Micro wetland construction process and linkage treatment system thereof

Abstract

The invention relates to the technical field of sewage treatment, in particular to a micro wetland construction process which comprises the following steps: step 1, sequentially arranging a sedimentation tank, a water inlet pump station, a double-channel treatment path, a root hole wetland + surface flow wetland, a stabilization pond and a water outlet pump station; 2, dividing a dual-channel processing path into a channel I and a channel II; 3, the root hole wetland and the surface flow wetland comprise a root hole wetland and a surface flow wetland; wherein the root hole wetland is a semi-saturated flow wetland formed by piling up reed straw mixed with natural original soil; a submerged fan aeration system is arranged at the bottom of the surface flow wetland; 4, emergent aquatic, floating-leaf and submerged plants are planted in the stabilization pond, and filter-feeding fishes and benthic snails and clams are put into the stabilization pond; adding a dephosphorization filler to the bottom of the stabilization pond; according to the invention, the small and micro wetland with small volume and large energy is built; the directional efficient treatment on specific pollutants is realized; reasonably distributing water as required; and inlet water diversion, outlet water and backflow regulation and control are realized through real-time data analysis and instruction transmission.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a micro-wetland construction process and a linkage treatment system thereof. Background Art

[0002] Artificial wetlands are extensions and enhancements of natural wetlands and are widely used in the purification of polluted water bodies. However, existing artificial wetland technology has certain disadvantages and limitations: (1) Traditional artificial wetlands have a low surface pollutant removal load, so they require a larger area to meet functional requirements, which limits the application of artificial wetlands; (2) Traditional artificial wet fillers are prone to clogging, reducing their operating life; (3) Wetland fillers are mostly traditional fillers such as volcanic rock, gravel, and expanded clay, which lack enhanced treatment capabilities; (4) The current wetland process lacks the setting of special treatment functional units and the ability to reasonably distribute water to different types of sewage; (5) The treatment processes in each functional area of ​​traditional wetlands are relatively independent, and there is a lack of linkage treatment and scheduling capabilities between functional areas.

[0003] Therefore, in view of the shortcomings and limitations of the above-mentioned existing artificial wetland technology, a high-efficiency micro-wetland construction process and a matching linkage treatment system can be designed. Summary of the invention

[0004] In order to overcome the problems of traditional artificial wetlands, such as large area, low surface pollutant removal load, easy clogging of fillers, poor pollutant treatment capacity of fillers, lack of special treatment functional units in wetland processes, reasonable water distribution capacity for different types of sewage, and lack of linkage treatment and scheduling capabilities between functional areas.

[0005] The technical solution of the present invention is: a micro-wetland construction process, the steps of which are as follows:

[0006] Step 1: In an area of ​​15000m 2 The following artificial wetlands are equipped with sedimentation tanks, water inlet pump stations, dual-channel treatment paths, root hole wetlands + surface flow wetlands, stabilization ponds and water outlet pump stations in sequence; the bottom of the sedimentation tank is hardened and anti-seepage treated; the water inlet pump station includes the first water outlet well and the first lifting pump, and the polluted water after sedimentation treatment flows into the dual-channel treatment path through the first lifting pump;

[0007] Step 2: The dual-channel treatment path is divided into channel one and channel two; channel one includes a rapid filtration device and a sheet phosphorus removal unit; channel two includes a sponge purification system and a deep denitrification unit;

[0008] The rapid filtration device in channel one includes a pretreatment unit and a first main reaction unit; the pretreatment unit is provided with a large particle filter screen, and the first main reaction unit is provided with a porous lightweight particle filter material; the bottom space of the rapid filtration device is provided with a first mud collection layer; the rapid filtration device quickly filters the polluted water before it enters the main body of the wetland, and efficiently filters and separates the suspended matter, algae and a small amount of colloidal substances in the polluted water, slows down the blockage of the wetland, and quickly reduces the COD of the polluted water body; the lamellar phosphorus removal unit in channel one is a flat rectangular gabion structure, which is provided with phosphorus removal functional fillers and conventional graded granular materials; the lamellar phosphorus removal units are arranged in a feather-like manner in the water body; the lamellar phosphorus removal units are immersed in water as a whole;

