Water source water quality purification system for recovery of natural bank zone of river in arid region

Abstract

The invention relates to a water source water quality purification system for recovery of a natural bank zone of a river in an arid region, the water source water quality purification system comprises a hydraulic power supply unit, a water quality purification unit and a river bank remodeling unit which are sequentially connected in series, and water flow sequentially flows through the hydraulic power supply unit, the water quality purification unit and the river bank remodeling unit and then flows to an external river channel from the river bank remodeling unit; the hydraulic power supply unit comprises a sewage treatment plant and a water pumping station, the water quality purification unit comprises a soil percolation system and an ecological purification pond, the river bank remodeling unit comprises a floodplain, the floodplain is close to a river channel, and the floodplain is located between the water quality purification unit and the river channel; all structures in the water source water quality purification system are connected through a water diversion channel, and the water diversion channel between a water quality purification unit and a river channel penetrates through a flood plain. The soil percolation system comprises a multi-soil-layer percolation mechanism, at least one or more water distribution pipes are arranged in the multi-soil-layer percolation mechanism, and each water distribution pipe is correspondingly connected with a plurality of water quality strengthening and purifying grids.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification and ecological restoration, and in particular to a water source water purification system for restoring natural river banks in arid areas, which can be applied to ecological restoration of rivers and water pollution control. Background Art

[0002] Now, due to climate change, droughts often occur in both the north and the south. In particular, the water shortage problem in arid areas such as the north and northwest has long seriously affected the local ecological environment and socio-economic development. Due to low precipitation, the amount of river water is extremely unstable. In addition, the river flows through agricultural and industrial areas, carrying a large amount of pollutants, especially nutrients such as nitrogen and phosphorus, and organic matter, causing eutrophication of water bodies and serious deterioration of water quality. At the same time, traditional river water purification methods mainly rely on physical and chemical means, such as sewage treatment plants and artificial wetlands, but the application of these methods in arid areas in the north is limited by the following aspects: High construction and operation costs: Conventional sewage treatment facilities, such as activated sludge method and physical and chemical precipitation method, have high construction and operation costs and require continuous energy and maintenance, making them difficult to promote on a large scale in arid areas.

[0003] Insufficient ecological restoration capacity: Most existing water purification systems rely on artificial technologies, with limited ability to repair natural river ecosystems, and ignore the role of natural plants and microorganisms in water purification. Especially in arid areas, the vegetation and ecological functions of natural river banks are gradually degenerating, and they are unable to effectively cope with the accumulation of pollutants.

[0004] Insufficient use of unconventional water sources: There is a shortage of water resources available for river recharge in the arid northern regions, but unconventional water sources (such as recycled water, tail water, etc.) have not been fully utilized. Since unconventional water sources usually contain high concentrations of organic matter and nutrients, an economical and efficient treatment system is needed to ensure that their water quality meets the requirements of the ecological environment.

[0005] Existing technologies are difficult to provide effective solutions to these problems. Therefore, there is an urgent need for a system that can combine ecological restoration and water purification functions to restore the natural banks of rivers and improve water quality in northern arid regions in a low-cost and sustainable manner. Summary of the invention

[0006] In view of the above technical problems, the present invention proposes a water source water quality purification system for restoring natural river banks in arid areas, which can overcome the above-mentioned deficiencies of the prior art.

[0007] To achieve the above technical objectives, the technical solution of the present invention is implemented as follows: A water source water purification system for restoring the natural bank of a river in an arid area, comprising a hydraulic supply unit, a water purification unit, and a river bank remodeling unit connected in series, and water flows through the hydraulic supply unit, the water purification unit, and the river bank remodeling unit in sequence, and then flows from the river bank remodeling unit to an external river channel; The hydraulic supply unit includes a sewage treatment plant and a water pumping station; the water purification unit includes at least one soil infiltration system and at least one ecological purification pond; the riverbank reconstruction unit includes a floodplain, which is adjacent to the river channel and located between the water purification unit and the river channel; the sewage treatment plant is connected to the water pumping station, the water pumping station is connected to the soil infiltration system closest to it, the adjacent soil infiltration systems and ecological purification ponds are connected to each other, and the water purification unit is connected to the river channel; The connection between the various structures in the water source water purification system is achieved through the water diversion channel, and the water diversion channel between the water purification unit and the river channel passes through the floodplain; The soil infiltration system comprises a multi-soil layer infiltration mechanism, in which at least one water distribution pipe is arranged, and each water distribution pipe is respectively connected with a plurality of water quality enhancement purification grids.

