Water resource regulation and storage system for tail water purification and recycled water recycling of sewage treatment plant

Abstract

The utility model relates to water resource regulation and storage equipment, in particular to a water resource regulation and storage system for tail water purification and recycled water recycling of a sewage treatment plant. The system comprises at least one working unit consisting of a horizontal subsurface flow wetland and a reclaimed water regulation and storage pond, the input end of the working unit is connected with the tail water output of a village and town sewage treatment plant and / or the output end of the previous working unit, and the output end of the working unit is connected with the input end of the next working unit and / or the reclaimed water is discharged to a river channel after being detected to reach the standard. An irrigation water taking device is arranged in the reclaimed water regulation and storage pond; the tail water treatment system effectively solves the technical problem that the tail water of the sewage treatment plant in the prior art is not discharged, and has the advantages that the tail water of the sewage treatment plant can be purified, stored and recycled or meet the river discharge standard requirement, the water for irrigation or greening on the way can be met, idle land is reasonably utilized and the like.

Description

Technical Field

[0001] The utility model relates to water resource regulating and storing equipment, in particular to a water resource regulating and storing system used for tail water purification and recycled water recycling in sewage treatment plants. Background Art

[0002] Existing township sewage treatment plant tailwater discharges meet Class IV surface water quality standards, and the effluent quality already meets agricultural irrigation standards. However, with increasingly stringent environmental protection requirements, downstream river water quality assessment standards are now Class III surface water quality. Therefore, sewage treatment plant tailwater remains a source of pollution to downstream water bodies, posing a risk of tailwater contamination of downstream rivers. In response to increasingly stringent environmental protection requirements for sewage treatment plant tailwater discharge into rivers, the effluent quality of some township sewage treatment plants does not meet the regional sewage treatment plant tailwater discharge requirements. This means that the sewage treatment plant tailwater has no discharge destination, resulting in the sewage treatment plant's inability to operate normally.

[0003] Regional recycled water recycling is a model of wastewater resource utilization that coordinates production, ecology, and life in a certain area by constructing artificial wetland water purification and other engineering facilities according to local conditions at key nodes such as downstream of key sewage outlets, river mouths into lakes (seas), and tributaries into the main stream, and further purifying and improving the treated drainage that meets the standards.

[0004] In recent years, the use of ecological technologies such as artificial wetlands and ecological ponds to deeply purify and treat sewage treatment plant tailwater has become the primary choice. The patent document with publication number CN116332369A discloses a multi-stage artificial wetland purification and treatment system for sewage treatment plant tailwater, including an ecological oxidation pond, a horizontal flow artificial wetland, a vertical flow artificial wetland and a seepage channel connected in series with the tailwater discharge pipe. It can simultaneously remove ammonia nitrogen and nitrate nitrogen from the sewage treatment plant tailwater, and has a better removal effect and higher treatment efficiency for residual harmful substances in the tailwater. The patent document with publication number 116675345A discloses a sewage treatment plant tailwater artificial wetland system and a tailwater treatment method. The system includes an ozone tail gas collection device, an ozone tail gas transmission device, a buffer tank, a horizontal subsurface flow artificial wetland and a surface flow artificial wetland connected in sequence. Ozone tail gas is used to provide a chemical for tailwater treatment, solving the problem of ozone tail gas pollution, improving the efficiency of pollutant reduction, and improving the water environment quality. At the same time, it saves the energy consumption and cost required for aeration of the tailwater artificial wetland system. The above patent documents mainly focus on improving the pollutant removal effect when setting up artificial wetlands. They do not consider the destination of the water effluent from the artificial wetlands when it cannot be discharged into the river, nor do they consider the recycling method of the water effluent from the artificial wetlands in the system.

[0005] The applicant has not found any domestic patent document that is identical or similar to the present utility model. Summary of the Invention

[0006] The purpose of this utility model is to provide a water resource storage system for purifying tail water of sewage treatment plants and recycling recycled water. The system can effectively treat the tail water of sewage treatment plants, and the treated water can be stored and reused through recycled water storage reservoirs, thereby achieving pollution control of tail water of sewage treatment plants and resource reuse.

