A device for collecting, treating and recycling initial rainwater along roads

Abstract

The present invention belongs to the field of rainwater collection technology, and particularly relates to a device for collecting, treating, and reusing initial rainwater along roads. Its technical solution is as follows: a device for collecting, treating, and reusing initial rainwater along roads, comprising a pretreatment tank, a sedimentation tank, a treatment tank, and a clean water tank arranged in sequence; a liquid collection pipeline is connected between the pretreatment tank and the grass-planting ditch; a partition wall is provided between the pretreatment tank and the sedimentation tank; a water outlet is provided on the lower side of the partition wall; a plurality of inclined filter tubes are provided in the sedimentation tank; a water weir is provided between the sedimentation tank and the treatment tank; a plurality of photocatalytic rods and a plurality of UV lamps are provided in the treatment tank; a permeable wall is provided between the treatment tank and the clean water tank; the clean water tank is connected to a water storage tank via a pipeline; a dripping pipeline is provided on the grass-planting ditch; the dripping pipeline is connected to the water storage tank. The present invention provides a device for collecting, treating, and reusing initial rainwater along roads that can improve the treatment effect of rainwater.

Description

Technical Field

[0001] The invention belongs to the technical field of rainwater collection, and in particular relates to a device for collecting, treating and recycling initial rainwater along a road. Background Art

[0002] Primary rainwater refers to precipitation that forms surface runoff on the ground, with a thickness of approximately 10 to 15 mm. Due to the large amount of dissolved pollutants, primary rainwater contains high concentrations of heavy metals, nutrients, organic matter, and other pollutants. This causes serious water pollution, making the treatment of primary rainwater crucial for maintaining the aquatic environment and its ecological environment. During rainfall, urban surface runoff and rainfall show a trend of gradual increase and then decrease.

[0003] During the initial rainfall period, rainwater washes over urban buildings, roads, and vegetation, carrying with it a significant amount of pollutants and causing runoff pollution. However, in the middle and later stages of a rainfall event, the pollutants in runoff decrease significantly, and the rainwater becomes relatively clean. Therefore, to address urban rainwater pollution, completely collecting and treating it before discharging it into the water is unrealistic and unnecessary. It is necessary to develop appropriate rainwater collection, treatment, and discharge strategies based on the characteristics of urban rainwater runoff and pollution to effectively control initial urban rainwater pollution and protect the urban water environment.

[0004] Developed countries have long been widely implementing comprehensive rainwater utilization. Based on years of practical experience, Germany established standards for rooftop rainwater utilization facilities in 1989. Currently, urban rainwater utilization in Germany has entered a stage of standardization and industrialization. Despite severe drought and water shortages, Israel has achieved a rainwater utilization rate of 98%.

[0005] At present, my country's urban drainage system adopts a diversion system, that is, the rainwater discharge system and the sewage discharge system are separated. For urban point sources that cause water pollution (such as domestic sewage), the strategy of collecting sewage pipes, treating domestic sewage treatment plants and then discharging it into the water body has achieved remarkable results. However, for urban primary rainwater that causes a certain degree of water pollution, it is still collected through the rainwater drainage system and discharged directly into the water body, lacking interception and purification measures. This has a huge impact on the safety of my country's urban water environment and the realization of water body management goals. Therefore, how to effectively intercept and purify urban primary rainwater has become a key way to ensure the safety of urban water environment and a good water ecological environment.

[0006] A common treatment method for primary rainwater is to divert polluted primary rainwater to the city's sewage pipes through a diversion device, and then transport it to the sewage treatment plant, while the secondary rainwater is discharged directly into the water body. However, this method puts a load impact on the sewage treatment plant and increases its operating costs. Another method is to use LID measures such as green roofs and grass-planted ditches to filter rainwater. However, this method can only effectively remove particulate impurities and some water-soluble pollutants in the primary rainwater, and cannot achieve good results for substances such as COD, SS, and NH3-N. Therefore, there is an urgent need to develop a primary rainwater purification system with high-efficiency treatment capabilities.

