Sponge city rainwater collecting and purifying system

Abstract

The invention relates to a sponge city rainwater collection and purification system. The system comprises a rainwater collection unit, a plant purification unit, a biochemical treatment unit and a storage unit which are arranged in sequence; the rainwater collection unit is used for collecting, filtering and precipitating medium-term rainwater and introducing the medium-term rainwater into the plant purification unit; the plant purification unit is used for carrying out ecological conservation and purification treatment through aquatic purification plants and introducing the sewage subjected to ecological conservation and purification treatment into the biochemical treatment unit; the biochemical treatment unit is used for carrying out deep treatment on the rainwater and carrying out biochemical treatment on the rainwater through flocculation stirring, aeration and medicament disinfection; the storage unit is used for storing the purified rainwater, continuously monitoring the water quality of the stored purified water through a water quality monitoring mechanism, and outwards conveying the purified water meeting the water quality requirement. The rainwater storage device has the advantages of performing multifunctional treatment on rainwater, improving the cleanliness of the rainwater, facilitating long-term storage and the like, and the problem that the use scene is limited due to the fact that traditional rainwater storage time is short is solved.

Description

Technical Field

[0001] The present application relates to the technical field of rainwater collection and purification, and in particular to a sponge city rainwater collection and purification system. Background Art

[0002] Sponge cities aim to improve a city’s ability to absorb, store, infiltrate, purify, use and discharge rainwater by simulating the natural hydrological cycle.

[0003] Existing technologies often employ low-impact development measures such as permeable pavement, green roofs, and rain gardens to increase rainwater infiltration, promote rainwater collection and utilization, replenish groundwater, and conserve water resources. Rainwater collection and purification are key components of achieving "water resilience" in sponge cities, promoting sustainable development by coupling the natural hydrological cycle with urban functions.

[0004] In sponge cities, the collection and utilization of rainwater is simply collected and filtered, and it is difficult to clean up the impurities mixed in the rainwater. After the rainwater is collected, the impurities in the rainwater are easy to breed bacteria, making it difficult to store for a long time. In addition, the scenarios for the later use of rainwater are limited, which interferes with the recycling of water in sponge cities. Based on this, a multifunctional rainwater collection and purification module for sponge cities is proposed to solve the above problems. Summary of the Invention

[0005] The purpose of this application is to provide a sponge city rainwater collection and purification system, which has the advantages of multi-functional treatment of rainwater, improving the cleanliness of rainwater, and facilitating long-term storage, thereby solving the problem of limited usage scenarios caused by the short storage time of traditional rainwater.

[0006] In order to achieve the above-mentioned object, the present invention provides a sponge city rainwater collection and purification system, comprising: a rainwater collection unit, a plant purification unit, a biochemical treatment unit and a storage unit arranged in sequence; The rainwater collection unit is used to collect, filter and precipitate mid-term rainwater, and pass it into the plant purification unit; The plant purification unit is used to perform ecological conservation and purification treatment through aquatic purification plants, and pass the sewage after ecological conservation and purification treatment into the biochemical treatment unit; The biochemical treatment unit is used to perform deep treatment on rainwater, and performs biochemical treatment of rainwater through flocculation, aeration and disinfection with chemicals; The storage unit is used to store the purified rainwater, continuously monitor the water quality of the stored purified water through a water quality monitoring mechanism, and transport the purified water that meets the water quality requirements to the outside.

[0007] In an optional embodiment, the rainwater collection unit includes a collection channel for receiving mid-term rainwater and distributed on both sides of the urban road, and a rainwater collection tank; A plurality of water collection control boxes are provided below the water collection channel, and a water collection branch pipe is connected to the bottom of each water collection control box. The water collection branch pipes merge and intersect into a water collection main pipe, and the water collection main pipe extends to the upper part of the rainwater collection tank.

[0008] In an optional embodiment, a movably detachable waterway filter is provided at the bottom of the water collection channel, and a horizontally slidable blocking plate is provided on the top of the water collection control box. The blocking plate is provided below the waterway filter and can be pushed and pulled on the water collection control box. The size of the blocking plate is larger than the cross-sectional size of the water collection control box, and the blocking plate can completely block the buckle cover of the water collection control box; The side of the water collection control box is connected with a bracket, and a telescopic mechanism is installed on the bracket. The telescopic rod of the telescopic mechanism is fixedly connected to the blocking plate.

