Rainwater collection and purification facilities

Abstract

The present invention relates to the technical field of urban rainwater treatment, and particularly relates to a rainwater collection and purification facility, which includes a rainwater collection pipe, a filtration tank, and a water outlet pipe disposed under the road surface in the waterfront area, and a surface flow wetland disposed at the edge of the river in the waterfront area. The filtration tank is provided with an inlet connected to the rainwater collection pipe, an outlet connected to the water outlet pipe, and a filtering member disposed between the inlet and the outlet; the rainwater collection pipe introduces surface rainwater into the filtration tank, and the surface rainwater is filtered by the filtering member and then transported to the surface layer of the surface flow wetland through the water outlet pipe. The surface rainwater can be introduced into the filtration tank by the rainwater collection pipe, and after filtering out larger particulate matter and pollutants, it is transported to the surface layer of the surface flow wetland through the water outlet pipe, and then enters the river water flow after flowing through the surface layer of the surface flow wetland. The surface flow wetland can play a role in biological purification of the surface rainwater, and at the same time has the functions of seepage and water storage. Thus, the rainwater collection and purification facility realizes the purification of the rainwater entering the river and the sponge function.

Description

Technical Field

[0001] The present invention relates to the technical field of urban rainwater treatment, and particularly relates to a rainwater collection and purification facility. Background Art

[0002] Due to the hardening of road surfaces caused by the construction of urban roofs, roads, ground and other facilities, most rainfall cannot infiltrate into the ground and forms surface runoff on the hard road surfaces. At present, urban surface rainwater is mainly collected and discharged by municipal rainwater pipe networks. For the surface rainwater on the road surfaces in the waterfront area, it is often directly discharged into the river after being collected by the municipal rainwater pipe network, without the functions of purifying the rainwater entering the river and rainwater storage, which is not conducive to the maintenance of the ecological environment. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a rainwater collection and purification facility with a sponge function and the function of purifying rainwater entering the river, so as to overcome the above-mentioned defects of the prior art.

[0004] To solve the above technical problem, the present invention adopts the following technical solution: A rainwater collection and purification facility includes a rainwater collection pipe, a filtration tank and a water outlet pipe provided under the road surface in the waterfront area, and a surface flow wetland provided at the edge of the waterfront area river. The filtration tank is provided with an inlet connected to the rainwater collection pipe, an outlet connected to the water outlet pipe, and a filter element provided between the inlet and the outlet; the rainwater collection pipe introduces surface rainwater into the filtration tank, and the surface rainwater is filtered by the filter element and then transported to the surface layer of the surface flow wetland through the water outlet pipe.

[0005] Preferably, the rainwater collection pipe is connected to a rainwater grate in the municipal rainwater pipe network.

[0006] Preferably, the bottom of the filtration tank includes a soil base layer and a water-permeable layer laid on the soil base layer.

[0007] Preferably, the water-permeable layer is a water-permeable geotextile.

[0008] Preferably, the filter element is a filler filled in the filtration tank, and the inlet and the outlet are respectively provided at the top and the bottom of the filtration tank.

[0009] Preferably, the filler includes a lower layer, a middle layer and an upper layer laid in sequence from bottom to top, and the particle sizes of the filling materials in the lower layer, the middle layer and the upper layer gradually increase.

[0010] Preferably, the filling material in the lower layer is cobblestone or quartz sand, the filling material in the middle layer is fine gravel or ceramsite, and the filling material in the upper layer is coarse gravel.

[0011] Preferably, the thicknesses of the lower layer, the middle layer and the upper layer are the same.

[0012] Preferably, the thicknesses of the lower layer, the middle layer and the upper layer are all not less than 150 mm.

[0013] Preferably, a wooden stake enclosure is provided on one side of the surface flow wetland facing the center of the river course.