[0007] The overall technical concept of the utility model is:

[0008] A water resource storage system for purifying tailwater from a sewage treatment plant and recycling recycled water, comprising at least one working unit, wherein the input end of the working unit is connected to the tailwater output of a township sewage treatment plant and / or the output end of the previous working unit, and the output end of the working unit is connected to the input end of the next working unit and / or is discharged to a river after being tested and meeting the standards; each working unit comprises:

[0009] A. Horizontal subsurface flow wetland that serves as the input end of the working unit and purifies the input materials;

[0010] B. Recycled water storage reservoir: It includes the reservoir inlet area connected to the material output end of the horizontal subsurface flow wetland, the reservoir settlement area connected to the surface through the first ecological revetment, the material output of the reservoir inlet area and the reservoir settlement area is connected to the reservoir water storage area, the top overflow material of the reservoir water storage area is connected to the second water outlet area as the output end of the working unit, and an irrigation water intake device is set in the reservoir water storage area.

[0011] The number of working units and the area of artificial wetlands in this utility model are determined as follows:

[0012] The horizontal subsurface flow wetland area will be determined based on the wastewater treatment plant tailwater volume and concentrations of major pollutants, in accordance with the "Technical Specifications for Constructed Wetland Water Purification Projects" (DB13 / T5184-2020) and other technical specifications. The number and area of the horizontal subsurface flow wetland units will be calculated and established based on the existing land use conditions of the project. As this is within the knowledge and skills of those skilled in the art, the applicant will not elaborate on it here.

[0013] Irrigation water intake devices are installed within the reclaimed water storage ponds. Pumps can draw water through pipelines to the desired locations for farmland irrigation or roadside landscaping. Multiple reclaimed water storage ponds can be deployed to create multiple irrigation water intake devices, facilitating local water intake for irrigation and tree planting. To facilitate the construction and use of the irrigation water intake devices, the preferred technical implementation is to use reinforced concrete tanks.

[0014] The specific technical concept of the utility model also includes:

[0015] In order to facilitate the reception of effluent from the reclaimed water storage reservoir, improve the system's effluent guarantee capacity, and further enhance the sewage treatment plant's tailwater treatment effect, a preferred technical implementation method is to further include a large-scale storage reservoir, wherein the input end of the large-scale storage reservoir sedimentation area includes a first input end connected to the output end of the final working unit via a water diversion pipeline, and / or a second input end connected to the ground surface via a second ecological revetment; the output end of the large-scale reservoir water storage area includes a first output end connected to the reclaimed water storage reservoir in each working unit via a pipeline, and / or a second output end that discharges to the river after passing the test.

[0016] The main functions of the first ecological revetment and the second ecological revetment are to guide rainwater into reservoir sedimentation areas and large reservoir sedimentation areas, and to carry out preliminary purification of rainwater.

[0017] The first ecological revetment can be constructed in the form of grass revetment, geotechnical composite planting base revetment, vegetation-based ecological concrete revetment, and ecological bag revetment, depending on the actual situation. To facilitate pedestrian passage and the placement of water pumps for water intake, the first ecological revetment is equipped with steps and walkways.

[0018] The second ecological revetment can be selected from fish nest revetment, wire mesh gabion revetment, chain type ecological brick revetment and other forms according to actual conditions.

[0019] In order to facilitate the interception of larger suspended solids in the water coming from large-scale regulating reservoirs and ponds and facilitate material transportation, the preferred technical implementation method is to provide a second grid at the material input end of the large-scale reservoir sedimentation area adjacent to the second ecological revetment. In order to facilitate its structural setting and function realization, the bottom of the second grid and the fifth wall of the large-scale reservoir sedimentation area are assembled in a lifting manner.

[0020] Once the water level in a large-scale regulating and storage pond reaches the regulating water level, the effluent can be discharged into the river if it meets the surface water Class III quality standard and meets the requirements for river discharge after testing. When the water stored in the reclaimed water regulating and storage pond and the horizontal subsurface flow wetland cannot meet the water demand due to factors such as low inflow or precipitation or increased irrigation frequency, the water stored in the large-scale regulating and storage pond will be piped to the reclaimed water regulating and storage pond to replenish the water demand for irrigation.