[0007] In summary, the current conventional primary rainwater collection and treatment technology has the following problems: insufficient processing capacity for collected primary rainwater and low quality of recycled rainwater; conventional physical filtration methods are all one-time construction, and the primary rainwater treatment process cannot be adjusted in real time according to changes in rainfall.

[0008] The present invention aims to solve the defects of the prior art and provide an initial rainwater collection, treatment and reuse device along the road, which has strong initial rainwater purification capacity, low cost and convenient use. Summary of the Invention

[0009] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide an initial rainwater collection, treatment and reuse device that can improve the rainwater treatment effect along the road.

[0010] The technical solution adopted in the present invention is:

[0011] A device for collecting, treating and reusing initial rainwater along a road comprises a pretreatment tank, a sedimentation tank, a treatment tank and a clean water tank which are arranged in sequence; a liquid collecting pipeline is connected between the pretreatment tank and the grass-planting ditch; a partition wall is provided between the pretreatment tank and the sedimentation tank; a water outlet is provided on the lower side of the partition wall; a plurality of filtering inclined tubes are provided in the sedimentation tank; a water weir is provided between the sedimentation tank and the treatment tank; a plurality of photocatalytic rods and a plurality of UV lamps are provided in the treatment tank; a permeable wall is provided between the treatment tank and the clean water tank; the clean water tank is connected to a water storage tank via a pipeline; a dripping pipeline is provided on the grass-planting ditch; the dripping pipeline is connected to the water storage tank.

[0012] The pretreatment tank of the present invention processes rainwater drawn from the grass-planting ditch. The treated rainwater then flows through the water inlet into the sedimentation tank, where the inclined filter tubes thoroughly filter the rainwater. The filtered rainwater then flows through the weir into the treatment tank, where photocatalytic rods and UV lamps treat the rainwater, improving the removal of difficult-to-degrade organic matter in the initial rainwater. The treated clean water then flows through a permeable wall into a water storage tank, where the water can be used to irrigate vegetation, allowing the treated rainwater to be reused.

[0013] As a preferred embodiment of the present invention, the pretreatment tank is equipped with a microwave generator and an aeration system. The aeration system uses microporous aeration to mix and agitate the water, increasing DO and improving the subsequent advanced oxidation treatment process. The microwave generator is used to break down emulsion droplets and other large aggregates in the influent water and degrade some organic pollutants.

[0014] As a preferred embodiment of the present invention, the liquid collection pipeline is equipped with a water quality detection module and a solenoid valve. The water quality detection module is electrically connected to a control device, which is in turn electrically connected to the solenoid valve. The water quality detection module includes a conductivity monitoring device for measuring the conductivity of the incoming water. When the conductivity of the rainwater is ≥50 μS / mm, the control device opens the solenoid valve; otherwise, the solenoid valve closes, allowing rainwater to infiltrate directly via runoff.

[0015] As a preferred embodiment of the present invention, the inclined filter tube is mounted with a fixing member, to which a telescopic rod is connected. The output end of the telescopic rod is connected to an annular scraper, which is positioned closely against the inner wall of the inclined filter tube. The telescopic rod drives the annular scraper to move, thereby scraping off sediment on the inclined filter tube.

[0016] As a preferred solution of the present invention, a slag discharge trough is provided on the water weir, and a slag discharge spiral is installed in the slag discharge trough. The slag discharge spiral in the slag discharge trough can discharge impurities.

[0017] As a preferred embodiment of the present invention, a sludge suction mechanism is further included. The bottom of the sedimentation tank and the bottom of the treatment tank are both provided with a sludge discharge port, and the sludge suction mechanism is connected to the sludge discharge port. The sludge suction mechanism can extract the sludge deposited in the sedimentation tank and the treatment tank.

[0018] As a preferred embodiment of the present invention, a curved partition wall is provided in the middle of the treatment tank along the direction of water flow. The curved partition wall can enhance the turbulence effect of the water flow, thereby improving the water treatment effect.

[0019] As a preferred embodiment of the present invention, a scraping mechanism is provided within the treatment tank. The scraping mechanism comprises a chute fixed to the treatment tank, a scraping rod sleeved within the chute, and a scraping assembly mounted on the other end of the scraping rod, the scraping assembly being closely attached to the bottom of the treatment tank. As the scraping rod moves within the chute, the scraping assembly on the scraping rod scrapes away sludge deposited within the treatment tank.

