Sponge city bioretention PP water storage combination system

Abstract

The utility model discloses a sponge city bioretention PP water storage combination system which comprises a bioretention device used for treating initial rainwater runoff and a rainwater collecting device connected with the bioretention device and used for collecting treated rainwater. The bioretention device comprises a water storage layer, a vegetation layer, a planting soil layer, an artificial filler layer, a PP water storage module layer and a perforated drainage pipe layer which are sequentially arranged from top to bottom, the planting soil layer, the artificial filler layer and the PP water storage module layer are separated through permeable geotextile, an opening is formed in the top of the bioretention device, and a drainage pipe is arranged in the perforated drainage pipe layer. One end of the drainage pipe extends into the PP water storage module layer; the rainwater collecting device comprises a reservoir, a rainwater collecting pipe and a drainage pipe, the rainwater collecting pipe is communicated with the reservoir, the other end of the drainage pipe is communicated with the rainwater collecting pipe, the drainage pipe is communicated with the reservoir, the pretreated rainwater is collected and reused, water resources are saved, and underground water is effectively compensated.

Description

Technical Field

[0001] The utility model relates to the technical field of municipal facilities such as urban water discharge, and specifically to a sponge city bioretention PP water storage combination system. Background Art

[0002] A sponge city refers to a city that can adapt to environmental changes and respond to natural disasters like a sponge, with good "elasticity". It can "infiltrate, store and purify water" during rains, and "release" and utilize the stored water when needed.

[0003] With the acceleration of urbanization, more and more cities have ignored their environmental carrying capacity during development. The ecological balance that has lasted for many years has been broken unknowingly, resulting in a more complex ecological water shortage.

[0004] During the construction of sponge cities, traditional bioretention facilities cannot effectively remove pollutants such as total phosphorus and ammonia nitrogen in the initial rainwater runoff, and the treated rainwater cannot be collected, resulting in a waste of water resources; although water storage modules have the advantages of large water storage capacity and convenient construction, they are limited in actual applications by the need for additional treatment facilities for the collected rainwater. Utility Model Content

[0005] The purpose of the utility model is to provide a sponge city bioretention PP water storage combination system to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the utility model provides the following technical solutions: a sponge city bioretention PP water storage combined system, the system comprising a bioretention device for treating initial rainwater runoff and a rainwater collection device connected to the bioretention device for collecting treated rainwater;

[0007] The bioretention device comprises an aquifer, a vegetation layer, a planting soil layer, an artificial filler layer, a PP water storage module layer and a perforated drainage pipe layer, which are arranged in sequence from top to bottom. The planting soil layer, the artificial filler layer and the PP water storage module layer are separated by a permeable geotextile. An opening is arranged at the top of the bioretention device. A drainage pipe is arranged in the perforated drainage pipe layer, and one end of the drainage pipe extends into the PP water storage module layer.

[0008] The rainwater collection device comprises a water reservoir, a rainwater collection pipe and a discharge pipe. The rainwater collection pipe is connected to the water reservoir, the other end of the discharge pipe is connected to the rainwater collection pipe, and the discharge pipe is connected to the water reservoir.

[0009] Furthermore, the height of the aquifer is 80 mm.

[0010] Furthermore, the height of the vegetation layer and the planting soil layer is 200 to 300 mm.

[0011] Furthermore, the permeable geotextile includes plastic fibers with a height of 1 mm.

[0012] Furthermore, the artificial filler layer includes an aluminum-based phosphorus-locking agent matrix filter material with a particle size of 1 to 3 mm and a height of 40 to 150 mm.

[0013] Furthermore, the height of the PP water storage module layer is 150 mm.

[0014] Furthermore, water-guiding and slow-flow cotton strips are arranged around the PP water storage module.

[0015] Furthermore, a water inlet connected to the rainwater collection pipe is provided at the lower portion of the water reservoir.

[0016] Furthermore, an overflow port is provided in the upper middle portion of the water reservoir, and the horizontal position of the overflow port is located between the water inlet and the drain pipe and is not higher than the horizontal position of the drain pipe.