[0021] In order to improve the utilization rate of idle land and reduce the amount of engineering work, the preferred technical implementation method is to set the working unit in the abandoned irrigation ditch and / or existing pond and / or depression.

[0022] Horizontal subsurface flow wetlands can be implemented using a variety of existing technologies. The preferred technical implementation method is that the horizontal subsurface flow wetland includes an inlet channel as the material input end of the working unit, a filling area with wetland plants on the top is connected to the material output end of the inlet channel through a water distribution pipeline, and the output end of the filling area is connected to the reservoir inlet area through a water collection pipeline. Wetland plants are preferably cattail, loosestrife, calamus, water plantain, yellow iris, etc.

[0023] In order to optimize the structural design of the water inlet channel and meet its functional requirements, the preferred technical implementation method is that the water inlet channel includes a cavity for accommodating incoming water and formed by a first wall. The water inlet end of the wetland water inlet pipe is connected to the incoming water in the cavity, and the water outlet end of the wetland water inlet pipe is connected to the water distribution pipeline in the filling area through the water inlet valve arranged in the first valve well. The water distribution pipeline uses a perforated water distribution pipe.

[0024] In order to improve the treatment effect of the filler on the tail water, the preferred technical implementation method is that the filler area includes the water inlet filler part, the main filler part, the functional filler part and the water outlet filler part arranged in sequence according to the material conveying direction; the functional filler part includes the functional filler arranged in the fourth net box, and the second net box arranged above the fourth net box and containing the surface filler. The functional filler is selected from the filler with nitrogen and phosphorus removal function. The filler with nitrogen and phosphorus removal function is preferably adopted in the following manner: the nitrogen removal filler can be commercially available Filler, the phosphorus removal filler can be commercially available steel slag.

[0025] Furthermore, the water inlet area filler portion includes the water inlet area filler arranged in the first net box; the main body filler portion includes the main body filler arranged in the third net box, and the second net box arranged above the third net box and containing the surface filler; the water outlet area filler portion includes the water outlet area filler arranged in the fifth net box, and the water inlet area filler is preferably adopted as follows: gravel with a particle size of 50 mm and a filling thickness of 900-1100 mm; the main body filler is preferably adopted as follows: including expanded clay filler with a particle size of 0.5-30 mm and modified zeolite with a particle size of 1-5 mm, uniformly mixed in a volume ratio of 2-3:1, with a filling thickness of 800-950 mm; the surface filler is preferably adopted as follows: crushed stone with a particle size of 2-6 mm and a filling thickness of 150-300 mm; the water outlet area filler is preferably adopted as follows: gravel with a particle size of 50 mm and a filling thickness of 900-1100 mm.

[0026] In order to facilitate the structural setting and functional realization of the water collection pipeline, the preferred technical implementation method is that the water collection pipeline uses a perforated water collection pipe arranged in the water outlet area filler in the first water outlet area and arranged perpendicular to the flow direction of the horizontal submerged flow wetland. The water outlet from the horizontal submerged flow wetland is collected by the perforated water collection pipe and then connected to the reservoir inlet area through the wetland outlet pipe and outlet valve.

[0027] In order to further optimize the structural design of the wetland outlet pipe and meet its functional requirements, the preferred technical implementation method is to also include a second valve well for accommodating the outlet pipe and outlet valve, and the outlet end of the wetland outlet pipe is located in the cavity formed by the second wall.

[0028] To intercept large suspended solids in the incoming water from the reclaimed water storage pond, improve water treatment efficiency, and facilitate material transportation, the preferred technical implementation method is to install a first screen at the material input end of the reservoir sedimentation area adjacent to the first ecological revetment. Aquatic plants are planted within the reservoir water storage area. Material from the reservoir water inlet and sedimentation areas is discharged to the reservoir water storage area via an overflow weir. To facilitate the structural design and functional implementation of the first screen, the bottom of the first screen and the third wall of the reservoir sedimentation area are assembled using a lifting mechanism.

