JP6670419B2 - Spiral sunken green belt for efficient runoff pollutant reduction - Google Patents

Description

  The present invention relates to the field of stormwater pollution control, and more specifically, to a spiral sunken green belt that efficiently reduces runoff pollutants.

  Pollution from rainfall runoff is the most important non-point source pollution at this time, and the randomness of its occurrence and the uncertainty of pollutants are increasingly attracting attention from governments around the world, and many Pollution of humans and materials has been studied in a variety of ways. Depending on the source of pollutants, pollution from rainfall spills can include pollution from urban spills, pollution from agricultural production, pollution from livestock manure in rural areas, pollution from landslides in forests, and pollution from landslides in mines and construction sites. It can be divided into other types of pollution.

  With the remarkable acceleration of urbanization and the continued expansion of urban size in China, urban rainfall runoff is the third largest source of pollution, such as urban rivers and lakes receiving water. In agricultural production activities, all kinds of pollutants in agricultural land flow to various water bodies due to surface runoff, agricultural land drainage, and soil infiltration under the influence of rainfall and irrigation. According to a survey by the United States Environmental Protection Agency, 47% of total surface phosphorus and 52% of total nitrogen are from agricultural spills.

  In recent years, research on treatment methods such as artificial wetland systems, rapid infiltration systems, and soil aquifer treatment systems, and reduction of surface water pollution and pollution caused by rainfall runoff in urban and rural areas has been attracting attention. Sancun Greenbelt is a public green space with an altitude lower than the surrounding road surface.The idea is to use open space to undertake and store rainwater, thereby reducing spills and discharges. Sunken Greenbelt has the effect of replenishing groundwater, controlling runoff, restraining flooding, and reducing run-off pollutants. With the development of sponge cities, Sunken Greenbelt has been studied with increasing attention, for example, Patent Application No. 2013102406888.6, "Sangkun Greenbelt suitable for mountain city flushing spill treatment" The entitled Chinese invention patent includes a baffle rotation shaft and a baffle spring provided at the front end of the turning concrete wall, a waterproof flap attached to the baffle rotation shaft, and the waterproof flap is bent at the baffle rotation shaft and one of the waterproof flaps. Is located in the rainwater drain and the other at the groundwater inlet of the Sunken Greenbelt, providing early and mid-term rain and moisture flow into the Sunken Greenbelt, and helping the Sunken Greenbelt from the destruction of torrential rain. The application number is 201610078156.0. A Chinese invention patent entitled "Sunkun Greenbelt to Reduce Initial Rainwater Runoff Pollution in Urban Areas" includes the design of multiple impermeable walls and openings across each impermeable wall. -Disclosed the strengthening of green belt surface run-off pollutants.

  Despite increasing research on the Sunken Greenbelt, each of the existing Sunken Greenbelts is capable of handling some of the effluent contaminants from rainfall, but still has obvious shortcomings and deficiencies. However, the above-mentioned technical solutions do not comprehensively absorb the pollutants, have insufficient water regulation, and have insufficient filtration and absorption of the pollution.

1. Technical issues to be solved In view of the problem that the absorption of contaminants existing in existing technologies is not comprehensive, the water volume is insufficiently adjusted, and the filtration and absorption of pollution are insufficient. Further, the present invention is a spiral sunken green belt that efficiently reduces run-off pollutants, has many types of pollution absorption, has a reasonable water amount adjustment, and has an effect that filtration and absorption can be sufficiently performed.

2. Technical Solution The object of the present invention is achieved by the following technical solution.
Spiral sunken green belts that effectively reduce run-off pollutants include spiral sunken green belts and impermeable filtration walls.

  Further, the spiral sunken green belt includes a spiral plant belt and a bottom plant belt.

