Denitrification wetland system

Abstract

The utility model discloses a denitrification wetland system which comprises a primary treatment area, a first deep purification area, a denitrification functional area, a second deep purification area and a water outlet area which are sequentially communicated through water flow, and an overflow structure is arranged on the primary treatment area; after entering the primary treatment area, water flows into the first deep purification area in an overflow manner, the water flows to the denitrification function area after being purified by the first deep purification area, and the denitrification function area performs denitrification treatment on the water flow and adjusts the direction of the water flow, so that the water flow flows into the second deep purification area; after the water flow is purified again by the second deep purification area, the water flow flows into the water outlet area. By preventing a large amount of suspended matters and sediments from entering the wetland purification area, the wetland system is prevented from being blocked, and the purification efficiency of the wetland system is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a denitrification wetland system. Background Art

[0002] In recent years, with the continuous improvement of people's living standards, the discharge of urban sewage has also continued to increase. At present, environmental protection is increasingly valued, and sewage treatment plants are subject to stricter inspections and higher emission standards, which forces sewage treatment plants to improve their denitrification effects. Among the total nitrogen removal process options for urban sewage treatment plants, biological denitrification is currently the most economical and effective method. It mainly uses microorganisms to denitrify under anoxic conditions. Denitrifying bacteria use carbon sources as electron donors to reduce nitrate nitrogen and nitrite nitrogen in water into nitrogen gas to achieve the effect of denitrification.

[0003] As a typical ecological treatment technology, artificial wetlands mainly utilize the synergistic effect between matrix, microorganisms and plants to remove pollutants in sewage. At the same time, pollutants in sewage can promote plant growth and realize the resource utilization and harmlessness of sewage.

[0004] When sewage is currently treated through artificial wetlands, it is necessary to pre-treat the sewage to reduce the concentration of suspended matter and sediment in the sewage to avoid direct clogging of the wetland system. However, some suspended matter and sediment are not completely treated, and there are also suspended matter and sediment in the water pipeline. These suspended matter and sediment will enter the wetland. After a long time, the wetland will still be clogged, resulting in reduced purification efficiency. In addition, in artificial wetlands, since the flow rate of water in the wetlands is slow, the sediment and suspended matter in the sewage will settle everywhere, causing the artificial wetlands to be easily clogged, seriously affecting the purification efficiency of artificial wetlands for sewage, making it difficult to remove nitrates and nitrites in the water, resulting in eutrophication of water bodies and destruction of ecological balance, and destroying the artificial wetlands.

[0005] Therefore, how to provide a wetland system that is not prone to clogging and ensure the wetland's efficiency in purifying sewage is a technical problem that needs to be solved urgently. Utility Model Content

[0006] The utility model aims to propose a denitrification ecological wetland system to solve the problem that the existing artificial wetlands in the background technology are prone to blockage, seriously affecting the sewage purification efficiency, and even causing damage to the artificial wetlands and losing the purification function.

[0007] In order to achieve the above-mentioned purpose, the utility model proposes a denitrification wetland system, which includes a primary treatment area, a first deep purification area, a denitrification functional area, a second deep purification area, and a water outlet area, which are sequentially connected by water flow, and an overflow structure is provided on the primary treatment area; when the water flow enters the primary treatment area, it flows into the first deep purification area in an overflow manner, and the first deep purification area purifies the water quality and then flows to the denitrification functional area, and the denitrification functional area performs denitrification treatment on the water flow and adjusts the direction of the water flow so that the water flow flows into the second deep purification area, and after the second deep purification area purifies the water flow again, the water flow flows into the water outlet area.

[0008] Optionally, the water flow direction from the primary treatment area to the denitrification functional area is opposite to the water flow direction from the denitrification functional area to the outlet area; the sewage in the primary treatment area can directly flow into the outlet area through the overflow structure.

[0009] Optionally, a first porous adsorption filling layer is provided at the bottom of the primary treatment zone, and denitrifying bacteria are cultured in the primary treatment zone.

[0010] Optionally, a first buffer sedimentation zone is provided at a middle position of the primary treatment zone, and both sides of the first buffer sedimentation zone are slopes.

[0011] Optionally, the first deep purification zone and the second deep purification zone are divided into a plurality of wetland units along the vertical direction of the water flow by partition walls, and each adjacent wetland unit is connected in series, and each wetland unit is planted with first aquatic plants.