[0029] In order to optimize the setting of aquatic plants, the preferred technical implementation method is that aquatic plants can be selected from emergent plants and / or submerged plants. The emergent plants are set at the connection between the reservoir water storage area, the reservoir water inlet area and the reservoir sedimentation area, and the area does not exceed 25% of the water surface of the reservoir water storage area. The submerged plants are set in the middle area of the reservoir water storage area. First, it can enhance the landscape effect of the recycled water storage reservoir, and second, it can effectively control the water pollution inside the wet pond.

[0030] In order to facilitate the material transportation and function realization of large-scale regulating reservoirs, the preferred technical implementation method is that the large-scale regulating reservoirs include a large-scale regulating reservoir sedimentation area as the material input end in the direction of material transportation. The material in the large-scale regulating reservoir sedimentation area is output to the large-scale reservoir water storage area through the overflow weir, and the large-scale reservoir water storage area serves as the material output end of the large-scale regulating reservoir.

[0031] In order to further enhance the treatment effect of large-scale regulating and storage ponds on incoming water, the preferred technical implementation method is to set up reservoir plants, aeration equipment and ecological floating islands in the water storage area of large reservoirs, and hang linear fillers under the ecological floating islands. Reservoir plants include emergent plants and / or floating plants and / or submerged plants. The preferred technical implementation method is to set the ecological floating island at a water depth of 6 to 8 meters in the center of the reservoir water storage area. The linear fillers provide attachment space for anaerobic microorganisms to form an anaerobic treatment zone. The setting of the anaerobic treatment zone is conducive to the formation of anoxic-anaerobic-aerobic multiple environments inside the large-scale regulating and storage ponds, thereby improving the efficiency of water pollutant removal. The aeration equipment is set between the reservoir plants and the ecological floating island. Plug-flow aerators and fountain-type aerators can be selected. First, they improve the reoxygenation capacity of the water body, and second, they form a water circulation system inside the large-scale regulating and storage ponds to avoid eutrophication of the water body.

[0032] In order to facilitate the effective isolation of the untreated working unit from the ground surface, a structural layer with an anti-seepage function is set under the working unit. The preferred technical implementation method is that the structural layer with an anti-seepage function includes a rammed original soil layer set between the working unit and the ground surface, and an anti-seepage layer set between the water inlet area, the main filling part, the functional filling part, and the bottom of the reservoir water storage area and the rammed original soil layer; the anti-seepage layer preferably adopts a sodium-based bentonite waterproof blanket, abbreviated as GCL-NP.

[0033] In order to further optimize the structural design of the second water outlet area and meet its functional requirements, the preferred technical implementation method is that the fourth wall adjacent to the second water outlet area and the reservoir water storage area is provided with a drop weir, and the water inlet end of the reservoir outlet pipe is located in the chamber formed by the fourth wall and the third valve well, and the water outlet end of the reservoir outlet pipe is connected to the material input of the next working unit through the reservoir outlet valve in the third valve well, or is connected to the water diversion pipeline of the large regulating reservoir.

[0034] The first wall, the second wall, the third wall, the fourth wall, the fifth wall and the first valve well, the second valve well and the third valve well are made of reinforced concrete structure.

[0035] The applicant needs to state:

[0036] In the description of this utility model, the terms "bottom," "top," "below," "input," and "output" and the like indicate positions or locations based on those shown in the accompanying drawings. These terms are intended solely to simplify the description of this utility model and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Terms such as "first," "second," "third," "fourth," and "fifth" are used solely to describe distinctions and should not be construed to imply importance.

[0037] The technical advancements achieved by this utility model are:

[0038] 1. This utility model uses horizontal subsurface wetlands and reclaimed water storage ponds as working units to effectively solve the problem of sewage treatment plant tailwater having no discharge destination and thus unable to operate normally. First, the tailwater from the sewage treatment plant is stored and reused, providing a destination for the tailwater. Second, the tailwater from the sewage treatment plant is purified through ecological means to meet local river discharge standards. When the multi-stage purification and irrigation reuse systems of the sewage treatment plant tailwater cannot accommodate the tailwater from the sewage treatment plant, the tailwater can be discharged into the river for treatment. Third, the utility model rationally utilizes idle land such as abandoned irrigation ditches, existing ponds, and depressions.

