An improved bioretention facility with anti-deicing agent

Abstract

The present invention discloses an anti-deicing agent improved bioretention facility, comprising: a bioretention facility, wherein a drainage layer, a cation adsorption filling layer and a planting soil layer are sequentially arranged from bottom to top in the bioretention facility; at least one interception ditch, wherein the interception ditch is arranged on the side wall of the bioretention facility, wherein an anion adsorption layer and a water storage layer are sequentially arranged from bottom to top in the interception ditch, wherein the anion adsorption layer is connected to the top of the planting soil layer through a plurality of outlet pipes. The present invention realizes the initial interception and purification of runoff containing deicing agent by applying an anion adsorption layer and a cation adsorption filling layer to the bioretention facility, reduces the salt content of the runoff entering the main body of the bioretention facility, and finally improves the stability of the operation of the bioretention facility under deicing agent stress conditions.

Description

Technical Field

[0001] The invention relates to the technical field of ecological water treatment facilities, and in particular to an anti-icing agent improved bioretention facility. Background Art

[0002] As an ecological water treatment facility, bioretention facilities are widely used for the purpose of regulating and purifying rainwater runoff. However, the hardening of the road surface in winter, especially the use of road deicing agents, introduces a large amount of chloride salts into the bioretention facilities, which are mainly green spaces, causing salinization of the internal matrix of the bioretention facilities, which has significant biological toxicity to the vegetation and microbial communities in the facilities, and even pollutes the groundwater source. At present, traditional bioretention facilities have not taken corresponding technical means to offset the adverse effects of deicing agents on the normal functions of the facilities. Summary of the invention

[0003] In view of the above-mentioned problems existing in the existing bioretention facilities, the present invention aims to provide an improved bioretention facility with resistance to deicing agents. By applying an anion adsorption layer and a cation adsorption filling layer to the bioretention facility, the adsorption capacity of the ion adsorption material for anions and cations in the water body can be fully utilized, and the surface runoff containing deicing agents discharged from the hardened road surface into the facility is discharged. After the chloride ions in the runoff pollutants are removed by the anion adsorption material, the residual deicing agent cations are adsorbed and removed by the cation adsorption material arranged in the matrix, thereby realizing the initial interception and purification of the runoff containing deicing agents, reducing the salt content of the runoff entering the main body of the bioretention facility, and ultimately improving the stability of the operation of the bioretention facility under deicing agent stress conditions.

[0004] The specific technical solutions are as follows:

[0005] An anti-icing agent improved bioretention facility, comprising:

[0006] A bioretention facility, wherein the bioretention facility is provided with a drainage layer, a cation adsorption filling layer and a planting soil layer in order from bottom to top;

[0007] At least one intercepting ditch is arranged on the side wall of the biological retention facility, and an anion adsorption layer and a water storage layer are arranged in the intercepting ditch from bottom to top, and the anion adsorption layer is connected to the top of the planting soil layer through a plurality of outlet pipes.

[0008] The above-mentioned anti-icing agent improved bioretention facility, wherein the bioretention facility is located on the planting soil layer and a surface water retention layer is arranged, and the bottom of the outlet of the water outlet pipe is consistent with the normal water level of the surface water retention layer;

[0009] An overflow rainwater outlet is provided in the biological retention facility, and the top of the wellhead of the overflow rainwater outlet is consistent with the normal water level of the surface aquifer.

[0010] In the above-mentioned anti-icing agent improved bioretention facility, a plurality of grille cover plates are installed on the top of the intercepting ditch, and the plurality of grille cover plates are arranged along the length direction of the intercepting ditch.

[0011] The above-mentioned anti-icing agent improved biological retention facility, wherein the water storage layer includes a plurality of water storage modules, the anion adsorption layer includes a plurality of anion adsorption units, a plurality of the water storage modules are arranged along the longitudinal direction of the intercepting ditch, and a plurality of the anion adsorption units are arranged along the longitudinal direction of the intercepting ditch.

[0012] In the above-mentioned anti-icing agent improved biological retention facility, each of the anion adsorption units is connected to the surface water retention layer through the outlet pipe.

[0013] The above-mentioned anti-icing agent improved biological retention facility, wherein an impermeable membrane is arranged on the peripheral wall of the biological retention facility, and the drainage layer, the cationic adsorption filling layer, the planting soil layer and the surface water retention layer are arranged in sequence from bottom to top in the impermeable membrane, the top of the impermeable membrane is consistent with the normal water level of the surface water retention layer, and a bare soil foundation is arranged at the bottom of the impermeable membrane.