[0009] The sponge purification system in channel 2 includes a microbial screening and cultivation unit and a second main reaction unit; the microbial screening and cultivation unit is provided with a biological rope, and the second main reaction unit is provided with a denitrification functional composite material; a second mud layer is provided at the bottom space of the sponge purification system; the functional filler in the sponge purification system can preliminarily purify pollutants in the water, and at the same time, the polluted water body can carry functional bacteria to the subsequent process when flowing through the microbial carrier filler of the sponge purification system, thereby reducing the total nitrogen in the polluted water body and assisting in improving the pollutant removal load on the wetland surface; the deep denitrification unit in channel 2 is a stepped submerged flow wetland, and the stepped submerged flow wetland is provided with autotrophic denitrification fillers and conventional graded aggregates;

[0010] Step 3: Root hole wetland + surface flow wetland includes root hole wetland and surface flow wetland; the root hole wetland is a semi-saturated flow wetland made of reed straw mixed with natural original soil; the bottom of the surface flow wetland is equipped with a submerged fan aeration system;

[0011] Step 4: The stabilization pond is planted with emergent, floating-leaf and submerged plants, and filter-feeding fish and benthic snails and clams are placed in the stabilization pond; phosphorus removal fillers are added to the bottom of the stabilization pond; the outlet pump station includes a second outlet well and a second booster pump. After the polluted water is purified step by step in the micro-wetland, the water quality meets the standard and is discharged into the external water system through the second booster pump. If the water quality does not meet the standard, it will be returned to the micro-wetland for further treatment through the second booster pump.

[0012] Preferably, the autotrophic denitrification filler in the deep denitrification unit is a sulfide-iron autotrophic filler.

[0013] Preferably, the volume ratio of reed straw to natural soil is 1:5, the diameter of the reed straw is 0.3-1.2 cm, and the length is 0.5-1.2 m.

[0014] Preferably, sedimentation tanks, channel one, channel two, root hole wetlands, surface flow wetlands and stabilization ponds account for 4% to 6%, 15% to 20%, 10% to 15%, 0.8% to 1%, 35% to 42% and 18% to 20% of the total area of ​​micro-wetlands respectively.

[0015] A micro-wetland linkage treatment system, which includes the micro-wetland construction process as described above, and also includes an equipment layer, an analysis and calculation layer, and a cloud management layer;

[0016] The equipment layer includes operating equipment and data acquisition equipment. The operating equipment includes pumps, valves and fans. The data acquisition equipment includes the first water quality online monitor, the first flow acquisition equipment and the second flow acquisition equipment in the water inlet pump station, which are arranged in the sedimentation tank, for collecting water inlet and water distribution data. The second water quality online monitor and the third flow acquisition equipment in the water outlet pump station are arranged in the stabilization pond, for collecting water outlet data. The online dissolved oxygen meter arranged in the surface flow wetland area is used to collect the dissolved oxygen content of the water body. The equipment layer is used to collect the water quality and water quantity data of the inlet and outlet water of the micro-wetland system, the dissolved oxygen content of the water body, and transmit the collected water body data to the analysis and calculation layer of the linkage processing system.

[0017] The analysis and calculation layer includes pump stations, valves, fan control modules and data processing modules; the analysis and calculation layer is used to receive water quality, water volume and dissolved oxygen data transmitted by the equipment layer, analyze the data, generate corresponding processing signals, and send the processing signals to the cloud management layer of the linkage processing system; it is also used to receive command information transmitted by the cloud management layer, and generate control signals according to the command information and send them to the micro-wetland inlet and outlet pump stations and water pipeline valve control systems, and submerged fan control systems; the water inlet pump station and water pipeline valve control system control the water distribution volume of each channel of the micro-wetland based on the control signal; the water outlet pump station and water pipeline valve control system control the water outlet and backflow of the micro-wetland based on the control signal; the submerged fan control system controls the opening and closing of the aeration system based on the control signal.

[0018] The cloud management layer includes a cloud processor and a communication module; it is used to receive processing signals sent by the analysis and computing layer and generate instruction information based on the processing signals.