[0039] 2. This utility model can calculate and set the number of working units based on technical specifications and the current status of the project site, adapting to different construction environments and meeting the water quality purification requirements of sewage treatment plant tailwater. The multi-level reclaimed water storage ponds facilitate water extraction along the route for irrigation or landscaping.

[0040] 3. The horizontal subsurface flow wetland in this utility model is equipped with a functional filler section, which is configured according to the water quality of the sewage treatment plant tailwater, effectively and deeply purifying the tailwater. The reclaimed water storage reservoir is equipped with a reservoir sedimentation area to sediment the rainwater entering the reclaimed water storage reservoir during the rainy season, preventing large amounts of silt and debris from entering the reservoir water area.

[0041] 4. The technical effects of the large-scale regulating and storage ponds provided in this utility model are: first, after the water level in the large-scale regulating and storage ponds reaches the regulating water level, the effluent water can be discharged into the river when the water quality meets the surface water Class III water quality standard and meets the requirements for river discharge after testing. Second, when the water stored in the reclaimed water regulating and storage ponds and the horizontal subsurface flow wetlands cannot meet the water demand due to factors such as low inflow or precipitation, increased irrigation frequency, etc., the water stored in the large-scale regulating and storage ponds can be piped to the reclaimed water regulating and storage ponds to replenish the water and meet the irrigation water demand. Third, the large-scale regulating and storage ponds are provided with internal aeration zones and anaerobic reaction zones, forming an underwater environment with alternating anaerobic and aerobic zones, which can improve the efficiency of microbial nitrification and denitrification and achieve a higher total nitrogen removal rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a block diagram of the working principle of the utility model.

[0043] Figure 2 This is a structural diagram of a horizontal subsurface flow wetland.

[0044] Figure 3 It is a structural diagram of the recycled water storage reservoir.

[0045] Figure 4 yes Figure 3 AA view.

[0046] Figure 5 It is a structural diagram of the recycled water storage reservoir.

[0047] Figure 6 It is a structural diagram of a large-scale regulating reservoir.

[0048] Figure 7 This is an overhead view of a large regulating reservoir.

[0049] The reference numerals in the accompanying drawings are as follows:

[0050] 1. Inlet channel; 1A. First wall; 1B. Wetland inlet pipe; 1C. First valve well; 1D. Inlet valve; 2. Inlet area; 2A. Inlet area filler; 2B. Perforated water distribution pipe; 2C. First mesh box; 3. Main filler section; 3A. Surface filler; 3B. Main filler; 3C. Second mesh box; 3D. Third mesh box; 4. Functional filler section; 4A. Functional filler; 4B. Fourth mesh box; 5. First outlet area; 5A. Outlet area filler; 5B. Wetland outlet pipe; 5C. Perforated water collection pipe; 5D. Fifth mesh box; 6. Second valve well; 6A. Outlet valve; 7. Anti-seepage layer; 8. Original soil compaction layer; 9. Wetland plants; 10. Reservoir Water inlet area; 10A, second wall; 11, first ecological revetment; 11A, steps and walkway; 12, reservoir sedimentation area; 12A, third wall; 12B, first screen; 13, reservoir water storage area; 13A, aquatic plants; 13B, irrigation water intake device; 14, second water outlet area; 14A, fourth wall; 14B, reservoir outlet pipe; 14C, third valve well; 14D, reservoir outlet valve; 15, second ecological revetment; 16, large reservoir sedimentation area; 16A, fifth wall; 16B, second screen; 17, large reservoir water storage area; 17A, reservoir plants; 17B, ecological floating island; 17C, aeration equipment; 17D, linear filler. DETAILED DESCRIPTION

[0051] The present invention is further described below in conjunction with embodiments, but this should not be construed as limiting the present invention. The scope of protection of the present invention is subject to the contents of the claims, and any replacement of equivalent technical means made based on the specification does not depart from the scope of protection of the present invention.