[0008] During implementation, the hydraulic supply unit is used to regulate and distribute water volume, the water purification unit is used to strengthen and purify water quality, and the riverbank remodeling unit is used to reshape the riverbank ecological landscape. The water quality strengthening and purification grid is used to deeply remove trace organic pollutants and toxic substances in the water flow. The soil infiltration system is used to filter the purified water flow for the second time to further improve the water quality. The hydraulic load of the soil infiltration system is preferably 1.5m 3 / (m 2 ·d). Ecological purification ponds further remove pollutants from water through plant root adsorption and filtration functions.

[0009] Preferably, all soil infiltration systems and ecological purification ponds are connected in series in an alternating manner.

[0010] Preferably, the water purification unit comprises a soil infiltration system module and an ecological purification pond module which are connected in series in sequence; all soil infiltration systems are connected in series in sequence to form a soil infiltration system module, all ecological purification ponds are connected in series in sequence to form an ecological purification pond module, the soil infiltration system module is connected to a water pumping station, and the ecological purification pond module is connected to a river channel.

[0011] Preferably, there is only one soil infiltration system and one ecological purification pond, and the water inlet of the soil infiltration system is connected to the water outlet of the water pumping station, the water inlet of the water pumping station is connected to the water outlet of the sewage treatment plant, the water outlet of the soil infiltration system is connected to the water inlet of the ecological purification pond, and the water outlet of the ecological purification pond is connected to the river.

[0012] Preferably, the water diversion passage is a pipe, a ditch or a channel, depending on actual needs, as long as it can meet the implementation needs.

[0013] Preferably, the water quality enhancement purification grid adopts a cylindrical composite straight tube; Preferably, the water quality enhancement purification grid is filled with high-efficiency purification carbon material; Preferably, in the corresponding water quality enhancement purification grids and water distribution pipes, all water quality enhancement purification grids are distributed on the same side of the corresponding water distribution pipes, or are staggered on both sides of the water distribution pipes.

[0014] Preferably, the distance between two adjacent water quality enhancement purification grids is preferably greater than or equal to 1 meter; the diameter of the cylindrical composite straight pipe is preferably 300mm and the length is preferably 3.2 meters, which are set according to actual needs. The port of the water quality enhancement purification grid is preferably connected to the water diversion pipelines on both sides by a PE160 pipe, and the water inlet size of the purification grid is 150mm. The water quality enhancement purification grid can be provided with an outlet pipe, which can be a 100mm covered pipe, and the surface of the end cover can be perforated to ensure that the tail water can penetrate into the lower gravel cushion layer for filtration after being treated by the water quality enhancement purification grid; the effluent can be transported into the ecological purification pond through a PE160 gravity flow pipeline to further improve the water quality. The water quality enhancement purification grid is filled with high-efficiency purification carbon material.

[0015] Preferably, the multi-soil layer infiltration mechanism includes an upper original soil layer, a middle gravel cushion layer and a lower crushed stone cushion layer arranged in sequence from top to bottom, and all water quality enhancement purification grids and water distribution pipes are located in the middle gravel cushion layer.

[0016] Preferably, the upper original soil layer is composed of backfilled original soil, the upper original soil layer is located above the middle gravel cushion layer, plants are planted on the upper original soil layer, and the bottom of the upper original soil layer is isolated by geotextile.

[0017] Preferably, the middle gravel cushion layer is composed of gravel, the water quality enhancement purification grid and the water distribution pipe are buried in the middle gravel cushion layer, and the bottom of the middle gravel cushion layer is isolated by geotextile; Preferably, the lower gravel cushion layer is composed of gravel, and the lower gravel cushion layer is used to effluent from the water quality enhancement purification grid and allow the treated water flow to have sufficient residence time. The thickness of the upper original soil layer is preferably 300 mm, the thickness of the middle gravel cushion layer is preferably 300 mm, and the thickness of the lower gravel cushion layer is preferably 600 mm.

