Integrated device and method for in-situ mineralization of rainwater through bioretention facility

Abstract

The invention relates to an integrated device and method for in-situ mineralization of rainwater through a bioretention facility. The integrated device comprises a bioretention device body, and the bioretention device body is composed of a super high-rise building, a water storage layer, a covering layer, a filler layer and a drainage layer from top to bottom. The invention further provides a method for in-situ mineralization of rainwater through the integrated device, and the method comprises the steps that the rainwater flows into the super high-rise building through the road surface confluence and flows into the water storage layer from the super high-rise building, and the rainwater passing through the water storage layer infiltrates into the covering layer; the rainwater infiltrated through the covering layer enters the filler layer; rainwater mineralized by the filler layer infiltrates into the drainage layer, the water volume in the drainage layer is gradually increased and the water storage liquid level is gradually increased along with the convergence of the rainwater, and when the water storage liquid level of the drainage layer exceeds the height of the upper edge of the perforated drainage pipe, the rainwater flows into the perforated drainage pipe through the nylon net, so that in-situ mineralization and collection of the rainwater are realized. According to the invention, the problems of scattered layout, large occupied space, complex operation and the like of the existing sectional mineralization treatment technology are solved.

Description

Technical Field

[0001] The invention relates to the technical field of water collection and mineralization, and in particular to an integrated device and method for in-situ mineralization of rainwater in a bioretention facility. Background Art

[0002] In recent years, with the vigorous development of the national economy, the construction of border islands has been basically completed. With the gradual entry of a large number of personnel and equipment into the islands and reefs, the continuous increase in the intensity of personnel activities and the hot and humid climate conditions have led to a significant increase in the consumption of drinking water. Due to the general lack of fresh water resources on the islands and reefs, the problem of drinking water has become increasingly prominent. Although the islands and reefs have abundant rainfall and low pollution, rainwater can be an effective source of drinking water for island personnel after proper treatment. However, due to the low hardness of rainwater and the lack of necessary minerals, long-term drinking may be detrimental to health. Therefore, it is necessary to mineralize rainwater. Current mineralization technology usually requires the establishment of rainwater storage tanks to collect and store rainwater, and then mineralize it, which is a staged mineralization treatment method. This technology requires a dispersed layout, occupies a large space, and is complex to operate, which is difficult to meet the current needs of island construction. Therefore, we continue to seek an integrated device that can realize in-situ rainwater mineralization and collection. Summary of the invention

[0003] In view of this, the object of the present invention is to provide an integrated device and method for in-situ mineralization of rainwater in a bioretention facility, so as to solve the problems of existing segmented mineralization treatment technology such as scattered layout, large space occupation and complex operation.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] An integrated device for in-situ mineralization of rainwater in a bioretention facility, comprising a bioretention device body, wherein the bioretention device body is composed of a super-high layer, a water storage layer, a covering layer, a filling layer and a drainage layer from top to bottom, so as to simultaneously achieve precipitation, adsorption and mineral operation of rainwater;

[0006] The filler of the filler layer is selected from coral sand.

[0007] According to the above technical means, firstly, the layered design of the device enables it to effectively precipitate, adsorb and mineralize rainwater, thereby improving the efficiency and quality of rainwater treatment. The super-high layer can initially intercept larger suspended matter, and the aquifer can store a certain amount of rainwater to provide a time buffer for subsequent treatment. The covering layer helps prevent direct evaporation and pollution of rainwater, while providing an aesthetic appearance. The packing layer uses coral sand as a filler, which has good adsorption properties and can effectively remove pollutants such as organic matter and heavy metals in the water. Finally, the drainage layer ensures that the treated rainwater can be discharged smoothly while preventing soil erosion. Overall, this device not only improves the efficiency of rainwater treatment, but also has the characteristics of environmental protection and beauty.

[0008] Among them, coral sand is a biodeposits composed of debris formed after the weathering of coral reefs, mainly distributed in the tropical ocean area between 30° south latitude and 30° north latitude. Coral sand is mainly composed of aragonite and high-magnesium calcite, and its chemical composition is mainly calcium carbonate (CaCO3). It is also called calcareous sand, biological sand, coral debris or biodeposits. Coral sand has good engineering mechanical properties, its shape is angular, the surface is loose and porous, it has low dry density, high porosity and large compressibility, so it has the basic conditions to be used as filler and mineral dissolution material for bioretention facilities.