[0017] Furthermore, the overflow port is connected to an overflow pipe.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. The utility model aims at the problems of direct discharge from traditional rainwater wells and rainwater pipe networks and insufficient compensation for groundwater. The bioretention device is used as a pretreatment device for rainwater and surface runoff. By adding an artificial filler layer to remove pollutants such as ammonia nitrogen and total phosphorus in the initial rainwater runoff, the problem of excessive nitrogen and phosphorus in the initial rainwater runoff is solved. By using a PP aquifer to replace the traditional gravel drainage layer, the treated rainwater is collected and stored, the overall runoff control effect is good, the construction cost and maintenance cost are low, and the cost is reduced. After pretreatment, the rainwater is collected and reused, saving water resources, greatly alleviating the water shortage problem in my country, effectively solving the problem of slow rainwater infiltration caused by urban construction, and effectively compensating for groundwater. In addition, the bioretention device can increase the urban greening coverage rate, and can also be used for drainage and waterlogging prevention, and the operation and management are simple;

[0020] 2. The water storage layer of the utility model can increase the evaporation of water in the city and reduce the occurrence of secondary dust; the vegetation layer and the planting soil layer can provide a place for microbial reproduction. When rainwater passes through the vegetation layer and the planting soil layer, the microorganisms in the plant roots and soil will purify the pollutants in the rainwater, and combined with the soil filtration effect, the rainwater pretreatment function is completed to improve the rainwater quality. Among them, the planting soil layer is generated by the resource utilization of garden waste. The planting soil is naturally composted through the garden debris and fallen leaves, which can not only provide sufficient nutrients for plants, but also recycle resources. Utilization; The artificial filler layer can prevent the loss of the vegetation layer and the soil layer and can filter pollutants. Among them, the artificial filler layer uses an artificially prepared aluminum-based phosphorus lock agent as a matrix filter material, which can effectively avoid the problem of excessive concentration of ammonia nitrogen and total phosphorus in the initial rainwater and reduce the occurrence of eutrophication of water bodies; the permeable geotextile uses plastic fibers, which can maintain full elongation in dry and wet states, have good water permeability, have gaps between fibers, have good water permeability, and can keep the corresponding parts of the material from leaking; the PP water storage module layer can store and discharge the water filtered out by the artificial filler layer;

[0021] 3. The treated rainwater of the utility model enters from the bottom of the reservoir through the rainwater collection pipe, which can impact and stir the impurities settled at the bottom of the pool, so that the impurities float up and are discharged from the overflow port, thereby keeping the water in the reservoir clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the sponge city bioretention PP water storage combination system of the utility model;

[0023] Figure 2 This is a schematic diagram of the top view of the structure of the sponge city bioretention PP water storage combination system of the utility model;

[0024] Figure 3 This is a schematic diagram of the main structure of the sponge city bioretention PP water storage combination system of the utility model;

[0025] Figure 4 This is a side view structural diagram of the sponge city bioretention PP water storage combined system of the utility model;

[0026] Figure 5 This is the ammonia nitrogen removal effect diagram of the sponge city bioretention PP water storage combined system of the utility model;

[0027] Figure 6 This is the total phosphorus removal effect diagram of the sponge city bioretention PP water storage combination system of the utility model;

[0028] In the figure, the figure includes: 1. water storage area; 2. plant planting area; 3. planting soil layer; 4. geotextile; 5. module overflow pipe; 6. matrix filter material layer; 7. PP water storage module; 8. water-conducting cotton strips; 9. perforated drainage pipe layer. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] like Figures 1 to 4 As shown, this embodiment provides a sponge city bioretention PP water storage combined system, the system includes a bioretention device 1 and a rainwater collection device 2 connected to the bioretention device 1 for collecting treated rainwater, and the bioretention device 1 can be provided with only one group or multiple groups in parallel for common use;

