An anaerobic deep vertical subsurface flow wetland

Abstract

The application relates to a deep vertical subsurface flow wetland capable of preventing anaerobiosis and relates to the technical field of sewage treatment. The wetland pool body is internally sequentially provided with a plant system, a filler layer and a microbial community from top to bottom; a second water inlet is arranged on the upper side wall of one side of the wetland pool body; a water outlet is arranged on the lower side wall of the other side of the wetland pool body; a plurality of air permeable pipes are arranged in the wetland pool body; the air permeable pipes all penetrate the plant system, the filler layer and the microbial community; the top end of the air permeable pipe penetrates the plant system; and the top end of the air permeable pipe is provided with an air permeable air cap. The application has the effects of reducing the anaerobic environment of the vertical subsurface flow wetland, improving the depth of the vertical subsurface flow wetland and improving the efficiency of the vertical subsurface flow wetland.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a deep vertical subsurface flow wetland for preventing anaerobic conditions. Background Technology

[0002] Since its successful development, vertical subsurface flow wetlands have formed a standardized application system globally. Their core advantage lies in the vertical subsurface flow design, which allows wastewater to penetrate multiple layers of media from top to bottom, completing pollutant degradation through the synergistic action of plant roots and microorganisms. Compared to traditional surface flow wetlands, this technology has advantages such as smaller footprint, higher treatment efficiency, and stronger resistance to shock loads, making it particularly suitable for urban wastewater deep treatment, rural non-point source pollution control, and landscape water body restoration. However, existing vertical subsurface flow wetlands suffer from excessive depth, leading to the formation of an anaerobic environment, which affects microbial activity, alters pollutant transformation pathways, and disrupts system structural stability. Therefore, this application provides a deep vertical subsurface flow wetland that prevents anaerobic conditions. Utility Model Content

[0003] In order to reduce the anaerobic environment of vertical subsurface flow wetlands and increase the depth of vertical subsurface flow wetlands, thereby improving the efficiency of vertical subsurface flow wetlands, this application provides a deep vertical subsurface flow wetland that prevents anaerobic conditions.

[0004] The technical solution for preventing anaerobic deep vertical subsurface flow wetlands provided in this application is as follows: A deep vertical subsurface flow wetland for preventing anaerobic conditions includes a wetland pool. From top to bottom, a plant system, a packing layer, and a microbial community are arranged within the wetland pool. A second inlet is located on the upper sidewall of one side of the wetland pool, and an outlet is located on the lower sidewall of the other side. Several ventilated pipes are installed within the wetland pool, all of which penetrate the plant system, the packing layer, and the microbial community. The top of each ventilated pipe passes through the plant system and is fitted with a ventilated cap.

[0005] By adopting the above technical solution, this application can achieve air circulation at the bottom of the wetland pool by setting up vent pipes and vent caps, thereby preventing the formation of an anaerobic environment inside the wetland pool, increasing the depth of the vertical subsurface flow wetland, and thus improving the efficiency of the vertical subsurface flow wetland.

[0006] Preferably, a sedimentation tank is provided on the side wall of the wetland pool where the second water inlet is located, the sedimentation tank is connected to the second water inlet, and a first water inlet is provided on the inner wall of the sedimentation tank away from the second water inlet.

[0007] By adopting the above technical solution, the sedimentation tank can settle pollutants before the sewage enters the wetland tank, thereby reducing the risk of blockage in the packing layer and reducing the stagnation of water flow caused by blockage, which in turn leads to anaerobic problems.

[0008] Preferably, a filter screen is provided inside the first water inlet.

[0009] By adopting the above technical solution, the filter screen can initially filter large particulate impurities in the sewage entering the sedimentation tank through the first inlet, thereby saving the sedimentation time spent in the sedimentation tank and improving sewage treatment efficiency.

[0010] Preferably, the wetland pool is also equipped with a backwashing system.

[0011] By adopting the above technical solution, the backwashing system can periodically flush the packing layer, restore its permeability, and prevent the packing layer from becoming clogged and forming an anaerobic environment.

[0012] Preferably, the backwashing system includes a high-pressure water gun and a backwashing pump. The high-pressure water gun is installed on the inner wall of the wetland pool, and the high-pressure water gun is connected to the backwashing pump, which is connected to an external water source.

[0013] By adopting the above technical solutions, high-pressure water guns and backwash pumps can flush the packing layer, restore its permeability, and prevent the packing layer from becoming clogged and forming an anaerobic environment.

[0014] Preferably, the inner wall of the wetland pool is provided with an impermeable membrane.

