Ecological drainage recycling system for sponge city construction

Abstract

The utility model discloses an ecological drainage recycling system for sponge city construction. The ecological drainage recycling system comprises a sewage interception treatment area, a rainwater garden treatment area, a gravel drainage transfer area, a rainwater wetland treatment area and a rainwater recycling area which are sequentially arranged in a rainwater runoff direction and a rainwater vertical infiltration direction, the rainwater garden treatment area comprises first backwashing pipes which are arranged from top to bottom and are communicated with the gravel drainage transfer area; the gravel drainage transfer area comprises second permeable geotextile and a gravel drainage layer wrapped by the second permeable geotextile; the rainwater wetland treatment area comprises front ponds and water distribution gabions which are alternately arranged, a water outlet pond is arranged behind the water distribution gabions, and the water outlet pond is communicated with the rainwater recycling area; the rainwater recycling area comprises a water storage module, a second backwashing pipe is arranged between the rainwater recycling area and the water outlet pool, and a backwashing pump and a lifting pump are arranged in the water storage module. According to the ecological drainage recycling system for sponge city construction, the hydraulic retention time can be prolonged, the rainwater runoff pollutant treatment effect is good and stable, the facility performance cannot be damaged due to rainwater washing and overlarge pollution load, and ecological drainage and resource utilization can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sponge city construction and ecological environment technical field especially relates to an ecological drainage recycling system for sponge city construction. BACKGROUND

[0002] Under the background of global water resource shortage, actively developing and utilizing rainwater resource is one of important paths for city construction to improve the level of resilience and realize sustainable development. Rainwater resource is an important link of city water cycle, and plays a very key role in improving city ecological environment and effectively relieving water resource shortage. At the same time, rainwater runoff pollutants caused by rainwater scouring ground flow into nearby surface water during rainfall, which leads to long-time pollution of surface water and poor sustainability of surface water environmental quality. In order to realize the goals of reducing rainwater runoff pollution, relieving water resource shortage and improving water quality type shortage, domestic and foreign countries have carried out relevant researches on rainwater ecological drainage and resource recycling utilization through construction of sponge city in city development and construction process, and biological retention facilities and rainwater wetland are one of efficient treatment facilities for realizing rainwater ecological drainage and resource recycling utilization.

[0003] Rainwater garden and rainwater wetland purify rainwater through adsorption and degradation of plant, soil and microbial system, and are rainwater runoff pollution treatment and recycling facilities based on ecological concept. However, the current traditional sponge construction technology design is rough, and there are problems such as unstable treatment effect of rainwater runoff pollutants by sponge facilities, low utilization level of ecological drainage facilities and insufficient rainwater resource recycling rate. CONTENT

[0004] The utility model solves the technical problems that the utility model provides an ecological drainage recycling system for sponge city construction, can prolong the hydraulic retention time, has good and stable rainwater runoff pollutant treatment effect, will not damage the facility performance due to rainwater scouring and excessive pollution load, and can realize ecological drainage and resource utilization.

[0005] The utility model solves the technical problems by adopting the following technical scheme: an ecological drainage recycling system for sponge city construction, which comprises a sewage interception treatment area, a rainwater garden treatment area, a gravel drainage transfer area, a rainwater wetland treatment area and a rainwater recycling area arranged in sequence in the direction of rainwater runoff and the vertical infiltration direction of rainwater; the rainwater garden treatment area comprises a first backwashing pipe arranged from top to bottom and communicated with the gravel drainage transfer area; the gravel drainage transfer area comprises a second water-permeable geotextile and a gravel drainage layer covered by the second water-permeable geotextile; the rainwater wetland treatment area comprises a pre-pond and a water distribution stone cage arranged alternately, a water outlet pool is arranged behind the water distribution stone cage, and the water outlet pool is communicated with the rainwater recycling area; the rainwater recycling area comprises a water storage module, a second backwashing pipe is arranged between the rainwater recycling area and the water outlet pool, and a backwashing pump and a lifting pump are arranged in the water storage module.