  Further, the impermeable filtration wall has an inverted truncated cone shape, and the impermeable filtration wall is composed of a gravel layer arranged in order from the outside to the inside in the radial direction, and / or a ceramic site layer, and a zeolite layer 2. ~ 3 layers of stone bed filtration walls that filter effluents contaminated by layers of stone with different particle sizes and porosity for the three materials. First, intercept large solid contaminants so that the filter walls are not clogged by contaminants, then gradually filter small contaminants, and eventually contaminated effluents -Flows into the green belt plant belt for further interception and filtration of contaminants.

  Further, aquatic plants are planted on the spiral plant belt and the bottom plant belt, and the aquatic plants are selected from plants having strong nitrogen absorption and phosphorus absorption capabilities and strong water purification capabilities.

  In addition, the spiral plant belt has a vertical gradient of 8 ° to 10 ° per half turn, and all of the rainwater and the upstream surface runoff under gravity are excessively discharged and infiltrated using the spiral plant belt as a movement trajectory. Thus, the spiral plant belt can improve the ability to reduce run-off pollutants from upstream of the Sunken Green Belt by greatly extending the permeation time and permeation path of the incoming water.

  Further, the filling material of the bottom plant belt is an artificial backfill soil layer, a nonwoven geotextile cushion layer, a gravel layer, a nonwoven geotextile cushion layer, and a stone layer in order from top to bottom, and the stone layer is from top to bottom. It is composed of two or three types of stone grains having different materials in order.

  Further, the stone layer is composed of a zeolite layer and / or a seramsite layer and a gravel layer in order from top to bottom.

  Further, the non-woven geotextile cushion layer is made of a geotextile obtained by combining a needle punched nonwoven fabric and a PE film.

  In addition, the impervious filter walls have drainage pipes distributed evenly along the direction of infiltration of the water flow.If there is too much natural water and the water flow in the Sunken Greenbelt cannot catch up with the infiltration, the drainage pipe will collect water. Water was immediately drained, improving the service life and environmental adaptability of Sunken Greenbelt.

  In addition, HDPE water-permeable bellows is selected and used for drainage pipes.Compared with soft spring drainage pipes, HDPE water-permeable bellows has strong corrosion resistance, and at the same time, the double corrugated structure effectively increases the compressive strength of drainage pipes. It can be improved and the drainage system is deformed by external pressure and does not affect drainage.

3. Effects of the present invention The advantages of the present invention over the prior art are as follows.
(1) The present invention is to design a spiral plant belt on a slope to extend a surface contamination runoff and natural water infiltration route and permeation residence time in the Sunken Green Belt, and thus the Sunken Green Belt plant belt. It can play a sufficient role in the adsorption and interception of pollutants, increase the reduction rate of pollutants, and reduce the hydraulic load of rainwater runoff pollution in urban areas and rural areas in the early and middle stages.

  (2) The spiral green plant belt can extend the water holding time of the Sunken Green Belt, increase the water penetration of the Sunken Green Belt, and improve the water storage capacity of the Sunken Green Belt. It has helped to reduce drainage pressure and reduce peak flood discharge downstream.

  (3) The inverted circular tape-shaped impermeable filtration wall designed in the present invention is made of two or three layers of different materials having different particle sizes, and stones having a large porosity are located on the outermost side. Intercept large solid contaminants so that the walls are not clogged with contaminants, then gradually filter the small contaminants, eventually contaminating the effluent from the Sunken Greenbelt To further intercept and filter contaminants. The filtration is hierarchical and the filtration effect is good.

  (4) In the present invention, an aquatic plant is planted on the spiral plant belt and the bottom plant belt, and the aquatic plant is a plant having a strong nitrogen / phosphorus absorption ability and a strong water purification ability such as aquatic canna and cress. Selected, the filtration and purification effect is good.

  (5) The spiral plant belt has a vertical gradient of 8 ° to 10 ° per half turn, and all of the rainwater and the upstream surface runoff under gravity flow excessively through the spiral plant belt as a movement trajectory and infiltrate. The helical plant belt can thus increase the permeation time and permeation path of the incoming water, thereby improving the ability to reduce run-off pollutants from upstream of the Sunken Green Belt.