[0009] Preferably, the bioretention device body is of cylindrical configuration.

[0010] Preferably, the particle size of the coral sand in the filler layer decreases from top to bottom.

[0011] By cleverly designing the filling particle size of the entire coral sand filling layer to gradually reduce the particle size from top to bottom, the rainwater flowing from the upper coral sand filling layer into the lower coral sand filling matrix has a more sufficient contact time with the coral sand filling matrix. The calcium carbonate in the coral sand reacts chemically with the rainwater, and the reaction equation is CaCO3+CO2+H2O→Ca 2+ +2HCO 3- , the coral sand gradually dissolves in the rainwater, increasing the calcium ion content in the rainwater, thereby effectively improving the mineralization of the rainwater.

[0012] Preferably, the packing layer includes a first packing layer, a second packing layer, a third packing layer and a fourth packing layer from top to bottom;

[0013] The first filler layer is filled with coral sand with a particle size of 4 to 6 mm;

[0014] The second filler layer is filled with coral sand with a particle size of 2 to 3 mm;

[0015] The third filler layer is filled with coral sand with a particle size of 0.5 to 2 mm;

[0016] The fourth filler layer is filled with coral sand with a particle size less than 0.5 mm.

[0017] By designing the packing layer from top to bottom with coral sand of different particle sizes, a more effective filtration effect can be achieved. The coral sand with large particle size is located in the upper layer, which can first intercept larger suspended matter, while the coral sand with small particle size is located in the lower layer, which can further intercept smaller suspended matter, thereby improving the overall filtration efficiency. Coral sand layers with different particle sizes can filter particles of different sizes, making the filtration process more refined. The coral sand layer with small particle size can effectively intercept tiny particles and improve the cleanliness of water quality. The coral sand layers with different particle sizes increase the contact area between water and packing, thereby increasing the contact opportunity between pollutants and packing and enhancing the removal effect of pollutants. As the particle size of the packing layer gradually decreases, the distribution of water flow in the packing layer can be optimized, the short-circuiting phenomenon of water flow can be reduced, and the water flow can be ensured to pass through each layer of packing evenly, thereby improving the filtration effect. The layered design allows each layer of packing to filter pollutants of a specific size range, reducing the clogging and wear of the packing layer, thereby extending the service life of the entire filtration system.

[0018] Preferably, the bottoms of the first filler layer, the second filler layer, the third filler layer, the fourth filler layer and the cover layer are all provided with permeable geotextiles.

[0019] Permeable geotextiles can effectively guide water out through the filler layer, reducing the retention time of water in the filler layer, thereby improving the drainage performance of the overall structure. Permeable geotextiles have good filtering functions, which can prevent fine filler particles from being lost with water and maintain the stability and integrity of the filler layer. By reducing the erosion of water on the filler layer, permeable geotextiles help improve the stability of the entire structure and extend its service life. Since permeable geotextiles can effectively prevent filler loss and erosion, they can reduce subsequent maintenance and repair work, thereby reducing long-term maintenance costs.

[0020] Preferably, the filling height of the first packing layer is 100 mm.

[0021] Preferably, the filling height of the second packing layer is 100 mm.

[0022] Preferably, the filling height of the third packing layer is 200 mm.

[0023] Preferably, a perforated water-leakage mesh is installed at the bottom of the permeable geotextile.

[0024] Among them, the perforated water-leaking mesh can quickly guide water through and effectively prevent water from accumulating under the geotextile, thereby improving the efficiency of the overall drainage system. By quickly draining water, the perforated water-leaking mesh helps reduce soil erosion caused by water flow and maintains the stability of the soil structure. The perforated water-leaking mesh combined with the permeable geotextile can further enhance the filtration performance and prevent fine soil particles from being lost with the water flow. Since the water can be discharged quickly, the soaking time of the geotextile is reduced, thereby extending the service life of the geotextile. The perforated water-leaking mesh can be selected with different apertures and materials according to different engineering requirements. It has good adaptability and is suitable for a variety of environments and conditions.

