Subsurface wetland structure capable of realizing local self-backwashing

Abstract

The utility model discloses a partial self-backwashing subsurface wetland structure and belongs to the technical field of subsurface wetlands. The device comprises a water inlet channel, a filler area and a drainage channel, the water inlet channel is located at the front section of the wetland, and the water inlet channel is connected with the filler area through a water inlet pipe and supplies water to the filler area; the packing area is equally divided into a plurality of sub-packing areas; each sub-filler area is sequentially provided with a water distribution area, a treatment area and a water collection area from the water inlet end to the water outlet end; and a backwashing water inlet pump is arranged at the tail end of the sub-filler area and can be used for extracting treated tail water from the drainage channel as backwashing water to carry out backwashing on the filler, and the backwashing water is discharged. The device disclosed by the utility model is relatively simple in structure, can stably purify low-concentration sewage, and backwashes the filler by virtue of self outlet water; the subsurface flow wetland utilizes treated effluent to carry out partitioned backwashing on different sub-filler regions, so that the filler cleaning cost is reduced, and the operation effect of the subsurface flow wetland is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of subsurface flow wetlands, and more specifically to a subsurface flow wetland structure capable of partial self-backwashing. Background Art

[0002] Subsurface wetlands are a type of artificial wetland that is used more frequently. Subsurface wetlands are artificial landscapes that use hydrophilic plants as surface greening, sand and soil as fillers, and allow water to naturally infiltrate and filter. It is popular among people for its characteristics of no surface water, small footprint, high utilization rate and easy maintenance. Subsurface wetlands can also be used for general sewage treatment. The bottom uses natural gravel or adsorption gravel of different particle sizes, with water inlet on one side and outlet on the other side. Sufficient porosity ensures the flow of water. The middle and upper layers use natural gravel or adsorption gravel of the next-level particle size. The surface layer is covered with sand or soil to plant hydrophilic surface greening plants, which can purify sewage under the combined action of plant root absorption and gravel adsorption function.

[0003] Traditional subsurface flow wetlands are prone to blockage after long-term operation. Once the filler is blocked, the normal operation of the subsurface flow wetland is seriously affected, and the cleaning and replacement of the filler is very troublesome. Utility Model Content

[0004] 1. Technical problems to be solved by the utility model

[0005] In view of the defects and shortcomings of the prior art, the utility model provides a submerged flow wetland structure that can be partially self-backwashed. The utility model has a relatively simple structure, can stably purify low-concentration sewage, and rely on its own effluent to backwash the filler; the submerged flow wetland utilizes treated effluent to backwash different sub-filler areas, thereby reducing the filler cleaning cost and improving the operation effect of the submerged flow wetland.

[0006] 2. Technical solution

[0007] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0008] The utility model discloses a submerged flow wetland structure capable of partial self-backwashing, comprising an inlet channel, a filling area and a drainage channel, wherein the inlet channel is located at the front section of the wetland, and the inlet channel is connected to the filling area through an inlet pipe and supplies water to the filling area;

[0009] The packing area is filled with packing, and the packing area is divided into a plurality of sub-packing areas, and adjacent sub-packing areas are separated by concrete retaining walls;

[0010] Each sub-filling area is set up as a water distribution area, a treatment area, and a water collection area from the water inlet end to the water outlet end;

[0011] The drainage channel is located at the end of the wetland, and the treated tail water is collected through the catchment area and then discharged into the drainage channel;

[0012] A water inlet pump pit is arranged at the end of the sub-filling area, and a backwashing water inlet pump is arranged in the water inlet pump pit. The backwashing water inlet pump can draw treated tail water from the drainage channel as backwashing water to backwash the filler, and the backwashing water is discharged.

[0013] Furthermore, the water inlet channel, filling area and drainage channel are an integrated concrete hard structure.

