Sponge facility rainwater collecting, purifying and recycling device

Abstract

The utility model discloses a sponge facility rainwater collecting, purifying and recycling device. Comprising a grass planting ditch, a sunken greenbelt, an environment-friendly overflow well, a multi-stage purification pond and a water collection irrigation system, wherein the grass planting ditch is positioned on the sunken greenbelt close to the edge of the road so as to receive and transfer rainwater on the road and the greenbelt to the environment-friendly overflow well; a mud settling well is arranged at the lower part of the overflow well, and rainwater settled in the mud settling well is discharged to the multi-stage purification tank through a pipeline; rainwater purified by the multi-stage purification pond is connected to a water collection irrigation system through a water outlet pipeline, so that the rainwater is lifted for greening irrigation or road flushing. Rainwater is transferred to the overflow well for pretreatment through the grass planting ditch and the sunken green land, sundries and silt in the rainwater are effectively intercepted, the influence of suspended solids and the like on the multi-stage purification pond is reduced, meanwhile, pipe network blockage is reduced, and garbage sundries, silt and the like only need to be cleaned regularly.

Description

Technical Field

[0001] The utility model relates to a rainwater collection, purification and recycling device for sponge facilities. Background Art

[0002] Sponge city means that the city can adapt to environmental changes and respond to natural disasters like a sponge, with good "elasticity". It can seep, retain, store and purify water when it rains, and release and utilize the stored water when needed to achieve a benign urban hydrological cycle. Sponge city plays an important role in alleviating urban waterlogging and urban heat island effect, reducing urban runoff pollution, saving water resources, protecting and improving the ecological environment. The construction of sponge city should follow the principle of ecological priority, implement the design concept of slow drainage and slow release, and decentralized control of the source, combine natural approaches with artificial measures, and maximize the natural accumulation, infiltration and purification of rainwater on the premise of ensuring the safety of urban drainage and flood control, and promote the utilization of rainwater resources.

[0003] At present, the discharge of urban runoff rainwater mostly adopts the traditional method of "rainwater inlet / overflow well-connecting pipe-municipal rainwater pipe network". By setting up rainwater inlets on the roadside or overflow wells in green belts, rainwater is collected and discharged into the rainwater pipe network. Since the initial rainwater contains pollutants such as organic matter, pathogens, heavy metals, grease, suspended solids, etc., the pollution level is high. Direct discharge into natural water bodies such as rivers and lakes will cause serious water environment pollution and waste of water resources. In addition, a large amount of rainwater discharged into the drainage pipe instantly will increase the drainage pressure of the pipe network. The municipal drainage system relies on large-scale infrastructure and pipe network construction, which is costly and inefficient. It can be seen that the traditional rainwater discharge method is difficult to meet the requirements of modern urban stormwater management.

[0004] In addition, the existing rainwater recycling system usually sets up a PP water storage module or other water storage facilities (collectively referred to as rainwater recycling facilities) at the end of the rainwater pipe network. During rainfall, rainwater enters the recycling facility for storage, and during the dry season, the rainwater in the water storage facility is processed and pressurized for recycling. However, the device contains multiple components such as a water storage tank, a pre-sedimentation tank, and a water storage tank. The stored rainwater needs to be processed separately, which occupies a large area and is costly.

[0005] Therefore, the existing rainwater discharge and reuse technology has the following problems: (1) There is a lack of "infiltration, retention and purification" water facilities, the initial rainwater pollution level is high, and the water environment pollution and water resource waste are serious; (2) The drainage pressure of the pipeline network is high during heavy rain, and the repeated arrangement of rainwater inlets and overflow outlets in the sponge project transformation increases the construction cost; (3) The rainwater reuse and purification process is complicated, occupies a large area, requires a lot of reagents, consumes a lot of energy, and has high equipment use and maintenance costs. Up to now, the existing rainwater collection, purification and reuse technology cannot effectively solve the above problems. Therefore, it is urgent to propose a natural purification and reuse system that can purify, store and reuse the runoff rainwater by natural means while discharging the accumulated rainwater. Utility Model Content

[0006] In view of the above problems, the utility model provides a sponge facility rainwater collection, purification and reuse device, which is based on natural means, through the multi-stage synergistic effect of filtration adsorption-oxidation reduction-microbial degradation, can completely remove pollutants in the initial rain runoff and reuse it, which can improve the rainwater quality, restore the self-purification and ecological landscape functions of the water body, and has the advantages of low cost, high purification efficiency, simple structure, strong applicability, easy maintenance, and ecological protection.