[0031] The biological retention device 1 is used to treat runoff rainwater, intercept pollutants in initial rainwater runoff, and absorb and purify pollutants in the water body such as (COD, ammonia nitrogen, TP, SS) by using microorganisms, plant roots, and matrix filter materials in the soil. The biological retention device 1 includes an aquifer 11, a vegetation layer 12, a planting soil layer 13, an artificial filler layer 14, a PP water storage module layer 15, and a perforated drainage pipe layer 16 arranged in sequence from top to bottom. The planting soil layer 13, the artificial filler layer 14, and the PP water storage module layer 15 are separated by a permeable geotextile 17. The biological retention device 1 can be configured as a retention tank with a cover plate, with an opening on the top, and rainwater enters from the opening. A drainage pipe is arranged in the perforated drainage pipe layer 16, and one end of the drainage pipe extends into the PP water storage module layer 15;

[0032] The height of the water storage layer 11 is 80 mm, and it is a structure for receiving, pre-treating, and storing incoming rainwater, forcing large particles to settle or adhere to this layer, which can increase the evaporation of water in the city and reduce the occurrence of secondary dust;

[0033] The medium and height of the vegetation layer 12 and the planting soil layer 13 are selected according to the effluent water quality requirements and the technical requirements for plant planting and garden maintenance management. The planting soil layer 13 of this system is produced by the resource utilization of garden waste. The planting soil is naturally composted by garden debris and fallen leaves, which can not only provide sufficient nutrients for plants, but also be recycled. The height is 200-300mm, which is mainly used to absorb and intercept most heavy metals and some organic pollutants in rainwater runoff, and can provide a place for microbial reproduction, ensure the moisture content of the root system and prevent soil erosion. When rainwater passes through the vegetation layer 2 and the planting soil layer 3, the plant roots and microorganisms in the soil will purify the pollutants in the rainwater, and combine with the soil filtration effect to complete the pretreatment function of rainwater, so that the water quality of rainwater is improved;

[0034] The artificial filler layer 14 uses an artificially prepared aluminum-based phosphorus lock agent as a matrix filter material, with a particle size of 1 to 3 mm and a height of 40 to 150 mm. Its function is to prevent the loss of the vegetation layer and the planting soil layer, and can also filter pollutants such as ammonia nitrogen and total phosphorus in the initial rainwater, which can effectively avoid the problem of excessively high concentrations of ammonia nitrogen and total phosphorus in the initial rainwater, and reduce the generation of eutrophication of water bodies. The artificial filler layer 14 is buried with a first overflow pipe 141, and the upper end of the first overflow pipe 141 passes through the planting soil layer 13 and the vegetation layer 12 in sequence to form a first overflow port 142. When the amount of rainwater is large, the rainwater in the artificial filler layer 14 cannot be filtered in time, and excessive rainwater overflows from the first overflow port 142 back to the vegetation layer 12;

[0035] The height of the PP water storage module layer 15 is 150 mm, and a water-guiding slow-flow cotton strip 151 is arranged around it. The diameter of the water-guiding slow-flow cotton strip 151 is 50 mm, so that the PP water storage module layer 15 can store and discharge the water filtered by the artificial filler layer 14;

[0036] The permeable geotextile 17 uses plastic fibers with a height of 1 mm, which can maintain full elongation in both dry and wet states, has good water permeability, and has gaps between the fibers, so it has good water permeability;

[0037] The diameter of the drainage pipe 161 in the perforated drainage pipe layer 16 is 110 mm, and one end of the drainage pipe extends into the PP water storage module layer 15;