[0014] Furthermore, the water inlet channel has a depth of 1.5-2.5m, a flow rate of 0.5-1.0m / s, an extra height of not less than 0.5m on all sides, is made entirely of reinforced concrete, and is covered on the top with a concrete cover plate.

[0015] Furthermore, the thickness of the packing layer in the packing area is 0.8-1.6m, and the area of ​​the packing area is determined according to the amount of water treated and the floor area;

[0016] The filling area is divided into at least three sub-filling areas, and adjacent sub-filling areas are separated by concrete retaining walls.

[0017] Furthermore, there is no obvious separation between the adjacent water distribution area, treatment area, and water collection area;

[0018] The water distribution area and water collection area are filled with pebbles with larger particle sizes to achieve uniform water distribution and water collection;

[0019] The treatment area is filled with gravel, zeolite and biomass fillers of smaller particle size according to the properties of the sewage to be treated, so as to treat the sewage, and the bottom of the treatment area is designed with a slope of 1‰-5‰.

[0020] Furthermore, a first valve well is provided in the sub-filling area, a water distribution pipe is provided in the first valve well, and the water distribution pipe is connected to the water inlet pipe; a water inlet valve is provided on the water inlet pipe, and the water inlet valve is provided in the first valve well;

[0021] A water collecting pipe is arranged at the bottom of the water collecting area, and an outlet elbow is arranged at the output end of the water collecting pipe, and the outlet elbow extends into the drainage channel;

[0022] The sub-filling area introduces the untreated sewage in the inlet channel through the water inlet pipe, and evenly transports the untreated sewage to the water distribution area. After being treated in the treatment area, it enters the water collection area, is collected by the water collection pipe at the bottom of the water collection area, and is discharged into the drainage channel through the outlet elbow.

[0023] Furthermore, a water collection pit is provided on one side of the water distribution area, and the retaining walls around the water collection pit extend 10 cm beyond the surface of the filler in the water distribution area.

[0024] Furthermore, a second valve well is provided on one side of the water collection area, and a water inlet pump pit is provided on the other side of the water collection area. The water inlet pump pit is provided in the drainage channel. A backwash water inlet pump is provided in the water inlet pump pit. A perforated pipe is provided at the output end of the backwash water inlet pump, and the perforated pipe is installed in the water collection area.

[0025] Furthermore, the water collecting pipe of each sub-filling area is provided with two outlets, one of the outlets of the water collecting pipe is connected to an outlet elbow, the outlet elbow is located in the drainage channel, and the outlet elbow is in the form of a rotatable elbow, and the water level in the sub-filling area is controlled by the rotation angle;

[0026] Another water outlet of the water collecting pipe extends to the bottom side of the second valve well. A drainage valve is arranged on the pipe body of the water collecting pipe. The drainage valve is arranged in the second valve well. The opening and closing of the outlet is controlled by the drainage valve in the second valve well. When opened, the water stored in the sub-filling area can be discharged into the municipal pipe network.

[0027] 3. Beneficial effects

[0028] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0029] The utility model has a relatively simple structure, can stably purify low-concentration sewage, and rely on its own effluent to backwash the filler; the submerged flow wetland utilizes the treated effluent to backwash different sub-filler areas, thereby reducing the filler cleaning cost and improving the operation effect of the submerged flow wetland. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a top view of the utility model;

[0031] Figure 2 It is the AA cross-sectional view of the utility model;

[0032] Figure 3 It is the BB sectional view of the present utility model.