[0007] In order to achieve the above-mentioned purpose, the utility model discloses a rainwater collection, purification and reuse device for a sponge facility, comprising a grass-planting ditch (1), a sunken green space (2), an environmentally friendly overflow well (3), a multi-stage purification pool (4) and a water collection and irrigation system (5); wherein the grass-planting ditch (1) is located near the edge of the road of the sunken green space (2) to receive and transfer rainwater from the road and the green space to the environmentally friendly overflow well (3); a sludge well (31) is provided at the lower part of the overflow well (3), and rainwater after sedimentation in the sludge well (31) is discharged to the multi-stage purification pool (4) through a pipeline; rainwater purified by the multi-stage purification pool (4) is connected to the water collection and irrigation system (5) through a water outlet pipeline, so that the rainwater can be lifted and used for greening irrigation or road washing.

[0008] Furthermore, the grass-planting ditch (1) is directly paved outside the flat curbstone and is arranged along the longitudinal direction of the road. A horizontal shallow dish-shaped grass-planting ditch is arranged at the overflow well (3) to communicate with the longitudinal grass-planting ditch. The overflow well (3) is located in the center of the sunken green space (2);

[0009] The grass-planting ditch (1) has a trapezoidal cross section or an arc-shaped ditch bottom with a concave shape, an upper width of 20 to 30 cm, a depth of 15 cm, an upper end surface flush with the top of the sunken green space (2), and is planted with erosion-resistant grass.

[0010] Furthermore, the overflow well (3) is composed of a silt well (31), a well body (32), a well cover (33) and a planting cavity (34) formed by a depression in the middle of the well cover; the silt well (31) is located at the lower part of the well body (32), and the silt and large particle pollutants in the initial rainwater settle at the bottom of the silt well.

[0011] Furthermore, the manhole cover (33) protrudes from the ground, and a water inlet is provided on the side wall. A sewage interception net (11) is provided in the grass-planted ditch at the junction of the water inlet and the grass-planted ditch (1), and a sewage interception net is provided on the top of the inner side wall of the manhole to block larger fallen leaves, garbage and debris in rainwater; a plurality of guide plates (35) are arranged on the water inlet, one end of the guide plate extends to the side wall of the overflow manhole cover, and the other end is connected to the outer wall of the planting cavity; plants are planted inside the planting cavity to form a miniature rain garden, and a ventilation pipe (36) is connected to the bottom and is connected to the overflow manhole; a rainwater drainage pipe is connected to the side wall of the overflow manhole 10 cm away from the top, and is connected to the multi-stage purification tank.

[0012] Furthermore, the multi-stage purification pool (4) is divided into a filtration pool (41), a settling pool (42), an ecological pool (43) and a water outlet pool (44) by partitions, and a grid filter (411) is arranged at the bottom of the filtration pool partition; and overflow weirs (421) are arranged at the top of the settling pool and the ecological pool partitions.

[0013] Furthermore, the filtration pool (41) is filled with filtering and purifying fillers, including pebbles, gravel, zeolite and activated carbon, and the particle size of the fillers decreases from top to bottom; the submerged pool (42) is composed of submerged plants, soil layers and filler layers from top to bottom, and the fillers are quartz sand, zeolite, ceramsite and the like; the inner wall of the ecological pool (43) is provided with support brackets for supporting and fixing the support frame (431), and biological biofilm fillers (432) are suspended at the bottom of the support frame, and the biological fillers are bionic carbon fiber water plants; an overflow pipe (441) and an outlet pipe (442) are provided in the outlet pool (44), and the top inlet of the overflow pipe is close to the top of the pool body, 50 to 100 mm higher than the normal water level, and excess rainwater can be discharged into the municipal rainwater pipe network; the outlet pipe is connected to the lifting pump (51) of the water collection and irrigation system (5).