[0052] The overall structure of this embodiment is shown in the figure. It is a water resource storage system for purifying tailwater from a sewage treatment plant and recycling recycled water. It includes at least one working unit. The input end of the working unit is connected to the tailwater output of the township sewage treatment plant and / or the output end of the previous working unit. The output end of the working unit is connected to the input end of the next working unit and / or is discharged to a river after being tested and meeting the standards. Each working unit includes:

[0053] A. Horizontal subsurface flow wetland that serves as the input end of the working unit and purifies the input materials;

[0054] B. Recycled water storage reservoir: It includes a reservoir inlet area 10 connected to the material output end of the horizontal subsurface wetland, a reservoir sedimentation area 12 connected to the surface through a first ecological revetment 11, the material output of the reservoir inlet area 10 and the reservoir sedimentation area 12 is connected to the reservoir water storage area 13, and the overflow material at the top of the reservoir water storage area 13 is connected to the second water outlet area 14 as the output end of the working unit. An irrigation water intake device 13B is set in the reservoir water storage area 13.

[0055] An irrigation water intake device 13B is installed within the reclaimed water storage pond. This device uses a pump to draw water through pipelines to the required locations for farmland irrigation or roadside landscaping. Multiple reclaimed water storage ponds form multiple irrigation water intake devices 13B, each constructed as a reinforced concrete tank.

[0056] It also includes a large regulating reservoir, and the input end of the large regulating reservoir sedimentation area 16 includes a first input end connected to the output end of the final working unit through a water diversion pipeline, and / or a second input end connected to the surface through a second ecological revetment 15; the output end of the large reservoir water storage area 17 includes a first output end connected to the recycled water regulating reservoir in each working unit through a pipeline, and a second output end discharged into the river after passing the inspection.

[0057] The first ecological revetment 11 can be formed of grass revetment, geotechnical composite planting base revetment, vegetation-type ecological concrete revetment, ecological bag revetment, etc. The first ecological revetment 11 is provided with a step walkway 11A.

[0058] The second ecological revetment 15 can be selected from the following forms: fish nest revetment, wire mesh gabion revetment, chain type ecological brick revetment, etc. according to actual conditions.

[0059] A second grid 16B is provided at the material input end of the large reservoir settlement area 16 adjacent to the second ecological revetment 15 , and the bottom of the second grid 16B and the fifth wall 16A of the large reservoir settlement area 16 are assembled in a lifting manner.

[0060] Work units are located in abandoned irrigation ditches and / or existing ponds and / or swales.

[0061] The horizontal subsurface flow wetland includes an inlet channel 1 as the material input end of the working unit. A filling area with wetland plants 9 on the top is connected to the material output end of the inlet channel 1 through a water distribution pipeline. The output end of the filling area is connected to the reservoir inlet area 10 through a water collection pipeline. The wetland plants 9 include cattail, loosestrife, calamus, water plantain, yellow iris, etc.

[0062] In order to optimize the structural design of the water inlet channel and meet its functional requirements, the preferred technical implementation method is that the water inlet channel 1 includes a cavity for accommodating incoming water and is formed by a first wall 1A. The water inlet end of the wetland water inlet pipe 1B is connected to the incoming water in the cavity, and the water outlet end of the wetland water inlet pipe 1B is connected to the water distribution pipeline in the filling area through the water inlet valve 1D provided in the first valve well 1C. The water distribution pipeline uses a perforated water distribution pipe 2B.

[0063] The filling area includes the water inlet filling part, the main filling part 3, the functional filling part 4 and the water outlet filling part arranged in sequence according to the material conveying direction; the functional filling part 4 includes the functional filling 4A arranged in the fourth net box 4B, and the second net box 3C arranged above the fourth net box 4B and containing the surface filling 3A. The functional filling 4A is selected from the filling with nitrogen and phosphorus removal function. The nitrogen removal filling can be selected from commercially available Filler, the phosphorus removal filler can be commercially available steel slag.

[0064] The water inlet area filler portion includes the water inlet area filler 2B arranged in the first net box 2C; the main filler portion 3 includes the main filler 3B arranged in the third net box 3D, and the second net box 3C arranged above the third net box 3D and containing the surface filler 3A; the water outlet area filler portion includes the water outlet area filler 5A arranged in the fifth net box 5D. The water inlet area filler 2B is preferably composed of gravel with a particle size of 50 mm and a filling thickness of 900-1100 mm; the main filler 3B is composed of a uniform mixture of ceramsite filler with a particle size of 0.5-30 mm and modified zeolite with a particle size of 1-5 mm in a volume ratio of 2-3:1, with a filling thickness of 800-950 mm; the surface filler 3A is composed of crushed stone with a particle size of 2-6 mm and a filling thickness of 150-300 mm; the water outlet area filler 5A is composed of gravel with a particle size of 50 mm and a filling thickness of 900-1100 mm.