  (6) The non-woven geotextile cushion layer is made of a geotextile that combines a needle-punched nonwoven fabric and a PE film. A path can be formed to discharge liquid and gas remaining in the soil layout to the outside.

  (7) Drainage pipes are evenly distributed along the infiltration direction of the water flow in the impermeable filtration wall. If there is too much natural water and the water flow in the Sunken Greenbelt cannot catch up with the infiltration, The stored water was immediately drained, improving the service life and environmental adaptability of Sunken Greenbelt.

  (8) HDPE water-permeable bellows is selected and used for the drainage pipe. Compared with soft spring drainage pipe, HDPE water-permeable bellows has strong corrosion resistance and the double corrugated structure is effective for compressive strength of drainage pipe. The drainage system is deformed by external pressure and does not affect drainage.

FIG. 1 is a schematic sectional view of a spiral sunken green belt according to the present invention. FIG. 2 is a schematic diagram of the three-dimensional structure of the spiral sunken green belt according to the present invention. FIG. 3 is a top view of the spiral sunken green belt according to the present invention. FIG. 4 is a schematic view of a partial structure of the gravel layer according to the present invention.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and detailed embodiments.

Example 1
Despite increasing research on Sunken Greenbelt, each of the existing Sunken Greenbelts is capable of handling some of the runoff contaminants due to rainfall, but still has obvious disadvantages: And lack. (1) The existing Sunken Green Belt does not contribute to the function of absorbing and utilizing specific polluting elements by vegetation because it does not target specific aquatic plants that have a significant effect on water purification. (2) Existing Sunken Green Belts have a short hydraulic retention time and do not contribute to the complete absorption and filtration of contaminants by plant and soil fillers; The belt does not contribute to the accumulation of rainwater and the adjustment of flood peak discharge downstream.

  The present invention is a helical sunken green belt that efficiently reduces run-off pollutants, has many types of pollution absorption, has a reasonable water flow adjustment, and has an effect that filtration and absorption can be sufficiently performed.

  As shown in FIG. 1-4, the spiral sunken green belt for efficiently reducing the run-off pollutant includes a spiral sunken green belt 1 and a water impervious filtration wall 2 and has a shielding function. The water filtration wall 2 has an inverted truncated cone shape, and the spiral sunken green belt 1 includes a spiral plant belt 3 and a bottom plant belt 4. The design elevation of the spiral sunken green belt 1 is 250 mm lower than the surrounding road surface, and aquatic plants are planted on the spiral plant belt 3 and the plant belt 4 at the bottom of the sunken green belt. Aquatic canna and cress with strong nitrogen and phosphorus absorption capacity and high water purification capacity.

  The spiral plant belt 3 is designed to have a vertical gradient of 8 ° to 10 ° every half turn. Here, the vertical gradient of the spiral plant belt 3 is designed to be 10 ° every half turn, and when the surface runoff from the upstream and the rainwater flow through the spiral Sunken Green Belt under gravity, the spiral gradient is all spiral. The spiral plant belt 3 is run off from the upstream of the Sunken Green Belt by extending the permeation time and permeation path of the inflowing water greatly by spirally overflowing and permeating spirally with the plant belt as a movement locus. The ability to reduce pollutants can be improved.