[0019] Preferably, the inlet data includes inlet water quality and water volume, and the inlet pump station and the water pipeline valve control system control the water distribution volume of each channel of the micro-wetland based on the control signal: when the total phosphorus concentration of the inlet water quality is greater than the preset value and the total nitrogen concentration is less than the preset value, the inlet pump station and the water pipeline valve control system start the micro-wetland channel one water distribution over-allocation mode to efficiently remove the total phosphorus in the water body; when the total nitrogen concentration of the inlet water quality is greater than the preset value and the total phosphorus concentration is less than the preset value, the inlet pump station and the water pipeline valve control system start the micro-wetland channel two water distribution over-allocation mode to efficiently remove the total nitrogen in the water body; when the inlet total nitrogen and total phosphorus concentrations are both less than the preset values, the inlet pump station and the water pipeline valve control system start the standard water distribution mode; when the inlet total nitrogen and total phosphorus concentrations are both greater than the preset values; the inlet pump station and the water pipeline valve control system start the channel two water distribution over-allocation mode, and the phosphorus removal filler added at the bottom of the stabilization pond assists in phosphorus removal to ensure the dual-effect removal of nitrogen and phosphorus.

[0020] Preferably, the standard water distribution mode means that the water distribution of channel one and channel two accounts for 40% and 60% of the total water intake respectively; the over-allocation mode of channel one means that the water distribution of channel one and channel two accounts for 55% and 45% of the total water intake respectively; the over-allocation mode of channel two means that the water distribution of channel one and channel two accounts for 30% and 70% of the total water intake respectively.

[0021] Preferably, the effluent data includes effluent quality and quantity, and the effluent pump station and the water pipeline gate valve control system control the micro-wetland effluent or backflow based on the control signal: when the effluent water quality meets the design requirements, the effluent pump station completes the discharge in compliance with the standards according to the control signal; when the effluent water quality does not meet the standards, the effluent pump station returns the unqualified sewage to the sedimentation tank according to the control signal, and the inlet pump station performs dual-channel water distribution treatment on the unqualified sewage again according to the control signal and water quality conditions until it meets the standards.

[0022] Beneficial effects of the present invention:

[0023] 1. By increasing the pollutant removal load on the wetland surface, the application limitation of traditional wetland technology, which occupies a large area, is solved, and a micro-wetland with "small volume and large energy" is created; the problem that traditional wetland fillers are easily blocked and cannot reach the designed operating life is solved by introducing rapid filtration devices and sponge purification systems; specific functional fillers are added to achieve directional and efficient treatment of specific pollutants; combined with the use of specific functional fillers, special functional units and multi-channel treatment systems are designed to achieve reasonable water distribution on demand; an intelligent linkage scheduling system is introduced to achieve water inlet diversion, water outlet and return flow control through real-time data analysis and command transmission;

[0024] 2. By setting up a rapid filtering device and a sponge purification system at the front end of the wetland body, the polluted water can be quickly filtered and preliminarily purified before entering the wetland body, and the suspended solids, algae and a small amount of colloidal substances in the polluted water can be efficiently filtered and separated. The functional fillers in the equipment can preliminarily purify the pollutants in the water and improve the treatment efficiency. At the same time, the polluted water can carry the functional bacteria to the subsequent process when flowing through the microbial carrier fillers in the sponge purification system, thereby reducing the blockage of the wetland body, quickly reducing the COD and total nitrogen of the polluted water, and assisting in improving the function of removing pollutants from the wetland surface;

[0025] 3. The micro-wetland process sets up a dual-channel treatment path. In addition to the functions of the traditional wetland process, each channel forms a channel 1 with enhanced phosphorus removal function and a channel 2 with deep nitrogen removal function through the application of new phosphorus removal materials and autotrophic denitrification fillers. The water distribution of each channel can be reasonably set according to the different concentrations of influent pollutants to achieve efficient removal of various pollutants and increase the pollutant removal load on the micro-wetland surface;

[0026] 4. Set up an intelligent linkage dispatching system to control the operation of the micro-wetland equipment layer through data collection, real-time data analysis and command transmission, realize on-demand diversion of inlet water, efficient dual-channel linkage processing, real-time regulation of outlet and return water, and intelligent operation of the wetland system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 What is shown is a schematic diagram of the micro-wetland structure of the present invention;

[0028] Figure 2 Shown is a schematic diagram of the framework of the micro-wetland linkage treatment system of the present invention;

[0029] Figure 3 The diagram shows the schematic diagram of the structure of the sheet phosphorus removal unit in the micro-wetland of the present invention, wherein (a) is a schematic diagram of the three-dimensional structure; (b) is a schematic diagram of the cross-sectional structure of the sheet phosphorus removal unit; (c) is a schematic diagram of the layout of the sheet phosphorus removal unit;

[0030] Figure 4 Shown is a schematic diagram of the cross-sectional structure of the deep denitrification unit in the micro-wetland of the present invention.