[0020] As a preferred embodiment of the present invention, the scraper assembly includes a curved scraper fixed to a scraper rod, one end of the curved scraper being connected to a spring, the other end of the spring being connected to a linear scraper. The sidewalls and bottom of the treatment tank transition smoothly, the transition section between the sidewalls and bottom of the treatment tank being in contact with the curved scraper, and one side of the linear scraper being in contact with the curved partition wall. The bottom of the treatment tank is curved to improve water flow capacity, and the surface is polished to improve light reflection and reduce light dissipation. The linear scraper is connected to the curved scraper via a spring, so that the linear scraper can adapt to the shape of the curved partition wall, ensuring that the linear scraper can move along the curved partition wall and ensure that the sludge at the bottom of the treatment tank is fully scraped.

[0021] As a preferred embodiment of the present invention, the liquid collecting pipeline is further connected with a dosing system for adding flocculants, which adds flocculants such as PAC and PAM to the influent water.

[0022] The beneficial effects of the present invention are:

[0023] The pretreatment tank of the present invention processes rainwater drawn from the grass-planting ditch. The treated rainwater then flows through the water inlet into the sedimentation tank, where the inclined filter tubes thoroughly filter the rainwater. The filtered rainwater then flows through the weir into the treatment tank, where photocatalytic rods and UV lamps treat the rainwater, improving the removal of difficult-to-degrade organic matter in the initial rainwater. The treated clean water then flows through a permeable wall into a water storage tank, where the water can be used to irrigate vegetation, allowing the treated rainwater to be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of the first aspect of the present invention;

[0025] Figure 2 It is a structural diagram of the second aspect of the present invention;

[0026] Figure 3 It is a structural diagram of the core processing module;

[0027] Figure 4 This is a partial structural diagram of the core processing module;

[0028] Figure 5 It is a structural diagram of the filter inclined tube;

[0029] Figure 6 It is a structural diagram of the pretreatment tank;

[0030] Figure 7 It is a structural diagram of the aeration system;

[0031] Figure 8 It is a structural diagram of the sludge suction mechanism;

[0032] Figure 9It is a partial structural diagram of the sedimentation tank;

[0033] Figure 10 It is a structural diagram of the water weir;

[0034] Figure 11 It is a structural diagram of the treatment tank;

[0035] Figure 12 It is a partial structural diagram of the treatment tank;

[0036] Figure 13 It is a structural diagram of the mud scraping mechanism;

[0037] Figure 14 This is a schematic diagram of the structure of a water purification tank.

[0038] Figure: 1-pretreatment tank; 2-sedimentation tank; 3-treatment tank; 4-purification tank; 5-grass ditch; 6-water storage tank; 7-sludge suction mechanism; 8-sludge scraping mechanism; 11-liquid collection pipeline; 12-partition wall; 13-water inlet; 14-microwave generator; 15-aeration system; 21-filter inclined tube; 22-water weir; 23-partition plate; 24-fixing part; 25-telescopic rod; 26-annular scraper; 31-photocatalytic rod; 32-UV lamp ;33-permeable wall;34-arc partition wall;41-water inlet;51-drip pipe;71-sludge suction box;72-sludge discharge port;73-sludge suction pipe;81-chute;82-sludge scraper rod;83-sludge scraper assembly;111-water quality detection module;151-air storage tank;152-injection pipe;153-aeration plate;221-slag discharge trough;222-slag discharge spiral;831-arc scraper;832-spring;833-straight scraper. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features therein may be combined with each other unless there is a conflict.