[0006] Further, in order to pretreat large-particle pollutants, the sewage interception treatment zone comprises a sewage interception basket, and the sewage interception basket is internally provided with steel slag filter material.

[0007] Further, in order to remove suspended solids and nitrogen and phosphorus pollutants in runoff rainwater, the rain garden treatment zone further comprises, in sequence along a vertical rainwater infiltration direction, a vegetation layer, a first steel slag filter material layer, a replacement planting soil layer, a first water-permeable geotextile and a first gravel drainage layer, and the first backwashing pipe penetrates through each layer from top to bottom.

[0008] Further, in order to enable the rain garden to maintain long-term stable sewage interception and purification capacity, the lower end of the first backwashing pipe is connected with a first blind pipe leading to the gravel drainage transfer zone.

[0009] Further, in order to improve the sewage interception and purification capacity, the pre-pond and the water distribution stone cage are arranged in a corrugated manner.

[0010] Further, in order to deeply intercept and purify runoff rainwater, the effluent tank comprises, in sequence along a vertical rainwater infiltration direction, an aquatic plant layer, a second steel slag filter material layer, a third water-permeable geotextile and a second gravel drainage layer, and the second gravel drainage layer is internally provided with a second blind pipe communicating with a water storage module.

[0011] Further, in order to realize ecological drainage, the second blind pipe is provided with a water quality and quantity integrated monitoring device.

[0012] Further, in order to realize ecological drainage and resource utilization, the second backwashing pipe is connected with the second blind pipe, and an electric butterfly valve is arranged on the connection part of the two.

[0013] Compared with the prior art, the ecological drainage and reuse system for sponge city construction has the following beneficial effects:

[0014] 1. The ecological drainage and reuse system for sponge city construction is processed in a partitioned and layered manner according to the rainwater runoff direction, the hydraulic retention time is prolonged, the rainwater runoff pollutant treatment effect is good and stable, and the performance of the facility will not be damaged due to rainwater scouring and excessive pollution load.

[0015] 2. The ecological drainage and reuse system for sponge city construction replaces the traditional rainwater pipe material drainage and transfer through the gravel drainage transfer zone, can reduce the use of traditional rainwater drainage pipe materials, and can also purify and reduce nitrogen and phosphorus pollutants in rainwater.

[0016] 3. The ecological drainage and reuse system for sponge city construction realizes ecological drainage and resource recycling after rainwater is subjected to sewage interception, purification and degradation treatment. BRIEF DESCRIPTION OF DRAWINGS

[0017] The utility model is further explained in connection with the drawings and examples.

[0018] Figure 1 It is the structural diagram of ecological drainage reuse system for sponge city construction of the utility model;

[0019] Figure 2 It is the structural diagram of sewage interception treatment area;

[0020] Figure 3 It is the structural diagram of rainwater garden treatment area;

[0021] Figure 4 It is the structural diagram of gravel drainage transfer area;

[0022] Figure 5 It is the structural diagram of rainwater wetland treatment area;

[0023] Figure 6 It is the structural diagram of rainwater reuse area;

[0024] In the drawing: 1, sewage interception treatment area, 11, sewage hanging basket, 12, steel slag filter material;

[0025] 2, rainwater garden treatment area, 21, vegetation layer, 22, first steel slag filter material layer, 23, replacement planting soil layer, 24, first water permeable geotextile, 25, first gravel drainage layer, 26, first backwashing pipe, 27, first blind pipe;

[0026] 3, gravel drainage transfer area, 31, second water permeable geotextile, 32, gravel drainage layer;

[0027] 4, rainwater wetland treatment area, 41, pre-set pond, 42, water distribution stone cage, 43, water outlet pool, 431, aquatic plant layer, 432, second steel slag filter material layer, 433, third water permeable geotextile, 434, second gravel drainage layer, 44, second blind pipe, 45, second backwashing pipe, 46, electric butterfly valve, 47, water quality and water quantity integrated monitoring device;

[0028] 5, rainwater reuse area, 51, water storage module, 52, backwashing pump, 53, lifting pump. DETAILED DESCRIPTION

[0029] The utility model will be further explained in connection with the drawings. These drawings are all simplified schematic diagrams, just with the schematic way of expression basic structure of the utility model, therefore it just shows the constitution related with the utility model.