[0033] In the figure: 1. Inlet channel; 101. Inlet pipe; 2. Filling area; 201. Sub-filling area; 202. Concrete retaining wall; 2011. Water distribution area; 2012. Treatment area; 2013. Water collection area; 2014. First valve well; 2015. Water distribution pipe; 2016. Water collection pipe; 2017. Outlet elbow; 2018. Backwash inlet pump; 2019. Inlet pump pit; 2020. Second valve well; 2021. Perforated pipe; 3. Drainage channel; 4. Water collection pit. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0035] Example 1

[0036] from Figure 1-3 It can be seen that the submerged wetland structure capable of partial self-backwashing in this embodiment includes an inlet channel 1, a filling area 2 and a drainage channel 3, and the inlet channel 1, the filling area 2 and the drainage channel 3 are an integrated concrete hard structure;

[0037] The water inlet channel 1 is located at the front section of the wetland, and the water inlet channel 1 is connected to the filling area 2 through the water inlet pipe 101 and supplies water to the filling area 2;

[0038] Filling is arranged in the filling area 2, and the filling area 2 is equally divided into a plurality of sub-filling areas 201, and adjacent sub-filling areas 201 are separated by a concrete retaining wall 202;

[0039] The present application divides the packing area 2 into a plurality of sub-packing areas 201. During backwashing, targeted backwashing can be performed on the sub-packing areas 201 in different areas, which has higher processing efficiency, better effect, and effectively saves time cost and cleaning cost.

[0040] Each sub-filling area 201 is sequentially configured as a water distribution area 2011, a treatment area 2012, and a water collection area 2013 from the water inlet end to the water outlet end;

[0041] Drainage channel 3 is located at the end of the wetland. After treatment, the tail water is collected through the catchment area 2013 and then discharged into drainage channel 3;

[0042] An inlet pump pit 2019 is provided at the end of the sub-filling area 201, and a backwash inlet pump 2018 is provided in the inlet pump pit 2019. The backwash inlet pump 2018 can draw treated tail water from the drainage channel 3 as backwash water to backwash the filler, and the water after backwashing is discharged.

[0043] The depth of the water inlet channel 1 is 1.5-2.5m, the flow rate is 0.5-1.0m / s, the height around is not less than 0.5m, the whole is made of reinforced concrete, and the top is covered with a concrete cover. A stainless steel grille cover is installed at the position of the water inlet pipe 101 connecting the water inlet channel 1 and the filling area 2 for maintenance.

[0044] The thickness of the packing layer in the packing area 2 is 0.8-1.6 m, and the area of ​​the packing area 2 is determined according to the amount of water to be treated and the floor area; the packing area 2 is equally divided into at least three sub-packing areas 201 .

[0045] There is no obvious separation between the adjacent areas of water distribution area 2011, treatment area 2012, and catchment area 2013;

[0046] The water distribution area 2011 and the water collection area 2013 are filled with pebbles with larger particle sizes to achieve uniform water distribution and water collection;

[0047] The treatment area 2012 is filled with gravel, zeolite and biomass fillers of smaller particle size according to the properties of the sewage to be treated, so as to treat the sewage, and the bottom of the treatment area 2012 is designed with a slope of 1‰-5‰.

[0048] A first valve well 2014 is provided in the sub-filling area 201, a water distribution pipe 2015 is provided in the first valve well 2014, and the water distribution pipe 2015 is connected to the water inlet pipe 101; a water inlet valve is provided on the pipeline of the water inlet pipe 101, and the water inlet valve is provided in the first valve well 2014;

[0049] A water collecting pipe 2016 is provided at the bottom of the water collecting area 2013, and an outlet elbow 2017 is provided at the output end of the water collecting pipe 2016, and the outlet elbow 2017 extends into the drainage channel 3;

[0050] The sub-filling area 201 introduces the untreated sewage in the inlet channel 1 through the water inlet pipe 101, and evenly transports the untreated sewage to the water distribution area 2011. After being treated in the treatment area 2012, it enters the collection area 2013, and is collected by the collection pipe 2016 at the bottom of the collection area 2013 and discharged into the drainage channel 3 through the outlet elbow 2017.

[0051] A water collection pit 4 is arranged on one side of the water distribution area 2011, and the retaining wall around the water collection pit 4 exceeds the filler surface of the water distribution area 2011 by 10 cm.