[0014] The above-mentioned anti-icing agent improved biological retention facility, wherein the intercepting ditch includes a pool body, in which the anion adsorption layer and the water storage layer are arranged in sequence from bottom to top, one end of several of the outlet pipes are respectively connected to the anion adsorption layer, and the other ends of several of the outlet pipes respectively pass through the side wall of the pool body and are connected to the surface water retention layer.

[0015] The above-mentioned anti-snowmelt agent improved biological retention facility, wherein permeable geotextiles are provided on the peripheral wall of the anion adsorption layer, the peripheral wall of the water storage layer, between the drainage layer and the cation adsorption filling layer, and between the cation adsorption filling layer and the planting soil layer.

[0016] In the above-mentioned anti-icing agent improved biological retention facility, the anion adsorption layer is a strong base anion exchange resin particle, and the cation adsorption filling layer is a granular activated carbon.

[0017] In the above-mentioned anti-snowmelt agent improved bioretention facility, the water storage layer is porous fiber cotton.

[0018] Compared with the prior art, the above technical solution has the following positive effects:

[0019] The present invention applies ion adsorption materials to traditional biological retention facilities, and can make full use of the adsorption capacity of ion adsorption materials for anions and cations in water bodies. The surface runoff containing deicing agent discharged from the hardened road surface into the facility is first introduced into interception ditches arranged along the longitudinal sides of the biological retention facility, and the runoff pollutants are preliminarily physically absorbed and intercepted by the aquifer prefabricated in the interception ditch. Subsequently, the chloride ions in the runoff are removed by the anion adsorption layer, and then the runoff is discharged into the biological retention facility. While the runoff infiltrates in the biological retention facility, the residual deicing agent cations are adsorbed and removed by the cation adsorption filling layer arranged in the facility, thereby realizing the initial interception and purification of the runoff containing the deicing agent, reducing the salt content of the runoff entering the main body of the biological retention facility, and finally improving the stability of the operation of the biological retention facility under the deicing agent stress condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the plan layout of an improved bioretention facility for anti-icing agents of the present invention;

[0021] Figure 2 The invention provides an improved bioretention facility for anti-snow melting agents Figure 1 Sectional view in the AA direction;

[0022] In the attached figure: 1. Bioretention facility; 2. Intercepting ditch; 5. Overflow rainwater outlet; 6. Permeable geotextile; 11. Drainage layer; 12. Cationic adsorption filling layer; 13. Planting soil layer; 14. Surface aquifer; 15. Salt-tolerant plants; 16. Impermeable membrane; 17. Bare soil foundation; 21. Anion adsorption layer; 22. Aquifer; 23. Grille cover; 24. Pool wall; 31. Outlet pipe; 32. Water curb; 41. Motor vehicle lane; 42. Pedestrian lane. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0024] Figure 1 This is a schematic diagram of the plan layout of an improved bioretention facility for anti-icing agents according to the present invention. Figure 2 The invention provides an improved bioretention facility for anti-snow melting agents Figure 1 The cross-sectional view in the AA direction is as follows: Figure 1 and Figure 2As shown, a preferred embodiment of an anti-icing agent improved bioretention facility is shown, comprising: a bioretention facility 1 and at least one intercepting ditch 2, the bioretention facility 1 is provided with a drainage layer 11, a cation adsorption filling layer 12 and a planting soil layer 13 from bottom to top, the intercepting ditch 2 is arranged on the side wall of the bioretention facility 1, and an anion adsorption layer 21 and a water storage layer 22 are arranged in the intercepting ditch 2 from bottom to top, and the anion adsorption layer 21 is connected to the top of the planting soil layer 13 through a plurality of outlet pipes 31.

[0025] Preferably, intercepting ditches 2 are provided on both sides of the bioretention facility 1 , the side of one intercepting ditch 2 away from the bioretention facility 1 is a motor vehicle lane 41 , and the side of the other intercepting ditch 2 away from the bioretention facility 1 is a slow lane 42 .

[0026] Preferably, a water-passing curbstone 32 is provided on the side of the intercepting ditch 2 close to the motor vehicle lane 41 .