[0031] Explanation of the reference numerals: 1. Sedimentation tank; 2. Inlet pump station; 3. Rapid filtration device; 4. Sheet phosphorus removal unit; 42. Phosphorus removal functional filler; 5. Sponge purification system; 6. Deep denitrification unit; 61. Autotrophic denitrification filler; 62. Stepped subsurface flow wetland; 7. Root hole wetland + surface flow wetland; 8. Stabilization pond; 9. Outlet pump station. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] Example 1

[0034] When the wetland influent is 40<Cod≤80mg / L, 0.4<total phosphorus≤2mg / L, 2<total nitrogen≤8mg / L; the preset value of total phosphorus is 2mg / L, and the preset value of total nitrogen is 8mg / L, the data acquisition equipment installed in the sedimentation tank 1 transmits the collected total nitrogen and total phosphorus concentrations of the influent to the analysis and calculation layer in the linkage treatment system. The analysis and calculation layer comprehensively analyzes and processes the indicators collected by the on-site equipment and the pre-designed values ​​of the system, and generates a processing signal to send to the cloud management layer. The cloud management layer issues the command information to the pump station, valve, and fan control module of the analysis and calculation layer according to the program set by the system; the pump station, valve, The fan control module transmits control signals to start and close the water pump and the valves of each pipeline. The total nitrogen and total phosphorus concentrations of the inlet water are less than the preset values. In this case, the linkage treatment system instructs the inlet pump station 2 and the water pipeline valve control system to execute the standard water distribution mode. The standard water distribution mode means that the water distribution of channel one and channel two accounts for 40% and 60% of the total inlet water respectively. Under such circumstances, the micro-wetland process and its linkage treatment system involved in the present invention have a 25% to 35% higher total phosphorus removal rate than the traditional wetland process, a 20% to 30% higher total nitrogen removal rate, and a COD removal rate of more than 50%, which is more than 30% higher than the surface pollutant removal load of the traditional wetland.

[0035] Example 2

[0036] When the wetland influent is 40<Cod≤80mg / L, 2mg / L<total phosphorus, 2<total nitrogen≤8mg / L; the preset value of total phosphorus is 2mg / L, and the preset value of total nitrogen is 8mg / L, the data acquisition equipment installed in the sedimentation tank 1 transmits the collected total nitrogen and total phosphorus concentrations of the influent to the analysis and calculation layer in the linkage treatment system. The analysis and calculation layer comprehensively analyzes and processes the indicators collected by the on-site equipment and the pre-designed values ​​of the system, and generates a processing signal and sends it to the cloud management layer. The cloud management layer issues the command information to the pump station, valve, and fan control module of the analysis and calculation layer according to the program set by the system; the pump station, valve, and fan control module transmit control signals to start and close the water pump and the valves of each pipeline. The total phosphorus concentration of the influent exceeds the preset value. The set value and the total nitrogen concentration are less than the preset value. In this case, the linkage treatment system instructs the water inlet pump station 2 and the water pipeline valve control system to execute the channel one water distribution over-allocation mode. The channel one water distribution over-allocation mode means that the water distribution of channel one and channel two accounts for 55% and 45% of the total inlet water, respectively. In this case, because the total phosphorus in the inlet water exceeds the preset value, channel one is provided with a layer phosphorus removal unit 4, and the layer phosphorus removal unit 4 is provided with a phosphorus removal functional filler 42 to enhance the removal of total phosphorus in sewage. The micro-wetland process and its linkage treatment system involved in the present invention can increase the total phosphorus removal rate of channel one water distribution over-allocation mode by 12% to 18% compared with the standard water distribution mode, and the total nitrogen removal rate is basically the same (-2% to 1%), and the COD removal rate remains unchanged.