[0052] A second valve well 2020 is provided on one side of the water collection area 2013, and a water inlet pump pit 2019 is provided on the other side of the water collection area 2013. The water inlet pump pit 2019 is arranged in the drainage channel 3. A backwash water inlet pump 2018 is arranged in the water inlet pump pit 2019. A perforated pipe 2021 is provided at the output end of the backwash water inlet pump 2018. The perforated pipe 2021 is installed in the water collection area 2013.

[0053] The water collecting pipe 2016 of each sub-filling area 201 is provided with two outlets, one of the outlets of the water collecting pipe 2016 is connected to the outlet elbow 217, the outlet elbow 217 is located in the drainage channel 3, and the outlet elbow 2017 is in the form of a rotatable elbow, and the water level in the sub-filling area 201 is controlled by the rotation angle;

[0054] Another water outlet of the water collecting pipe 2016 extends to the bottom side of the second valve well 2020. A drain valve is provided on the pipe body of the water collecting pipe 216. The drain valve is provided in the second valve well 2020. The opening and closing of the outlet is controlled by the drain valve in the second valve well 2020. When opened, the water stored in the sub-filling area 201 can be discharged into the municipal pipeline network.

[0055] A backwashing method for a submerged flow wetland structure capable of partial self-backwashing, comprising the following steps:

[0056] Step 1: When backwashing of the packing in a certain sub-packing area 201 is required, the water inlet valve in the first valve well 2014 is closed to stop water inlet to the sub-packing area 201; the drainage valve in the second valve well 2020 is opened, and the outlet of the outlet elbow 217 of the water collecting pipe 2016 in the drainage channel 3 is rotated to the highest position to stop drainage into the drainage channel 3;

[0057] Step 2: After the water stored in the sub-filling area 201 is drained, close the drainage valve in the second valve well 2020, turn on the backwashing water inlet pump 218, and discharge the effluent of other sub-filling areas 201 in the drainage channel 3 into the sub-filling area 201 to be backwashed, and use the effluent of other sub-filling areas 201 to backwash the sub-filling area 201;

[0058] Step 3: During the backwash period, the backwash water flows from bottom to top, and after exceeding the surface of the packing layer, it overflows the sump 4 in the water distribution area 2011 and is discharged into the municipal pipe network through the sump 4;

[0059] Step 4: After the backwashing is completed, turn off the backwashing water inlet pump 218, open the drain valve in the second valve well 2020, and drain the remaining backwashing water;

[0060] Step 5: Finally, close the valve in the second valve well 2020, open the water inlet valve in the first valve well 2014, rotate the angle of the outlet elbow 2017, and enter the next processing cycle.

[0061] The structure of the submerged flow wetland is relatively simple, and it can stably purify low-concentration sewage and rely on its own effluent to backwash the filler; the submerged flow wetland utilizes the treated effluent to perform zoned backwashing on different sub-filler areas 201, thereby reducing the filler cleaning cost and improving the operation effect of the submerged flow wetland.

[0062] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A submerged wetland structure capable of partial self-backwashing, comprising an inlet channel (1), a filling area (2) and a drainage channel (3), characterized in that: The water inlet channel (1) is located at the front section of the wetland, and the water inlet channel (1) is connected to the filling area (2) through the water inlet pipe (101) and supplies water to the filling area (2); The filling area (2) is filled with fillers, and the filling area (2) is equally divided into a plurality of sub-filling areas (201), and adjacent sub-filling areas (201) are separated by a concrete retaining wall (202); Each sub-filling area (201) is sequentially configured as a water distribution area (2011), a treatment area (2012), and a water collection area (2013) from a water inlet end to a water outlet end; The drainage channel (3) is located at the end of the wetland, and the treated tail water is collected by the catchment area (2013) and then discharged into the drainage channel (3); A water inlet pump pit (2019) is provided at the end of the sub-filling area (201), and a backwashing water inlet pump (2018) is provided in the water inlet pump pit (2019). The backwashing water inlet pump (2018) can extract treated tail water from the drainage channel (3) as backwashing water to backwash the filler, and the water after backwashing is discharged.