[0041] like Figures 1 to 14As shown, the initial rainwater collection, treatment and reuse device along the road of this embodiment includes a pretreatment tank 1, a sedimentation tank 2, a treatment tank 3 and a clean water tank 4 arranged in sequence, a liquid collection pipe 11 is connected between the pretreatment tank 1 and the grass-planted ditch 5, a partition wall 12 is arranged between the pretreatment tank 1 and the sedimentation tank 2, a water outlet 13 is arranged on the lower side of the partition wall 12, a plurality of filtering inclined tubes 21 are arranged in the sedimentation tank 2, a water weir 22 is arranged between the sedimentation tank 2 and the treatment tank 3, a plurality of photocatalytic rods 31 and a plurality of UV lamps 32 are arranged in the treatment tank 3, a permeable wall 33 is arranged between the treatment tank 3 and the clean water tank 4, the clean water tank 4 is connected to the water storage tank 6 through a pipeline, a drip pipe 51 is arranged on the grass-planted ditch 5, and the drip pipe 51 is connected to the water storage tank 6.

[0042] Pretreatment tank 1, sedimentation tank 2, treatment tank 3, and clean water tank 4 are housed in a single housing, serving as the core treatment module. Designed in accordance with the "Technical Standard for Modular Rainwater Storage Facilities CJJ / T311-2020," the core treatment module should be installed on a reinforced concrete or concrete, compacted natural soil base paved with a composite geomembrane or geotextile. The core treatment module can have various shapes, adapted to the specific site. A built-in pressure pump within the water storage tank 6 delivers clean water to the vegetation irrigation system.

[0043] The surface of the photocatalytic rod 31 is coated with high-efficiency photocatalytic materials such as titanium dioxide, zinc oxide, bismuth oxyhalide, etc. The UV lamp 32 is selected according to the initial rainwater pollution in different areas, such as UVA, UVB, UVC, etc.

[0044] The pretreatment tank 1 of the present invention processes rainwater drawn from the grass-planting ditch 5. The treated rainwater flows through the water inlet 13 into the sedimentation tank 2, where the inclined filter tube 21 thoroughly filters the rainwater. The filtered rainwater then flows through the weir 22 into the treatment tank 3, where the photocatalytic rods 31 and UV lamps 32 treat the rainwater, effectively removing recalcitrant organic matter from the initial rainwater. The treated clean water then flows through the permeable wall 33 into the water storage tank 6, where the water can be used to irrigate vegetation, allowing the treated rainwater to be reused.

[0045] A water inlet 13 is provided on the lower side of the partition wall 12 so that the pre-treated rainwater enters the sedimentation tank 2 from the lower part. The rainwater can be fully filtered through the filtering inclined tube 21, thereby improving the filtering effect.

[0046] The pretreatment tank 1 is equipped with a microwave generator 14 and an aeration system 15. Aeration system 15 uses microporous aeration to mix and agitate the water, increasing DO (dosing rate), thereby improving the effectiveness of subsequent advanced oxidation treatment processes. Microwave generator 14 is used to break down emulsion droplets and other large aggregates in the incoming water and degrade some organic pollutants.

[0047] Aeration system 15 includes an air tank 151 connected to an air jet line 152. The other end of air jet line 152 is connected to a plurality of aeration plates 153, which are located within pretreatment tank 1. Air jet line 152 is equipped with an on / off valve that opens when water enters pretreatment tank 1 and closes when water enters pretreatment tank 1. Air jet line 152 is also equipped with a pressure gauge to monitor the pressure within air tank 151. Air jet line 152 also has an air supply port, which can be equipped with an air compressor pump for constant replenishment, or manually replenished.

[0048] The liquid collection pipeline 11 is equipped with a water quality detection module 111 and a solenoid valve. The water quality detection module 111 is electrically connected to a control device, which is in turn electrically connected to the solenoid valve. The water quality detection module 111 includes a conductivity monitoring device for measuring the conductivity of the incoming water. When the conductivity of the rainwater is ≥50 μS / mm, the control device opens the solenoid valve; otherwise, the solenoid valve closes, allowing rainwater to infiltrate directly via runoff.

[0049] The liquid collecting pipeline 11 is also connected to a dosing system for adding flocculants. The dosing system adds flocculants, such as PAC and PAM, to the influent water.