[0025] Wherein, the bottom of the permeable geotextile is in close contact with the top of the perforated water-leakage mesh plate.

[0026] Preferably, the filling layer includes, from top to bottom, a first filling layer, a layer of permeable geotextile, a layer of perforated water-leakage mesh, a second filling layer, a layer of permeable geotextile, a layer of perforated water-leakage mesh, a third filling layer, a layer of permeable geotextile, a layer of perforated water-leakage mesh, a fourth filling layer, a layer of permeable geotextile and a layer of perforated water-leakage mesh.

[0027] Preferably, an overflow port is provided at a position close to the top of the super high-rise, and a water outlet pipe is embedded at the overflow port.

[0028] Preferably, the covering material in the covering layer is selected from tree bark.

[0029] Preferably, the length of the bark is 1 to 3 cm.

[0030] Preferably, the thickness of the covering layer is 5 cm.

[0031] Preferably, the filler in the drainage layer is selected from gravel.

[0032] Preferably, a perforated drainage pipe is installed inside the drainage layer.

[0033] Preferably, the drainage layer is filled with gravel with a particle size of 6 to 9 mm.

[0034] Preferably, the perforated drainage pipe is wrapped with a nylon mesh.

[0035] Among them, nylon mesh can provide additional support to prevent the perforated drain pipe from deformation or damage during transportation and installation. Nylon mesh can block larger particles of impurities from entering the drain pipe, thereby reducing the risk of blockage and ensuring smooth drainage. By protecting the perforated drain pipe from erosion and physical damage from the external environment, nylon mesh helps to extend the service life of the drain pipe. The filtering effect of nylon mesh can ensure that only water and small particles pass through, thereby improving drainage efficiency and effectiveness. The wrapping of nylon mesh makes the perforated drain pipe more convenient during installation and maintenance, while reducing direct contact with the drain pipe and reducing maintenance costs.

[0036] Preferably, the pore size of the nylon mesh is 0.35 mm.

[0037] Preferably, a water outlet valve is installed on the perforated drain pipe.

[0038] Preferably, the perforated drainage pipe is located 20 mm from the bottom of the drainage layer.

[0039] The present invention also provides a method for using the integrated device to mineralize rainwater in situ, comprising the following steps:

[0040] S1. Rainwater flows into the super-high-rise through the road surface, and then flows into the aquifer from the super-high-rise. The rainwater infiltrates through the aquifer to the cover layer, and the cover layer initially precipitates rainwater runoff pollutants and stores rainwater.

[0041] S2. After the rainwater infiltrates through the cover layer, it enters the filler layer. The rainwater infiltrates to reduce rainwater runoff, adsorb and intercept pollutants in the initial rainwater, and mineralize the rainwater.

[0042] S3. After being mineralized by the filler layer, rainwater infiltrates into the drainage layer. With the influx of rainwater, the amount of water stored in the drainage layer gradually increases, and the water level gradually rises. When the water level in the drainage layer exceeds the upper edge height of the perforated drainage pipe, the rainwater will flow into the perforated drainage pipe through the nylon mesh, realizing the in-situ mineralization and collection of rainwater.

[0043] Beneficial effects of the present invention:

[0044] The integrated device for in-situ mineralization of rainwater in a biological retention facility of the present invention skillfully combines rainwater mineralization treatment and rainwater collection technology into one, constructs an integrated device for in-situ rainwater mineralization and collection in a biological retention facility using coral sand as filler, reduces the area occupied and the installation area of ​​the treatment process, and the runoff rainwater that initially enters the biological retention facility is adsorbed, precipitated, and filtered by the vegetation in the covering layer to remove pollutants in the rainwater runoff, and then the rainwater is assisted by the bark to infiltrate downward, and then passes through the filler layer filled with coral sand, thereby effectively reducing the rainwater runoff on the road surface, and at the same time effectively adsorbing, intercepting, and mineralizing the rainwater in the initial stage, which not only avoids the occurrence of road surface waterlogging, but also effectively solves the problems of the existing segmented mineralization treatment technology having a dispersed layout, a large space occupation, and complex operation, and has promotion and application value in the field of water collection and mineralization technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic structural diagram of an integrated device for in-situ mineralization of rainwater in a bioretention facility of the present invention;