2. A submerged flow wetland structure capable of partial self-backwashing according to claim 1, characterized in that: The water inlet channel (1), the filling area (2) and the drainage channel (3) are an integrated concrete hard structure.

3. A submerged flow wetland structure capable of partial self-backwashing according to claim 1, characterized in that: The water inlet channel (1) has a depth of 1.5-2.5 m, a flow rate of 0.5-1.0 m / s, a height of no less than 0.5 m on all sides, is made entirely of reinforced concrete, and is covered on the top with a concrete cover plate.

4. The submerged flow wetland structure capable of partial self-backwashing according to claim 1, characterized in that: The thickness of the packing layer in the packing area (2) is 0.8-1.6 m, and the area of ​​the packing area (2) is determined according to the amount of water to be treated and the floor area. The packing area (2) is equally divided into at least three sub-packing areas (201).

5. The submerged flow wetland structure capable of partial self-backwashing according to claim 1, characterized in that: There is no obvious separation between the adjacent water distribution area (2011), treatment area (2012) and water collection area (2013).

6. A submerged wetland structure capable of partial self-backwashing according to claim 5, characterized in that: A first valve well (2014) is provided in the sub-filling area (201), a water distribution pipe (2015) is provided in the first valve well (2014), and the water distribution pipe (2015) is connected to the water inlet pipe (101); a water inlet valve is provided on the pipeline of the water inlet pipe (101), and the water inlet valve is provided in the first valve well (2014); A water collecting pipe (2016) is arranged at the bottom of the water collecting area (2013); an outlet elbow (2017) is arranged at the output end of the water collecting pipe (2016); and the outlet elbow (2017) extends into the drainage channel (3); The sub-filling area (201) introduces the sewage to be treated in the water inlet channel (1) through the water inlet pipe (101), uniformly transports the sewage to be treated to the water distribution area (2011), and after being treated in the treatment area (2012), enters the water collection area (2013), is collected by the water collection pipe (2016) at the bottom of the water collection area (2013), and is discharged into the drainage channel (3) through the outlet elbow (2017).

7. The submerged flow wetland structure capable of partial self-backwashing according to claim 1, characterized in that: A water collection pit (4) is provided on one side of the water distribution area (2011), and retaining walls surrounding the water collection pit (4) extend 10 cm beyond the filler surface of the water distribution area (2011).

8. The submerged flow wetland structure capable of partial self-backwashing according to claim 6, characterized in that: A second valve well (2020) is provided on one side of the water collection area (2013), and a water inlet pump pit (2019) is provided on the other side of the water collection area (2013). The water inlet pump pit (2019) is provided in the drainage channel (3), and a backwash water inlet pump (2018) is provided in the water inlet pump pit (2019). A perforated pipe (221) is provided at the output end of the backwash water inlet pump (2018), and the perforated pipe (2021) is installed in the water collection area (2013).

9. A submerged flow wetland structure capable of partial self-backwashing according to claim 8, characterized in that: The water collecting pipe (2016) of each sub-filling area (201) is provided with two outlets, one of the outlets of the water collecting pipe (2016) is connected to an outlet elbow (2017), the outlet elbow (2017) is located in the drainage channel (3), and the outlet elbow (2017) is in the form of a rotatable elbow, and the water level in the sub-filling area (201) is controlled by the rotation angle; Another water outlet of the water collecting pipe (2016) extends to the bottom side of the second valve well (2020). A drainage valve is arranged on the pipe body of the water collecting pipe (2016), and the drainage valve is arranged in the second valve well (2020). The opening and closing of the outlet is controlled by the drainage valve in the second valve well (2020). When the outlet is opened, the water stored in the sub-filling area (201) can be discharged into the municipal pipe network.

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