[0065] The water collection pipeline uses a perforated water collection pipe 5C arranged in the water outlet area filler 5A in the first water outlet area 5 and arranged perpendicular to the flow direction of the horizontal submerged flow wetland. The water out of the horizontal submerged flow wetland is collected by the perforated water collection pipe 5C and then connected to the reservoir water inlet area 10 through the wetland outlet pipe 5B and the outlet valve 6A.

[0066] It also includes a second valve well 6 for accommodating a water outlet pipe 5B and a water outlet valve 6A. The outlet end of the wetland water outlet pipe 5B is located in the cavity formed by the second wall 10A.

[0067] A first screen 12B is installed at the material input end of the reservoir settling area 12, adjacent to the first ecological revetment 11. Aquatic plants 13A are planted in the reservoir water storage area 13. Materials from the reservoir water inlet area 10 and the reservoir settling area 12 are discharged to the reservoir water storage area 13 via an overflow weir. The bottom of the first screen 12B is assembled with the third wall 12A of the reservoir settling area 12 in a lifting manner.

[0068] Aquatic plants 13A can be selected from emergent plants and submerged plants. The emergent plants are arranged at the connection between the reservoir water storage area 13, the reservoir water inlet area 10 and the reservoir sedimentation area 12, and the area does not exceed 25% of the water surface of the reservoir water storage area 13. The submerged plants are arranged in the middle area of the reservoir water storage area 13.

[0069] The large regulating reservoir includes a large regulating reservoir sedimentation area 16 as a material input end according to the material transportation direction. The material in the large regulating reservoir sedimentation area 16 is output to the large reservoir water storage area 17 through the overflow weir. The large reservoir water storage area 17 serves as the material output end of the large regulating reservoir.

[0070] Large reservoirs and ponds are equipped with pond plants 17A, aeration equipment 17C, and ecological floating islands 17B. Linear fillers 17D are suspended beneath ecological floating islands 17B. Reservoir plants 17A include emergent, floating, and submerged plants. Ecological floating islands 17B are located in the center of reservoirs and ponds at a depth of 6-8 meters. Linear fillers 17D provide attachment space for anaerobic microorganisms, forming an anaerobic treatment zone. Aeration equipment 17C, which can be either a push-flow or fountain-type aerator, is located between pond plants 17A and ecological floating islands 17B.

[0071] The structural layer with anti-seepage function includes a rammed earth layer 8 arranged between the working unit and the ground surface, and an anti-seepage layer 7 arranged between the water inlet area 2, the main filling part 3, the functional filling part 4, the bottom of the reservoir water storage area 13 and the rammed earth layer 8; the anti-seepage layer 7 adopts a sodium-based bentonite waterproof blanket, abbreviated as GCL-NP.

[0072] The fourth wall 14A adjacent to the second water outlet area 14 and the reservoir water storage area 13 is provided with a drop weir. The water inlet end of the reservoir outlet pipe 14B is located in the chamber formed by the fourth wall 14A and the third valve well 14C. The water outlet end of the reservoir outlet pipe 14B is connected to the material input of the next working unit through the reservoir outlet valve 14D in the third valve well 14C, or is connected to the water diversion pipeline of the large regulating reservoir.

[0073] The first wall 1A, the second wall 10A, the third wall 12A, the fourth wall 14A, the fifth wall 16A, the first valve well 1C, the second valve well 6, and the third valve well 14C are made of reinforced concrete structures.