[0046] Among them, 1-super high layer; 2-aquifer; 3-covering layer; 4-filling layer, 41-first filler layer, 42-second filler layer, 43-third filler layer, 44-fourth filler layer; 5-drainage layer; 6-permeable geotextile; 7-perforated leaky mesh; 8-overflow; 9-outlet pipe; 10-perforated drainage pipe; 11-nylon mesh; 12-valve. DETAILED DESCRIPTION

[0047] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0048] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0049] The present invention intends to disclose an integrated device and method for in-situ mineralization of rainwater in a bioretention facility, so as to solve the problems of existing segmented mineralization treatment technology, such as dispersed layout, large space occupation and complex operation.

[0050] Among them, Figure 1 As shown, an integrated device for in-situ mineralization of rainwater in a bioretention facility is characterized in that it includes a bioretention device body, which is composed of a super-high layer 1, a water storage layer 2, a cover layer 3, a filler layer 4 and a drainage layer 5 from top to bottom, so as to simultaneously achieve precipitation, adsorption and mineralization operations of rainwater;

[0051] The filler of the filler layer 4 is selected from coral sand.

[0052] Illustratively, the bioretention device body is cylindrical in configuration.

[0053] In some embodiments, the particle size of the coral sand in the filler layer 4 decreases from top to bottom.

[0054] Exemplarily, in order to gradually increase the contact time between rainwater and coral sand when passing through the packing layer, thereby further adsorbing and precipitating pollutants in the rainwater, and gradually increasing the calcium ion content in the rainwater, thereby improving the mineralization of the rainwater, the packing layer 4 is set to include a first packing layer 41, a second packing layer 42, a third packing layer 43 and a fourth packing layer 44 from top to bottom;

[0055] The first filler layer 41 is filled with coral sand with a particle size of 4 to 6 mm;

[0056] The second filler layer 42 is filled with coral sand with a particle size of 2 to 3 mm;

[0057] The third filler layer 43 is filled with coral sand with a particle size of 0.5 to 2 mm;

[0058] The fourth filler layer 44 is filled with coral sand having a particle size less than 0.5 mm.

[0059] In some embodiments, the first filler layer 41 , the second filler layer 42 , the third filler layer 43 , the fourth filler layer 44 and the bottom of the cover layer 3 are all equipped with a permeable geotextile 6 .

[0060] Exemplarily, the filling height of the first filler layer 41 is 100 mm.

[0061] Exemplarily, the filling height of the second filler layer 42 is 100 mm.

[0062] Exemplarily, the filling height of the third filler layer 43 is 200 mm.

[0063] Exemplarily, the filling height of the fourth filler layer 44 is 400 mm.

[0064] In some embodiments, a perforated water-permeable mesh plate 7 is installed at the bottom of the permeable geotextile 6 .

[0065] The bottom of the permeable geotextile 6 is in close contact with the top of the perforated water-leakage mesh plate 7 .

[0066] Exemplarily, the filling layer 4 includes, from top to bottom, a first filling layer 41, a layer of permeable geotextile 6, a layer of perforated water-leakage mesh 7, a second filling layer 42, a layer of permeable geotextile 6, a layer of perforated water-leakage mesh 7, a third filling layer 43, a layer of permeable geotextile 6, a layer of perforated water-leakage mesh 7, a fourth filling layer 44, a layer of permeable geotextile 6 and a layer of perforated water-leakage mesh 7.

[0067] Exemplarily, an overflow port 8 is provided near the top of the super high-rise 1 , and a water outlet pipe 9 is embedded in the overflow port 8 .

[0068] Exemplarily, the covering material in the covering layer 3 is selected from bark;

[0069] Exemplarily, the length of the bark is 1 to 3 cm.

[0070] Exemplarily, the thickness of the covering layer 3 is 5 cm.

[0071] Exemplarily, the filler in the drainage layer 5 is selected from gravel.

[0072] Exemplarily, a perforated drainage pipe 10 is installed inside the drainage layer 5 .

[0073] In some embodiments, the drainage layer 5 is filled with gravel having a particle size of 6 to 9 mm.

