of the water body, thereby avoiding the deterioration of the water quality of the pre-pond water body and causing secondary pollution; a nano-flotation filter is used to remove the suspended solids that are difficult to settle in the water body, thereby further reducing the concentration of suspended solids in the water body, and the polluted water body can effectively improve the dissolved oxygen level of the influent of the bionic aquatic plant-plant wetland by passing through the nano-flotation filter, without the need to set up an aeration system for the bionic aquatic plant-plant wetland system, thereby saving construction and operation costs and improving the treatment effect.

[0019] Preferably, in the step (2), bionic aquatic plants-plant wetlands are used to further absorb suspended matter in the water body, reduce the concentration of suspended matter in the subsurface wetland inlet, and remove ammonia nitrogen, COD, total phosphorus and total nitrogen in the water body through the microbial film formed by plant roots and bionic aquatic plants; a multi-stage artificial wetland series connection method of bionic aquatic plants-plant wetlands → horizontal subsurface wetlands → vertical subsurface wetlands → surface flow wetlands is used to remove pollutants in the water body and purify the water quality.

[0020] Preferably, in step (3), a PLC water level automatic control system is used to enable the artificial wetland ecosystem to form a controllable periodic land-water ecotone, which is a "hot zone" for anaerobic ammonium oxidation denitrification. The controllable periodic land-water ecotone can effectively increase the abundance of anaerobic ammonium oxidation bacteria, strengthen the anaerobic ammonium oxidation denitrification process, and achieve efficient denitrification.

[0021] The beneficial effects of the present invention are as follows: the system and its use method adopt a pre-pond, a nano-flotation filter tank, bionic aquatic plants and plant roots, and gradually remove suspended matter in the water body through measures such as sedimentation, flotation separation and adsorption, reduce the concentration of suspended matter in the water inlet of the subsurface flow wetland, reduce the risk of blockage of the artificial wetland, and extend the operating life of the artificial wetland; it can expand the water-land ecotone of the artificial wetland by forming a controllable water-land ecotone, strengthen the anaerobic ammonia oxidation "hot zone", achieve complete denitrification of polluted water bodies, improve the nitrogen and phosphorus removal effect in sewage treatment, remove pollutants such as COD, ammonia nitrogen, total nitrogen and total phosphorus in the water body, purify water quality, and improve the water ecological environment, and the anaerobic ammonia oxidation bacteria can effectively release the artificial wetland filler to adsorb ammonia nitrogen, extend the replacement time of the artificial wetland filler, and increase the operating life of the artificial wetland. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments;

[0023] Figure 1 is a system plan view of the present invention;

[0024] Figure 2 is a process flow chart of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the bionic water grass-plant floating island in the bionic water grass-plant wetland system of the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the flotation tank in the nano flotation filter system of the present invention. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0028] Reference Figure 1-4 This specific implementation adopts the following technical scheme: it includes a water inlet system 1, a pretreatment system and an artificial wetland system, and the water inlet system 1, the pretreatment system and the artificial wetland system are connected in sequence; the water inlet system 1 includes a filter grid 1-1, a water inlet lift pump 1-2, a water inlet valve 1-3 and a first flow meter 1-4, the pretreatment system includes a pre-pond system 2 and a nano-flotation filter system 4, and the artificial wetland system is composed of a microbial agent dosing system 6, a bionic aquatic plant wetland system 7, a horizontal submerged flow artificial wetland system 9, a submerged flow wetland PLC water level automatic control system 10, a vertical submerged flow artificial wetland system 11, and a surface flow artificial wetland system 12.

[0029] The filter grid 1-1 is placed in the polluted water body, the outlet of the water inlet lift pump 1-2 is connected to the water inlet of the pre-pond system 2, and the polluted water body is pumped into the pre-treatment system. The water inlet valve 1-3 and the first flow meter 1-4 are installed on the pipeline connecting the water inlet lift pump 1-2 and the pre-pond system 2. The outlet of the pre-pond system 2 is connected to the water inlet of the nano-flotation filter system 4 through a pipeline, and a first control valve 3 is provided on the pipeline. The pre-pond system 2 is used to precipitate the settleable suspended matter in the water body, and the nano-flotation filter system 4 is used to separate the difficult-to-settle suspended matter in the water body and aerate the polluted water body to increase the dissolved oxygen in the water body. The outlet of the nano-flotation filter system 4 is connected to the bionic water grass-plant wetland system 7, and a second control valve 5 is provided between the two. After the polluted water passes through the pre-treatment system, it first passes through the bionic aquatic plant-plant wetland system 7. The bionic aquatic plant-plant wetland system 7 is connected to the dosing port of the microbial agent dosing system 6. At the initial start-up of the system or when the water output effect decreases, the microbial agent dosing system 6 adds microbial agents to the bionic aquatic plant-plant wetland system 7, and the microbial agent dosing system 6 pumps the microbial agents into the bionic aquatic plant-plant wetland system 7. After the polluted water passes through the bionic aquatic plant wetland, it enters the horizontal submerged flow artificial wetland system 9. The water inlet of the horizontal submerged flow artificial wetland system 9 is connected to the water outlet of the bionic aquatic plant-plant wetland system 7 through a pipeline. A third control valve 8 is provided on the pipeline. The horizontal submerged flow artificial wetland system 9 is provided with outlets at different heights. The water outlet is controlled by the subsurface wetland PLC water level automatic control system 10, so that the horizontal subsurface artificial wetland system 9 forms a periodic water level change; the outlet of the horizontal subsurface artificial wetland system 9 is connected with the inlet of the vertical subsurface artificial wetland system 11, and the polluted water enters the vertical subsurface artificial wetland system 11 after passing through the horizontal subsurface artificial wetland system 9. The vertical subsurface artificial wetland system 11 is provided with outlets at different heights, which are controlled by the subsurface wetland PLC water level automatic control system 10, so that the vertical subsurface artificial wetland system 11 forms a periodic water level change; the outlet of the vertical subsurface artificial wetland system 11 is connected with the inlet of the surface flow artificial wetland system 12 to receive the polluted water and discharge it after passing through the surface flow artificial wetland system 12.