[0018] Preferably, the plants planted on the upper original soil layer include local drought-tolerant plants, and one or any number of plants selected from reed, cattail, loosestrife, lotus, water plantain, dwarf pampas grass, and rush are planted to enhance the overall landscape effect.

[0019] Preferably, the requirements for the planting soil of the upper original soil layer for planting plants can be as follows: the excavated soil of the existing site can be used for planting after being processed, the excavated existing soil should be cleaned, garbage, weeds, debris, gravel, rubble, etc. should be removed, and sieved to ensure the fine density and uniformity of the soil. After meeting the planting requirements, backfill in layers according to the requirements of the drawings.

[0020] Preferably, the ecological purification pond includes an ecological pond, aquatic vegetation, a landscape stone waterfall retaining wall and an ecological pond drainage pipe.

[0021] Preferably, the ecological pond can be constructed and arranged around the edge of the main river channel in combination with the existing topography of the river.

[0022] Preferably, the eco-pond can adopt a soft bottom method, which can be specifically: after the pond body is excavated, the bottom soil is tamped, and a coarse sand cushion layer with a thickness of 200mm is laid with a compaction degree ≧85%, and then a PE anti-seepage membrane is laid, and a geotextile protective layer is set above and below the anti-seepage membrane; first, backfill with planting soil with a thickness of 200mm and a compaction degree ≧85%, and finally backfill with planting soil with a thickness of 400mm; finally, the surrounding terrain is leveled and connected, and backfill and reinforce the area between the eco-pond and the main riverbed.

[0023] Preferably, the anti-seepage requirements of the ecological pond are as follows: the ecological pond anti-seepage adopts two cloths and one membrane, SN is a staple needle non-woven geotextile substrate, with 2 layers, one layer on the top and one layer on the bottom; the anti-seepage membrane is a PE membrane, with 1 layer; the nominal strength is 16kN / m; the unit area mass of the 2-layer non-woven fabric is 400g / m; the membrane thickness is 0.7mm. Preferably, the coverage rate of aquatic vegetation is preferably>=30%.

[0024] Preferably, the landscape stone water-fall retaining wall is located in the ecological pond. The landscape stone water-fall retaining wall adopts the method of internal reinforced concrete structure main body and landscape stone outer masonry. The concrete structure cushion layer is preferably 200mm thick. Grouting can be used between the landscape stone water-fall retaining walls to ensure firmness. The concrete cushion layer under the landscape stone and the junction of the ecological pond edge need to be extended outward by 2m to meet the requirements of the water-retaining structure. Preferably, the ecological pond drainage pipe can be located between each level of ecological pond and the lower level ecological pond and the main river channel. PVC pipes can be used. The specific location can be set according to the actual situation on site. Nets may be installed at both ends of the pipe to avoid garbage blockage; the diameter of the PVC pipe is preferably 150mm.

[0025] Beneficial effects of the invention: Based on soil infiltration technology, ecological purification ponds and water quality enhanced purification grids, the present invention proposes a water purification system for unconventional water sources suitable for arid areas in the north. By utilizing the synergistic effect of soil, plants and microorganisms, the system can effectively remove nitrogen, phosphorus, suspended matter and trace organic pollutants in the water body, and through vegetation restoration and the construction of ecological ponds, gradually restore the ecological function of the natural river bank, forming a river system with strong self-purification ability and good ecological environment.

[0026] The disclosure can significantly remove nitrogen, phosphorus and organic matter from water bodies through the synergistic effect of a multi-level infiltration system and an ecological purification pond, with high purification efficiency and low cost. Through the vegetation restoration of aquatic vegetation, the system can effectively improve the ecological environment of the riparian zone, restore its natural ecological functions, and at the same time improve the landscape value of the region. The disclosure is specially designed for use in northern arid areas, can adapt to the hydrological and climatic conditions of the region, and has strong ecological adaptability and sustainability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is further described in detail below with reference to the accompanying drawings.