  Under the plant belt 4 at the bottom of the Sunken Green Belt, an artificial backfill soil layer 10 having a height of 300 mm and having good water permeability is backfilled, and a sand layer 30 mm high below the artificial backfill soil layer 10. 11 is backfilled, a stone layer 12 is located below the sand layer 11, and the stone layer 12 is composed of a zeolite layer 7, a ceramic site layer 6, and a gravel layer 5 in order from top to bottom. The nonwoven geotextile mat 9 is laid between fillers of different materials, or the nonwoven geotextile mat 9 is laid between the sand layer 11 and the stone layer 12. The geotextile that combines needle punched non-woven fabric and PE film has a specification of non-woven fabric and PE film of 1: 1 and non-woven fabric and PE film of 2: 1. The main raw materials are polyester staple fiber needle-punched non-woven fabric and PE film. It is compounded and its main use is to prevent penetration. The PE film composite geotextile allows water to flow, while the needle-punched non-woven fabric has an excellent water guiding function, forms a drainage channel inside the soil, and discharges liquid and gas remaining in the soil layout to the outside At the same time, there can be no runoff of soil between the two different materials. At the bottom of the stone layer 12, two vertical drainage pipes 8 are arranged, and when there is too much natural water and the water flow in the Sunken Green Belt cannot catch up with the infiltration, it is immediately drained by the drainage pipes 8 and the Sunken Green is discharged. The service life and environmental adaptability of the belt have been improved.

  The impermeable filtration wall 2 is a two to three stone particle filtration wall composed of a gravel layer 5 and / or a ceramic site layer 6 and a zeolite layer 7 arranged in order from the outside to the inside in the radial direction. In the present invention, the gravel layer 5, the ceramic site layer 6, and the zeolite layer 7 are arranged in order from the outside to the inside, and the thickness of each layer is 20 mm. With the smallest zeolite layer 7 on the innermost side and the serumite layer 6 on the middle, the contaminated effluent from the upstream enters the Sunken Green Belt, first passing through the inverted circular staple-shaped impermeable filter wall 2. 3. Filter the effluent contaminated by the stone layers with different particle sizes and porosity of the three materials, first by intercepting solid contaminants of large particle size so as not to clog the filter wall with contaminants. The contaminants with the next smaller particle size are then slowly filtered, and eventually the contaminated effluent flows into the Sunken Greenbelt plant belt for further interception and filtration of the contaminants. Nine drain pipes 8 are evenly distributed in the semi-inverted circular waterproof filtration wall on the downstream side in the water flow infiltration direction along the radial direction toward the bus and diametrical direction. In the event that the water flow in the canal was too late for infiltration, the water collected by the drainage pipe was immediately drained, improving the service life and environmental adaptability of the Sunken Greenbelt.

  The impermeable filtration wall 2 is evenly distributed in the drain pipe 8 in the water inflow direction. The drainage pipe 8 is selected from HDPE permeable bellows and used. The drain pipe 8 is made of HDPE permeable bellows with a diameter of 50mm. A strainer is installed at the end of the pipe to prevent clogging of the drain pipe and intercept large pollutants. If HDPE permeable bellows has strong corrosion resistance, the double corrugated structure can effectively improve the compressive strength of the drainage pipe, and the drainage system will be deformed by external pressure and affect the drainage Disappears.

  While the spiral Sunken Green Belt reduces runoff pollution, the inverted circular table-shaped impermeable filter wall 2 performs rudimentary interception of the run-off pollutant, and the gravel layer 5, the ceramic site layer 6 and the zeolite layer. By means of 7, the ammonia nitrogen removal rate of the reverse circular table-shaped water-impregnated filtration wall 2 reaches about 70%, and at the same time, about 55% of nitrogen and phosphorus can be adsorbed. Spiral plant belts increase the amount of water stored in the Sunken Green Belt and reduce the rate of runoff contaminants by aquatic vegetation such as canna and cress by extending the leaching path, and increase the surface area through the spiral plant belts. The removal of nitrogen and phosphorus effluent amounts to about 65%.

Example 2
As shown in FIG. 1-4, the spiral sunken green belt for efficiently reducing the run-off pollutant includes a spiral sunken green belt 1 and a water impervious filtration wall 2 and has a shielding function. The water filtration wall 2 has an inverted truncated cone shape, and the spiral sunken green belt 1 includes a spiral plant belt 3 and a bottom plant belt 4. The design elevation of the spiral sunken green belt 1 is 250 mm lower than the surrounding road surface, and aquatic plants are planted on the spiral plant belt 3 and the plant belt 4 at the bottom of the sunken green belt. Aquatic canna and iris with strong nitrogen and phosphorus absorption capacity and high water purification capacity.