[0030] It is worth noting that the filter grid 1-1 is arranged at the water inlet of the water inlet system 1, and is used to remove debris and larger suspended matter in the water body. After the polluted water body is filtered through the filter grid 1-1, it enters the pretreatment system through the water inlet lift pump 1-2. A water inlet valve 1-3 and a first flow meter 1-4 are arranged between the water inlet lift pump 1-2 and the pretreatment system, and the water inlet flow rate is controlled by the water inlet valve 1-3 and the first flow meter 1-4.

[0031] The front pond system 2 includes a front pond 2-1 and a water-lifting aeration device 2-3 and a flow-pushing aeration device 2-4 which are arranged at the rear section of the front pond 2-1 and are connected and controlled by an aeration device PLC control cabinet 2-2. The water-lifting aeration device 2-3 and the flow-pushing aeration device 2-4 are both used for precipitating the settleable suspended matter in the water body, and the water-lifting aeration device 2-3 and the flow-pushing aeration device 2-4 are used for forming a fountain landscape, while enhancing the water dynamics and dissolved oxygen of the water body in the front pond 2-1, and preventing the front pond 2-1 from causing algal bloom due to poor water fluidity. The water-lifting aeration system composed of the water-lifting aeration device 2-3 and the PLC automatic timing control system of the aeration device PLC control cabinet 2-2 can automatically and regularly lift water for aeration to form a fountain landscape, while enhancing the dissolved oxygen in the water body, strengthening the role of aerobic microorganisms in the water body, and having a certain removal effect on COD and ammonia nitrogen; the plug flow aeration device 2-4 is arranged in the rear section of the front pond 2-1, and can effectively enhance the fluidity of the front pond water body without interfering with the precipitation of settleable suspended matter, increase the dissolved oxygen content of the water body, avoid the large-scale growth of algae in the polluted water body due to the limitations of the front pond structure, and even cause black and smelly phenomena, and effectively improve the microecological environment of the water body.

[0032] The nano-flotation filter system 4 includes a flotation tank and a nano-aeration device. The polluted water enters the flotation filter to remove the suspended matter that is difficult to settle in the water, and further reduce the concentration of suspended matter in the water. The nano-aeration device increases the dissolved oxygen in the water in a short time, ensures the dissolved oxygen level of the artificial wetland system influent, strengthens the removal effect of aerobic bacteria such as nitrifying bacteria on pollutants such as ammonia nitrogen and COD, so that the bionic aquatic plant wetland does not need to be equipped with an aeration device, reducing investment; the flotation tank is composed of a nano-aeration tank 4-1, a solid-liquid separation tank 4-2, a clear water tank 4-3 and a scum collection tank 4-7. The nano-aeration device is used for aeration of the flotation tank to perform aeration. The nanometer aeration tank 4-1 is equipped with a water supply pump 4-4 and an aeration head assembly 4-5, and the water supply pump 4-4 and the aeration head assembly 4-5 are connected to the main unit 4-6. After the polluted water enters the nanometer air flotation system from the front pond, it first enters the nanometer aeration tank 4-1 for sufficient water and gas mixing, and then enters the solid-liquid separation tank 4-2 for solid-liquid separation. The suspended matter is combined with the nanometer bubbles and is in the upper layer, and enters the scum collection tank 4-7, and is discharged from the system. The clean water with the suspended matter removed enters the clean water tank 4-3, and then enters the artificial wetland system.

[0033] The microbial agent dosing system 6 includes a ton barrel 6-1, an agitator 6-2, a dosing valve 6-3, a dosing pump 6-4 and a second flow meter 6-5. The agitator 6-2 is installed in the ton barrel 6-1. The outlet of the ton barrel 6-1 is connected to the bionic water grass-plant wetland system 7 through the dosing pump 6-4. The dosing valve 6-3 is installed at the outlet of the ton barrel 6-1. The second flow meter 6-5 is installed on the pipeline connecting the dosing pump 6-4 and the bionic water grass-plant wetland system 7. Gate 6-3 and the second flow meter 6-5 control the dosage; the microbial agent dosing system 6 adds screened microbial agents to the artificial wetland system during the startup period of the artificial wetland, which can accelerate the biomimetic water grass and plant root biofilm growth rate in the bionic water grass-plant wetland, and accelerate the construction of the submerged wetland microbial system, while improving the relatively low microbial content in the submerged wetland and surface wetland in the artificial wetland system during the startup period. The poor water purification effect is caused by the relatively low content of microorganisms, and the water purification effect of the artificial wetland is enhanced.