[0012] Optionally, the water depth between adjacent wetland units is set in steps; the water depth in the multiple wetland units in the first deep purification zone gradually increases from the primary treatment area to the denitrification functional area; the water depth in the multiple wetland units in the second deep purification zone gradually increases from the denitrification functional area to the outlet area.

[0013] Optionally, the denitrification functional zone includes a second buffer sedimentation zone connected to the first deep purification zone, a denitrification purification zone connected to the second buffer sedimentation zone, and a transition connection zone connecting the denitrification purification zone and the second deep purification zone.

[0014] Optionally, the second buffer sedimentation zone and the transition connection zone are combined to form an annular structure, the denitrification purification zone is located at the center of the annular structure, and the denitrification purification zone is provided with a water inlet and a water outlet, the water inlet is connected to the second buffer sedimentation zone, and the water outlet is connected to the transition connection zone.

[0015] Optionally, the water depth in the second buffer sedimentation zone is greater than the water depth in the denitrification purification zone, and the denitrification functional zone is arranged in a circular shape; the water inlet and the water outlet divide the edge of the denitrification purification zone into an inferior arc and a superior arc.

[0016] Optionally, a plurality of water blocking plates and a partition plate are provided in the denitrification functional area, and the plurality of water blocking plates and the partition plate divide the denitrification functional area into equal angles; a water flow trough is provided on the partition plate; the partition plate is located on the inferior arc at the edge of the denitrification purification area; the water blocking plate is located on the superior arc at the edge of the denitrification purification area; and a second aquatic plant is planted in the denitrification functional area.

[0017] Optionally, the overflow structure is an overflow trough arranged on the side of the primary treatment area, and the overflow trough is arranged at a position higher than the water level of the water outlet area.

[0018] Compared with the prior art, the utility model provides a denitrification wetland system with the following beneficial effects:

[0019] The denitrification wetland system sets a primary treatment area in the wetland system to precipitate suspended matter and sediment in the sewage again, thereby preventing a large amount of suspended matter and sediment from entering the wetland purification area and clogging the wetland system, thereby ensuring the purification efficiency of the wetland system. The suspended matter and sediment are helpful for the growth and development of denitrifying bacteria, and the sewage is denitrified. The first deep purification area and the second deep purification area purify the sewage multiple times, and the denitrification functional area denitrifies the sewage again, thereby ensuring that the sewage is treated completely and meets national emission standards.

[0020] In addition, the present application sets up an overflow structure. When the amount of sewage entering exceeds the purification limit of the wetland system, the sewage will be directly discharged into the outlet area through the overflow structure, avoiding damage to the wetland system due to excessive sewage treatment volume. Since the water in the outlet area is unpurified water, the sewage can be diluted, which can avoid damage to the current artificial wetland while reducing the difficulty of subsequent sewage treatment processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the denitrification wetland system of the utility model.

[0022] Figure 2 It is a cross-sectional view of the primary processing area of ​​the utility model.

[0023] Figure 3 It is a side view of the first deep purification zone of the utility model.

[0024] Figure 4 It is a side view of the second deep purification zone of the utility model.

[0025] Figure 5 It is an enlarged schematic diagram of the denitrification functional area of ​​the utility model.

[0026] Figure 6It is a cross-sectional view of the treatment area and the water outlet area of ​​the utility model.

[0027] Markings in the figure: 1. Primary treatment area; 11. First porous adsorption filling layer; 12. First buffer sedimentation area; 13. Slope; 2. First deep purification area; 3. Denitrification functional area; 31. Second buffer sedimentation area; 32. Denitrification purification area; 321. Water inlet; 322. Water outlet; 323. Water blocking plate; 324. Dividing plate; 325. Water trough; 33. Transition connection area; 4. Second deep purification area; 5. Water outlet area; 6. Overflow structure; 61. Overflow trough; 7. Wetland unit; 71. First aquatic plant. DETAILED DESCRIPTION

[0028] The following is a detailed description in conjunction with the accompanying drawings and specific implementations. In the following description, many specific details are set forth to facilitate a full understanding of the present utility. However, the present utility can be implemented in many other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present utility, so the present utility is not limited by the specific embodiments disclosed below.

[0029] A denitrification wetland system of the present application can be used in occasions such as sewage purification and treatment, and of course can also be used in other similar application scenarios. A denitrification wetland system is described in detail below.