[0014] Compared with the prior art, the present invention has significant progress:

[0015] By using the rainwater collection and purification facility of the present invention, surface rainwater can be introduced into the inlet of the filter tank by the rainwater collection pipe, so that the surface rainwater enters the filter tank from the inlet, then flows through the filter element. After the filter element filters out larger particulate matters and pollutants, it flows out of the filter tank from the outlet and enters the outlet pipe, and then the surface rainwater filtered by the filter tank is transported to the surface layer of the surface flow wetland through the outlet pipe, so that it flows through the surface layer of the surface flow wetland and then enters the river water flow. The surface flow wetland can play a role in biological purification of the flowing surface rainwater, and at the same time has the functions of seepage and water storage. Thus, the rainwater collection and purification facility of the present invention realizes the purification of rainwater entering the river and the sponge function. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic cross-sectional structure view of the rainwater collection and purification facility according to an embodiment of the present invention.

[0017] Among them, the reference numerals are explained as follows:

[0018] 1. Rainwater collection pipe 2. Filter tank

[0019] 201. Soil base layer 202. Permeable layer

[0020] 21. Inlet 22. Outlet

[0021] 23. Filter element 231. Lower layer

[0022] 232. Middle layer 233. Upper layer

[0023] 3. Outlet pipe 4. Surface flow wetland

[0024] 5. Wooden stake enclosure 10. River course

[0025] 100. Waterfront walkway 200. Sidewalk

[0026] 300. Roadway DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following further describes in detail the specific embodiments of the present invention with reference to the drawings. These embodiments are only used to illustrate the present invention and are not intended to limit the present invention.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It 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 should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" 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 mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In addition, in the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0031] As Figure 1 shown, an embodiment of the rainwater collection and purification facility of the present invention. The rainwater collection and purification facility of this embodiment includes a rainwater collection pipe 1, a filtration tank 2, a water outlet pipe 3, and a surface flow wetland 4.

[0032] Among them, the rainwater collection pipe 1, the filtration tank 2, and the water outlet pipe 3 are all arranged under the road surface of the waterfront area, and the surface flow wetland 4 is arranged at the edge of the waterfront river 10.

[0033] The rainwater collection pipe 1 functions to collect the surface rainwater on the road surface of the waterfront area and introduce the collected surface rainwater into the filtration tank 2. Preferably, the rainwater collection pipe 1 can be connected to the rainwater grate in the municipal rainwater pipe network. The rainwater grate is usually set on the road surface, and the surface runoff rainwater on the road will flow into the rainwater grate, and the rainwater collection pipe 1 then transports the surface rainwater flowing into the rainwater grate to the filtration tank 2.

[0034] The filtering pool 2 is used to filter the surface rainwater introduced by the rainwater collection pipe 1 to filter out the larger particles and pollutants in the surface rainwater. The filtering pool 2 is a hollow pool structure, and the filtering pool 2 is provided with an inlet 21, an outlet 22 and a filtering member 23. The inlet 21 of the filtering pool 2 is connected to the rainwater collection pipe 1 for inputting the surface rainwater introduced by the rainwater collection pipe 1. The outlet 22 of the filtering pool 2 is connected to the water outlet pipe 3 for outputting the surface rainwater in the filtering pool 2. The filtering member 23 is arranged inside the filtering pool 2 and between the inlet 21 and the outlet 22 of the filtering pool 2 for filtering the surface rainwater entering the filtering pool 2. The filtering member 23 can filter out the larger particles and pollutants in the surface rainwater.

[0035] The water outlet pipe 3 is used to transport the surface rainwater filtered by the filtering pool 2 to the surface layer of the surface flow wetland 4. The end (i.e., the water outlet end) of the water outlet pipe 3 is located above the surface layer of the surface flow wetland 4. Preferably, the water outlet pipe 3 can be made of polyethylene pipe or Supalon pipe.