  The spiral plant belt 3 is designed to have a vertical gradient of 8 ° to 10 ° every half turn. Here, the vertical gradient of the spiral plant belt 3 is designed to be 8 ° every half turn, and when the surface runoff from the upstream and rainwater flow under the gravity through the spiral Sunken Green Belt under gravity, all the spirals are formed. The spiral plant belt 3 is run off from the upstream of the Sunken Green Belt by extending the permeation time and permeation path of the inflowing water greatly by spirally overflowing and permeating spirally with the plant belt as a movement locus. The ability to reduce pollutants can be improved.

  Under the plant belt 4 at the bottom of the Sunken Green Belt, an artificial backfill soil layer 10 having a height of 200 mm and having good water permeability is backfilled, and a sand layer 30 mm high below the artificial backfill soil layer 10. 11 is backfilled, the stone layer 12 below the sand layer 11 is a zeolite layer 7 and a gravel layer 5 in order from top to bottom, and the stone layer 12 has a thickness of 40 mm. A nonwoven geotextile mat 9 is laid between fillers of different materials, or a nonwoven geotextile mat 9 is laid between a sand layer 11 and a stone layer 12. The geotextile that combines needle punched non-woven fabric and PE film has a specification of non-woven fabric and PE film of 1: 1 and non-woven fabric and PE film of 2: 1. The main raw materials are polyester staple fiber needle-punched non-woven fabric and PE film. It is compounded and its main use is to prevent penetration. The PE film composite geotextile allows water to flow, while the needle-punched non-woven fabric has an excellent water guiding function, forms a drainage channel inside the soil, and discharges liquid and gas remaining in the soil layout to the outside At the same time, there can be no runoff of soil between the two different materials. Two vertical drainage pipes 8 are arranged at the bottom of the stone layer 12, and when there is too much natural water and the water flow in the Sunken Green Belt cannot catch up with the infiltration, it is immediately drained by the drainage pipes 8, and the Sunken Green is discharged. The service life and environmental adaptability of the belt have been improved.

  The impervious filtration wall 2 is composed of two to three stone-grain layer filtration walls composed of a gravel layer 5 and / or a ceramic site layer 6 and a zeolite layer 7 arranged in order from the outside to the inside in the radial direction. is there. In the present invention, the gravel layer 5 and the zeolite layer 7 are arranged in order from the outer side to the inner side, and the thickness of each layer is 22 mm, the gravel layer 5 having the largest porosity is the outermost, and the zeolite layer 7 having the smallest porosity is the outermost layer. The innermost, when contaminated spill from the upstream enters the Sunken Green Belt, it first passes through the reverse circular staple-shaped impermeable filter wall 2 and is separated by a stone layer with different particle size and porosity of the two materials. Filter the contaminated effluent layer by layer, first intercepting large particle contaminants to prevent clogging of the filter wall with contaminants, and then gradually filter small particle contaminants. Eventually, the contaminated effluent flows into the Sunken Greenbelt plant belt for further interception and filtration of contaminants. Six drain pipes 8 are evenly distributed in the semi-inverted circular waterproof filtration wall on the downstream side in the water flow infiltration direction along the radial direction toward the bus and diametrical direction, and there is too much natural water, and the sunken green belt In the event that the water flow in the canal was too late for infiltration, the water collected by the drainage pipe was immediately drained, improving the service life and environmental adaptability of the Sunken Greenbelt.

  The impermeable filtration wall 2 is evenly distributed in the drain pipe 8 in the water inflow direction. The drainage pipe 8 is selected from HDPE permeable bellows and used. The drainage pipe 8 is made of HDPE permeable bellows with a diameter of 60mm. A strainer is installed at the tip of the pipe to prevent clogging of the drainage pipe and intercept large pollutants. If HDPE permeable bellows has strong corrosion resistance, the double corrugated structure can effectively improve the compressive strength of the drainage pipe, and the drainage system will be deformed by external pressure and affect the drainage Disappears.