[0030] See attached Figure 1 — Figure 6 As shown, a schematic diagram of the structure of a preferred embodiment of a denitrification wetland system of the present application is shown. The denitrification wetland system comprises a primary treatment area 1, a first deep purification area 2, a denitrification functional area 3, a second deep purification area 4, and a water outlet area 5, which are arranged in sequence along the water flow direction, wherein an overflow structure 6 is provided on the primary treatment area 1. It should be noted that the primary treatment area 1 is used for precipitating suspended matter and sediment in the sewage and preliminary denitrification purification; the first deep purification area 2 is used for physical filtration and biodegradation of sewage, decomposing organic matter in sewage and purifying sewage; the denitrification functional area 3 is used for denitrification purification of sewage and further purification of sewage; the second deep purification area 4 is used for physical filtration and biodegradation of sewage again to ensure that organic matter in the water is decomposed and meets the discharge standards; through the setting of the outlet area 5, the purified water is subjected to sedimentation treatment again to ensure that suspended matter and sediment in the water are completely precipitated and meet the discharge standards; the water flow direction from the primary treatment area 1 to the denitrification functional area 3 is opposite to the water flow direction from the denitrification functional area 3 to the outlet area 5.

[0031] The utility model sets a primary treatment area 1. Before the sewage enters the first deep purification area 2, the pre-treated sewage is first precipitated again, and the suspended matter and sediment in the sewage are precipitated again to prevent a large amount of suspended matter and sediment from directly flowing into the purification area, thereby avoiding clogging of the purification area. In addition, the utility model fills the primary treatment area 1 with a first porous adsorption filling layer 11 through porous adsorption material, and cultivates anaerobic denitrifying bacteria. While the suspended matter and sediment of the sewage are precipitated, the sewage is subjected to preliminary denitrification treatment. The porous adsorption material, anaerobic denitrifying bacteria and sediment complement each other to enhance the denitrification purification capacity of the sewage. Specifically, the porous structure inside the porous adsorption material can provide a habitat and attachment points for the anaerobic denitrifying bacteria, so that the surface and inner surface of the porous adsorption material can be The pores of the porous adsorption material form a tight combination with the anaerobic denitrifying bacteria, and the high porosity and surface area of ​​the porous adsorption material enable it to adsorb more anaerobic denitrifying bacteria, thereby enhancing biological activity, which helps to accelerate the denitrification reaction process and improve the nitrogen removal efficiency. The primary treatment zone 1 precipitates suspended matter and sediments to make the environment in the primary treatment zone 1 anoxic or hypoxic state, and anaerobic denitrifying bacteria are facultative anaerobic bacteria that can survive and denitrify under anaerobic conditions. Sediments and suspended matter usually contain rich organic matter, which can serve as energy sources and carbon sources for anaerobic denitrifying bacteria and support their growth and metabolic activities. Therefore, the primary treatment zone 1 precipitates suspended matter and sediments, which complements the anaerobic denitrifying bacteria and the porous adsorption material to enhance the denitrification of sewage.

[0032] The utility model, through the setting of the first deep purification zone 2 and the second deep purification zone 4, consumes and removes nutrients and organic matter in the sewage for multiple times, ensures that the nutrients and organic matter content in the sewage meets the national discharge standards, and controls the flow rate of the water flow in the purification zone to avoid the slow flow of the water flow, which causes the suspended matter and the sediment to be precipitated at the same position, and controls the water flow to ensure the purification efficiency of the sewage; by setting the denitrification functional zone 3 between the first deep purification zone 2 and the second deep purification zone 4, each treatment process is carried out under its optimal conditions, that is, the types of microorganisms required in the denitrification functional zone and the purification zone are different, and if the denitrification treatment and the decomposition of organic matter are carried out at the same time, there may be competition between the organic matter and the electron donor, thereby affecting the treatment effects of both. The application sets the denitrification functional zone and the two purification zones at intervals to reduce such competition and interference, and ensure that each treatment process can obtain sufficient electron donors and other necessary resources.

[0033] The utility model performs a second denitrification treatment on the sewage by setting up the denitrification functional area 3, so as to ensure that the nitrate and nitrite content in the sewage is reduced to meet the national discharge standard; in addition, the denitrification functional area 3 adjusts the direction and flow rate of the water flow, and performs multiple deep purifications on the sewage within a limited wetland area, and provides the necessary conditions for the primary treatment area 1 to be connected with the water outlet area 5 through the overflow structure 6, so that there is no need to connect through complex pipes, thereby reducing the cost of wetland construction.