[0015] By adopting the above technical solutions and installing an impermeable membrane, the sealing performance of the wetland pond can be effectively improved, the probability of sewage seeping out from the inner wall of the wetland pond can be reduced, and the safety of vertical subsurface flow wetlands can be improved.

[0016] Preferably, the bottom wall of the wetland pool is provided with an impermeable layer, which includes clay and bentonite pad.

[0017] By adopting the above technical solution, the impermeable layer can prevent sewage from seeping in and polluting the groundwater system.

[0018] Preferably, the packing layer includes an upper packing layer, a middle packing layer, and a lower packing layer arranged sequentially from top to bottom. The upper packing layer is made of coarse sand, the middle packing layer is made of ceramsite, and the lower packing layer is made of steel slag.

[0019] By adopting the above technical solution, the upper layer of packing material, made of coarse sand, can filter suspended solids in wastewater; the middle layer of packing material, made of ceramsite, can adsorb pollutants in wastewater; and the lower layer of packing material, made of steel slag, can promote the precipitation of phosphorus in wastewater. The layered design optimizes the removal path of pollutants in wastewater and avoids the generation of an anaerobic environment caused by packing blockage.

[0020] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up vent pipes and vent caps, this application can realize air circulation at the bottom of the wetland pool, thereby preventing the formation of an anaerobic environment inside the wetland pool, thus increasing the depth of the vertical subsurface flow wetland and improving its efficiency. 2. Setting up a sedimentation tank allows pollutants to settle before sewage enters the wetland tank, reducing the risk of blockage in the packing layer and thus reducing water flow stagnation caused by blockage, which in turn leads to anaerobic problems. 3. The backwashing system can periodically flush the packing layer to restore its permeability and prevent the packing layer from becoming clogged and forming an anaerobic environment; 4. The upper layer of packing material uses coarse sand to filter suspended solids in the wastewater, the middle layer of packing material uses ceramsite to adsorb pollutants in the wastewater, and the lower layer of packing material uses steel slag to promote the precipitation of phosphorus in the wastewater. The layered design optimizes the removal path of pollutants in the wastewater and avoids the generation of an anaerobic environment caused by packing blockage. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a deep vertical subsurface flow wetland for preventing anaerobic conditions, according to an embodiment of this application.

[0022] Figure 2 This is an embodiment of the present application. Figure 1 A magnified view of a portion of point A in the middle.

[0023] Explanation of reference numerals in the attached diagram: 1. Wetland pool body; 11. Second inlet; 12. Outlet; 2. Plant system; 3. Packing layer; 31. Upper packing layer; 32. Middle packing layer; 33. Lower packing layer; 4. Microbial community; 5. Ventilation pipe; 51. Ventilation cap; 6. Sedimentation tank; 61. First inlet; 62. Filter screen; 7. Backwashing system; 71. High-pressure water gun; 72. Backwashing pump; 8. Impermeable membrane; 9. Impermeable layer. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0025] This application discloses a deep vertical subsurface flow wetland for preventing anaerobic conditions. (Refer to...) Figure 1 and Figure 2The wetland pool 1 includes a sedimentation tank 6 on one side of the outer wall of the wetland pool 1. A first inlet 61 is provided on the lower side wall of the sedimentation tank 6 away from the wetland pool 1. A filter grid 62 is provided in the first inlet 61 to filter large particulate suspended solids in the sewage, so as to reduce the burden of subsequent sewage treatment on the wetland pool 1.

[0026] Reference Figure 1 and Figure 2 A second inlet 11 is provided on the upper side wall of the wetland pool 1. The second inlet 11 is used to connect the sedimentation tank 6 and the wetland pool 1. An outlet 12 is provided on the lower side wall of the wetland pool 1 away from the second inlet 11 for discharging the treated water. An impermeable membrane 8 is provided on the inner wall of the wetland pool 1 to prevent sewage from seeping through the inner wall of the wetland pool 1 and polluting land resources. In this embodiment, the impermeable membrane 8 is made of HDPE membrane.

[0027] Reference Figure 1 and Figure 2 The wetland pool 1 is arranged from top to bottom as follows: a plant system 2, a packing layer 3, and a microbial community 4. In this embodiment, the packing layer 3 includes an upper packing layer 31, a middle packing layer 32, and a lower packing layer 33 arranged from top to bottom. The upper packing layer 31 is made of coarse sand to filter suspended solids in the sewage, the middle packing layer 32 is made of ceramsite to adsorb pollutants in the sewage, and the lower packing layer 33 is made of steel slag to promote the precipitation of phosphorus in the sewage. The packing layer 3 of this application adopts a layered design, which optimizes the removal path of pollutants in the sewage and avoids the generation of an anaerobic environment caused by packing blockage.