[0034] The bionic aquatic plant wetland system 7 is composed of a bionic aquatic plant wetland 7-1 and a bionic aquatic plant floating island. The bionic aquatic plant floating island is composed of aquatic plants 7-2, floating bodies 7-3 and bionic aquatic plants 7-4. After the polluted water body pretreatment system enters the artificial wetland system, it first passes through the bionic aquatic plant wetland system 7. The aquatic plants 7-2 and bionic aquatic plants 7-4 have a certain adsorption effect, which can adsorb the residual suspended matter in the water body and gradually form a microbial film on the surface to remove COD, ammonia nitrogen, SS, total nitrogen and total phosphorus pollutants in the water body, and further reduce the concentration of suspended matter in the artificial wetland inlet.

[0035] In addition, the horizontal subsurface flow artificial wetland system 9, the subsurface flow wetland PLC water level automatic control system 10, and the vertical subsurface flow artificial wetland system 11 constitute a subsurface flow artificial wetland system, wherein the horizontal subsurface flow artificial wetland system 9 is composed of horizontal subsurface flow artificial wetland aquatic plants 9-1 and horizontal subsurface flow artificial wetland matrix 9-2. The horizontal subsurface flow artificial wetland aquatic plants 9-1 are aquatic plant communities composed of a variety of aquatic plants according to growth characteristics and functions. The horizontal subsurface flow artificial wetland matrix 9-2 is a growth matrix of the horizontal subsurface flow artificial wetland aquatic plants 9-1 composed of a variety of functional fillers according to artificial wetland design standards. The water distribution of the horizontal subsurface flow artificial wetland system 9 is horizontal. The vertical subsurface flow artificial wetland system 11 is composed of vertical subsurface flow artificial wetland aquatic plants 11-1 and vertical subsurface flow artificial wetland matrix 11-2. The vertical subsurface flow artificial wetland aquatic plants 11-1 are an aquatic plant community composed of a variety of aquatic plants according to their growth characteristics and functions. The vertical subsurface flow artificial wetland matrix 11-2 is a growth matrix of the vertical subsurface flow artificial wetland aquatic plants 11-1 composed of a variety of functional fillers according to artificial wetland design standards. The water distribution of the vertical subsurface flow artificial wetland system 11 is in a vertical direction. The submerged wetland PLC water level automatic control system 10 is composed of a PLC main control cabinet 10-1 and a first solenoid valve 10-2, a second solenoid valve 10-3, a third solenoid valve 10-4 and a fourth solenoid valve 10-5. The first solenoid valve 10-2, the second solenoid valve 10-3, the third solenoid valve 10-4 and the fourth solenoid valve 10-5 are all connected to the PLC main control cabinet 10-1; the submerged wetland is provided with water outlets at different heights, and the water outlets are provided with solenoid valves controlled by the PLC automatic control system. Specifically: the horizontal submerged artificial wetland system 9 is provided with water outlets at different heights. The outlet is provided with a first solenoid valve 10-2 and a second solenoid valve 10-3 controlled by a PLC main control cabinet 10-1; the vertical submerged flow artificial wetland system 11 is provided with outlets at different heights, and the outlet is provided with a third solenoid valve 10-4 and a fourth solenoid valve 10-5 controlled by a PLC main control cabinet 10-1; the submerged flow wetland PLC water level automatic control system 10 controls the water outlets at different heights to open them at regular intervals, so that the water levels of the horizontal submerged flow artificial wetland system 9 and the vertical submerged flow artificial wetland system 11 alternately operate in a periodic pattern of high water level-low water level-high water level.

[0036] After passing through the bionic aquatic plant-plant wetland system 7, the polluted water body enters the horizontal subsurface artificial wetland system 9, and then enters the vertical subsurface artificial wetland system 11. When passing through the horizontal subsurface artificial wetland system 9 and the vertical subsurface artificial wetland system 11, the polluted water body removes pollutants in the water body through filtration, ion exchange, plant absorption, microbial degradation and the like. At the same time, the subsurface wetland PLC water level automatic control system 10 can automatically control the water levels of the horizontal subsurface artificial wetland system 9 and the vertical subsurface artificial wetland system 11 to perform a periodic alternating operation of high water level-low water level-high water level, so as to form a fixed period of water-land interlaced zone, expand the "hot zone" of anaerobic ammonia oxidizing bacteria, strengthen the anaerobic ammonia oxidizing bacterial community, strengthen the anaerobic ammonia oxidizing denitrification process of the subsurface artificial wetland, strengthen the denitrification effect of the artificial wetland, realize the complete denitrification of the polluted water body, and at the same time effectively release the ammonia nitrogen adsorbed in the filler, prolong the service life of the artificial wetland filler, and prolong the operation life of the artificial wetland.

[0037] It should be noted that the subsurface wetland is not limited to the types or combinations of subsurface wetlands, the subsurface wetland is not limited to the types, functions and combinations of fillers, and the aquatic plants planted in the subsurface wetland are not limited to the types and reasonable densities of aquatic plants that can grow normally under suitable climatic conditions. The main function of the plants is to absorb nutrients such as nitrogen and phosphorus in the water, purify water quality, dredge wetland pores and prevent blockage.

[0038] In addition, the surface flow artificial wetland system 12 includes surface flow artificial wetland aquatic plants 12-1. The surface flow artificial wetland aquatic plants 12-1 are an aquatic plant community composed of various aquatic plants according to their growth characteristics and functions. The polluted water body enters the surface flow artificial wetland system 12 through the vertical subsurface flow artificial wetland system 11, and is again intercepted and absorbed by the surface flow artificial wetland aquatic plants 12-1 and degraded by microorganisms to remove pollutants such as COD, total nitrogen, total phosphorus, etc. in the water body, and is finally discharged.