[0074] In some embodiments, the perforated drain pipe 10 is wrapped with a nylon mesh 11 .

[0075] Exemplarily, the pore size of the nylon mesh 11 is 0.35 mm.

[0076] Exemplarily, a water outlet valve 12 is installed on the perforated drain pipe 10;

[0077] Exemplarily, the perforated drainage pipe 10 is located 20 mm away from the bottom of the drainage layer 5 .

[0078] In some embodiments, a method for using the above integrated device for in-situ mineralization of rainwater is also provided, comprising the following steps:

[0079] S1, rainwater flows into super-high-rise 1 through road confluence, and flows into aquifer 2 from super-high-rise 1. Rainwater from aquifer 2 infiltrates into cover layer 3, and cover layer 3 initially precipitates rainwater runoff pollutants and stores rainwater;

[0080] S2, rainwater that has infiltrated through the cover layer 3 enters the filler layer 4, where the rainwater infiltrates to reduce rainwater runoff, adsorb and intercept pollutants in the initial rainwater, and mineralize the rainwater;

[0081] S3. The rainwater after mineralization by the filler layer 4 infiltrates into the drainage layer 5. With the influx of rainwater, the amount of water stored in the drainage layer 5 gradually increases, and the water level gradually rises. When the water level of the drainage layer 5 exceeds the upper edge height of the perforated drainage pipe 10, the rainwater will flow into the perforated drainage pipe 10 through the nylon mesh 11, thereby realizing the in-situ mineralization and collection of rainwater.

[0082] The above-mentioned integrated device for in-situ mineralization of rainwater in a bioretention facility comprises the following steps when actually performing in-situ mineralization of rainwater:

[0083] S1. In the cavity of the bioretention device body from bottom to top, gravel particles with a particle size of 6-9 mm are evenly laid in a drainage layer 5 with a height of 10 cm, a layer of perforated water-leakage mesh plate 7 with an inner diameter of 2 mm is laid on the gravel, a layer of permeable geotextile 6 is laid on the perforated water-leakage mesh plate 7, coral sand with a height of 40 cm and a particle size of ≤0.5 mm is laid on the permeable geotextile 6 as a fourth filler layer 44, a layer of perforated water-leakage mesh plate 7 with a mesh inner diameter of 2 mm is laid on the top of the fourth filler layer 44, a layer of perforated geotextile 6 is laid on the perforated water-leakage mesh plate 7, coral sand with a height of 20 cm and a particle size of 0.5-2 mm is laid on the permeable geotextile 6 as a third filler layer 43, and coral sand with a mesh inner diameter of 2 mm is laid on the top of the third filler layer 43. A layer of perforated water-leaking mesh plate 7 with an inner diameter of 2 mm is laid, a layer of permeable geotextile 6 is laid on the perforated water-leaking mesh plate 7, coral sand with a height of 10 cm and a particle size of 2-4 mm is laid on the permeable geotextile 6 as a second filler layer 42, a layer of perforated water-leaking mesh plate 7 with an inner diameter of mesh holes of 2 mm is laid on the top of the second filler layer 42, a layer of perforated water-leaking mesh plate 7 with an inner diameter of mesh holes of 2 mm is laid on the perforated water-leaking mesh plate 7, coral sand with a height of 10 cm and a particle size of 4-6 mm is laid on the permeable geotextile 6 as a first filler layer 41, a layer of permeable geotextile 6 is laid on the top of the first filler layer 41, tree bark with a height of 5 cm and a length of 1-3 cm is laid on the permeable geotextile 6 as a covering layer 3, an aquifer 2 is laid on the covering layer 3, and a super-high layer 1 is laid on the aquifer 2;

[0084] S2, open the water outlet valve 12;

[0085] S3, rainwater flows through the road surface, flows into the super-high layer 1 of the bioretention facility along the inner wall of the top opening of the bioretention facility, and flows from the super-high layer 1 into the aquifer 2. The rainwater from the aquifer 2 slowly infiltrates to the cover layer 3, and the cover layer 3 initially precipitates rainwater runoff pollutants and stores rainwater;