[0014] Furthermore, the water collection irrigation system (5) is composed of a lifting pump (51), a water supply network (52) and a sprinkler head (53); wherein the lifting pump (51) is connected to the water supply network (52), and the water supply network is connected to the sprinkler head (53) via a plurality of connecting pipes.

[0015] Furthermore, the planted plants are emergent plants, which are plants with strong sewage purification capabilities such as reeds, irises, loosestrife, lily of the valley, and cannas; the submerged plants include Vallisneria, duckweed, foxtail algae, and black algae.

[0016] In order to achieve the above-mentioned purpose, the utility model provides a method for collecting, purifying and reusing rainwater from a sponge facility, wherein the method comprises the following steps:

[0017] The initial and mid-late rainwater is received by the grass-planted ditch and transferred to the overflow well. Before entering the overflow well, leaves, garbage and other debris are intercepted outside the well by the sewage interception net;

[0018] The silt and large particle pollutants in the rainwater in the well settle at the bottom of the sedimentation well, and the pre-treated rainwater is discharged to a multi-stage purification pool through a pipeline; the interior of the purification pool is divided into a filter pool, a sinking pool, an ecological pool and a water outlet pool by a partition, and the various pools are connected in sequence. A grid filter is set at the bottom of the filter pool partition, and an overflow weir is set at the top of the sinking pool and the ecological pool partition;

[0019] The purification filler in the filter pool absorbs grease and heavy metal pollutants. The water body and residual pollutants after primary treatment enter the submerged water tank through the grid filter. The submerged plants degrade nitrogen and phosphorus pollutants. The treated water body enters the ecological pool through the overflow weir. Indigenous microorganisms are added to the pool. After the carbon fiber water grass is covered with biofilm, the microorganisms continue to degrade nitrogen, phosphorus, organic matter, etc., to achieve self-purification of the water body.

[0020] After natural deep purification, the rainwater enters the outlet pool through the overflow weir, and is lifted by the lifting pump to the sprinkler head or sprinkler plug of the water supply network for use in greening irrigation or road washing.

[0021] The utility model has the following beneficial effects:

[0022] (1) In response to the pollution and purification and reuse issues of initial rainwater runoff, a sponge facility rainwater collection, purification and reuse device and method are disclosed. Through grass-planted ditches and sunken green spaces, rainwater is transferred to overflow wells for pre-treatment, effectively intercepting debris and silt in rainwater, reducing the impact of suspended matter on multi-stage purification tanks, and at the same time reducing pipe network blockage. Garbage, debris and silt only need to be cleaned up regularly.

[0023] (2) The design process of multi-stage purification, multi-layer filler layer, and plant-microorganism deep purification is adopted. The filter tank is filled with purification filler to absorb pollutants such as grease and heavy metals, the submerged plants in the sinking tank degrade pollutants such as nitrogen and phosphorus, and the microorganisms in the ecological pool continuously degrade nitrogen and phosphorus, organic matter, etc., to achieve self-purification of the water body. In addition, this process effectively prolongs the residence time of rainwater in the purification tank, making it easier for fillers, plants and microorganisms to absorb and degrade pollutants in the initial runoff rainwater, improving the pollution interception effect and purification function. The rainwater after natural deep purification can be directly used for greening irrigation and road washing.

[0024] (3) Through the synergistic effect of sponge facilities and purification pools, rainwater runoff pollution can be reduced, and the natural accumulation, natural purification and reuse of rainwater can be achieved, saving water resources, improving the utilization rate of rainwater resources, and reducing the drainage pressure of the municipal pipeline network, achieving the effect of dual control of water quantity and water quality.

[0025] (4) Based on the sponge facilities, the purified excess rainwater is directed to the municipal rainwater pipe network to form a full-process sponge drainage system, which can be matched with landscape design to achieve the organic integration of function and environment, and create a livable, smart, harmonious, happy and resilient city. The utility model realizes the collection, purification, reuse and excess discharge of rainwater based on natural environmental protection measures, and has the advantages of low cost, high purification efficiency, simple structure, strong applicability, green energy saving, economical and beautiful, and ecological and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a plan view of the rainwater collection, purification and reuse device of the sponge facility of the embodiment of the utility model;

[0027] Figure 2 A cross-sectional view of a rainwater collection, purification and reuse device of a sponge facility according to an embodiment of the utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the grille filter of an embodiment of the utility model;

[0029] Figure 4 It is a structural schematic diagram of an overflow weir of an embodiment of the utility model;

[0030] Figure 5 A schematic diagram of an implant cavity according to an embodiment of the present utility model;

[0031] Figure 6 It is a plan view of a device for road rainwater outlet drainage according to an embodiment of the utility model.