[0009] In an optional embodiment, the rainwater collection tank includes a filter box located at the top, the water collection main pipe extends above the filter box, and the filter box is installed on the water inlet side of the rainwater collection tank through a bracket; The filter box includes a grid bottom plate and a movably detachable filter box filter screen. A plurality of support blocks are provided on the inner side wall of the filter box. The filter box filter screen is overlapped on the middle and upper part of the filter box through the support blocks. The filter screen of the filter box is fitted with a gap between the filter box, and a water drop space of at least a certain height is left between the filter screen of the filter box and the grille bottom plate.

[0010] In an optional embodiment, the rainwater collection tank includes a straight tank section and a sediment cone located at the bottom of the straight tank section, the filter box is arranged on the top of the straight tank section, and a sludge pump is installed on the top of the rainwater collection tank. The sludge pump is connected to a sludge inlet pipe and a sludge discharge pipe, and the bottom end of the sludge inlet pipe extends into the bottom of the sediment cone; A water guide pump is provided at the top of the rainwater collecting tank on the other side of the filter box. The water guide pump is connected to a water collecting pumping pipe and a water collecting drainage pipe. The bottom end of the water collecting pumping pipe is not lower than the bottom end of the straight box section. The water collecting drainage pipe is used to discharge the mid-term rainwater after collecting and filtering the sediment to the plant purification unit.

[0011] In an optional embodiment, the plant purification unit includes a plant planting frame, and a plurality of plant planting boxes overlapped and installed on the plant planting frame; Each of the plant planting boxes is filled with a mixed matrix for plant growth, and the plurality of plant planting boxes are arranged flat on top of the plant planting frame with the top surface flush with the ground, and the water collection and drainage pipes extend to the top of the side of the plant planting box; A gap space is left between the bottom wall of the plant planting frame and the bottom wall of the plant planting box for the growth of the roots of aquatic purification plants, and purification fillers are stacked in the gap space. The bottom wall of the plant planting box is provided with plant planting holes for the plant roots to extend downward, and the plant planting frame is connected to a biochemical treatment water inlet pipe.

[0012] In an optional embodiment, the biochemical treatment unit includes a treatment water tank, and the treatment water tank includes an open structure at the top and the top surface is flush with the ground; The treatment water tank includes a flocculation zone, an aeration zone and a disinfection zone arranged in sequence, and a water delivery pump is provided in each of the flocculation zone, the aeration zone and the disinfection zone; A mounting hanger is provided on the top of the flocculation zone, a flocculation stirrer is mounted on the mounting hanger, the flocculation stirrer comprises a stirring motor and a stirring frame, and the stirring motor is connected to the mounting hanger.

[0013] In an optional embodiment, an aeration device is provided in the aeration zone, and the aeration device includes an aeration pump provided at the top of the aeration zone, the aeration pump is connected to an aeration main pipe, the aeration main pipe is connected to an aeration branch pipe, and the aeration branch pipe extends into the bottom of the treatment tank; A plurality of aeration holes are evenly distributed on the bottom wall of the aeration branch pipe, and the aeration holes are used to inject air or pure oxygen into the rainwater in the treatment tank for aerobic microbial biochemical treatment; The storage unit includes a clean water storage tank, the water delivery pump in the disinfection area is connected to a clean water delivery pipeline, and the clean water delivery pipeline is connected to the clean water storage tank.

[0014] In an optional embodiment, the clean water storage tank is provided with an external water pump and a clean water external transmission pipeline connected to the external water pump, for externally transmitting the clean water in the clean water storage tank; The water quality monitoring mechanism includes a water quality treatment machine.

[0015] In an optional embodiment, the clean water storage tank is provided with a floating ruler for indicating the water level.

[0016] By sequentially arranging rainwater collection units, plant purification units, biochemical treatment units and storage units, mid-term rainwater filtration and collection, preliminary sedimentation, plant ecological conservation and purification, and biochemical treatment can be carried out respectively, thereby realizing a comprehensive treatment form with different combinations of multiple functions.