[0039] An artificial wetland technology for preventing clogging and strengthening anaerobic ammonium oxidation denitrification comprises the following steps:

[0040] (1) The polluted water body is intercepted by the filter grid 1-1 to remove the debris and large suspended solids in the water body, and then enters the pre-treatment system composed of the pre-pond system 2 and the nano-flotation filter system 4. First, the pre-pond 2-1 is used to precipitate and remove the suspended solids and COD in the polluted water body. In addition, the middle and rear ends of the pre-pond are provided with a water lifting aeration system and a plug flow aeration system for oxygenation and improving the fluidity of the water body, so as to avoid the deterioration of the water quality of the pre-pond water body due to low dissolved oxygen content or poor fluidity. Then, the polluted water body enters the nano-aeration filter after passing through the pre-pond. The nano-flotation filter removes the suspended solids in the water body that are difficult to remove by sedimentation, further reducing the concentration of suspended solids in the water body. At the same time, the polluted water body is aerated to improve the dissolved oxygen level of the influent of the artificial wetland system.

[0041] (2) After passing through the pre-treatment system, the polluted water body enters the artificial wetland system, and first enters the bionic water grass-plant wetland 7-1, where the residual suspended solids in the water body are further adsorbed by the plant roots and the bionic water grass in the water body, and the soluble organic matter in the water body is removed. In combination with the microbial agent dosing system 6, microorganisms are added to form a microbial film on the plant roots and the surface of the bionic water grass to remove pollutants such as SS, COD, ammonia nitrogen, total phosphorus and total nitrogen in the water body, and at the same time, ammonia nitrogen is converted into nitrate nitrogen or nitrite nitrogen to provide a substrate for anaerobic ammonia oxidation in the subsurface wetland; then it enters the multi-stage subsurface wetland composed of the horizontal subsurface artificial wetland system 9 and the vertical subsurface artificial wetland system 11, and removes pollutants such as SS, COD, ammonia nitrogen, total phosphorus and total nitrogen in the water body through processes such as sedimentation, filtration, adsorption, microbial degradation and plant absorption; finally, the polluted water body enters the surface flow artificial wetland system 12 to further remove pollutants such as nitrogen and phosphorus in the water body and discharge;

[0042] (3) During the operation of the artificial wetland system, the water level of the submerged flow artificial wetland ecosystem is periodically adjusted through the submerged flow wetland PLC water level automatic control system 10, and the artificial wetland is controlled to maintain an alternating operation mode of high water level-low water level-high water level, so that the artificial wetland ecosystem forms a controllable periodic water-land transition zone. The periodic water-land transition zone can effectively increase the abundance of anaerobic ammonia-oxidizing bacteria, thereby enhancing the denitrification efficiency of anaerobic ammonia-oxidizing bacteria, strengthening the anaerobic ammonia-oxidizing bacterial community in the artificial wetland, and enhancing the denitrification capacity of the artificial wetland, removing ammonia nitrogen, nitrate nitrogen and total nitrogen content in the water body, achieving complete denitrification of polluted water bodies, purifying water quality, and effectively alleviating the saturation time of the filler in the artificial wetland that has an adsorption effect on ammonia nitrogen, thereby extending the operating life of the artificial wetland.

[0043] It is noteworthy that in the step (1), the pre-treatment system adopts the method of precipitating the settleable suspended solids in the water body in the front section of the front pond, and adopts the method of water lifting aeration and plug flow aeration in the rear section of the front pond to enhance the dissolved oxygen and fluidity of the water body, thereby avoiding the deterioration of the water quality of the front pond and causing secondary pollution; the nano-flotation filter is used to remove the suspended solids that are difficult to settle in the water body, thereby further reducing the concentration of suspended solids in the water body, and the polluted water body can effectively improve the dissolved oxygen level of the influent of the bionic aquatic plant-plant wetland by passing through the nano-flotation filter, and there is no need to set up an aeration system for the bionic aquatic plant-plant wetland system, thereby saving construction and operation costs and improving the treatment effect.

[0044] In the step (2), bionic aquatic plants-plant wetlands are used to further absorb suspended matter in the water body, reduce the concentration of suspended matter in the subsurface wetland inlet, and remove ammonia nitrogen, COD, total phosphorus and total nitrogen in the water body through the microbial film formed by plant roots and bionic aquatic plants; a multi-stage artificial wetland series connection method of bionic aquatic plants-plant wetlands → horizontal subsurface wetlands → vertical subsurface wetlands → surface flow wetlands is used to remove pollutants in the water body and purify the water quality.

[0045] In the step (3), the PLC water level automatic control system is used to form a controllable periodic land-water ecotone in the artificial wetland ecosystem. The land-water ecotone is a "hot zone" for anaerobic ammonium oxidation denitrification. The controllable periodic land-water ecotone can effectively increase the abundance of anaerobic ammonium oxidation bacteria, strengthen the anaerobic ammonium oxidation denitrification process, and achieve efficient denitrification.