[0028] Figure 1 It is a schematic structural diagram of a water source water quality purification system for restoring natural river banks in arid areas according to an embodiment of the present invention.

[0029] Figure 2 It is a top view cross-sectional view of the soil infiltration system described in an embodiment of the present invention.

[0030] Figure 3 It is a top-down cross-sectional view of the soil infiltration system and the multi-stage ecological purification pond according to an embodiment of the present invention.

[0031] Figure 4 It is a cross-sectional view from the main perspective of the soil infiltration system and the multi-stage ecological purification pond described in the embodiment of the present invention.

[0032] Figure 5 This is a working flow chart of a water source water quality purification system for restoring natural river banks in arid areas according to an embodiment of the present invention.

[0033] In the figure: 1. Sewage treatment plant; 2. Water pumping station; 3. Soil infiltration system; 301. Multi-soil layer infiltration mechanism; 3011. Upper original soil layer; 3012. Middle gravel cushion layer; 3013. Lower crushed stone cushion layer; 302. Water quality enhanced purification grid; 303. Water distribution pipe; 4. Multi-section ecological purification pond; 5. Pipeline; 6. Floodplain; 7. River channel. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0035] like Figure 1-3 As shown, in order to facilitate understanding of the above technical solutions of the present invention, the above technical solutions of the present invention are described in detail below through specific usage methods.

[0036] In specific use, the water source water purification system for restoring the natural bank zone of a river in arid areas comprises a hydraulic supply unit, a water purification unit, and a river bank remodeling unit connected in series in sequence, and water flows through the hydraulic supply unit, the water purification unit, and the river bank remodeling unit in sequence, and then flows from the river bank remodeling unit to the external river channel 7; The hydraulic supply unit includes a sewage treatment plant 1 and a water pumping station 2, the water purification unit includes at least one soil infiltration system 3 and at least one ecological purification pond 4, the riverbank reconstruction unit includes a floodplain 6, the floodplain 6 is adjacent to a river channel 7, and the floodplain 6 is located between the water purification unit and the river channel 7; the sewage treatment plant 1 is connected to the water pumping station 2, the water pumping station 2 is connected to the soil infiltration system 3 closest to it, the soil infiltration systems 3 and the ecological purification pond 4 adjacent to each other are connected, and the water purification unit is connected to the river channel 7; The connection between the various structures in the water source water purification system is achieved through a water diversion passage 5, and the water diversion passage 5 between the water purification unit and the river 7 passes through the floodplain 6; The soil infiltration system 3 comprises a multi-soil layer infiltration mechanism 301 , in which at least one water distribution pipe 303 is provided, and each water distribution pipe 303 is respectively connected to a plurality of water quality enhancement purification grids 302 .

[0037] During implementation, the hydraulic supply unit is used to regulate and distribute water volume, the water purification unit is used to strengthen and purify water quality, and the riverbank remodeling unit is used to reshape the riverbank ecological landform. The water quality strengthening and purification grid 302 is used to deeply remove trace organic pollutants and toxic substances in the water flow. The soil infiltration system 3 is used to filter the purified water flow for the second time to further improve the water quality. The hydraulic load of the soil infiltration system 3 is preferably 1.5m 3 / (m 2 ·d) Ecological purification pond 4 further removes pollutants in the water flow through plant root adsorption and filtration functions.

[0038] In a certain embodiment, all soil infiltration systems 3 and ecological purification ponds 4 are connected in series in an alternating manner.

[0039] In a certain embodiment, the water purification unit includes a soil infiltration system module and an ecological purification pond module connected in series; all soil infiltration systems 3 are connected in series to form a soil infiltration system module, and all ecological purification ponds 4 are connected in series to form an ecological purification pond module. The soil infiltration system module is connected to the water pumping station 2, and the ecological purification pond module is connected to the river 7.

[0040] In a certain embodiment, the number of soil infiltration systems 3 and ecological purification pond 4 is one, and the water inlet of the soil infiltration system 3 is connected to the water outlet of the water pumping station 2, the water inlet of the water pumping station 2 is connected to the water outlet of the sewage treatment plant 1, the water outlet of the soil infiltration system 3 is connected to the water inlet of the ecological purification pond 4, and the water outlet of the ecological purification pond 4 is connected to the river 7.