[0030] In the description of the utility model, it is necessary to understand that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. In addition, the features limited by "first" and "second" can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0031] In the description of the utility model, it should be explained that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] As shown in Figure 1 An ecological drainage and reuse system for sponge city construction, comprising a sewage interception treatment area 1, a rainwater garden treatment area 2, a gravel drainage transfer area 3, a rainwater wetland treatment area 4 and a rainwater reuse area 5 arranged in turn in the direction of rainwater runoff and the vertical infiltration direction of rainwater.

[0033] As shown in Figure 2 The sewage interception treatment area 1 adopts sewage interception basket 11 and steel slag filter material 12 structure along the vertical infiltration direction of runoff rainwater, and the steel slag filter material 12 is arranged in the sewage interception basket 11. The runoff rainwater is pretreated to remove large particle pollutants. The sewage interception basket 11 is made of PE polyethylene material; the thickness of the steel slag filter material 12 is 200mm, and the particle size of the steel slag is 30mm-50mm.

[0034] As shown in Figure 3As shown, the rain garden treatment area 2 includes a vegetation layer 21, a first steel slag filter layer 22, a replacement planting soil layer 23, a first permeable geotextile 24, a first gravel drainage layer 25, and a first backwash pipe 26 arranged from top to bottom and connected to the gravel drainage transfer area 3. The lower end of the first backwash pipe 26 is connected to a first blind pipe 27 leading to the gravel drainage transfer area 3. The rain garden treatment area 2 can intercept and purify runoff rainwater, removing suspended solids and nitrogen and phosphorus pollutants from the rainwater. The first backwash pipe can be backwashed periodically to maintain the stable interception and purification capacity of the rain garden treatment area 2.

[0035] The vegetation layer 21 is planted with suitable plants, such as hosta, bermudagrass, pampas grass, foxtail grass, sweet flag, small-leaved privet, small-leaved boxwood, and red-leaved photinia; the first steel slag filter layer 22 is 30mm thick, with steel slag particles ranging from 30mm to 50mm in diameter; the replacement planting soil layer 23 is 500mm thick, and the mixed filler includes, by weight percentage, 3% medium coal slag, 2% peat moss, 50% coarse sand, and 45% landscape planting soil; the first permeable geotextile 24 is not less than 2.0mm thick and has a density of 200g / m³. 2 The vertical permeability coefficient is not less than 6×10 － 2 cm / s, tensile strength not less than 10KN / m, CBR puncture strength not less than 1.8KN; the first gravel drainage layer 25 is 300mm thick, the gravel particle size is 10mm-30mm, the first blind pipe 27 is a DN100 PE polyethylene pipe with an opening rate of 12%; the first backwash pipe 26 is a DN100 PE polyethylene pipe.

[0036] like Figure 4 As shown, the gravel drainage transfer zone 3 includes a second permeable geotextile 31 and a gravel drainage layer 32 covered by the second permeable geotextile 31. The treated runoff rainwater undergoes further contact purification to reduce nitrogen and phosphorus pollutants before being transferred to the rainwater wetland treatment zone 4. This gravel drainage transfer replaces the traditional rainwater pipe drainage function, reducing the use of traditional rainwater drainage pipes. The second permeable geotextile 31 has a thickness of not less than 2.0 mm and a density of 200 g / m³. 2 The vertical permeability coefficient is not less than 6×10 －2 cm / s, fracture strength not less than 10KN / m, CBR puncture strength not less than 1.8KN; the thickness of the crushed stone drainage layer 32 is 400mm, and the gravel particle size is 10mm-30mm.