Claims

1. A water resource storage system for tail water purification and recycled water recycling in sewage treatment plants, characterized by It includes at least one working unit, the input end of the working unit is connected to the tail water output of the township sewage treatment plant and / or the output end of the previous working unit, the output end of the working unit is connected to the input end of the next working unit and / or is discharged to the river after testing to meet the standards; each working unit includes: A. Horizontal subsurface flow wetland that serves as the input end of the working unit and purifies the input materials; B. Recycled water storage reservoir: It includes a reservoir inlet area (10) connected to the material output end of the horizontal subsurface wetland, a reservoir sedimentation area (12) connected to the surface through the first ecological revetment (11), the material output of the reservoir inlet area (10) and the reservoir sedimentation area (12) is connected to the reservoir water storage area (13), the top overflow material receiving water area (14) of the reservoir water storage area (13) serves as the output end of the working unit, and an irrigation water intake device (13B) is set in the reservoir water storage area (13).

2. The water resource storage system for wastewater treatment plant tail water purification and recycled water recycling according to claim 1 is characterized in that The invention also includes a large regulating reservoir, wherein the input end of the large regulating reservoir sedimentation area (16) includes a first input end connected to the output end of the final working unit through a water diversion pipeline, and / or a second input end connected to the ground surface through a second ecological revetment (15); the output end of the large reservoir water storage area (17) includes a first output end connected to the regenerated water regulating reservoir in each working unit through a pipeline, and / or a second output end discharged to the river after passing the test.

3. The water resource storage system for wastewater treatment plant tail water purification and recycled water recycling according to claim 1 or 2, characterized in that Work units are located in abandoned irrigation ditches and / or existing ponds and / or swales.

4. The water resource storage system for wastewater treatment plant tail water purification and recycled water recycling according to claim 1 is characterized in that The horizontal subsurface flow wetland includes an inlet channel (1) as a material input end of a working unit, a filling area with wetland plants (9) arranged on the top, which is connected to the material output end of the inlet channel (1) through a water distribution pipeline, and the output end of the filling area is connected to the reservoir water inlet area (10) through a water collection pipeline.

5. The water resource storage system for tail water purification and recycled water recycling of sewage treatment plants according to claim 4 is characterized in that The packing area includes a water inlet packing portion, a main packing portion (3), a functional packing portion (4), and a water outlet packing portion, which are sequentially arranged in the direction of material conveying; the functional packing portion (4) includes a functional packing (4A) arranged in a fourth net box (4B), and a second net box (3C) arranged above the fourth net box (4B) and containing a surface packing (3A); the functional packing (4A) is a packing with nitrogen and phosphorus removal function.

6. The water resource storage system for tail water purification and recycled water recycling of sewage treatment plants according to claim 5 is characterized in that The water inlet filling portion includes a water inlet filling portion (2B) arranged in a first net box (2C); the main body filling portion (3) includes a main body filling portion (3B) arranged in a third net box (3D), and a second net box (3C) arranged above the third net box (3D) and containing a surface filling portion (3A); and the water outlet filling portion includes a water outlet filling portion (5A) arranged in a fifth net box (5D).

7. The water resource storage system for wastewater treatment plant tail water purification and recycled water recycling according to claim 1 is characterized in that A first grid (12B) is provided at the material input end of the reservoir sedimentation area (12) adjacent to the first ecological revetment (11); aquatic plants (13A) are planted in the reservoir water storage area (13); and materials from the reservoir water inlet area (10) and the reservoir sedimentation area (12) are output to the reservoir water storage area (13) through an overflow weir.

8. The water resource storage system for tail water purification and recycled water recycling of sewage treatment plants according to claim 2 is characterized in that The large-scale regulating storage pond includes, in order of material conveying direction, a large-scale regulating storage pond sedimentation area (16) as a material input end, the material in the large-scale regulating storage pond sedimentation area (16) is output to the large-scale reservoir water storage area (17) through an overflow weir, and the large-scale reservoir water storage area (17) serves as the material output end of the large-scale regulating storage pond.

9. The water resource storage system for purifying tail water from a sewage treatment plant and recycling recycled water according to claim 8, characterized in that A large reservoir water storage area (17) is provided with reservoir plants (17A), an aeration device (17C) and an ecological floating island (17B). Linear fillers (17D) are suspended below the ecological floating island (17B). The reservoir plants (17A) include emergent plants and / or floating plants and / or submerged plants.

10. The water resource storage system for tail water purification and recycled water recycling of sewage treatment plants according to claim 1 or 2, characterized in that A structural layer with an anti-seepage function is provided under the working unit.

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