[0032] In the figure: 1. Grass-planted ditch; 11. Sewage interception net; 2. Sunken green space; 3. Environmentally friendly overflow well; 31. Sediment well; 32. Well body; 33. Well cover; 34 / 34a. Planting cavity; 35. Guide plate; 36. Ventilation pipe; 4. Multi-stage purification tank; 41. Filtration tank; 411. Grid filter; 41a. Reaction tank; 42. Settling tank; 421. Overflow weir; 43. Ecological tank; 431. Support frame; 432. Biofilm filler; 433. Aeration pipe; 44. Outlet tank; 441. Overflow pipe; 442. Outlet pipe; 5. Water collection irrigation system; 51. Lifting pump; 52. Water supply network; 53. Sprinkler head. DETAILED DESCRIPTION

[0033] The embodiments of the utility model are described in detail below with reference to the accompanying drawings.

[0034] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0036] Example 1

[0037] from Figures 1-2 It can be seen that the rainwater collection, purification and reuse device of the sponge facility of this embodiment includes a grass-planted ditch 1, a sunken green space 2, an environmentally friendly overflow well 3, a multi-stage purification pool 4 and a water collection irrigation system 5, and the overflow well 3 and the purification pool 4 are located in the center of the sunken green space 2. The grass-planted ditch 1 is located near the edge of the road in the sunken green space 2, and is arranged along the longitudinal direction of the outer side of the flat curbstone, and a horizontal shallow dish-shaped grass-planted ditch is arranged at the overflow well 3 to connect the longitudinal grass-planted ditch and the overflow well, and receive and transfer the road and green space rainwater to the overflow well 3. A sludge well 31 is provided at the bottom of the overflow well 3, which can separate the silt and large particle pollutants in the initial rainwater. A rainwater drainage pipe is connected to the side wall of the overflow well 3 10 cm away from the top, and the drainage pipe is connected to the multi-stage purification pool 4. The rainwater after precipitation is discharged to the multi-stage purification pool 4 through the pipe. The interior of the purification tank 4 is divided into a filter tank 41, a settling tank 42, an ecological tank 43 and a water outlet tank 44 by partitions. The tank bodies are connected in sequence. A grille filter 411 is arranged at the bottom of the filter tank partition, and the length and width of the grille hole are 0.5cm to 1cm; an overflow weir 421 is arranged on the top of the settling tank and the ecological tank partition. The overflow weir is a triangular weir, and the elevation is reduced by 10cm in sequence.

[0038] The filter pool 41 is filled with purification fillers, including pebbles, gravel, zeolite and activated carbon, and the filler particle size decreases from top to bottom. The pebble particle size is 20-50mm and the thickness is 5-8cm, which is used to buffer and reduce the kinetic energy of rainwater and protect the lower filter material; the gravel particle size is 10-30mm and the thickness is 5-10cm; the zeolite particle size is 5-8mm and the thickness is 15-20cm; granular or powdered activated carbon is filled in the reaction bag to prevent water flow impact and loss. The reaction bag is made of permeable geotextile, which can be sealed after filling the material on the ground, and then hoisted one by one by the lifting equipment on the ground and placed in layers on the bottom of the pool, thereby completing the entire loading of the filler.

[0039] The sinking tank 42 is filled with a soil layer and a filler layer. The filler is quartz sand, zeolite, ceramsite, etc. The particle size increases from top to bottom to form a reverse osmosis layer to prevent soil loss in the soil layer. Submerged plants are planted in the soil layer. The thickness of the soil matrix is ​​10cm to 15cm; the particle size of the quartz sand filter material is 1mm to 3mm, and the thickness is 15cm to 20cm; the particle size of the ceramsite is 5mm to 8mm, and the thickness is 12cm to 15cm.