[0034] The utility model sets an overflow structure 6 in conjunction with the outlet area 5. When the amount of sewage temporarily entering is too large, the sewage will flow directly into the outlet area 5 through the overflow structure 6, thereby protecting the subsequent purification area and denitrification functional area 3 of the wetland, preventing the amount of sewage entering from exceeding the sewage treatment capacity of the wetland, causing damage to the wetland, thereby protecting the wetland. After the treated water in the outlet area 5 is mixed with the sewage, the sewage can be diluted to avoid the need for manual water volume control. A water quality monitoring system is set in the outlet area 5. When the water quality does not meet the discharge standard, manual intervention is performed, for example, closing the sewage discharge pipe and the outlet pipe, and sucking the outlet pipe through a temporary suction device to the primary treatment area 1 for re-purification. It should be particularly noted that the overflow structure 6 is only suitable for temporary and short-term overload sewage discharge, and is not suitable for long-term operation.

[0035] It should be specially noted that the denitrification of sewage by plants and anaerobic denitrifying bacteria in this application is a prior art and will not be elaborated in this application.

[0036] See attached Figure 1 and Figure 2 As shown, in the present invention, a first buffer sedimentation area 12 is provided in the middle of the primary treatment area 1, and both sides of the first buffer sedimentation area 12 are slopes 13. The present invention can limit the accumulation position of suspended matter and sediment through the provision of the first buffer sedimentation area 12, in combination with the slopes 13, to facilitate subsequent cleaning.

[0037] See attached Figure 1 , Figure 3 and Figure 4As shown, in the present invention, the first deep purification zone 2 and the second deep purification zone 4 are divided into a plurality of wetland units 7 along the vertical direction of the water flow by partition walls, and each adjacent wetland unit 7 is connected in series, and each wetland unit 7 is planted with a first aquatic plant 71. It should be particularly noted that the water depth between adjacent wetland units 7 is arranged in a stepped manner. Specifically, the water depth in the plurality of wetland units 7 in the first deep purification zone 2 gradually increases from the primary treatment zone 1 to the denitrification functional zone 3, that is, the water depth of the wetland unit 7 closest to the primary treatment zone 1 is the shallowest among all the wetland units 7 in the first deep purification zone 2, and the wetland unit 7 farthest from the primary treatment zone 1 in the first deep purification zone 2 has the deepest water depth; the water depth in the plurality of wetland units 7 in the second deep purification zone 4 gradually increases from the denitrification functional zone 3 to the water outlet zone 5.

[0038] The utility model divides two purification areas into a plurality of wetland units 7 by a partition wall, and gradually increases the water depth of the wetland unit 7 to accelerate the flow rate, thereby improving the purification efficiency and ensuring that the sewage flows in the wetland for purification; through the provision of the first aquatic plant 71, the wetland can be beautified while purifying the sewage. Specifically, the first aquatic plant 71 can be aquatic canna, variegated reed, lily of the valley, pickerel grass and other plants. Different aquatic plants can be planted in different wetland units 7 according to different water depths. The aquatic plants planted in the purification area can biodegrade and physically degrade the sewage and purify the water quality.

[0039] See attached Figure 1 and Figure 5 As shown, in the utility model, the denitrification functional area 3 includes a second buffer sedimentation area 31 connected to the first deep purification area 2, a denitrification purification area 32 connected to the second buffer sedimentation area 31, and a transition connection area 33 connecting the denitrification purification area 32 and the second deep purification area 4; it should be particularly noted that the second buffer sedimentation area 31 and the transition connection area 33 are surrounded by a ring structure, the denitrification purification area 32 is located at the center of the ring structure, and the denitrification purification area 32 is provided with a water inlet 321 and a water outlet 322, the water inlet 321 is connected to the second buffer sedimentation area 31, and the water outlet 322 is connected to the transition connection area 33.