[0041] In a certain embodiment, the water diversion passage 5 is a pipe, a ditch or a channel, which depends on actual needs as long as it can meet the implementation needs.

[0042] In one embodiment, the water quality enhancement purification grid 302 is a cylindrical composite straight tube; In one embodiment, the water quality enhancement purification grid 302 is filled with a high-efficiency purification carbon material; In one embodiment, among the corresponding water quality enhancement purification grids 302 and water distribution pipes 303 , all water quality enhancement purification grids 302 are distributed on the same side of the corresponding water distribution pipes 303 , or are staggered on both sides of the water distribution pipes 303 .

[0043] In a certain embodiment, the distance between two adjacent water quality enhancement purification grids 302 is preferably greater than or equal to 1 meter; the diameter of the cylindrical composite straight pipe is preferably 300mm and the length is preferably 3.2 meters, which are set according to actual needs. The port of the water quality enhancement purification grid 302 is preferably connected to the water diversion pipeline on both sides by a PE160 pipe, and the water inlet size of the purification grid is 150mm. The water quality enhancement purification grid can be provided with an outlet pipe, which can be a 100mm covered pipe, and the surface of the end cover can be perforated to ensure that the tail water can penetrate into the lower gravel cushion layer 3013 for filtration after being treated by the water quality enhancement purification grid 302; the effluent can be transported into the ecological purification pond 4 through a PE160 gravity flow pipeline to further improve the water quality. The water quality enhancement purification grid is filled with high-efficiency purification carbon material.

[0044] In one embodiment, the multi-soil layer infiltration mechanism 301 includes an upper original soil layer 3011 , a middle gravel cushion layer 3012 and a lower crushed stone cushion layer 3013 arranged in sequence from top to bottom, and all water quality enhancement purification grids 302 and water distribution pipes 303 are located in the middle gravel cushion layer 3012 .

[0045] In one embodiment, the upper undisturbed soil layer 3011 is composed of backfilled undisturbed soil, the upper undisturbed soil layer 3011 is located above the middle gravel cushion layer 3012, plants are planted on the upper undisturbed soil layer 3011, and the bottom of the upper undisturbed soil layer 3011 is isolated with geotextile.

[0046] In one embodiment, the middle gravel cushion layer 3012 is composed of gravel, the water quality enhancement purification grid 302 and the water distribution pipe 303 are buried in the middle gravel cushion layer 3012, and the bottom of the middle gravel cushion layer 3012 is isolated by geotextile; In one embodiment, the lower gravel cushion layer 3013 is composed of gravel, and the lower gravel cushion layer 3013 is used to discharge water from the water quality enhancement purification grid 302 and allow the treated water flow to have sufficient residence time. The thickness of the upper original soil layer 3011 is preferably 300 mm, the thickness of the middle gravel cushion layer 3012 is preferably 300 mm, and the thickness of the lower gravel cushion layer 3013 is preferably 600 mm.

[0047] In one embodiment, the plants planted on the upper original soil layer 3011 include local drought-tolerant plants, and one or any number of plants selected from reeds, cattails, loosestrife, lotus, water plantain, dwarf pampas grass, and rush are planted to enhance the overall landscape effect.

[0048] In one embodiment, the requirements for the planting soil of the upper original soil layer 3011 for planting plants may be: the excavated soil of the existing site can be used for planting after being processed, the excavated existing soil should be cleaned, garbage, weeds, debris, gravel, rubble, etc. should be removed, and sieved to ensure the fine density and uniformity of the soil. After meeting the planting requirements, backfill in layers according to the requirements of the drawings.

[0049] In one embodiment, the ecological purification pond 4 includes an ecological pond 401, aquatic vegetation 402, a landscape stone waterfall retaining wall 403 and an ecological pond drainage pipe.

[0050] In one embodiment, the ecological pond 401 can be constructed and arranged around the edge of the main channel of the river channel 7 in combination with the existing topography of the river channel 7 .