[0040] Support brackets are arranged around the inner side of the ecological pool 43 to support and fix the support frame 431. The support frame is made of multiple stainless steel solid pipes welded vertically and horizontally, with a grid spacing of 10 cm. A biological film filler 432 is hung at the bottom of the support frame 431 as a microbial carrier, which can assist in fixing microorganisms and is conducive to the enrichment of dominant bacteria. The biological filler is a bionic carbon fiber water grass, and a heavy object is hung at the bottom of the water grass to keep the water grass vertically stretched and suspended, and can swing appropriately within a certain range in the water, thereby enhancing the probability of microbial attachment and the accumulation of pollutants such as nitrogen, phosphorus, and organic matter in the water body, and improving the ability of aquatic plants to absorb and degrade COD, nitrogen and phosphorus.

[0041] An overflow pipe 441 and an outlet pipe 442 are arranged inside the water outlet pool 44. The top inlet of the overflow pipe 441 is close to the top of the pool body and is 50-100 mm higher than the normal water level, so that excess rainwater can be discharged into the municipal rainwater pipe network. The outlet pipe 442 is connected to the lifting pump 51 of the water collection irrigation system 5, and the lifting pump 51 is connected to the water supply pipe network 52. The water supply pipe network 52 is provided with a plurality of connecting pipes for connecting the sprinkler head 53.

[0042] The initial and mid-to-late rainwater is received by the grass-planting ditch 1 and transferred to the overflow well 3. Before entering the overflow well, leaves, garbage and other debris are intercepted outside the well by the sewage interception net 11. The silt and large particle pollutants in the rainwater in the well settle at the bottom of the sedimentation well 31. The pre-treated rainwater is discharged to the multi-stage purification pool 4 through a pipe, and infiltrates through the purification filler in the filter pool 41. The filler absorbs pollutants such as grease and heavy metals. The water body and residual pollutants after primary treatment enter the sedimentation pool 42 through the grille filter. The submerged plants degrade pollutants such as nitrogen and phosphorus. The treated water body enters the ecological pool 43 through the overflow weir. Indigenous microorganisms are added to the ecological pool. The microorganisms continue to degrade nitrogen, phosphorus, organic matter, etc. after the carbon fiber water grass is covered with film, thereby realizing self-purification of the water body. After natural deep purification, rainwater enters the water outlet pool 44 through the overflow weir, is connected to the water collection irrigation system 5 by the water outlet pipe 442, and is lifted by the lifting pump 51 to the sprinkler head 53 or sprinkler plug of the water supply network 52 for use as greening irrigation or road washing.

[0043] Specifically, the cross-section of the grass-planting ditch 1 is a trapezoid or an arc with a concave bottom, the upper opening is 20 to 30 cm wide and 15 cm deep, the upper end surface is flush with the top of the sunken green space, and erosion-resistant grass is planted.

[0044] Specifically, the overflow well 3 is composed of a sediment well 31, a well body 32, a well cover 33 and a planting cavity 34 formed by a depression in the middle of the well cover. The sediment well 31 is located at the lower part of the well body 32. The silt and large particles of pollutants in the initial rainwater settle at the bottom of the sediment well. The well cover 33 protrudes from the ground and is sealed on the top of the well wall in an inverted bowl shape. A water inlet is opened on the side wall. The junction between the water inlet and the grass-planting ditch 1 is located in the grass-planting ditch. A sewage interception net 11 is set in the grass-planting ditch. A sewage interception net is also set on the top of the inner side wall of the well to block larger fallen leaves, garbage and debris in the rainwater. Several guide plates 35 are arranged at the water inlet. One end of the guide plate 35 extends to the side wall of the overflow well cover, and the other end is connected to the outer wall of the planting cavity 34. Plants can be planted inside the planting cavity 34 to form a miniature rain garden. A ventilation pipe 36 is connected to the bottom and is connected to the overflow well.

[0045] Specifically, the planted plants are emergent plants, which include reeds, irises, loosestrife, lily of the valley, and cannas, which have strong sewage purification capabilities; the submerged plants include Vallisneria, Dermatophyte, Foxtail Algae, and Hydrilla.