[0028] Reference Figure 1 and Figure 2 Several air vents 5 are installed inside the wetland pool 1. The air vents 5 are vertically installed through the plant system 2, the filler layer 3 and the microbial community 4. The top of the air vents 5 extends out of the plant system 2. An air vent cap 51 is installed at the end of the air vents 5 that extends out of the plant system 2. By setting the air vents 5 and the air vent cap 51, air circulation at the bottom of the wetland pool 1 can be achieved, thereby preventing the formation of an anaerobic environment inside the wetland pool 1, thereby increasing the depth of the vertical subsurface flow wetland and thus improving the efficiency of the vertical subsurface flow wetland.

[0029] Reference Figure 1 and Figure 2 The inner wall of the wetland pool 1 is equipped with a backwashing system 7, which includes a high-pressure water gun 71 and a backwashing pump 72. The high-pressure water gun 71 is installed on the inner wall of the wetland pool 1 and is connected to the backwashing pump 72. The backwashing pump 72 is connected to an external water source, so that the packing layer 3 can be flushed regularly to restore its permeability and prevent the packing layer 3 from being blocked and forming an anaerobic environment.

[0030] Reference Figure 1 and Figure 2 The bottom wall of the wetland pool 1 is provided with an impermeable layer 9. In this embodiment, the impermeable layer 9 includes clay and bentonite pad. The impermeable layer 9 can prevent sewage from seeping in and polluting the groundwater system.

[0031] The implementation principle of a deep vertical subsurface flow wetland for preventing anaerobic conditions in this application embodiment is as follows: By setting up a vent pipe 5 and a vent cap 51, this application can achieve air circulation at the bottom of the wetland pool 1, thereby preventing the generation of an anaerobic environment inside the wetland pool 1, thus increasing the depth of the vertical subsurface flow wetland and improving its efficiency; In addition, this application also improves the problem of anaerobic environment caused by easy clogging of the packing layer 3 by setting up a layered design of the packing layer 3, adding a pretreatment unit (sedimentation tank 6 and filter grid 62), and adding a backwashing system 7.

[0032] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A deep vertical subsurface flow wetland for preventing anaerobic conditions, characterized in that: The wetland includes a wetland pool, in which a plant system, a packing layer, and a microbial community are arranged sequentially from top to bottom. A second water inlet is provided on the upper side wall of one side of the wetland pool, and a water outlet is provided on the lower side wall of the other side of the wetland pool. Several ventilating pipes are arranged in the wetland pool, and all of the ventilating pipes pass through the plant system, the packing layer, and the microbial community. The top of each ventilating pipe passes through the plant system and is equipped with a ventilating cap.

2. A deep vertical subsurface flow wetland for preventing anaerobic conditions according to claim 1, characterized in that: A sedimentation tank is provided on the side wall of the wetland pool where the second water inlet is located. The sedimentation tank is connected to the second water inlet. A first water inlet is provided on the inner wall of the sedimentation tank away from the second water inlet.

3. A deep vertical subsurface flow wetland for preventing anaerobic conditions according to claim 2, characterized in that: A filter screen is installed inside the first water inlet.

4. A deep vertical subsurface flow wetland for preventing anaerobic conditions according to claim 1, characterized in that: The wetland pool is also equipped with a backwashing system.

5. A deep vertical subsurface flow wetland for preventing anaerobic conditions according to claim 4, characterized in that: The backwashing system includes a high-pressure water gun and a backwashing pump. The high-pressure water gun is installed on the inner wall of the wetland pool and is connected to the backwashing pump, which is connected to an external water source.

6. A deep vertical subsurface flow wetland for preventing anaerobic conditions according to claim 1, characterized in that: The inner wall of the wetland pool is equipped with a seepage-proof membrane.

7. A deep vertical subsurface flow wetland for preventing anaerobic conditions according to claim 1, characterized in that: The bottom wall of the wetland pool is provided with an impermeable layer, which includes clay and bentonite padding.

8. A deep vertical subsurface flow wetland for preventing anaerobic conditions according to claim 1, characterized in that: The packing layer includes an upper packing layer, a middle packing layer, and a lower packing layer arranged sequentially from top to bottom. The upper packing layer is made of coarse sand, the middle packing layer is made of ceramsite, and the lower packing layer is made of steel slag.

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