  While the spiral sunken green belt reduces runoff contamination, the reverse circular table-shaped water-impregnated filter wall 2 performs rudimentary interception of the run-off pollutant, and the gravel layer 5 and the zeolite layer 7 The ammonia nitrogen removal rate of the circular table-shaped water-impervious filtration wall 2 reaches about 60%, and at the same time, about 50% of nitrogen and phosphorus can be adsorbed. The spiral plant belt increases the water reserve of the Sunken Green Belt and the reduction rate of runoff contaminants by the aquatic plants Canna and Iris by extending the leaching path, and the surface of the ground via this spiral plant belt The nitrogen and phosphorus removal rate has reached about 60%.

  As described above, the present invention and its embodiments have been schematically described. However, this description is not restrictive, and the present invention can be realized in other specific forms without departing from the essence or basic characteristics of the present invention. be able to. The accompanying drawings show only one embodiment of the present invention, the actual structure is not limited to this, and the notation of the accompanying drawings in the claims is not limited to the claims. Therefore, if a person skilled in the art was inspired to, designed without departing from the purpose of the present invention and unintentionally similar structures and embodiments to this technical solution, all would fall within the protection of this patent. Should be.

  1. Spiral sunken green belt, 2. 2. impermeable filtration wall; 3. spiral plant belt; 4. bottom plant belt; 5. gravel layer; 6. Serumsite layer, 7. zeolite layer, 8. drainpipe, 9. 10. non-woven geotextile cushion; 10. artificial backfill soil layer; Sand layer, 12. Stone layer.

Claims (8)

And the spiral of Sunken green belt (1) and the water barrier filtration wall (2) only contains,
The spiral sunken green belt (1) includes a spiral plant belt (3) and a bottom plant belt (4),
A helical sunken green belt for efficiently reducing run-off pollutants, wherein the helical plant belt (3) has a vertical gradient of 8 ° to 10 ° per half turn . A gravel layer (5) in which the impermeable filtration wall (2) has an inverted truncated cone shape and the impermeable filtration wall (2) is sequentially arranged from the outside to the inside in the radial direction, and / or serum site The runoff pollutant for efficiently reducing run-off pollutants according to claim 1, characterized in that it is a two- or three-layered stone bed filter wall composed of a layer (6) and a zeolite layer (7). Spiral sunken green belt. The helical plant for efficiently reducing run-off pollutants according to claim 2 , characterized in that aquatic plants are planted on the helical plant belt (3) and the bottom plant belt (4). Sunken Greenbelt. The filling material of the bottom plant belt (4) is artificially backfilled in order from top to bottom, a soil layer (10), a nonwoven geotextile cushion layer (9), a sand layer (11), a nonwoven geotextile cushion layer (9), a stone layer (12), said stone layer (12) is characterized in that it consists of different stone grains of 2-3 kinds of materials in order from top to bottom, efficient run-off Pollution tanto according to claim 1 Spiral sunken green belt to reduce the volume. Zeolite layer (7) from top to bottom the stone layer (12), and / or ceramic A site layer (6), characterized by comprising from the gravel layer (5), according to claim 4 Spiral sunken green belt to efficiently reduce runoff pollutants in the car. The helical spiral for efficiently reducing run-off pollutants according to claim 5 , characterized in that the non-woven geotextile cushion layer (9) is made of a geotextile obtained by combining a needle punched nonwoven fabric and a PE film. Sunken Greenbelt. The run-off pollutant according to claim 1, wherein the drainage pipe (8) is evenly distributed along the direction of infiltration of the water flow in the impermeable filtration wall (2). Spiral sunken green belt to do. The spiral sunken green belt for efficiently reducing run-off pollutants according to claim 7 , characterized in that HDPE permeable bellows is used as the drain pipe (8).

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