[0046] Example 2

[0047] As a further improvement of the above embodiment, Figure 2 As shown, the size of the multi-stage purification pool 4 can be set as a composite purification pool according to the site scale and the pollution of the initial rainwater quality. The interior is divided into a filter pool 41, a reaction pool 41a, a sinking pool 42, an ecological pool 43 and an outlet pool 44 by a partition. The reaction pool 41a is used to remove pollutants such as nitrogen and phosphorus that are difficult to degrade. The reaction pool 41a is filled with a soil layer and multifunctional nanomaterials. The thickness of the soil layer matrix soil is 10cm to 15cm, and emergent plants are planted; the multifunctional nanomaterials include an ammonia nitrogen removal layer, a phosphorus removal layer and a COD removal layer from top to bottom. The multifunctional nanomaterials can be filled in the reaction bag to prevent water flow impact and loss. The thickness of the ammonia nitrogen removal layer is 2 to 8cm, the thickness of the phosphorus removal layer is 2 to 8cm, and the thickness of the COD removal layer is 10 to 20cm.

[0048] Specifically, an aeration device is also provided in the ecological pool 43, and the aeration pipe 433 is connected to the air compressor on the ground through a valve and is automatically controlled by the PLC system. The aeration pipe 433 is also connected to the ecological pool 43, and is fixed to the upstream side wall and bottom of the pool body by a bracket, 5 to 10 cm away from the bottom of the pool. The diameter of the aeration pipe is 5 to 10 cm, and aeration holes are evenly arranged on the aeration pipe, with a hole diameter of 5 mm. Intermittent aeration is provided to the ecological pool through the aeration device to promote the growth of microbial agents and to form biofilms on the biofilm fillers, thereby strengthening the degradation of pollutants in rainwater and realizing the self-purification function.

[0049] Example 3

[0050] As a further improvement of the above embodiment, in this embodiment, a movable plant planting cavity 34a is set on the upper part of any pool body of the filtration pool 41, the reaction pool 41a, the sinking pool 42, and the ecological pool 43. Plants are planted in the cavity to form a rain garden, which can improve the water storage capacity and enrich the vegetation landscape. In addition, a support bracket is set at the bottom of the cavity around each pool body to support the planting cavity 34a. Figure 5 As shown, the planting cavity 34a is made of glass fiber reinforced plastic with a thickness of 8 to 12 mm. The bottom of the cavity shrinks inward to form a cylinder with a large top and a small bottom, which can be embedded in the pool. The cavity is filled with planting soil with a thickness of 20 cm to 25 cm. A permeable geomembrane is laid on the bottom. Small holes are evenly opened at the bottom with a hole diameter of 1 to 3 cm, so that the purified rainwater can be discharged into each pool. Specifically, the lower part of the planting soil can also be filled with water purification filter materials, including one or more of quartz sand, zeolite, ceramsite, manganese sand, garnet, etc., with a particle size of 1 mm to 8 mm and a thickness of 10 cm to 25 cm.

[0051] Specifically, handles can be provided around the planting cavity so that the staff can remove the planting cavity 34a from the pool body. On the one hand, it is convenient to clean and replace the filling inside the planting cavity and renew the plants; on the other hand, it is convenient to clean the pool body and clean and replace the filling of the filter tank, sedimentation tank and ecological pool.