[0086] S4, after infiltrating through the cover layer 3, the rainwater infiltrates to the permeable geotextile 6 below and enters the first packing layer 41. The coral sand in the first packing layer 41 has a particle size of 4 to 6 mm and a hydraulic retention time of 1 to 2 minutes. The porosity of the coral sand in the first packing layer 41 is large, so that the rainwater can infiltrate quickly and reduce rainwater runoff;

[0087] S5. Rainwater passing through the first packing layer 41 quickly infiltrates to the permeable geotextile 6 below. The permeable geotextile 6 collects and infiltrates the runoff rainwater. The infiltrated rainwater flows into the second packing layer 42 through the perforated water-leakage mesh plate 7. The second packing layer 42 is filled with coral sand with a particle size of 2 to 4 mm and a hydraulic retention time of 2 to 3 minutes, so that the fine coral sand particles can adsorb and retain pollutants in the initial rainwater and have a certain mineralization effect.

[0088] S6, the rainwater passing through the second filler layer 42 infiltrates to the permeable geotextile 6 below, and the permeable geotextile 6 collects the runoff rainwater and then infiltrates to the third filler layer 43 through the perforated water-leaking mesh plate 7 below. The coral sand filled in the third filler layer 43 has a particle size of 0.5-2 mm and a hydraulic retention time of 3-5 min, so that the coral sand and H in the rainwater are + The reaction generates Ca 2+ Mg 2+ ions, increasing the mineralization of rainwater;

[0089] S7, rainwater passing through the third filler layer 43 infiltrates to the permeable geotextile 6 below, and the permeable geotextile 6 collects the runoff rainwater and then infiltrates to the fourth filler layer 44 through the perforated water-leaking mesh plate 7 below. The fourth filler layer 44 is filled with coral sand with a particle size of ≤0.5 mm, and the hydraulic retention time is 5 to 8 minutes. The rainwater is retained in the fourth filler layer 44 for a long time, so that the powdered coral sand reacts fully with the retained rainwater, and the CaCO3 in the coral sand is converted into CaCO3. 2+ Dissolved in water, it increases the calcium ions and hardness in rainwater, and improves the mineralization of rainwater.

[0090] S8, the rainwater after mineralization through the fourth filler layer 44 slowly infiltrates to the permeable geotextile 6 below, the permeable geotextile 6 collects and infiltrates the runoff rainwater, and the infiltrated rainwater slowly infiltrates to the drainage layer 5 filled with gravel through the perforated water-leakage mesh plate 7 below;

[0091] S9. As rainwater flows in, the amount of water stored in the drainage layer 5 gradually increases, and the water level gradually rises. When the water level of the drainage layer 5 exceeds the height of the upper edge of the perforated drainage pipe 10, the rainwater will enter the perforated drainage pipe 10 through the mesh of the nylon mesh 11, and the bioretention facility will begin to collect rainwater. The rainwater mineralized by the bioretention facility with coral sand as filler flows out through the valve 12 and enters the next unit. The test results of calcium, magnesium and hardness of the water quality of the device are shown in Table 1.

[0092] As can be seen from Table 1, the calcium, magnesium and hardness of the water quality of the device all meet the "Sanitary Standards for Mineralization of Low-Mineralized Drinking Water"

[0093] (GJB1335-92), and the trace elements metasilicic acid and strontium meet the "National Food Safety Standard for Drinking Natural Mineral Water" (GB8537-2018).

[0094] Table 1 Water quality of mineralized effluent from coupled process

[0095]

[0096] In summary, the integrated device for in-situ mineralization of rainwater in the bioretention facility of the present invention cleverly integrates rainwater mineralization treatment with rainwater collection technology. The device constructs a bioretention facility with coral sand as filler, realizing the integration of in-situ rainwater mineralization and collection. In this way, not only the floor space and installation area required for the treatment process are reduced, but also pollutants in the runoff rainwater are effectively removed through adsorption, precipitation and filtration by vegetation in the covering layer. Subsequently, the rainwater further penetrates downward with the help of the bark layer, and through the filler layer filled with coral sand, the road surface rainwater runoff is effectively reduced, and the pollutants in the initial rainwater are adsorbed and intercepted, and the mineralization of rainwater is realized at the same time. This innovation not only avoids the problem of road surface water accumulation, but also effectively solves the problems of the existing segmented mineralization treatment technology, such as scattered layout, large floor space and complex operation. Therefore, in the field of water collection and mineralization technology, the device has significant promotion and application value.