[0017] The rainwater collection unit can control the collection components during the mid-term rainwater collection period, thereby avoiding the collection of initial rainwater and final rainwater, and fully recycling the mid-term rainwater with a low degree of pollution.

[0018] The plant purification unit purifies collected, filtered, and settled rainwater through ecological conservation, thereby reducing the impact of subsequent biochemical treatment units. The plant purification unit includes aquatic and emergent plants, with purification fillers located beneath the plant layer. This unit boasts high ecological conservation capacity, ensuring that rainwater physically filtered and settled in the collection unit is purified and treated through plant growth to improve water quality.

[0019] The biochemical treatment unit is mainly used as the deep purification of the rainwater collection and purification system in this application. The rainwater is biochemically treated in the stages of flocculation stirring, aeration and chemical disinfection in sequence, and then the rainwater is deeply treated to ensure that the purified water quality meets the standards.

[0020] The storage unit is used to store rainwater that has been purified in sequence by different upstream units. The water quality of the stored purified water is continuously monitored by the water quality monitoring agency. When there is a specific water demand externally, the purified water that meets the water quality requirements is transported outward to achieve the purpose of external water supply.

[0021] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a schematic diagram of the overall structure of the sponge city rainwater collection and purification system for this application; Figure 2 This is a schematic diagram of the structure of the rainwater collection unit in this application; Figure 3 This is a schematic diagram of the structure of the water collection channel, water collection control box and telescopic mechanism in this application; Figure 4 This is a schematic diagram of the installation structure of the filter box in this application; Figure 5 This is a schematic diagram of the structure of the plant purification unit in this application; Figure 6 Schematic diagram of the internal structure of the biochemical treatment unit in this application; Figure 7Schematic diagram of the structure of the aeration device in this application.

[0024] icon: 1-rainwater collection unit; 11-collection waterway; 111-waterway filter; 12-Rainwater collection tank; 121-Straight tank section; 122-Sludge cone bucket; 123-Sludge pump; 124-Sludge inlet pipe; 125-Sludge discharge pipe; 126-Water diversion pump; 127-Water collection pumping pipe; 128-Water collection discharge pipe; 13-water collection control box; 131-blocking plate; 132-telescopic mechanism; 14-water collection branch pipe; 15-water collection main pipe; 16- filter box; 161- grid bottom plate; 162- filter box filter; 163- support block; 2-Plant purification unit; 21-Plant planting frame; 22-Plant planting box; 23-Mixed matrix; 24-Purification filler; 25-Plant planting hole; 26-Biochemical treatment water inlet pipe; 3-Biochemical treatment unit; 30-Treatment tank; 31-Flocculation area; 32-Aeration area; 33-Disinfection area; 34-Water pump; 35-Mounting bracket; 36-Flocculation stirrer; 37-Stirring motor; 38-Stirring frame; 39- aeration device; 391- aeration main pipe; 392- aeration branch pipe; 393- aeration hole; 394- aeration pump; 4-storage unit; 40-clean water storage tank; 41-clean water transmission pipeline; 42-external water pump; 43-clean water external transmission pipeline; 44-water quality monitoring mechanism; 45-floating scale. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0026] In the description of this application, it should be noted that the terms "inner" and "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0027] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0028] The sponge city rainwater collection and purification system in this application mainly performs comprehensive treatment on mid-term rainwater through a combination of different treatment units to improve the cleanliness of rainwater, thereby being able to meet the multifunctional collection and purification of mid-term rainwater, and solving the technical problem in the existing technology that simply collecting and filtering rainwater cannot be stored for a long time.

[0029] See also Figure 1 The main unit of the sponge city rainwater collection and purification system includes a rainwater collection unit 1, a plant purification unit 2, a biochemical treatment unit 3 and a storage unit 4, which are arranged in sequence; The rainwater collection unit 1 is used to collect, filter and precipitate mid-term rainwater, and pass it into the plant purification unit 2; The plant purification unit 2 is used to perform ecological conservation and purification treatment through aquatic purification plants, and pass the sewage after ecological conservation and purification treatment into the biochemical treatment unit 3; The biochemical treatment unit 3 is used to perform deep treatment on rainwater, and performs biochemical treatment on rainwater through flocculation, aeration and disinfection. The storage unit 4 is used to store the purified rainwater, continuously monitor the water quality of the stored purified water through the water quality monitoring mechanism 44, and transport the purified water that meets the water quality requirements to the outside.