[0037] like Figure 5As shown, the rainwater wetland treatment area 4 includes alternating pre-treatment ponds 41 and distribution gabions 42. An outlet pool 43 is located behind the distribution gabions 42, and the outlet pool 43 connects to the rainwater reuse area 5. In this embodiment, two pre-treatment ponds 41 and two distribution gabions 42 are arranged in a corrugated pattern, alternating at different heights. Aquatic plants are planted at the bottom of the pre-treatment ponds 41, the distribution gabions 42 use gravel and steel slag filter media, and the outlet pool 43 is located perpendicular to the infiltration direction of the runoff rainwater.

[0038] The effluent pool 43 includes an aquatic plant layer 431, a second steel slag filter layer 432, a third permeable geotextile 433, and a second gravel drainage layer 434 arranged sequentially along the vertical infiltration direction of rainwater. A second blind pipe 44, connected to the water storage module 51, is installed within the second gravel drainage layer 434. A second backwash pipe 45 is connected to the second blind pipe 44, and an electric butterfly valve 46 is installed at the connection point. Regular backwashing of the second backwash pipe 45 maintains the rainwater wetland's long-term stable interception and purification capacity, deeply intercepting and purifying runoff rainwater to remove suspended solids, nitrogen, phosphorus, and other pollutants.

[0039] The aquatic plant layer 431 is planted with suitable aquatic plants, such as aquatic iris, yellow iris, water onion, rush, hydrangea, goldfish algae, and foxtail algae; the second steel slag filter layer 432 is 100mm thick, with steel slag particles ranging from 30mm to 50mm in diameter; the third permeable geotextile 433 is at least 2.0mm thick and has a density of 200g / m³. 2 The vertical permeability coefficient is not less than 6×10 －2 cm / s, tensile strength not less than 10KN / m, CBR puncture strength not less than 1.8KN; the second gravel drainage layer 434 has a thickness of 300mm, gravel particle size of 10mm-30mm, the second blind pipe 44 adopts DN100 PE polyethylene pipe with an opening rate of 12%; the second backwash pipe 45 adopts DN100 PE polyethylene pipe.

[0040] The second blind pipe 44 is equipped with an integrated water quality and quantity monitoring device 47. After being intercepted, purified, and degraded by the rain garden-wetland composite system, it achieves ecological drainage, which is used for infiltration to replenish groundwater in the outlet pool 43.

[0041] like Figure 6 As shown, the rainwater reuse area 5 includes a water storage module 51, which is equipped with a backwash pump 52 and a lift pump 53. The backwash pump 52 and lift pump 53 can return water from the water storage module 51 to the second backwash pipe 45. The water storage module 51 is a buried PPB block copolymer polypropylene water storage module. It collects rainwater that has undergone interception, purification, and degradation treatment by the rain garden-wetland composite system, achieving ecological drainage and resource utilization. On one hand, it serves as a recycled water source for greening irrigation and road watering; on the other hand, it serves as a backwash water source for the backwash pipes in the rain garden and rain wetland.

[0042] The utility model discloses an ecological drainage recycling system for sponge city construction, intercepts sewage and handles area 1, removes large particle pollutants to the pre -treatment of runoff rainwater, rainwater garden treatment area 2 removes suspended solids, nitrogen and phosphorus pollutants to runoff rainwater further intercepts sewage and purifies, regularly backflushing makes rainwater garden keep long -term stable sewage -purification capacity, gravel drainage transfer area 3 removes suspended solids, nitrogen and phosphorus pollutants to runoff rainwater further contact purification reduction after being handled, and is transferred into rainwater wetland treatment area 4, reduces the use of traditional rainwater drainage pipe material, rainwater wetland treatment area 4 removes suspended solids, nitrogen and phosphorus pollutants regularly backflushing makes rainwater wetland keep long -term stable sewage -purification capacity. The rainwater that is handled after intercepting sewage, purifying and degrading is used for infiltration recharge groundwater in rainwater wetland area outlet pool, and is used for greening irrigation, road sprinkling in rainwater recycling area 5. The utility model has the advantages of stable rainwater runoff pollutant treatment effect, high ecological drainage facility utilization level and high rainwater resource recycling rate, and the rainwater after being handled can realize rainwater ecological drainage and resource recycling.