[0027] Preferably, the water-passing curbstone 32 is a prefabricated perforated curbstone made of, but not limited to, concrete, and is disposed between the hardened road surface and the intercepting ditch 2 .

[0028] Furthermore, as a preferred embodiment, the biological retention facility 1 is provided with a surface aquifer 14 on the planting soil layer 13 , and the bottom of the outlet of the water outlet pipe 31 is consistent with the normal water level of the surface aquifer 14 .

[0029] Furthermore, as a preferred embodiment, an overflow rainwater outlet 5 is provided in the biological retention facility 1 , and the top of the wellhead of the overflow rainwater outlet 5 is consistent with the normal water level of the surface aquifer 14 .

[0030] Preferably, the surface aquifer 14 is used to receive the treated water from the interception ditch 2 and the overflow rainwater runoff.

[0031] Preferably, salt-tolerant and flood-tolerant salt-tolerant plants 15 are uniformly planted in the bioretention facility 1 , located on the planting soil layer 13 .

[0032] Preferably, the normal water level depth of the surface aquifer 14 is 5 cm, and the superelevation is controlled to be 20 cm by sloping. The overflow rainwater inlet 5 is arranged in the biological retention facility 1, and the wellhead elevation is consistent with the surface aquifer 14. The internal rainwater connecting pipe is connected to the municipal rainwater pipeline to control the water level in the biological retention facility 1 and transfer excess rainwater.

[0033] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation and protection scope of the present invention.

[0034] The present invention also has the following implementation modes based on the above:

[0035] In further embodiments of the present invention, please continue to refer to Figure 1 , Figure 2As shown, a plurality of grille covers 23 are installed on the top of the intercepting ditch 2 , and the plurality of grille covers 23 are arranged along the length direction of the intercepting ditch 2 .

[0036] In a further embodiment of the present invention, the water storage layer 22 includes a plurality of water storage modules, the anion adsorption layer 21 includes a plurality of anion adsorption units, the plurality of water storage modules are arranged along the longitudinal direction of the intercepting ditch 2, and the plurality of anion adsorption units are arranged along the longitudinal direction of the intercepting ditch 2.

[0037] Preferably, the water storage module is 30 cm high and the anion adsorption unit is 50 cm high.

[0038] In a further embodiment of the present invention, each anion adsorption unit is connected to the surface aquifer 14 via a water outlet pipe 31 .

[0039] In a further embodiment of the present invention, an impermeable membrane 16 is provided on the peripheral wall of the biological retention facility 1, and a drainage layer 11, a cation adsorption filling layer 12, a planting soil layer 13 and a surface water retention layer 14 are arranged in the impermeable membrane 16 from bottom to top. The top of the impermeable membrane 16 is consistent with the normal water level of the surface water retention layer 14, and a bare soil foundation 17 is provided at the bottom of the impermeable membrane 16.

[0040] Preferably, the impermeable membrane 16 is located on the side walls of the bioretention facility 1 and the bottom of the bioretention facility 1 .

[0041] Preferably, the cation adsorption filler layer 12 is located below the planting soil layer 13 and filled with cation adsorption material, the material of which is granular activated carbon, but not limited to this material, and is filled below the planting soil layer 13. The cation adsorption filler layer 12 is coated with a permeable geotextile 6.

[0042] Preferably, the drainage layer 11 is located below the cationic adsorption filler layer 12 to the grass-planted ditch soil foundation 17, filled with gravel with a particle size of 20cm to 50cm, and an anti-seepage membrane 16 is laid at the bottom and around the drainage layer 11 to the normal water level of the surface aquifer 14.

[0043] In a further embodiment of the present invention, the intercepting ditch 2 includes a pool body 24, in which an anion adsorption layer 21 and an aquifer 22 are sequentially arranged from bottom to top, one end of a plurality of outlet pipes 31 are respectively connected to the anion adsorption layer 21, and the other ends of the plurality of outlet pipes 31 respectively pass through the side wall of the pool body 24 and are connected to the surface water stagnant layer 14.

[0044] Preferably, the intercepting ditch 2 is built together with the biological retention facility 1, and is a linear pool body arranged longitudinally along both sides of the biological retention facility 1. The cross-section of the pool body 24 is rectangular, the top of the pool is closed by a grille cover 23, and the pool body 24 is made of brick, but is not limited to this material.