[0038] The rainwater collection device 2 includes a water reservoir 21, a rainwater collection pipe 22 and a discharge pipe 23, and is also provided with a drainage pump 24. The rainwater collection pipe 22 is connected to the water reservoir 21, and the other end of the discharge pipe is connected to the rainwater collection pipe 22. The discharge pipe 23 is connected to the water reservoir 21. In this embodiment, a water inlet 211 connected to the rainwater collection pipe 22 is provided at the lower part of the water reservoir 21, and a second overflow port 212 is provided at the upper middle part of the water reservoir 21. The second overflow port The horizontal position of 212 is located between the water inlet 211 and the drain pipe and is not higher than the horizontal position of the drain pipe. The second overflow port 212 is connected to a second overflow pipe 25. When the treated rainwater flows into the water storage tank 21 from the water inlet 211 through the rainwater collecting pipe 22, it impacts and stirs the impurities settled at the bottom of the tank, so that the impurities float up and are discharged from the second overflow port 212 through the second overflow pipe 25. When the rainwater in the water storage tank 21 needs to be used, it is pumped out by the drainage pump 24.

[0039] In order to verify the adsorption performance of the utility model on ammonia nitrogen and total phosphorus pollutants in water, due to limited space, the test device is set up with a water storage layer with a thickness of 80mm, a planting soil layer with a thickness of 200mm, a 40mm aluminum-based phosphorus lock agent artificial filler layer, and a 150mm PP water storage layer from top to bottom, and the layers are separated by permeable geotextiles. The water quality of the test water refers to the initial rainwater runoff pollutant concentration, and the ammonia nitrogen concentration is prepared to be 3-5mg / L and the total phosphorus concentration is 0.5-0.8mg / L. The test lasted 80 days, using 3 peristaltic pumps to inlet water at the same time, the water inlet flow rate was 100ml / min, 86.4L of water was inlet each time, and water was inlet once every other day, for a total of 40 times, and samples were taken after each inlet to detect the ammonia nitrogen and total phosphorus concentrations.

[0040] According to water quality tests, for ammonia nitrogen, such as Figure 5 As shown, when the influent ammonia nitrogen concentration was 3-5 mg / L, the effluent concentration of the experimental group was 0.6-0.7 mg / L in the later stage of the experiment, and the average removal rate was about 86.82%, and the surface water reached Class IV at the 12th effluent.

[0041] For total phosphorus, Figure 6 As shown, when the influent total phosphorus concentration was 0.5-0.8 mg / L, the effluent concentration of the experimental group was 0.2-0.3 mg / L in the later stage of the experiment, reaching Class IV surface water at the 12th effluent, and then the effluent TP concentration fluctuated around 0.3 mg / L.

[0042] The length × width × height of the PP aquifer in the test device is 600mm × 500mm × 150mm, so its theoretical water storage capacity is 45L. However, since the PP aquifer also occupies a part of the volume in the device, the actual water storage capacity of the PP aquifer in this experiment is 44L.

[0043] Since the water storage capacity of the bioretention / PP water storage system is Q = 44L, without considering the planting soil and the absorption of water by the aluminum-based phosphorus lock artificial filler during rainfall, the rainfall is reversed by the formula V = F × φ × h, and h = 16.30mm is calculated. According to the national standard GB / T 28592-2012, 1h rainfall within 7-14.9mm is heavy rain, and the bioretention / PP water storage system can store rainfall less than 16.3mm.

[0044] In summary, the bioretention / PP water storage combination system can effectively remove ammonia nitrogen and total phosphorus pollutants in rainwater, and can effectively store rainfall of heavy rain and below.