[0030] Through the phase sequence connection of the above-mentioned different treatment units, the mid-term rainwater can be subjected to physical filtration and sedimentation, ecological conservation and purification, deep biochemical treatment and storage of clean rainwater in turn, meeting the deep requirements for rainwater collection, purification and storage in sponge cities, and providing recycled rainwater with higher cleanliness.

[0031] From the perspective of cross-integration of different treatment units, the rainwater collection unit 1 can be used to selectively collect, filter and precipitate mid-term rainwater, and through the ecological conservation capacity of the plant purification unit 2, the rainwater that has been initially physically purified by the rainwater collection unit 1 can be subjected to plant purification. Finally, the rainwater that has been purified by plants can be screened and processed by the biochemical treatment unit 3 to maximize the cleanliness of the recycled rainwater.

[0032] At the same time, the storage unit 4 can store the clean water after biochemical treatment, and in combination with the water quality monitoring mechanism 44, monitor the water quality of the stored purified water in real time and continuously. The water quality monitoring mechanism 44 is specifically in the form of an automatic water quality treatment machine, which can perform auxiliary purification treatment to facilitate later use, thereby effectively solving the problem in the existing technology that the purified rainwater does not meet the long-term storage conditions.

[0033] Combine Figure 2-Figure 4 From the perspective of source rainwater collection, the rainwater collection unit 1 includes a collection channel 11 for receiving mid-term rainwater and distributed on both sides of the urban roads. The collection channel 11 distributed on both sides of the urban roads can ensure the coverage of rainwater collection.

[0034] At the same time, the rainwater after preliminary filtration flows into the rainwater collecting tank 12 for physical sedimentation. A plurality of water collection control boxes 13 are arranged under the collection water channel 11. The water collection control box 13 can control the introduction of the rainwater tank in the collection water channel 11 into the rainwater collecting tank 12 by opening and closing the sealing plate 131 located at the top thereof.

[0035] The bottom of each water collection control box 13 is connected to a water collection branch pipe 14, and the water collection branch pipes 14 merge and intersect at the water collection main pipe 15. By extending the water collection main pipe 15 to the upper part of the rainwater collection tank 12, rainwater can be collected into the rainwater collection tank 12 through the water collection branch pipes 14 and the water collection main pipe 15.

[0036] From the perspective of preliminary filtration of collected rainwater, a detachable waterway filter 111 is provided at the bottom of the collection waterway 11. The recycled rainwater is preliminarily filtered through the waterway filter 111. The detachable waterway filter 111 is convenient for later replacement and maintenance.

[0037] A horizontally sliding blocking plate 131 is provided on the top of the water collection control box 13. The blocking plate 131 is provided below the water channel filter 111 and can be pushed and pulled on the water collection control box 13. When the blocking plate 131 is pulled out, the collection water channel 11 can be communicated with the water collection control box 13, and the rainwater after preliminary filtration is introduced into the water collection control box 13.

[0038] The rainwater collection in this application is mainly for recycling mid-term rainwater with low pollution level. In the initial rainwater and late rainwater stages, the top of the water collection control box 13 is blocked by pushing the sealing plate 131 forward to isolate the space between the collection water channel 11 and the water collection control box 13.

[0039] In the middle rain stage, the blocking plate 131 is pulled back to make way for the water inlet opening on the top of the water collection control box 13, so that the rainwater after preliminary filtration can be introduced.

[0040] In order to ensure the isolation effect, the size of the sealing plate 131 is larger than the cross-sectional size of the water collection control box 13, and the sealing plate 131 can completely seal the cover of the water collection control box 13. Preferably, the top of the water collection control box 13 is opened to completely seal the cover to prevent non-mid-term rainwater with a high degree of pollution from entering the purification system and increasing the load of the purification system.