[0045] Preferably, the bioretention facility 1 is a linear surface runoff treatment facility with a rectangular cross-section and two sides connected to the interception ditch 2. Where the underground part of the bioretention facility 1 connects with the plain soil foundation 17, an impermeable membrane 16 is laid to the top of the surface aquifer 14.

[0046] Preferably, the planting soil layer 13 is located at the top of the bioretention facility 1 and is filled with nutrient soil to a depth of 30 cm. The composition ratio is 10% coarse sand, 70% peat and 20% vermiculite, but is not limited to this ratio.

[0047] Preferably, the outlet pipe 31 is located at the bottom of the intercepting ditch 2 and is laid upward through the inner pool wall 24 of the intercepting ditch 2 to the surface aquifer 14 of the biological retention facility 1 .

[0048] Preferably, the grille cover 23 is disposed on the top of the intercepting ditch pool and arranged along the entire line of the intercepting ditch 2. The strength meets the requirements for pedestrians to stand safely. The material is stainless steel, but not limited to this material.

[0049] In a further embodiment of the present invention, a permeable geotextile 6 is provided on the peripheral wall of the anion adsorption layer 21 , the peripheral wall of the water storage layer 22 , between the drainage layer 11 and the cation adsorption filling layer 12 , and between the cation adsorption filling layer 12 and the planting soil layer 13 .

[0050] In a further embodiment of the present invention, the anion adsorption layer 21 is a strong base anion exchange resin particle. Preferably, but not limited to this material, the particle size is 0.5mm-1.0m, and the anion adsorption layer 21 is placed at the bottom of the intercepting ditch 2 and is wrapped with a permeable geotextile 6.

[0051] In a further embodiment of the present invention, the cation adsorption filling layer 12 is granular activated carbon.

[0052] Preferably, the cationic adsorption filler layer 12 is located at the bottom of the planting soil layer 13 , with a depth of 30 cm, and is filled with cationic adsorption material, the material of which is granular activated carbon, and the filler layer is wrapped with a permeable geotextile 6 .

[0053] In a further embodiment of the present invention, the water storage layer 22 is porous fiber cotton. Preferably, but not limited to this material, the water storage module is arranged in the intercepting ditch 2, the upper part of the anion adsorption material is wrapped with a permeable geotextile 6.

[0054] When the system is in operation, the surface rainwater runoff containing snowmelt agent passes through the water curb 32 or flows in a flooding manner from the hardened ground on both sides into the anti-snowmelt agent improved bioretention facility. The rainwater runoff entering the facility is firstly introduced into the interception ditch 2 on both sides, and then passes through the grille cover 23, the aquifer 22 and the anion adsorption layer 21 in sequence. Large impurities and garbage are firstly intercepted on the grille cover 23 and are regularly cleaned and removed. The lower aquifer of the grille cover 23 absorbs and stores the impurities and garbage by utilizing its high porosity and fiber capillary action. Part of the rainwater runoff, and through physical filtration, remove part of the suspended particle pollutants of medium and small particle size runoff and the organic / inorganic sediments attached thereto, and provide conditions for the lower anion adsorption layer 21 to function. When the runoff after preliminary filtration passes through the anion adsorption layer 21, a large amount of chloride ions in the runoff containing snow melting agent are adsorbed and removed through the ion exchange effect of the surface active groups of the material, and the treated effluent is discharged into the surface aquifer 14 of the biological retention facility 1 through the outlet pipe 31 at the bottom of the intercepting ditch 2;

[0055] The rainwater runoff in the surface aquifer 14 of the bioretention facility 1 continues to vertically infiltrate through the planting soil layer 13, the cationic adsorption filler layer 12, and the drainage layer 11, and is stored in the facility. The overflow rainwater is collected through the overflow rainwater outlet 5 and discharged into the municipal rainwater pipe.

[0056] During the infiltration process of rainwater runoff in the bioretention facility 1, the cationic adsorption filler layer 12 filled with granular activated carbon absorbs a large amount of cations (such as Na, K, etc.) brought by the snowmelt agent, further reducing the salinity in the facility, especially in the planting soil layer 13, and ensuring the normal physiological activities of the organisms in the facility;

[0057] At the same time, salt-tolerant plants 15 with strong salt-alkali resistance and relatively good pollution purification effect are planted in the bioretention facility 1 to further enhance the overall resistance of the facility to the harm of snow-melting agents.