[0040] The utility model re-precipitates the sewage passing through the first deep purification zone 2 by setting the second buffer sedimentation zone 31, further dilutes the content of suspended matter and sediment in the sewage, slows down the flow rate of sewage, prolongs the time for sewage denitrification, improves the purification effect, prepares for the subsequent denitrification purification zone 32, and ensures the denitrification effect of the denitrification purification zone 32. Since the second buffer sedimentation zone 31 slows down the flow rate of sewage, suspended matter and sediment are easy to settle, and the denitrification purification zone 32 is to precipitate nitrates and nitrites in the sewage through porous adsorption materials and plants. If there are a large number of suspended matter and sediment in the sewage, it is easy to hinder the optical fiber and affect the growth of plants. The precipitation of suspended matter and sediment will cover or block the plant root system and affect the absorption of the plant root system. Therefore, it is necessary to provide a second buffer sedimentation zone 31 to provide a sedimentation position for suspended matter and sediment to prevent subsequent sedimentation. Under the premise of the same denitrification time, slowing down the flow rate of sewage can reduce the journey of sewage in the denitrification purification zone 32 and reduce the area of ​​the denitrification purification zone 32.

[0041] See attached Figure 5 As shown, in the present invention, the water depth at the second buffer sedimentation area 31 is greater than the water depth at the denitrification purification area 32, and the denitrification purification area 32 is arranged in a circular shape; the water inlet 321 and the water outlet 322 divide the edge of the denitrification purification area 32 into a minor arc and a major arc. It should be particularly noted that a plurality of water blocking plates 323 and a partition plate 324 are arranged in the denitrification purification area 32, and the plurality of water blocking plates 323 and a partition plate 324 divide the denitrification purification area 32 into equal angles; a water trough 325 is arranged on the partition plate 324; the partition plate 324 is located on the minor arc at the edge of the denitrification purification area 32; the water blocking plate 323 is located on the major arc at the edge of the denitrification purification area 32; and a second aquatic plant is planted in the denitrification purification area 32.

[0042] The utility model forms an annular structure by enclosing the second buffer sedimentation area 31 and the denitrification purification area 32, so that when the second buffer sedimentation area 31 decelerates the sewage, it adopts an arc-shaped structure to guide and decelerate, rather than adopting a way of blocking the water flow to decelerate, thereby effectively avoiding the suspended matter and sediment from surging again and affecting the sedimentation effect due to the sudden obstruction of the water flow; through the arrangement of the water inlet 321 and the water outlet 322, it is ensured that the water flow can flow smoothly. It should be particularly noted that the position of the water inlet 321 is not located at the end of the second buffer sedimentation area 31, but there is a certain distance from the end of the second buffer sedimentation area 31, in order to avoid the water flow being blocked by the end. The surging sediment and suspended matter enter the denitrification purification zone 32; the partition plate 324 is set to prevent the water entering the denitrification purification zone 32 from the water inlet 321 from directly flowing out from the water outlet 322, and the water blocking plate 323 is set to extend the journey of the sewage in the denitrification purification zone 32 to ensure the purification effect of the sewage; the second aquatic plants are planted and the microorganisms are used to denitrify the sewage. The second aquatic plants can be aquatic canna, lily, pickerel grass, iris, and front gourd. The direction of the water flow is changed by the cooperation of the second buffer sedimentation zone 31, the denitrification purification zone 32 and the transition connection zone 33, so that the water flows toward the outlet zone 5.

[0043] See attached Figure 2 and Figure 6 As shown, in the present invention, the overflow structure 6 is an overflow trough 61 arranged on the side of the primary treatment area 1 , and the setting position of the overflow trough 61 is higher than the water level of the water outlet area 5 .

[0044] The utility model sets an overflow trough 61 to limit the water level of the water outlet area 5. After the amount of sewage entering exceeds the maximum treatment capacity of the wetland, the sewage will enter the water outlet area 5 through the overflow trough 61 to be diluted. A water quality detection device can be set in the water outlet area 5 to monitor the water quality of the water outlet area 5 to avoid a large amount of sewage being directly discharged into the water outlet area 5, causing the water outlet area 5 to be polluted and unable to be discharged.

[0045] See attached Figure 1 — Figure 6 As shown, the utility model purifies and denitrifies sewage as follows:

[0046] First, the pretreated sewage is discharged into the primary treatment area 1, and the suspended matter and sediment are first settled in the primary treatment area 1, and the first denitrification purification is carried out at the same time. Then, it flows into the wetland unit 7 with the shallowest water depth in the first deep purification area 2 by overflow. Then, the water flows through other wetland units 7 in the first deep purification area 2 in turn, and the sewage is biodegraded and physically filtered. Then, the suspended matter and sediment in the sewage are settled again through the second buffer sedimentation area 31 in the denitrification functional area 3. Then, the sewage flows into the denitrification purification area 32 for the second denitrification purification, and then flows into the second deep purification area 4 through the transition connection area 33 for the second biological degradation and physical filtration, and finally discharged through the outlet area 5.