[0037] Example 3

[0038] When the wetland influent is 40<Cod≤80mg / L, 0.4<total phosphorus≤2mg / L, 8mg / L<total nitrogen; the preset value of total phosphorus is 2mg / L, and the preset value of total nitrogen is 8mg / L, the data acquisition equipment installed in the sedimentation tank 1 transmits the collected total nitrogen and total phosphorus concentrations of the influent to the analysis and calculation layer in the linkage treatment system. The analysis and calculation layer comprehensively analyzes and processes the indicators collected by the on-site equipment and the pre-designed values ​​of the system, and generates a processing signal to send to the cloud management layer. The cloud management layer issues the command information to the pump station, valve, and fan control module of the analysis and calculation layer according to the program set by the system; the pump station, valve, and fan control module transmit control signals to start and close the water pump and each pipeline Valve, the total nitrogen concentration of the inlet water exceeds the preset value and the total phosphorus concentration is less than the preset value. In this case, the linkage treatment system instructs the inlet pump station 2 and the water pipeline valve control system to execute the channel two water distribution over-allocation mode. The channel two water distribution over-allocation mode means that the water distribution of channel one and channel two accounts for 30% and 70% of the total inlet water respectively. In this case, because the total nitrogen in the inlet water exceeds the preset value, channel two is provided with a deep denitrification unit 6 to enhance the removal of total nitrogen in sewage, which can make the micro-wetland process and its linkage treatment system involved in the present invention channel two water distribution over-allocation mode increase the total nitrogen removal rate by 8% to 12% compared with the standard water distribution mode, and slightly reduce the total phosphorus removal rate by 2% to 3%, while the COD removal rate remains unchanged.

[0039] Example 4

[0040] When the wetland influent is 80mg / L<Cod, 2mg / L<total phosphorus, 8mg / L<total nitrogen; the total phosphorus is preset to 2mg / L, and the total nitrogen is preset to 8mg / L, the data acquisition equipment installed in the sedimentation tank 1 transmits the collected total nitrogen and total phosphorus concentrations of the influent to the analysis and calculation layer in the linkage treatment system. The analysis and calculation layer comprehensively analyzes and processes the indicators collected by the on-site equipment and the pre-designed values ​​of the system, and generates a processing signal to send to the cloud management layer. The cloud management layer issues the command information to the pump station, valve, and fan control module of the analysis and calculation layer according to the program set by the system; the pump station, valve, and fan control module The transmission control signal starts and closes the water pump and the valves of each pipeline. The total nitrogen and total phosphorus concentrations of the inlet water are less than the preset values. In this case, the linkage treatment system instructs the inlet pump station 2 and the water pipeline valve control system to execute the standard water distribution mode. The standard water distribution mode means that the water distribution of channel one and channel two accounts for 40% and 60% of the total inlet water respectively. Under such circumstances, the micro-wetland process and its linkage treatment system involved in the present invention have a 35% to 40% higher total phosphorus removal rate than traditional wetland processes, a 15% to 20% higher total nitrogen removal rate, and a COD removal rate of more than 55%, which is more than 32% higher than the comprehensive removal load of surface pollutants in traditional wetlands.

[0041] Example 5

[0042] On the basis of Examples 1-4, the wetland linkage treatment system sets the effluent COD, total nitrogen and total phosphorus indicators as the corresponding data of surface Class III water. After the micro-wetland influent is purified step by step, the data acquisition equipment in the stabilization pond 8 transmits the collected effluent water quality indicators to the analysis and calculation layer in the linkage treatment system. The analysis and calculation layer generates a processing signal after comprehensive analysis and processing of the indicators collected by the on-site equipment and the surface Class III water quality indicators set by the system. At this time, when the sewage treatment meets the surface Class III water requirements, the analysis and calculation layer generates a processing signal for standard discharge and sends it to the cloud management layer. The cloud management layer issues the command information to the pump station, valve, and fan control module of the analysis and calculation layer according to the program set by the system; the pump station, valve , the fan control module transmits a control signal to start the outlet pump and valve to execute drainage; when the sewage treatment does not meet the requirements of Class III surface water, the analysis and calculation layer generates a processing signal for standard discharge and sends it to the cloud management layer. The cloud management layer issues the instruction information to the pump station, valve, and fan control module of the analysis and calculation layer according to the program set by the system; the pump station, valve, and fan control module transmit a control signal to start the outlet pump and valve to execute the return of substandard water to the micro-wetland sedimentation tank 1, and according to the type of exceeded indicators and specific concentrations, in accordance with the implementation standards of Examples 1-4, the micro-wetland linkage treatment system coordinates and links channel 1 and channel 2 in the wetland process to execute the treatment task until the polluted water meets the discharge standards.