[0097] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. An integrated device for in-situ mineralization of rainwater in a bioretention facility, characterized in that: The bioretention device comprises a body, which is composed of a super-high layer (1), an aquifer (2), a cover layer (3), a filler layer (4) and a drainage layer (5) from top to bottom; The filler of the filler layer (4) is selected from coral sand.

2. The integrated device for in-situ mineralization of rainwater in a bioretention facility according to claim 1, characterized in that: The particle size of the coral sand in the filler layer (4) decreases from top to bottom.

3. The integrated device for in-situ mineralization of rainwater in a bioretention facility according to claim 2, characterized in that: The packing layer (4) comprises, from top to bottom, a first packing layer (41), a second packing layer (42), a third packing layer (43) and a fourth packing layer (44); The first filler layer (41) is filled with coral sand having a particle size of 4 to 6 mm; The second filler layer (42) is filled with coral sand having a particle size of 2 to 3 mm; The third filler layer (43) is filled with coral sand having a particle size of 0.5-2 mm; The fourth filler layer (44) is filled with coral sand with a particle size less than 0.5 mm.

4. The integrated device for in-situ mineralization of rainwater in a bioretention facility according to claim 3, characterized in that: The bottoms of the first filler layer (41), the second filler layer (42), the third filler layer (43), the fourth filler layer (44) and the cover layer (3) are all provided with a permeable geotextile (6); and / or, the filling height of the first filler layer (41) is 100 mm; and / or, the filling height of the second filler layer (42) is 100 mm; and / or, the filling height of the third filler layer (43) is 200 mm; And / or, the filling height of the fourth filler layer (44) is 400 mm.

5. The integrated device for in-situ mineralization of rainwater in a bioretention facility according to claim 4, characterized in that: A perforated water-leakage mesh plate (7) is installed at the bottom of the permeable geotextile (6).

6. The integrated device for in-situ mineralization of rainwater in a bioretention facility according to claim 1, characterized in that: An overflow port (8) is provided at a position close to the top of the super high-rise (1), and a water outlet pipe (9) is embedded at the overflow port (8).

7. The integrated device for in-situ mineralization of rainwater in a bioretention facility according to claim 1, characterized in that: The covering material in the covering layer (3) is selected from tree bark; And / or, the thickness of the covering layer (3) is 5 cm.

8. The integrated device for in-situ mineralization of rainwater in a bioretention facility according to claim 1, characterized in that: The filler in the drainage layer (5) is selected from gravel; And / or, a perforated drainage pipe (10) is installed inside the drainage layer (5).

9. The integrated device for in-situ mineralization of rainwater in a bioretention facility according to claim 8, characterized in that: The drainage layer (5) is filled with gravel with a particle size of 6 to 9 mm; And / or, the perforated drainage pipe (10) is wrapped with a nylon mesh (11); and / or, a valve (12) is installed on the perforated drain pipe (10); And / or, the perforated drainage pipe (10) is located 20 mm away from the bottom of the drainage layer (5).

10. A method for in-situ mineralization of rainwater using the integrated device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, rainwater flows into the super-high-rise (1) through the road surface confluence, and flows from the super-high-rise (1) into the aquifer (2), and the rainwater infiltrates through the aquifer (2) to the cover layer (3), and the cover layer (3) initially precipitates rainwater runoff pollutants and stores rainwater; S2, rainwater that has infiltrated through the cover layer (3) enters the filler layer (4), where the rainwater infiltrates to reduce rainwater runoff, adsorb and intercept pollutants in the initial rainwater, and mineralize the rainwater; S3. After being mineralized by the filler layer (4), rainwater infiltrates into the drainage layer (5). As the rainwater flows in, the amount of water stored in the drainage layer (5) gradually increases, and the water level gradually rises. When the water level in the drainage layer (5) exceeds the height of the upper edge of the perforated drainage pipe (10), the rainwater will flow into the perforated drainage pipe (10) through the nylon mesh (11), thereby realizing the in-situ mineralization and collection of rainwater.

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