[0058] The anti-icing agent improved bioretention facility of the present invention sets a semi-isolated interception ditch 2 between the main body of the traditional bioretention facility and the hardened ground on both sides, and fills the runoff regulation and ion adsorption materials therein. In this way, the runoff containing the deicing agent that was originally discharged directly into the green space in the bioretention facility is first intercepted and regulated in the interception ditch 2, and after fully absorbing the suspended impurities and chloride ions brought by the deicing agent, it is discharged into the main body of the bioretention facility. In this way, the chloride ion concentration of the runoff entering the surface aquifer 14 and the planting soil layer 13 of the facility can be effectively reduced, and its biological toxicity can be weakened. At the same time, by setting a cationic adsorbent at the bottom of the planting soil layer 13, the cations in the salt of the deicing agent are effectively adsorbed and fixed, thereby reducing the alkalinity of the pore water of the facility matrix, creating conditions for the normal growth of organisms.

[0059] Based on the rainwater runoff regulation, storage and purification functions of traditional biological retention facilities, the present invention strengthens the facility's ability to handle high-salinity runoff. In scenarios where high-salt substances such as snow-melting agents are used in large quantities in winter, the present invention has strong application value.

[0060] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-icing agent improved bioretention facility, characterized in that: include: A bioretention facility, wherein the bioretention facility is provided with a drainage layer, a cation adsorption filling layer and a planting soil layer in order from bottom to top; At least one intercepting ditch is arranged on the side wall of the biological retention facility, and an anion adsorption layer and a water storage layer are arranged in the intercepting ditch from bottom to top, and the anion adsorption layer is connected to the top of the planting soil layer through a plurality of outlet pipes.

2. The anti-icing agent improved bioretention facility according to claim 1, characterized in that: The biological retention facility is located on the planting soil layer and a surface aquifer is provided, and the bottom of the outlet of the water outlet pipe is consistent with the normal water level of the surface aquifer; An overflow rainwater outlet is provided in the biological retention facility, and the top of the wellhead of the overflow rainwater outlet is consistent with the normal water level of the surface aquifer.

3. The anti-icing agent improved bioretention facility according to claim 1, characterized in that: A plurality of grille cover plates are installed on the top of the intercepting ditch, and the plurality of grille cover plates are arranged along the length direction of the intercepting ditch.

4. The anti-icing agent improved bioretention facility according to claim 2, characterized in that: The water storage layer includes a plurality of water storage modules, the anion adsorption layer includes a plurality of anion adsorption units, the plurality of water storage modules are arranged along the longitudinal direction of the intercepting ditch, and the plurality of anion adsorption units are arranged along the longitudinal direction of the intercepting ditch.

5. The anti-icing agent improved bioretention facility according to claim 4, characterized in that: Each of the anion adsorption units is connected to the surface water stagnant layer through the water outlet pipe.

6. The anti-icing agent improved bioretention facility according to claim 2, characterized in that: An impermeable membrane is arranged on the peripheral wall of the biological retention facility, and the drainage layer, the cation adsorption filling layer, the planting soil layer and the surface water retention layer are arranged in sequence from bottom to top in the impermeable membrane. The top of the impermeable membrane is consistent with the normal water level of the surface water retention layer, and a plain soil foundation is arranged at the bottom of the impermeable membrane.

7. The anti-icing agent improved bioretention facility according to claim 2, characterized in that: The intercepting ditch comprises a pool body, in which the anion adsorption layer and the water storage layer are arranged in sequence from bottom to top, one end of several outlet pipes are respectively connected to the anion adsorption layer, and the other ends of several outlet pipes respectively pass through the side wall of the pool body and are connected to the surface water stagnant layer.

8. The anti-icing agent improved bioretention facility according to claim 1, characterized in that: Permeable geotextiles are arranged on the peripheral wall of the anion adsorption layer, the peripheral wall of the water storage layer, between the drainage layer and the cation adsorption filling layer, and between the cation adsorption filling layer and the planting soil layer.

9. The anti-icing agent improved bioretention facility according to claim 1, characterized in that: The anion adsorption layer is made of strong base anion exchange resin particles, and the cation adsorption filling layer is made of granular activated carbon.

10. The anti-icing agent improved bioretention facility according to claim 1, characterized in that: The water storage layer is porous fiber cotton.

Images