[0043] Through the above steps, the application limitation of traditional wetland technology, which occupies a large area, is solved by increasing the pollutant removal load on the wetland surface, and a micro-wetland with "small size and high energy" is created; the problem that traditional wetland fillers are easily blocked and cannot reach the designed operating life is solved by introducing rapid filtration devices and sponge purification systems; specific functional fillers are added to achieve directional and efficient treatment of specific pollutants; combined with the use of specific functional fillers, special functional units and multi-channel treatment systems are designed to achieve reasonable water distribution on demand; an intelligent linkage scheduling system is introduced to achieve water diversion, water outlet and return flow control through real-time data analysis and command transmission to solve the problem of large area and lack of linkage processing and scheduling capabilities between functional areas.

[0044] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A micro-wetland construction process, characterized in that: The steps are as follows: Step 1: In an area of ​​15000m 2 The following artificial wetland is provided with a sedimentation tank (1), an inlet pump station (2), a dual-channel treatment path, a root hole wetland + a surface flow wetland (7), a stabilization pond (8) and an outlet pump station (9) in sequence; the bottom of the sedimentation tank (1) is hardened and anti-seepage treated; the inlet pump station (2) includes a first outlet well and a first lifting pump, and the polluted water after sedimentation treatment flows into the dual-channel treatment path through the first lifting pump; Step 2: The dual-channel treatment path is divided into channel one and channel two; channel one includes a rapid filtration device (3) and a sheet phosphorus removal unit (4); channel two includes a sponge purification system (5) and a deep denitrification unit (6); The rapid filtering device (3) in the channel one comprises a pretreatment unit and a first main reaction unit; the pretreatment unit is provided with a large particle filter screen, and the first main reaction unit is provided with a porous light particle filter material; the bottom space of the rapid filtering device (3) is provided with a first mud collection layer; the rapid filtering device (3) rapidly filters the polluted water before it enters the wetland body, and efficiently filters and separates the suspended matter, algae and a small amount of colloidal substances in the polluted water, thereby alleviating the blockage of the wetland and rapidly reducing the COD of the polluted water body; the lamellar phosphorus removal unit (4) in the channel one is a flat rectangular gabion structure, and a phosphorus removal functional filler (42) and conventional graded granular material are arranged inside; the lamellar phosphorus removal unit (4) is arranged in a feather-like manner in the water body; the lamellar phosphorus removal unit (4) is immersed in water as a whole; The sponge purification system (5) in the second channel includes a microorganism screening and cultivation unit and a second main reaction unit; the microorganism screening and cultivation unit is provided with a biological rope, and the second main reaction unit is provided with a denitrification functional composite material; the bottom space of the sponge purification system (5) is provided with a second mud collection layer; the functional filler in the sponge purification system (5) can preliminarily purify pollutants in the water, and at the same time, when the polluted water flows through the microorganism carrier filler of the sponge purification system (5), it can carry functional bacteria to the subsequent process, thereby reducing the total nitrogen in the polluted water and assisting in improving the pollutant removal load on the wetland surface; the deep denitrification unit (6) in the second channel is a stepped subsurface wetland (62), and the stepped subsurface wetland (62) is provided with an autotrophic denitrification filler (61) and conventional graded granular materials; Step 3: Root hole wetland + surface flow wetland (7) includes root hole wetland and surface flow wetland; the root hole wetland is a semi-saturated flow wetland made of reed straw mixed with natural original soil; the bottom of the surface flow wetland is equipped with a submerged fan aeration system; Step 4: The stabilization pond (8) is planted with emergent, floating-leaf and submerged plants, and filter-feeding fish and benthic snails and clams are placed in the stabilization pond (8); phosphorus removal fillers are added to the bottom of the stabilization pond (8); the outlet pump station (9) includes a second outlet well and a second booster pump. After the polluted water is purified step by step in the micro-wetland, the water quality meets the standard and is discharged into the external water system through the second booster pump. If the water quality does not meet the standard, it is returned to the micro-wetland for further treatment through the second booster pump.

2. The micro-wetland construction process according to claim 1, characterized in that: The autotrophic denitrification filler (61) in the deep denitrification unit (6) is a sulfide-iron autotrophic filler.

3. The micro-wetland construction process according to claim 2, characterized in that: The volume ratio of reed straw to natural soil is 1:5, the diameter of reed straw is 0.3-1.2 cm, and the length is 0.5-1.2 m.

4. The micro-wetland construction process according to claim 3, characterized in that: The sedimentation tank (1), channel one, channel two, root hole wetland, surface flow wetland and stabilization pond (8) account for 4% to 6%, 15% to 20%, 10% to 15%, 0.8% to 1%, 35% to 42% and 18% to 20% of the total area of ​​the micro-wetland respectively.