[0046] When the present specific implementation mode is working, the polluted water body passes through the filter grid 1-1 to remove the sundries and larger suspended solids in the water body, and enters the pre-treatment system through the water inlet lift pump 1-2. After the polluted water body enters the pre-treatment system, it first passes through the pre-pond system 2, and the settleable suspended solids in the water body gradually settle in the front section of the pre-pond system 2. The water-lifting aeration device 2-3 and the plug flow aeration device 2-4 in the rear section of the pre-pond system 2 enhance the hydrodynamics and dissolved oxygen of the water body in the pre-pond system 2-1, and prevent the pre-pond 2-1 from deteriorating due to poor water fluidity and decreased dissolved oxygen. After the polluted water body passes through the pre-pond treatment system 2 and enters the nano-flotation filter tank system 4, it first enters the nano-aeration tank 4-1, and the nano-aeration device performs sufficient steam-water mixing. A part of the polluted water body is removed from the replenishment water. Pump 4-4 enters the main engine 4-6, and goes through the process of soda-water mixing → pressurized gas dissolution → gas-liquid separation → gas-liquid fluid acceleration → high-speed impact of enterprise fluid to break bubbles → secondary acceleration → release, and finally forms nanobubbles with negative charges on the surface, which can effectively adsorb and condense suspended particles, and then realize solid-liquid separation in the solid-liquid separation tank 4-2, the upper scum enters the scum collection tank 4-7, the lower clear water enters the clear water tank 4-3, and then enters the bionic aquatic plant-plant wetland system 7, the polluted water body contacts with the roots of aquatic plants 7-2 and bionic aquatic plants 7-4, the suspended solids remaining in the water body will be adsorbed on the surface by the roots of aquatic plants 7-2 and bionic aquatic plants 7-4, and gradually form a microbial film, and remove SS, COD, ammonia nitrogen, total phosphorus, total nitrogen and other pollutants in the water body through microbial absorption and degradation;In order to accelerate the growth of microbial film in the bionic aquatic plant-plant wetland system 7, microbial agents are added to the bionic aquatic plant-plant wetland system 7 through the microbial agent dosing system 6. The microbial agents are added to the ton barrel 6-1 for stirring and dilution, and then added to the bionic aquatic plant-plant wetland system 7 through the dosing pump 6-4. The microbial agent dosing system controls the dosage through the dosing valve 6-3 and the second flow meter 6-5. After the polluted water is discharged from the bionic aquatic plant-plant wetland system 7, it first enters the horizontal submerged flow artificial wetland system 9 and then enters the vertical submerged flow artificial wetland system 11. When the submerged flow artificial wetland system is in operation, the water level of the horizontal submerged flow artificial wetland system 9 and the vertical submerged flow artificial wetland system 11 is automatically controlled through the submerged flow wetland PLC water level automatic control system 10. The submerged flow wetland PLC water level automatic control system 10 controls the horizontal submerged flow artificial wetland system by the PLC control cabinet 10-1 The first solenoid valve 10-2 and the second solenoid valve 10-3 of the outlets at different heights of the vertical subsurface artificial wetland system 11 are periodically opened and closed, and the third solenoid valve 10-4 and the fourth solenoid valve 10-5 of the outlets at different heights of the vertical subsurface artificial wetland system 11 are periodically opened and closed, so that the water level is in a periodic operation of high water level-low water level-high water level, strengthening the water-land ecotone of the artificial wetland, enriching the anaerobic ammonia oxidation bacterial community, and strengthening the denitrification capacity of the artificial wetland. The polluted water body undergoes a series of effects such as filtration, adsorption, plant absorption, microbial degradation, oxidation and reduction in the subsurface artificial wetland system to remove pollutants such as SS, ammonia nitrogen, COD, total phosphorus and total nitrogen in the water body, and then enters the surface flow artificial wetland system 12, and is again intercepted and absorbed by plants and degraded by microorganisms to remove pollutants such as COD, total nitrogen, total phosphorus, etc. in the water body, purifying the water quality and improving the water ecological environment. ;

[0047] The technical advantages of this specific implementation method are: 1. Good denitrification and phosphorus removal effects: ecological floating islands are set in the plant filter tank in the system, and high-efficiency denitrification and phosphorus removal aquatic plants are planted to effectively remove nitrogen, phosphorus and other nutrients in the water body. In addition, artificial aquatic plants, plant roots and microorganisms form microbial films to further remove nitrogen, phosphorus and other nutrients in the water body; in addition, subsurface flow wetlands are equipped with outlets at different heights to control the operating water level of the artificial wetland, form a controllable water-land transition zone, strengthen the anaerobic ammonia-oxidizing bacterial community, and achieve complete denitrification of polluted water bodies.

[0048] ②Preventing clogging of artificial wetlands: Nano-aeration is used in the pre-treatment of artificial wetlands. The bubble diameter is small, the residence time is long, and it has a good flotation effect. After artificial salvage, the suspended matter in the water body can be effectively removed. In addition, an ecological floating island is set in the ecological filter tank, and aquatic plants with developed root systems are planted. Artificial aquatic plants are set under the ecological floating island. The developed plant roots and artificial aquatic plants can effectively absorb suspended matter in the water body and combine with microorganisms to form a microbial film, which further reduces the concentration of suspended matter in the artificial wetland inlet, prevents clogging of the artificial wetland, and increases the operating life of the artificial wetland.