[0045] The utility model aims at the problems of direct discharge from traditional rainwater wells and rainwater pipe networks and insufficient compensation for groundwater, and uses a biological retention device as a pretreatment device for rainwater and surface runoff. By adding an artificial filler layer to remove pollutants such as ammonia nitrogen and total phosphorus in the initial rainwater runoff, the problem of excessive nitrogen and phosphorus in the initial rainwater runoff is solved. By adopting a PP aquifer to replace the traditional gravel drainage layer, the treated rainwater is collected and stored, the overall runoff control effect is good, the construction cost and maintenance cost are low, and the cost is reduced. The rainwater after pretreatment is collected and reused, water resources are saved, and the water shortage problem in my country is greatly alleviated. The problem of slow rainwater infiltration caused by urban construction is effectively solved, and groundwater is effectively compensated. In addition, the biological retention device can increase the green coverage rate of the city, and can also be used for drainage and waterlogging prevention, and the operation and management are simple; the aquifer can increase the evaporation of water in the city and reduce the occurrence of secondary dust; the vegetation layer and the planting soil layer can provide a place for microbial reproduction. When rainwater passes through the vegetation layer and the planting soil layer, the microorganisms in the plant roots and soil will The pollutants are purified and combined with the soil filtration function to complete the rainwater pretreatment function and improve the rainwater quality. Among them, the planting soil layer is produced by the resource utilization of garden waste. The planting soil is naturally composted by garden debris and fallen leaves, which can not only provide sufficient nutrients for plants, but also be reused as a resource; the artificial filler layer can prevent the loss of the vegetation layer and the planting soil layer and can filter pollutants. Among them, the artificial filler layer uses an artificially prepared aluminum-based phosphorus lock agent as the matrix filter material, which can effectively avoid the problem of excessively high concentrations of ammonia nitrogen and total phosphorus in the initial rainwater. Reduce the occurrence of eutrophication of water bodies; the permeable geotextile uses plastic fibers, which can maintain full elongation in dry and wet states, have good water permeability, have gaps between fibers, have good water permeability, and can keep the corresponding parts of the material from leaking; the PP water storage module layer can store and discharge water filtered out of the artificial filler layer; the treated rainwater enters from the bottom of the reservoir through the rainwater collection pipe, which can impact and stir the impurities settled at the bottom of the pool, so that the impurities float up and are discharged from the overflow port, which can better keep the water in the reservoir clean.

[0046] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sponge city bioretention PP water storage combined system, characterized by: The system includes a bioretention device for treating initial rainwater runoff and a rainwater collection device connected to the bioretention device for collecting treated rainwater; The bioretention device comprises an aquifer, a vegetation layer, a planting soil layer, an artificial filler layer, a PP water storage module layer and a perforated drainage pipe layer which are arranged in sequence from top to bottom. The planting soil layer, the artificial filler layer and the PP water storage module layer are separated by a permeable geotextile. An opening is arranged at the top of the bioretention device. A drainage pipe is arranged in the perforated drainage pipe layer, and one end of the drainage pipe extends into the PP water storage module layer. The rainwater collection device comprises a water reservoir, a rainwater collection pipe and a discharge pipe. The rainwater collection pipe is connected to the water reservoir, the other end of the discharge pipe is connected to the rainwater collection pipe, and the discharge pipe is connected to the water reservoir.

2. The sponge city bioretention PP water storage combined system according to claim 1 is characterized by: The height of the aquifer is 80 mm.

3. The sponge city bioretention PP water storage combined system according to claim 1 is characterized by: The height of the vegetation layer and the planting soil layer is 200 to 300 mm.

4. The sponge city bioretention PP water storage combined system according to claim 1 is characterized by: The permeable geotextile comprises plastic fibers and has a height of 1 mm.

5. The sponge city bioretention PP water storage combined system according to claim 1 is characterized by: The artificial filler layer comprises an aluminum-based phosphorus-locking agent matrix filter material, with a particle size of 1 to 3 mm and a height of 40 to 150 mm.

6. The sponge city bioretention PP water storage combined system according to claim 1, characterized in that: The height of the PP water storage module layer is 150 mm.

7. The sponge city bioretention PP water storage combined system according to claim 1 or 6, characterized in that: The PP water storage module is provided with water-guiding and slow-flow cotton strips around it.

8. The sponge city bioretention PP water storage combined system according to claim 1 is characterized by: A water inlet connected to the rainwater collection pipe is provided at the lower part of the water storage tank.

9. The sponge city bioretention PP water storage combined system according to claim 8, characterized in that: An overflow port is provided in the upper middle portion of the water storage tank, and the horizontal position of the overflow port is located between the water inlet and the drain pipe and is not higher than the horizontal position of the drain pipe.

10. The sponge city bioretention PP water storage combined system according to claim 9, characterized in that: The overflow port is connected with an overflow pipe.

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