[0036] As Figure 1 As shown by the arrow in the figure, by using the rainwater collection and purification facility of this embodiment, the surface rainwater can be introduced from the rainwater collection pipe 1 into the inlet 21 of the filtering pool 2, so that the surface rainwater enters the filtering pool 2 from the inlet 21, then flows through the filtering member 23. After the larger particles and pollutants are filtered out by the filtering member 23, it flows out of the filtering pool 2 from the outlet 22 and enters the water outlet pipe 3. Then, the surface rainwater filtered by the filtering pool 2 is transported to the surface layer of the surface flow wetland 4 through the water outlet pipe 3, and after flowing through the surface layer of the surface flow wetland 4, it enters the water flow of the river channel 10. The surface flow wetland 4 can play a role in biological purification of the flowing surface rainwater, and at the same time has the functions of seepage and water storage. Thus, the rainwater collection and purification facility of this embodiment realizes the purification of the rainwater entering the river and the sponge function.

[0037] In this embodiment, preferably, the outer periphery and the top of the pool body of the filtering pool 2 can adopt a reinforced concrete structure, which has the advantages of stable and reliable structural strength. A maintenance hole can be reserved at the top of the filtering pool 2 for checking and maintaining the filtering pool 2.

[0038] In this embodiment, preferably, the bottom of the filtering pool 2 can include a soil base layer 201 and a permeable layer 202 laid on the soil base layer 201. The soil base layer 201 is a soil layer with a lower compaction coefficient and has better water seepage ability. The permeable layer 202 plays a role in water permeability, so that part of the surface rainwater in the filtering pool 2 can seep downward into the soil base layer 201. Thus, while the filtering pool 2 realizes the filtering function, it also has a certain water seepage function, increasing the overall water seepage ability of the rainwater collection and purification facility of this embodiment. Preferably, the permeable layer 202 can be a permeable geotextile, and the permeable geotextile is laid on the upper surface of the soil base layer 201.

[0039] In this embodiment, preferably, the filter element 23 is the filler filled in the filter tank 2, and the inlet 21 and the outlet 22 of the filter tank 2 are respectively arranged at the top and the bottom of the filter tank 2. The surface rainwater introduced by the rainwater collection pipe 1 enters the filter tank 2 from the inlet 21 at the top of the filter tank 2, then naturally drops, reaches the bottom of the filter tank 2 after passing through the filler in the filter tank 2, and a part of it can penetrate into the soil base layer 201 through the water-permeable layer 202 at the bottom of the filter tank 2, and the other part is output through the outlet 22 at the bottom of the filter tank 2 and enters the outlet pipe 3, and is conveyed by the outlet pipe 3 to the surface layer of the surface flow wetland 4. The filler can play a good filtering role in the surface rainwater entering the filter tank 2, and effectively filter out the larger particles and pollutants in the surface rainwater.

[0040] Preferably, the filler may include a lower layer 231, a middle layer 232 and an upper layer 233 laid in sequence from bottom to top, and the particle sizes of the filling materials of the lower layer 231, the middle layer 232 and the upper layer 233 gradually increase. Thus, it can play a role of gradually filtering the surface rainwater entering the filter tank 2 and falling from top to bottom, and achieve a better filtering effect.

[0041] Preferably, the filling material of the lower layer 231 of the filler can be cobblestones or quartz sand, the filling material of the middle layer 232 of the filler can be fine gravel or ceramsite, and the filling material of the upper layer 233 of the filler can be coarse gravel.

[0042] Preferably, the thicknesses of the lower layer 231, the middle layer 232 and the upper layer 233 of the filler can be set to be the same. Preferably, the thicknesses of the lower layer 231, the middle layer 232 and the upper layer 233 of the filler are not less than 150 mm. In a preferred embodiment, the thicknesses of the lower layer 231, the middle layer 232 and the upper layer 233 of the filler can all be set to 200 mm.

[0043] In this embodiment, preferably, a wooden stake enclosure 5 is arranged on one side of the surface flow wetland 4 facing the center of the river channel 10. The surface flow wetland 4 is an aquatic plant planting area enclosed by the wooden stake enclosure 5 at the edge of the waterfront river channel 10, where plants can be planted, which can not only purify the rainwater entering the river, but also improve the landscape effect of the waterfront area. The surface flow wetland 4 can be in a strip shape extending along the edge of the river channel 10. The wooden stake enclosure 5 can be composed of vertical Chinese fir stakes densely arranged at the edge of the waterfront river channel 10.