[0049] This specific implementation method effectively solves the defects of the existing artificial wetland technology, such as relatively poor denitrification effect, poor removal effect of ammonia nitrogen in the polluted water body after the artificial wetland filler absorbs ammonia nitrogen to saturation, and high content of suspended matter in the polluted water body causing blockage of the artificial wetland. This technology can improve the current situation of polluted water bodies, effectively remove suspended matter, organic matter, nitrogen, phosphorus and other pollutants in the water body, especially by automatically controlling the water level to form a periodic water-land transition zone, forming an anaerobic ammonia oxidation "hot zone", strengthening the anaerobic ammonia oxidation effect, strengthening the anaerobic ammonia oxidation denitrification of the artificial wetland, releasing the ammonia nitrogen adsorbed by the filler, and extending the service life of the filler; at the same time, it can gradually remove the suspended matter in the subsurface wetland water by precipitation, flotation and adsorption, effectively reducing the operating load and blockage risk of the artificial wetland, accelerating the startup speed of the artificial wetland, and improving the operating life of the artificial wetland. The system and its use method are mainly used for comprehensive management of water environment in the basin, landscape and river eutrophication and black and odorous water body management, and have broad market application prospects.

[0050] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An artificial wetland system for preventing clogging and strengthening anaerobic ammonium oxidation denitrification, characterized in that: The invention comprises a water inlet system (1), a pretreatment system and an artificial wetland system, wherein the water inlet system (1), the pretreatment system and the artificial wetland system are connected in sequence; the water inlet system (1) comprises a filter grid (1-1), a water inlet lift pump (1-2), a water inlet valve (1-3) and a first flow meter (1-4); the pretreatment system comprises a pre-pond system (2) and a nano-air flotation filter system (4); the artificial wetland system comprises a microbial agent dosing system (6), a bionic aquatic plant wetland system (7), a horizontal subsurface artificial wetland system (9), a subsurface wetland PLC water level automatic control system (10), a vertical The invention is composed of a subsurface artificial wetland system (11) and a surface flow artificial wetland system (12); a filter grid (1-1) is placed in a polluted water body; an outlet of a water inlet lift pump (1-2) is connected to a water inlet of a pre-pond system (2); the polluted water body is pumped into the pre-treatment system; a water inlet valve (1-3) and a first flow meter (1-4) are installed on a pipeline connecting the water inlet lift pump (1-2) and the pre-pond system (2); the water inlet flow rate is controlled by the water inlet valve (1-3) and the first flow meter (1-4); the pre-pond system (2) is connected to a nanometer air flotation filter system (4); a first control valve (3) is provided in the middle; The pre-pond system (2) is used to precipitate settleable suspended matter in the water body, the nano-flotation filter system (4) is used to separate the difficult-to-settle suspended matter in the water body, and to aerate the polluted water body to increase the dissolved oxygen in the water body, the nano-flotation filter system (4) is connected to the bionic aquatic grass-plant wetland system (7), a second control valve (5) is arranged between the two, the bionic aquatic grass-plant wetland system (7) is connected to the dosing port of the microbial agent dosing system (6), the microbial agent dosing system (6) pumps the microbial agent into the bionic aquatic grass-plant wetland system (7), and the water outlet of the bionic aquatic grass-plant wetland system (7) is connected to the dosing port of the microbial agent dosing system (6). The water inlet of the horizontal subsurface artificial wetland system (9) is connected via a pipeline, a third control valve (8) is provided on the pipeline, the water outlet of the horizontal subsurface artificial wetland system (9) is connected to the water inlet of the vertical subsurface artificial wetland system (11), the water outlet of the vertical subsurface artificial wetland system (11) is connected to the water inlet of the surface flow artificial wetland system (12), the horizontal subsurface artificial wetland system (9) and the vertical subsurface artificial wetland system (11) are both provided with water outlets at different heights, which are connected to the subsurface wetland PLC water level automatic control system (10), and the water body is discharged after passing through the surface flow artificial wetland system (12); The pre-pond system (2) is composed of a pre-pond (2-1) and a water-lifting aeration device (2-3) and a flow-pushing aeration device (2-4) arranged at the rear section of the pre-pond (2-1). The water-lifting aeration device (2-3) and the flow-pushing aeration device (2-4) are both connected to an aeration device PLC control cabinet (2-2). The pre-pond (2-1) is used to precipitate suspended solids in the water body. The water-lifting aeration device (2-3) and the flow-pushing aeration device (2-4) are used to form a fountain landscape and simultaneously improve the dissolved oxygen and fluidity of the water body. The water-lifting aeration system composed of the water-lifting aeration device (2-3) and the PLC automatic timing control system of the aeration device PLC control cabinet (2-2) can automatically and regularly lift water for aeration to form a fountain landscape, while increasing the dissolved oxygen in the water body, strengthening the role of aerobic microorganisms in the water body, and having a certain removal effect on COD and ammonia nitrogen; The plug flow aeration device (2-4) is arranged at the rear section of the front pond (2-1), and can effectively enhance the fluidity of the water in the front pond without interfering with the sedimentation of settleable suspended matter, increase the dissolved oxygen content of the water, and avoid the large-scale growth of algae or even the occurrence of black and smelly phenomena in the polluted water due to the limitations of the front pond structure, thereby effectively improving the microecological environment of the water body; The nano-air flotation filter system (4) comprises an air flotation tank and a nano-aeration device. The polluted water enters the air flotation filter to remove the suspended matter that is difficult to settle in the water, further reducing the concentration of the suspended matter in the water. The nano-aeration device increases the dissolved oxygen in the water in a short time, ensures the dissolved oxygen level of the water entering the artificial wetland system, and strengthens the removal of ammonia nitrogen and COD pollutants by nitrifying bacteria. The air flotation tank is composed of a nano-aeration tank (4-1), a solid-liquid separation tank (4-2), a clear water tank (4-3) and a scum collection tank (4-7). The nano-aeration device is composed of a water supply pump (4-4), an aeration head assembly (4-5) and a main The nano aeration tank (4-1) is composed of a water supply pump (4-4) and an aeration head assembly (4-5), and the water supply pump (4-4) and the aeration head assembly (4-5) are connected to the main machine (4-6). After the polluted water enters the nano flotation system from the front pond, it first enters the nano aeration tank (4-1) for sufficient steam-water mixing, and then enters the solid-liquid separation tank (4-2) for solid-liquid separation. The suspended matter is combined with the nano bubbles and is in the upper layer, and enters the scum collection tank (4-7) and is discharged out of the system. The clean water with the suspended matter removed enters the clean water tank (4-3), and then enters the artificial wetland system. The bionic aquatic plant wetland system (7) is composed of a bionic aquatic plant wetland (7-1) and a bionic aquatic plant floating island. The bionic aquatic plant floating island is composed of aquatic plants (7-2), a floating body (7-3) and a bionic aquatic plant (7-4). When the polluted water body passes through the bionic aquatic plant wetland system (7), the aquatic plants (7-2) and the bionic aquatic plants (7-4) absorb the residual suspended matter in the water body and gradually form a microbial film on the surface, thereby removing COD, ammonia nitrogen, SS, total nitrogen and total phosphorus pollutants in the water body and reducing the concentration of suspended matter in the artificial wetland inlet water.