[0050] The bottoms of both the sedimentation tank 2 and the treatment tank 3 are provided with sludge discharge ports 72. The present invention also includes a sludge suction mechanism 7, which comprises a sludge suction box 71, within which a sludge suction pump is installed. A sludge suction pipe 73 connects the inlet of the sludge suction pump to the sludge discharge port 72. The sludge suction mechanism 7 is capable of extracting sludge deposited in the sedimentation tank 2 and the treatment tank 3. After a single filtration cycle, the solenoid valve on the liquid collection line 11 is closed. A certain amount of water remains in the pretreatment tank 1, sedimentation tank 2, and treatment tank 3, and the remaining wastewater is extracted by the sludge suction mechanism 7.

[0051] The filter inclined tubes 21 are densely distributed in the sedimentation tank 2, with a diameter of 10 to 20 cm and a length designed according to the height of the sedimentation tank 2, generally 1 / 2 to 1 / 3 of the height of the sedimentation tank 2. A partition plate 23 is provided in the sedimentation tank 2, and a number of filter inclined tubes 21 are provided on both sides of the partition plate 23. A fixing member 24 is installed on the filter inclined tube 21, and a telescopic rod 25 is connected to the fixing member 24. The output end of the telescopic rod 25 is connected to an annular scraper 26, and the annular scraper 26 is arranged close to the inner wall of the filter inclined tube 21. After completing a filtration, the telescopic rod 25 drives the annular scraper 26 to move, so that the annular scraper 26 can scrape off the sediment on the filter inclined tube 21, making it easier to discharge the sludge through the sludge suction mechanism 7. The bottom of the sedimentation tank 2 is tilted downward toward the sludge discharge port 72 to reduce the residual sewage in the sedimentation tank 2.

[0052] The volume of sedimentation tank 2 is calculated in accordance with the "Technical Standard for Modular Rainwater Storage Facilities CJJ / T 311-2020".

[0053] The weir 22 is provided with a slag discharge chute 221, within which a slag discharge screw 222 is installed. The slag discharge screw 222 in the chute 221 discharges impurities. One end of the slag discharge screw 222 is connected to a drive motor, and the other end of the slag discharge screw 222 is provided with a temporary storage bin. The drive motor drives the slag discharge screw 222 to discharge slag, while the temporary storage bin temporarily stores impurities.

[0054] Furthermore, a curved partition wall 34 is installed in the middle of the treatment tank 3, along the direction of water flow. This wall 34 increases water turbulence, thereby improving water treatment efficiency. UV lamps 32 are positioned along this curved partition wall 34, and their shape is the same as the curved partition wall 34, improving the uniformity of the UV lamps 32 in rainwater treatment.

[0055] To facilitate scraping of sludge within the processing tank 3, a scraping mechanism 8 is provided within the processing tank 3. The scraping mechanism 8 comprises a chute 81 fixed to the processing tank 3. A scraping rod 82 is sleeved within the chute 81. A scraping assembly 83 is mounted on the other end of the scraping rod 82, which is positioned against the bottom of the processing tank 3. As the scraping rod moves within the chute 81, the scraping assembly 83 on the scraping rod scrapes away accumulated sludge within the processing tank 3. A drive device is provided within the chute 81 to drive the scraping rod, facilitating automatic movement of the scraping rod.

[0056] The scraper assembly 83 includes a curved scraper 831 fixed to the scraper rod 82. One end of the curved scraper 831 is connected to a spring 832, and the other end of the spring 832 is connected to a linear scraper 833. The sidewalls and bottom of the treatment tank 3 transition smoothly, and the transition section between the sidewalls and the bottom of the treatment tank 3 is in contact with the curved scraper 831. One side of the linear scraper 833 is in contact with the curved partition wall 34. The bottom of the treatment tank 3 is curved to improve water flow capacity, and the surface is polished to improve light reflection and reduce light dissipation. The linear scraper 833 is connected to the curved scraper 831 via the spring 832, so that the linear scraper 833 can adapt to the shape of the curved partition wall 34, ensuring that the linear scraper 833 can move along the curved partition wall 34 and ensure that the sludge at the bottom of the treatment tank 3 is fully scraped.

[0057] A water extraction port 41 is provided in the clean water tank 4 . One side surface of the clean water tank 4 is connected to the ground to form an integral arc shape. The water extraction port 41 is located at the lowest position of the clean water tank 4 .