[0051] In a certain embodiment, the eco-pond 401 can adopt a soft bottom method, and the specific method can be: after the pond body is excavated, the bottom soil is tamped, and a coarse sand cushion layer with a thickness of 200mm is laid, and the compaction degree is ≧85%, and then a PE anti-seepage membrane is laid, and a geotextile protective layer is set above and below the anti-seepage membrane; first, the planting soil is backfilled with a thickness of 200mm, and the compaction degree is ≧85%, and finally the planting soil is backfilled with a thickness of 400mm; finally, the surrounding terrain is leveled and connected, and the area between the eco-pond and the main riverbed is backfilled and reinforced.

[0052] In one embodiment, the anti-seepage requirements of the ecological pond 401 are preferably: the anti-seepage of the ecological pond 401 adopts two cloths and one membrane, SN is a staple needle non-woven geotextile substrate, the number of layers is 2 layers, one layer on the top and one layer on the bottom; the anti-seepage membrane is a PE membrane, the number of layers is 1 layer; the nominal strength is 16kN / m; the unit area mass of the two layers of non-woven fabric is 400g / m; the membrane thickness is 0.7mm. In one embodiment, the coverage rate of the aquatic vegetation 402 is preferably>=30%.

[0053] In a certain embodiment, the landscape stone waterfall retaining wall 403 is located in the ecological pond 401. The landscape stone waterfall retaining wall 403 adopts an internal reinforced concrete structure main body and landscape stone external masonry. The concrete structure cushion layer is preferably 200mm thick. Grouting can be used between the landscape stone waterfall retaining wall 403 to ensure firmness; the concrete cushion layer under the landscape stone and the junction with the edge of the ecological pond need to be extended outward by 2m to ensure the requirements of the water retaining structure.

[0054] In one embodiment, the ecological pond drainage pipe can be located between each level of ecological pond and the lower level ecological pond and the main river channel. PVC pipes can be used. The specific location can be set according to the actual situation on site. Nets may be installed at both ends of the pipe to avoid garbage blockage. The diameter of the PVC pipe is preferably 150 mm.

[0055] Working principle: The water source water quality purification system includes a sewage treatment plant 1, a water pumping station 2, a soil infiltration system 3, a multi-section ecological purification pond 4, a pipeline 5, and a river floodplain 6. The domestic wastewater or industrial wastewater is strengthened and purified step by step before being discharged into the river 7, so that the discharged wastewater finally meets the national standard (preferably according to the Class A standard).

[0056] The soil infiltration system 3 can be used for water bodies after secondary filtration and purification. The sewage after pre-treatment is distributed to a multi-soil layer infiltration mechanism 301 with a certain structure and good diffusion performance at a certain depth from the ground surface by the water quality enhancement purification grid 302, so that the sewage moves downward and around under the capillary infiltration and infiltration of the matrix, and the sewage purification effect is achieved through the combined action of soil-plant-microorganism. The multi-soil layer infiltration mechanism 301 includes an upper original soil layer 3011, a middle gravel cushion layer 3012 and a lower gravel cushion layer 3013, which have a certain structure and good permeability, and are preferably artificially transformed. The sewage passing through the water distribution pipe 303 slowly infiltrates into the surrounding upper original soil layer 3011, the middle gravel cushion layer 3012 and the lower gravel cushion layer 3013 through the water quality enhancement purification grid 302, and diffuses in each layer due to capillary action. At the same time, the filtration, adsorption and some biological effects in the soil purify the sewage.

[0057] The ecological pond 401 can be constructed and arranged around the edge of the main river channel in combination with the existing terrain of the river channel 7. The ecological pond adopts a soft pool bottom method. After the pond body is excavated, the bottom soil is rammed, and a coarse sand cushion layer with a thickness of 200 is laid, with a compaction degree of ≧85%. Then a PE anti-seepage membrane is laid, and a geotextile protective layer is arranged above and below the anti-seepage membrane; then 600mm thick planting soil is backfilled in layers, first backfilling the planting soil with a thickness of 200mm, with a compaction degree of ≧85%, and finally backfilling the planting soil with a thickness of 400mm; finally, the surrounding terrain is leveled and connected, and the area between the ecological pond and the main river channel is backfilled and reinforced.