2. The anti-clogging and enhanced anaerobic ammonium oxidation denitrification artificial wetland system according to claim 1, characterized in that: The microbial agent dosing system (6) comprises a ton barrel (6-1), an agitator (6-2), a dosing valve (6-3), a dosing pump (6-4) and a second flow meter (6-5). The agitator (6-2) is installed in the ton barrel (6-1). The outlet of the ton barrel (6-1) is connected to the bionic aquatic plant wetland system (7) through the dosing pump (6-4). The dosing valve (6-3) is installed at the outlet of the ton barrel (6-1). The second flow meter (6-5) is installed on the pipeline connecting the dosing pump (6-4) and the bionic aquatic plant wetland system (7). The microbial agent dosing system (6) adds screened microbial agents to the artificial wetland system during the start-up period of the artificial wetland, which can accelerate the biofilm formation speed of the bionic aquatic plants and plant roots in the bionic aquatic plant wetland, accelerate the construction of the subsurface wetland microbial system, and enhance the water purification effect of the artificial wetland.

3. The anti-clogging and enhanced anaerobic ammonium oxidation denitrification artificial wetland system according to claim 1, characterized in that: The horizontal subsurface flow artificial wetland system (9) is composed of horizontal subsurface flow artificial wetland aquatic plants (9-1) and horizontal subsurface flow artificial wetland matrix (9-2). The horizontal subsurface flow artificial wetland aquatic plants (9-1) are aquatic plant communities composed of a variety of aquatic plants according to growth characteristics and functions. The horizontal subsurface flow artificial wetland matrix (9-2) is a growth matrix of the horizontal subsurface flow artificial wetland aquatic plants (9-1) composed of a variety of functional fillers according to artificial wetland design standards. The water distribution of the horizontal subsurface flow artificial wetland system (9) is in the horizontal direction. The vertical subsurface flow artificial wetland system (11) is composed of vertical subsurface flow artificial wetland aquatic plants (11-1) and vertical subsurface flow artificial wetland matrix (11-2). The vertical subsurface flow artificial wetland aquatic plants (11-1) are aquatic plant communities composed of a variety of aquatic plants according to their growth characteristics and functions. The vertical subsurface flow artificial wetland matrix (11-2) is a growth matrix of the vertical subsurface flow artificial wetland aquatic plants (11-1) composed of a variety of functional fillers according to artificial wetland design standards. The water distribution of the vertical subsurface flow artificial wetland system (11) is in a vertical direction.

4. The anti-clogging and enhanced anaerobic ammonium oxidation denitrification artificial wetland system according to claim 1, characterized in that: The submerged wetland PLC water level automatic control system (10) is composed of a PLC main control cabinet (10-1) and a first solenoid valve (10-2), a second solenoid valve (10-3), a third solenoid valve (10-4) and a fourth solenoid valve (10-5), wherein the first solenoid valve (10-2), the second solenoid valve (10-3), the third solenoid valve (10-4) and the fourth solenoid valve (10-5) are all connected to the PLC main control cabinet (10-1); the horizontal submerged artificial wetland system (9) is provided with water outlets at different heights, and the water outlets are provided with a control valve connected to the water outlets by the PLC main control cabinet (10 -1); the vertical submerged flow artificial wetland system (11) is provided with water outlets at different heights, and the water outlets are provided with a third solenoid valve (10-4) and a fourth solenoid valve (10-5) controlled by a PLC main control cabinet (10-1); the water levels of the horizontal submerged flow artificial wetland system (9) and the vertical submerged flow artificial wetland system (11) are controlled by the submerged flow wetland PLC water level automatic control system (10) to alternately operate in a periodic manner of high water level-low water level-high water level, so as to form a fixed periodic water-land interlaced zone.