[0058] The present invention is a highly efficient, intelligent, and controllable technology for deep purification of primary rainwater. By introducing advanced oxidation technology, the removal effect of difficult-to-degrade organic matter in primary rainwater is improved. By introducing an inclined tube and microwave generator 14 system, the efficiency of primary rainwater treatment is further improved.

[0059] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that falls within the scope defined by the claims of the present invention falls within the scope of protection of the present invention.

Claims

1. A device for collecting, treating and reusing initial rainwater along a road, characterized by: The invention comprises a pretreatment tank (1), a sedimentation tank (2), a treatment tank (3) and a water purification tank (4) which are arranged in sequence. A liquid collecting pipeline (11) is connected between the pretreatment tank (1) and the grass planting ditch (5). A partition wall (12) is arranged between the pretreatment tank (1) and the sedimentation tank (2). A water outlet (13) is arranged on the lower side of the partition wall (12). A plurality of filtering inclined tubes (21) are arranged in the sedimentation tank (2). A water weir (22) is arranged between the sedimentation tank (2) and the treatment tank (3). A plurality of photocatalytic rods (31) and a plurality of UV lamps (32) are arranged in the treatment tank (3). A permeable wall (33) is arranged between the treatment tank (3) and the water purification tank (4). The water purification tank (4) is connected to a water storage tank (6) through a pipeline. A dripping pipeline (51) is arranged on the grass planting ditch (5). The dripping pipeline (51) is communicated with the water storage tank (6). The filtering inclined tube (21) is provided with a fixing member (24), the fixing member (24) is connected to a telescopic rod (25), the output end of the telescopic rod (25) is connected to an annular scraper (26), and the annular scraper (26) is arranged close to the inner wall of the filtering inclined tube (21); An arc-shaped partition wall (34) is provided in the middle of the processing tank (3) along the direction of water flow; a mud scraping mechanism (8) is provided in the processing tank (3), and the mud scraping mechanism (8) comprises a chute (81) fixed on the processing tank (3); a mud scraping rod (82) is sleeved in the chute (81); a mud scraping assembly (83) is installed at the other end of the mud scraping rod (82); and the mud scraping assembly (83) is closely attached to the bottom of the processing tank (3).

2. The device for collecting, treating and reusing initial rainwater along a road according to claim 1, characterized in that: A microwave generator (14) and an aeration system (15) are installed in the pretreatment tank (1).

3. The device for collecting, treating and reusing initial rainwater along a road according to claim 1, characterized in that: A water quality detection module (111) and an electromagnetic valve are installed on the liquid collecting pipeline (11); the water quality detection module (111) is electrically connected to a control device, and the control device is electrically connected to the electromagnetic valve.

4. The device for collecting, treating and reusing initial rainwater along a road according to claim 1, characterized in that: A slag discharge trough (221) is provided on the water weir (22), and a slag discharge screw (222) is installed in the slag discharge trough (221).

5. The device for collecting, treating and reusing initial rainwater along a road according to claim 1, characterized in that: It also includes a sludge suction mechanism (7). The bottom of the sedimentation tank (2) and the bottom of the treatment tank (3) are both provided with a sludge discharge port (72), and the sludge suction mechanism (7) is connected to the sludge discharge port (72).

6. The device for collecting, treating and reusing initial rainwater along a road according to claim 1, characterized in that: The scraping assembly (83) comprises an arc-shaped scraper (831) fixed to the scraping rod (82); one end of the arc-shaped scraper (831) is connected to a spring (832); the other end of the spring (832) is connected to a straight scraper (833); the side wall and the bottom of the processing tank (3) are smoothly transitioned; the transition section between the side wall and the bottom of the processing tank (3) is in contact with the arc-shaped scraper (831); and one side of the straight scraper (833) is in contact with the arc-shaped partition wall (34).

7. The device for collecting, treating and recycling initial rainwater along a road according to any one of claims 1 to 6, characterized in that: The liquid collecting pipeline (11) is also connected to a dosing system for adding flocculants.

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