[0058] The scenic stone waterfall retaining wall is located in the ecological pond. The scenic stone waterfall retaining wall adopts an internal reinforced concrete structure and a scenic stone outer masonry method. The concrete structure cushion layer is 200mm thick and uses C30 concrete. There is a 200mm thick crushed stone cushion layer underneath. The scenic stones are stacked in layers. The side length of the scenic stones is controlled at 300-800mm and the thickness is 200-400mm to meet the requirements of water retaining and overflow. Grouting is used between the scenic stones to ensure firmness. The concrete cushion layer under the scenic stones needs to be extended outward by 2m at the junction with the edge of the ecological pond to ensure the requirements of the water retaining structure.

[0059] Ecological purification pond 4 is the tailwater treatment link of the whole system. The water entering ecological purification pond 4 is regarded as tailwater. Ecological purification pond 4 is a newly excavated pond. Combined with the current terrain of the river channel, it is built and arranged around the edge of the main river channel. The designed water depth is 1~2m, the slope ratio is not less than 1:3, and the bottom is treated with anti-seepage. It receives the effluent of the soil infiltration system in the tailwater wetland purification project for deep treatment. With submerged and emergent aquatic vegetation 402 as the core, the nutrients in the tailwater are effectively removed through the adsorption and biodegradation of the roots of aquatic vegetation 402. The ecosystem achieves the purpose of deep purification of incoming water, regulation and storage, and increase of dissolved oxygen in the water body. While creating ecological treatment measures, it repairs the hydrological landform of the river channel and restores the integrity of the ecosystem in the river channel. Multi-stage waterfalls are used to enter the main river channel of river channel 7 to complete the ecological enhancement of the effluent of the sewage treatment plant and further improve the water quality. The effluent quality after treatment by the ecological purification pond system meets the surface water level Class IV standard in the "Surface Water Environmental Quality Standard" (GB3838-2002).

[0060] After the entire water source water purification system is built, the ecological function of the riverbank can be restored by sowing plants such as reeds and cattails. These plants can not only fix and absorb nutrients in the water through their roots, further improving the water purification effect, but also beautify the environment and enhance the landscape effect of the system.

[0061] In summary, by adopting the above unique technical scheme, the present disclosure successfully proposes a water purification system for unconventional water sources suitable for arid areas in the north based on soil infiltration technology, ecological purification ponds and water quality enhanced purification grids. By utilizing the synergistic effect of soil, plants and microorganisms, the system can effectively remove nitrogen, phosphorus, suspended matter and trace organic pollutants in the water body, and through vegetation restoration and the construction of ecological ponds, gradually restore the ecological function of the natural river bank, forming a river system with strong self-purification ability and good ecological environment.

[0062] The disclosure can significantly remove nitrogen, phosphorus and organic matter from water bodies through the synergistic effect of a multi-level infiltration system and an ecological purification pond, with high purification efficiency and low cost. Through the vegetation restoration of aquatic vegetation, the system can effectively improve the ecological environment of the riparian zone, restore its natural ecological functions, and at the same time improve the landscape value of the region. The disclosure is specially designed for use in northern arid areas, can adapt to the hydrological and climatic conditions of the region, and has strong ecological adaptability and sustainability.

[0063] In the description of the present invention, it is necessary to understand that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