5. The anti-clogging and enhanced anaerobic ammonium oxidation denitrification artificial wetland system according to claim 1, characterized in that: The surface flow artificial wetland system (12) includes surface flow artificial wetland aquatic plants (12-1). The surface flow artificial wetland aquatic plants (12-1) are aquatic plant communities composed of a variety of aquatic plants according to their growth characteristics and functions. The polluted water enters the surface flow artificial wetland system (12) through the vertical subsurface flow artificial wetland system (11), and is again intercepted and absorbed by the surface flow artificial wetland aquatic plants (12-1) and degraded by microorganisms to remove pollutants in the water.

6. The method for using a contrived wetland system for preventing clogging and strengthening anaerobic ammonium oxidation denitrification according to claim 1, characterized in that: The method of use includes the following steps: (1) The polluted water passes through a filter grid (1-1) to remove debris and larger suspended solids in the water, and then enters a pre-treatment system consisting of a pre-pond system (2) and a nano-flotation filter system (4). First, the pre-pond (2-1) is used to remove the settleable suspended solids and COD in the polluted water. A water-lifting aeration system and a plug-flow aeration system are provided at the middle and rear ends of the pre-pond to increase oxygen and improve the fluidity of the water, thereby preventing the water quality of the pre-pond from deteriorating due to low dissolved oxygen content or poor fluidity. After passing through the pre-pond, the polluted water enters the nano-aeration filter, and the nano-flotation filter removes suspended solids in the water that are difficult to remove by sedimentation, thereby further reducing the concentration of suspended solids in the water. At the same time, the polluted water is aerated to improve the dissolved oxygen level of the influent of the artificial wetland system. (2) After passing through the pre-treatment system, the polluted water enters the artificial wetland system. First, the plant roots of the bionic water grass-plant wetland system (7) and the bionic water grass in the water further adsorb the residual suspended solids in the water, remove the soluble organic matter in the water, and combine with the microbial agent dosing system (6) to add microorganisms to form a microbial film on the plant roots and the surface of the bionic water grass to remove SS, COD, ammonia nitrogen, total phosphorus and total nitrogen in the water. At the same time, the ammonia nitrogen is converted into nitrate nitrogen or nitrite nitrogen to provide a substrate for anaerobic ammonia oxidation in the subsurface wetland. Then, the water enters the multi-stage subsurface wetland composed of the horizontal subsurface artificial wetland system (9) and the vertical subsurface artificial wetland system (11). Through the processes of sedimentation, filtration, adsorption, microbial degradation and plant absorption, the pollutants of SS, COD, ammonia nitrogen, total phosphorus and total nitrogen in the water are removed. Finally, the polluted water enters the surface flow artificial wetland system (12) to further remove nitrogen and phosphorus pollutants in the water and discharge. (3) During the operation of the artificial wetland system, the water level of the submerged flow artificial wetland ecosystem is periodically adjusted through the submerged flow wetland PLC water level automatic control system (10), so that the water level of the artificial wetland ecosystem maintains a high water level-low water level-high water level operation mode, forming a controllable periodic water-land transition zone. The periodic water-land transition zone can effectively increase the abundance of anaerobic ammonia-oxidizing bacteria, thereby enhancing the denitrification efficiency of anaerobic ammonia-oxidizing bacteria, enhancing the denitrification capacity of artificial wetlands, removing ammonia nitrogen, nitrate nitrogen and total nitrogen in water bodies, and achieving complete denitrification of polluted water bodies and purifying water quality.

7. The method for using a contrived wetland system for preventing clogging and strengthening anaerobic ammonium oxidation denitrification according to claim 6, characterized in that: In the step (1), the pretreatment system uses the method of precipitating the settleable suspended solids in the water body in the front section of the front pond, and adopts the method of water lifting aeration and plug flow aeration in the rear section of the front pond to enhance the dissolved oxygen and fluidity of the water body, thereby avoiding the deterioration of the water quality of the front pond water body and causing secondary pollution; the nano-air flotation filter is used to remove the suspended solids that are difficult to settle in the water body, thereby further reducing the concentration of suspended solids in the water body, and the polluted water body can effectively improve the dissolved oxygen level of the influent of the bionic water grass-plant wetland by passing through the nano-air flotation filter, without the need to set up an aeration system for the bionic water grass-plant wetland system, thereby saving construction and operation costs and improving the treatment effect; In the step (2), the bionic aquatic grass-plant wetland is used to further absorb suspended matter in the water body, reduce the concentration of suspended matter in the subsurface wetland inlet, and remove ammonia nitrogen, COD, total phosphorus and total nitrogen in the water body through the microbial film formed by plant roots and bionic aquatic grass; a multi-stage artificial wetland series connection method of bionic aquatic grass-plant wetland → horizontal subsurface wetland → vertical subsurface wetland → surface flow wetland is used to remove pollutants in the water body and purify the water quality; In the step (3), the PLC water level automatic control system is used to form a controllable periodic land-water ecotone in the artificial wetland ecosystem. The land-water ecotone is a "hot zone" for anaerobic ammonium oxidation denitrification. The controllable periodic land-water ecotone can effectively increase the abundance of anaerobic ammonium oxidation bacteria, strengthen the anaerobic ammonium oxidation denitrification process, and achieve efficient denitrification.

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