[0047] The above embodiments are intended to illustrate the present application, not to limit the present application. Any solution that is a simple transformation of the present application falls within the protection scope of the present application.

Claims

1. A denitrification wetland system, characterized in that: It comprises a primary treatment area (1), a first deep purification area (2), a denitrification functional area (3), a second deep purification area (4), and a water outlet area (5) which are sequentially connected by water flow, and an overflow structure (6) is provided on the primary treatment area (1); After the water flows into the primary treatment area (1), it flows into the first deep purification area (2) in an overflow manner. After the first deep purification area (2) purifies the water, it flows to the denitrification functional area (3). The denitrification functional area (3) performs denitrification treatment on the water and adjusts the direction of the water flow so that the water flows into the second deep purification area (4). After the second deep purification area (4) purifies the water again, the water flows into the water outlet area (5); The direction of water flow from the primary treatment area (1) to the denitrification functional area (3) is opposite to the direction of water flow from the denitrification functional area (3) to the effluent area (5); The sewage in the primary treatment area (1) can flow directly into the water outlet area (5) through the overflow structure (6).

2. The denitrification wetland system according to claim 1, characterized in that: A first porous adsorption filling layer (11) is provided at the bottom of the primary treatment area (1), and denitrifying bacteria are cultured in the primary treatment area (1).

3. The denitrification wetland system according to claim 2, characterized in that: A first buffer sedimentation zone (12) is provided at the middle position of the primary treatment zone (1), and both sides of the first buffer sedimentation zone (12) are slopes (13).

4. The denitrification wetland system according to claim 1, characterized in that: The first deep purification area (2) and the second deep purification area (4) are divided into a plurality of wetland units (7) along the vertical direction of the water flow by partition walls, and each adjacent wetland unit (7) is connected in series with each other, and each wetland unit (7) is planted with a first aquatic plant (71).

5. The denitrification wetland system according to claim 4, characterized in that: The water depth between adjacent wetland units (7) is set in steps; The water depth in the plurality of wetland units (7) in the first deep purification zone (2) gradually increases from the primary treatment zone (1) to the denitrification functional zone (3); The water depth in the plurality of wetland units (7) in the second deep purification zone (4) gradually increases from the denitrification functional zone (3) to the water outlet zone (5).

6. The denitrification wetland system according to claim 1, characterized in that: The denitrification functional zone (3) comprises a second buffer sedimentation zone (31) connected to the first deep purification zone (2), a denitrification purification zone (32) connected to the second buffer sedimentation zone (31), and a transition connection zone (33) connecting the denitrification purification zone (32) and the second deep purification zone (4).

7. The denitrification wetland system according to claim 6, characterized in that: The second buffer sedimentation zone (31) and the transition connection zone (33) are combined to form an annular structure, the denitrification purification zone (32) is located at the center of the annular structure, and the denitrification purification zone (32) is provided with a water inlet (321) and a water outlet (322), the water inlet (321) is connected to the second buffer sedimentation zone (31), and the water outlet (322) is connected to the transition connection zone (33).

8. The denitrification wetland system according to claim 7, characterized in that: The water depth in the second buffer sedimentation zone (31) is greater than the water depth in the denitrification purification zone (32), and the denitrification purification zone (32) is arranged in a circular shape; The water inlet (321) and the water outlet (322) divide the edge of the denitrification purification area (32) into an inferior arc and a superior arc.

9. The denitrification wetland system according to claim 8, characterized in that: The denitrification purification area (32) is provided with a plurality of water blocking plates (323) and a partition plate (324), and the plurality of water blocking plates (323) and the partition plate (324) divide the denitrification purification area (32) into equal angles; The partition plate (324) is provided with a water channel (325); The partition plate (324) is located on the inferior arc at the edge of the denitrification purification zone (32); the water blocking plate (323) is located on the superior arc at the edge of the denitrification purification zone (32); A second aquatic plant is planted in the denitrification purification area (32).

10. The denitrification wetland system according to claim 1, characterized in that: The overflow structure (6) is an overflow trough (61) arranged on the side of the primary treatment area (1), and the overflow trough (61) is arranged at a position higher than the water level of the water outlet area (5).

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