5. Micro-wetland linkage treatment system, characterized by The micro-wetland construction process according to claim 4 further comprises a device layer, an analysis and computing layer, and a cloud management layer; The equipment layer includes operating equipment and data acquisition equipment, the operating equipment includes pumps, valves and fans; the data acquisition equipment includes a first water quality online monitor arranged in the sedimentation tank (1), a first flow acquisition equipment and a second flow acquisition equipment in the water inlet pump station (2), which are used to collect water inlet and water distribution data; A second water quality online monitoring instrument arranged in the stabilization pond (8) and a third flow rate collection device in the outlet pump station (9), for collecting outlet water data; The online dissolved oxygen meter installed in the surface flow wetland area is used to collect the dissolved oxygen content of the water body; the equipment layer is used to collect the water quality and water quantity data of the inlet and outlet water of the micro-wetland system, the dissolved oxygen content of the water body, and transmit the collected water body data to the analysis and calculation layer of the linkage processing system; The analysis and calculation layer includes a pump station, a valve, a fan control module and a data processing module; the analysis and calculation layer is used to receive the water quality, water volume and dissolved oxygen data transmitted by the equipment layer, analyze the data, generate corresponding processing signals, and send the processing signals to the cloud management layer of the linkage processing system; it is also used to receive the command information transmitted by the cloud management layer, and generate control signals according to the command information and send them to the micro-wetland inlet and outlet pump stations (9) and the water pipeline valve control system, and the submerged fan control system; the water inlet pump station (2) and the water pipeline valve control system control the water distribution volume of each channel of the micro-wetland based on the control signal; the water outlet pump station (9) and the water pipeline valve control system control the water outlet and return flow of the micro-wetland based on the control signal; the submerged fan control system controls the opening and closing of the aeration system based on the control signal. The cloud management layer includes a cloud processor and a communication module; it is used to receive processing signals sent by the analysis and computing layer and generate instruction information based on the processing signals.

6. The micro-wetland linkage treatment system according to claim 5 is characterized in that: The inlet water data includes the inlet water quality and water quantity. The inlet pump station (2) and the water pipeline valve control system control the water distribution volume of each channel of the micro-wetland based on the control signal: when the total phosphorus concentration of the inlet water quality is greater than a preset value and the total nitrogen concentration is less than a preset value, the inlet pump station (2) and the water pipeline valve control system start the micro-wetland channel first water distribution over-distribution mode to efficiently remove the total phosphorus in the water body; when the total nitrogen concentration of the inlet water quality is greater than a preset value and the total phosphorus concentration is less than a preset value, the inlet pump station (2) and The water pipeline valve control system starts the water distribution over-allocation mode of the micro-wetland channel 2 to efficiently remove the total nitrogen in the water body; when the total nitrogen and total phosphorus concentrations of the inlet water are both less than the preset values, the water inlet pump station (2) and the water pipeline valve control system start the standard water distribution mode; when the total nitrogen and total phosphorus concentrations of the inlet water are both greater than the preset values; the water inlet pump station (2) and the water pipeline valve control system start the water distribution over-allocation mode of the channel 2, and the phosphorus removal filler added to the bottom of the stabilization pond (8) assists in phosphorus removal to ensure the dual-effect removal of nitrogen and phosphorus.

7. The micro-wetland linkage treatment system according to claim 6 is characterized in that: The standard water distribution mode means that the water distribution of channel one and channel two accounts for 40% and 60% of the total water intake respectively; the over-allocation mode of channel one means that the water distribution of channel one and channel two accounts for 55% and 45% of the total water intake respectively; the over-allocation mode of channel two means that the water distribution of channel one and channel two accounts for 30% and 70% of the total water intake respectively.

8. The micro-wetland linkage treatment system according to claim 5 is characterized in that: The effluent data includes effluent water quality and water quantity. The effluent pump station (9) and the water pipeline gate valve control system control the effluent or return of the micro-wetland based on the control signal: when the effluent water quality meets the design requirements, the effluent pump station (9) completes the discharge up to standard according to the control signal; When the effluent quality does not meet the standard, the effluent pump station (9) returns the unqualified sewage to the sedimentation tank (1) according to the control signal, and the inlet pump station (2) performs dual-channel water distribution treatment on the unqualified sewage again according to the control signal and water quality conditions until it meets the standard.

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