[0044] In summary, the rainwater collection and purification facility of this embodiment can be used to achieve the purification of rainwater flowing into the river in the urban waterfront area and the function of sponge-like rainwater collection and drainage. Its application scenarios can be urban waterfront squares, waterfront platforms and other waterfront areas. In such urban waterfront areas, a waterfront walkway 100 (i.e., a hydrophilic platform), a sidewalk 200 and a roadway 300 can be successively arranged on the land area along the direction away from the river 10. When setting the rainwater collection and purification facility of this embodiment in such urban waterfront areas, the water outlet pipe 3, the filter tank 2 and the rainwater collection pipe 1 can be successively arranged under the road surface of the land area along the direction away from the river 10. The water inlet end of the rainwater collection pipe 1 extends to the rainwater grate of the roadway, so that the surface rainwater flowing into the rainwater grate on the road surface can be introduced into the filter tank 2, and the sponge-like rainwater collection and drainage function and the function of purifying rainwater flowing into the river can be jointly realized by the filter tank 2 and the surface flow wetland 4.

[0045] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A rainwater collection and purification facility, characterized in that, it includes a rainwater collection pipe (1), a filtration tank (2), and a water outlet pipe (3) disposed under the road surface in the waterfront area, and a surface flow wetland (4) disposed at the edge of the watercourse (10) in the waterfront area. The filtration tank (2) is provided with an inlet (21) connected to the rainwater collection pipe (1), an outlet (22) connected to the water outlet pipe (3), and a filter element (23) disposed between the inlet (21) and the outlet (22). The rainwater collection pipe (1) introduces surface rainwater into the filtration tank (2). After being filtered by the filter element (23), the surface rainwater is conveyed through the water outlet pipe (3) to the surface layer of the surface flow wetland (4). The surface flow wetland (4) can play a role in biological purification of the flowing surface rainwater, and at the same time has a function of seeping and storing water; the bottom of the filtration tank (2) includes a soil base layer (201) and a permeable layer (202) laid on the soil base layer (201). The filter element (23) is a filler filled in the filtration tank (2). The inlet (21) and the outlet (22) are respectively disposed at the top and bottom of the filtration tank (2). The surface rainwater introduced by the rainwater collection pipe (1) enters the filtration tank (2) from the inlet (21) at the top of the filtration tank (2), then naturally falls, passes through the filler in the filtration tank (2), and reaches the bottom of the filtration tank (2). Part of it penetrates through the permeable layer (202) at the bottom of the filtration tank (2) and seeps into the soil base layer (201), and the other part is output through the outlet (22) at the bottom of the filtration tank (2) and enters the water outlet pipe (3), and is conveyed by the water outlet pipe (3) to the surface layer of the surface flow wetland (4).

2. The rainwater collection and purification facility according to claim 1, characterized in that, the rainwater collection pipe (1) is connected to a rainwater grate in the municipal rainwater pipe network.

3. The rainwater collection and purification facility according to claim 1, characterized in that, the permeable layer (202) is a permeable geotextile.

4. The rainwater collection and purification facility according to claim 1, characterized in that, the filler includes a lower layer (231), a middle layer (232), and an upper layer (233) laid in sequence from bottom to top. The particle sizes of the filling materials of the lower layer (231), the middle layer (232), and the upper layer (233) gradually increase.

5. The rainwater collection and purification facility according to claim 4, characterized in that, the filling material of the lower layer (231) is cobblestone or quartz sand, the filling material of the middle layer (232) is fine gravel or ceramsite, and the filling material of the upper layer (233) is coarse gravel.

6. The rainwater collection and purification facility according to claim 4, characterized in that, the lower layer (231), the middle layer (232), and the upper layer (233) have the same thickness.

7. The rainwater collection and purification facility according to claim 4, characterized in that, the thicknesses of the lower layer (231), the middle layer (232), and the upper layer (233) are all not less than 150 mm.

8. The rainwater collection and purification facility according to claim 1, characterized in that, a wooden pile enclosure (5) is provided on one side of the surface flow wetland (4) facing the center of the river course (10).

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