[0052] Example 4

[0053] As a further improvement of the above embodiment, Figure 6It can be seen that the rainwater collection, purification and reuse device of the sponge facility of this embodiment can be used for the road rainwater outlet drainage type. The device includes a rainwater outlet, a grass-planting ditch 1, a sunken green space 2, an environmentally friendly overflow well 3, a multi-stage purification pool 4 and a water collection irrigation system 5. The overflow well 3 and the purification pool 4 are located in the center of the sunken green space 2. The rainwater outlet is connected to the overflow well 3 through a drainage pipe. The grass-planting ditch 1 is located near the edge of the road in the sunken green space 2, and is arranged along the longitudinal direction of the outer side of the vertical curb. A horizontal shallow dish-shaped grass-planting ditch is arranged at the overflow well 3 to connect the longitudinal grass-planting ditch and the overflow well. A horizontal through-hole is provided on the vertical curb to connect the road surface with the grass-planting ditch 1. The size of the hole is 30cm*10cm, and the spacing is 5m. Surface runoff rainwater is collected through the road, part of the rainwater enters the grass-planting ditch through the opening of the curb, and part of the rainwater is collected through the rainwater outlet and enters the drainage pipe. The road and green space rainwater is received and transferred to the overflow well 3 through the grass-planting ditch and the drainage pipe. The overflow well 3 is connected to a rainwater drainage pipe on the side wall 30 cm from the top. The drainage pipe is connected to the multi-stage purification tank 4, and the precipitated rainwater is discharged to the multi-stage purification tank 4 through the pipe. The sponge facility rainwater collection, purification and reuse device in the utility model can handle the initial rainwater runoff pollution and continuously purify the mid- and late-stage rainwater. The suspended solids removal rate is about 90%, the COD removal rate is about 60-85%, the total nitrogen removal rate is about 65-80%, and the total phosphorus removal rate is about 70-83%. The rainwater quality is significantly improved. The treated water can be reused for greening irrigation or road washing, and the excess rainwater is discharged into the municipal rainwater pipe network through the overflow pipe.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0056] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A sponge facility rainwater collection, purification and reuse device, characterized in that: The invention comprises a grass-planting ditch (1), a sunken green space (2), an environmentally friendly overflow well (3), a multi-stage purification pool (4) and a water collection irrigation system (5); wherein the grass-planting ditch (1) is located near the edge of the road of the sunken green space (2) to receive and transfer rainwater from the road and the green space to the environmentally friendly overflow well (3); a sludge well (31) is provided at the bottom of the overflow well (3), and rainwater precipitated in the sludge well (31) is discharged to the multi-stage purification pool (4) through a pipeline; rainwater purified by the multi-stage purification pool (4) is connected to the water collection irrigation system (5) through a water outlet pipeline, so that the rainwater can be lifted and used for greening irrigation or road washing.

2. The sponge facility rainwater collection, purification and reuse device according to claim 1 is characterized in that: The grass-planting ditch (1) is directly paved outside the flat curbstone and is arranged along the longitudinal direction of the road. A horizontal shallow dish-shaped grass-planting ditch is arranged at the overflow well (3) to communicate with the longitudinal grass-planting ditch. The overflow well (3) is located in the center of the sunken green space (2); The grass-planting ditch (1) has a trapezoidal cross section or an arc-shaped ditch bottom with a concave shape, an upper width of 20 to 30 cm, a depth of 15 cm, an upper end surface flush with the top of the sunken green space (2), and is planted with erosion-resistant grass.

3. The rainwater collection, purification and reuse device for sponge facilities according to claim 1 is characterized in that: The overflow well (3) is composed of a sediment well (31), a well body (32), a well cover (33) and a planting cavity (34) formed by a depression in the middle of the well cover; the sediment well (31) is located at the lower part of the well body (32), and the silt and large particle pollutants in the initial rainwater settle at the bottom of the sediment well.

4. The rainwater collection, purification and reuse device for sponge facilities according to claim 3 is characterized in that: The manhole cover (33) protrudes from the ground, and a water inlet is provided on the side wall. A sewage interception net (11) is provided in the grass-planted ditch at the junction of the water inlet and the grass-planted ditch (1). A sewage interception net is provided on the top of the inner side wall of the manhole to block larger fallen leaves, garbage and debris in the rainwater. A plurality of guide plates (35) are arranged on the water inlet, one end of which extends to the side wall of the overflow manhole cover, and the other end is connected to the outer wall of the planting cavity. Plants are planted inside the planting cavity to form a miniature rain garden, and a ventilation pipe (36) is connected to the bottom and is connected to the overflow manhole. A rainwater drainage pipe is connected to the side wall of the overflow manhole 10 cm away from the top, and is connected to the multi-stage purification tank.

5. The rainwater collection, purification and reuse device for sponge facilities according to claim 1 is characterized in that: The multi-stage purification pool (4) is divided into a filter pool (41), a sinking pool (42), an ecological pool (43) and a water outlet pool (44) by a partition, a grid filter (411) is arranged at the bottom of the filter pool partition, and an overflow weir (421) is arranged at the top of the sinking pool and the ecological pool partition.

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