[0043] In conclusion, the ecological drainage recycling system for sponge city construction can prolong the hydraulic retention time, has good and stable rainwater runoff pollutant treatment effect, will not damage the facility performance due to rainwater scouring and excessive pollution load, and can realize ecological drainage and resource utilization.

[0044] According to the ideal embodiments of the utility model, the related personnel can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of the utility model is not limited to the content in the specification, and must be determined by the scope of the claims.

Claims

1. An ecological drainage and reuse system for sponge city construction, characterized in that, The rainwater runoff direction and the rainwater vertical infiltration direction are sequentially arranged in the sewage interception treatment area (1), the rainwater garden treatment area (2), the gravel drainage transfer area (3), the rainwater wetland treatment area (4) and the rainwater reuse area (5). The rainwater garden treatment area (2) comprises a first backwashing pipe (26) arranged from top to bottom and communicated with the gravel drainage transfer area (3). The gravel drainage transfer area (3) comprises a second water-permeable geotextile (31) and a gravel drainage layer (32) covered by the second water-permeable geotextile (31). The rainwater wetland treatment area (4) comprises a pre-pond (41) and a water distribution stone cage (42) arranged alternately, and a water outlet pool (43) is arranged behind the water distribution stone cage (42), and the water outlet pool (43) is communicated with the rainwater reuse area (5). The rainwater reuse area (5) comprises a water storage module (51), and a second backwashing pipe (45) is arranged between the rainwater reuse area (5) and the water outlet pool (43), and the water storage module (51) is provided with a backwashing pump (52) and a lifting pump (53). 2.The ecological drainage and reuse system for sponge city construction of claim 1, wherein, The sewage interception treatment area (1) comprises a sewage interception basket (11), and the sewage interception basket (11) is provided with a steel slag filter material (12). 3.The ecological drainage and reuse system for sponge city construction of claim 1, wherein, The rainwater garden treatment area further comprises a vegetation layer (21), a first steel slag filter material layer (22), a replacement planting soil layer (23), a first water-permeable geotextile (24) and a first gravel drainage layer (25) arranged in the rainwater vertical infiltration direction, and the first backwashing pipe (26) penetrates through each layer from top to bottom. 4.The ecological drainage and reuse system for sponge city construction of claim 3, characterized in that, The lower end of the first backwashing pipe (26) is connected with a first blind pipe (27) leading to the gravel drainage transfer area (3). 5.The ecological drainage and reuse system for sponge city construction of claim 1, wherein, The pre-pond (41) and the water distribution stone cage (42) are arranged in a corrugated shape. 6.The ecological drainage and reuse system for sponge city construction of claim 5, wherein, The water outlet pool (43) comprises a water plant layer (431), a second steel slag filter material layer (432), a third water-permeable geotextile (433) and a second gravel drainage layer (434) arranged in the rainwater vertical infiltration direction, and the second gravel drainage layer (434) is provided with a second blind pipe (44) communicated with the water storage module (51). 7.The ecological drainage and reuse system for sponge city construction of claim 6, characterized in that, The second blind pipe (44) is provided with a water quality and quantity integrated monitoring device (47). 8.The ecological drainage and reuse system for sponge city construction of claim 7, wherein, The second backwashing pipe (45) is connected with the second blind pipe (44), and an electric butterfly valve (46) is arranged on the connection part of the two.

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