Claims

1. A water source water purification system for restoring the natural shore zone of a river in arid areas, characterized in that: It comprises a hydraulic supply unit, a water purification unit, and a river bank remodeling unit which are connected in series in sequence, and water flows through the hydraulic supply unit, the water purification unit, and the river bank remodeling unit in sequence, and then flows from the river bank remodeling unit to an external river channel (7); The hydraulic supply unit comprises a sewage treatment plant (1) and a water pumping station (2); the water purification unit comprises at least one soil infiltration system (3) and at least one ecological purification pond (4); the riverbank remodeling unit comprises a floodplain (6); the floodplain (6) is adjacent to the river channel (7); the floodplain (6) is located between the water purification unit and the river channel (7); the sewage treatment plant (1) is connected to the water pumping station (2); the water pumping station (2) is connected to the soil infiltration system (3) closest to it; the soil infiltration system (3) and the ecological purification pond (4) adjacent to each other are connected; and the water purification unit is connected to the river channel (7); The connection between the various structures in the water source water purification system is achieved through a water diversion passage (5), and the water diversion passage (5) between the water purification unit and the river channel (7) passes through the floodplain (6); The soil infiltration system (3) comprises a multi-soil layer infiltration mechanism (301), wherein the multi-soil layer infiltration mechanism (301) is provided with at least one water distribution pipe (303), and each of the water distribution pipes (303) is respectively connected to a plurality of water quality enhancement purification grids (302).

2. The water source water purification system according to claim 1, characterized in that: All the soil infiltration systems (3) and ecological purification ponds (4) are connected in series in an alternating manner.

3. The water source water purification system according to claim 1, characterized in that: The water purification unit comprises a soil infiltration system module and an ecological purification pond module which are connected in series in sequence; All the soil infiltration systems (3) are connected in series to form the soil infiltration system module, all the ecological purification ponds (4) are connected in series to form the ecological purification pond module, the soil infiltration system module is connected to the water pumping station (2), and the ecological purification pond module is connected to the river channel (7).

4. The water source water purification system according to claim 1, characterized in that: The number of the soil infiltration system (3) and the ecological purification pond (4) is one each, and the water inlet of the soil infiltration system (3) is connected to the water outlet of the water pump station (2), the water inlet of the water pump station (2) is connected to the water outlet of the sewage treatment plant (1), the water outlet of the soil infiltration system (3) is connected to the water inlet of the ecological purification pond (4), and the water outlet of the ecological purification pond (4) is connected to the river channel (7).

5. The water source water purification system according to claim 1, characterized in that: The water diversion passage (5) is a pipeline, a channel or a ditch.

6. The water source water purification system according to claim 1, characterized in that: The water quality enhancement purification grid (302) adopts a cylindrical composite straight pipe; The water quality enhancement purification grid (302) is filled with a high-efficiency purification carbon material; In the corresponding water quality enhancement purification grids (302) and water distribution pipes (303), all the water quality enhancement purification grids (302) are distributed on the same side of the corresponding water distribution pipes (303), or are staggered on both sides of the water distribution pipes (303).

7. The water source water purification system according to claim 1, characterized in that: The multi-soil layer infiltration mechanism (301) comprises an upper original soil layer (3011), a middle gravel cushion layer (3012) and a lower crushed stone cushion layer (3013) arranged in sequence from top to bottom, and all the water quality enhanced purification grids (302) and water distribution pipes (303) are located in the middle gravel cushion layer (3012).

8. The water source water purification system according to claim 7, characterized in that: The upper original soil layer (3011) is composed of backfilled original soil, the upper original soil layer (3011) is located above the middle gravel cushion layer (3012), plants are planted on the upper original soil layer (3011), and the bottom of the upper original soil layer (3011) is isolated by geotextile; The middle gravel cushion layer (3012) is composed of gravel, the water quality enhancement purification grid (302) and the water distribution pipe (303) are buried in the middle gravel cushion layer (3012), and the bottom of the middle gravel cushion layer (3012) is isolated by geotextile; The lower gravel cushion layer (3013) is composed of gravel, and the lower gravel cushion layer (3013) is used to discharge water from the water quality enhancement purification grid (302) and allow the treated water flow to have sufficient residence time.

9. The water source water purification system according to claim 1, characterized in that: The plants planted on the upper original soil layer (3011) include local drought-tolerant plants, and one or any number of reeds, cattails, loosestrife, lotus, water plantain, dwarf pampas grass, and rush are selected for planting. The designed aquatic vegetation coverage is ≥30%, and the landscape effect of the system is improved.

10. The water source water purification system according to claim 7, characterized in that: The ecological purification pond (4) comprises an ecological pond (401), aquatic vegetation (402), a landscape stone waterfall retaining wall (403) and an ecological pond drainage pipeline.

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