[0041] From the perspective of push-pull control of the blocking plate 131, the blocking plate 131 is specifically controlled by the telescopic mechanism 132. A bracket is connected to the side of the water collection control box 13, and the telescopic mechanism 132 is connected and installed on the bracket. Furthermore, by fixedly connecting the telescopic rod of the telescopic mechanism 132 to the side of the blocking plate 131, it can be extended and retracted under the drive of the telescopic rod of the telescopic mechanism 132. Preferably, the telescopic mechanism 132 can be selected as a structural form of an electric push rod. After the end of the blocking plate 131 is fixedly connected to the electric push rod, the electric push rod can control the blocking plate 131 to be extended and retracted relative to the water collection control box 13 and the bracket under the support and fixation of the bracket, thereby completing the opening and closing control of the water inlet opening at the top of the water collection control box 13.

[0042] On the basis of collecting rainwater through the water collection branch pipes 14 and the water collection main pipe 15 in different water collection control boxes 13, and filtering it once through the waterway filter 111, in order to be able to perform double filtration on the rainwater entering the rainwater collection tank 12, the rainwater collection tank 12 includes a filter box 16 located at the top, the water collection main pipe 15 extends to the top of the filter box 16, and the filter box 16 is installed on the water inlet side of the rainwater collection tank 12 through a bracket.

[0043] The filter box 16 includes a grille bottom plate 161 and a movably detachable filter box filter screen 162. The grille bottom plate 161 is mainly used for water leakage, while the movably detachable filter box filter screen 162 performs secondary filtration and is convenient for later maintenance and replacement.

[0044] A plurality of support blocks 163 are provided on the inner wall of the filter box 16, and the filter box screen 162 is movably overlapped on the middle and upper part of the filter box 16 through the support blocks 163. At the same time, the filter box screen 162 is loosely matched with the filter box 16 to meet the requirement that the filter box screen 162 can be disassembled and replaced.

[0045] There is at least a certain height of water drop space between the filter box filter screen 162 and the grid bottom plate 161, which can form an oxygen-rich state of the water drop to a certain extent, thereby providing an oxygen-rich environment for the subsequent plant purification.

[0046] The rainwater collecting tank 12 in the present invention includes a straight box section 121 and a sediment cone hopper 122 located at the bottom of the straight box section 121. The rainwater collecting tank 12 is mainly used for sedimentation of recovered rainwater. The straight box section 121 has a certain height and is mainly used to accommodate clean water after sedimentation, while the sediment cone hopper 122 is specifically used to accommodate settled bottom mud.

[0047] The filter box 16 is arranged on the top of the straight box section 121. A sludge pump 123 is installed on the top of the rainwater collecting tank 12. The sludge pump 123 is connected to a mud inlet pipe 124 and a mud discharge pipe 125. The bottom end of the mud inlet pipe 124 extends into the bottom of the mud cone hopper 122, which can regularly discharge the bottom mud in the mud cone hopper 122 to ensure effective sedimentation space for the rainwater collecting tank 12.

[0048] A water guide pump 126 is provided at the top of the rainwater collecting tank 12 on the other side of the filter box 16 for guiding the clean water above the bottom mud to the downstream.

[0049] The water guide pump 126 is connected to a water collecting and pumping pipe 127 and a water collecting and draining pipe 128. The bottom end of the water collecting and pumping pipe 127 is not lower than the bottom end of the straight box section 121 to avoid bringing out the sediment.

[0050] The water collection and drainage pipe 128 is used to discharge the mid-term rainwater after collecting and filtering the sediment to the plant purification unit 2 for plant purification treatment by the plant purification unit 2.

[0051] Combine Figure 5 The plant purification unit 2 includes a plant planting frame 21 and a plurality of plant planting boxes 22 mounted on the plant planting frame 21 .

[0052] Each plant box 22 is filled with a mixed matrix 23 for plant growth. The mixed matrix 23 not only supports the growth of aquatic plants or emergent plants, but also acts as a filter. Furthermore, the mixed matrix 23 creates an environment for microbial survival, ensuring that plant roots effectively process recycled rainwater.

[0053] A plurality of plant planting boxes 22 are laid flat on the top of the plant planting frame 21 and the top surface is flush with the ground, which is convenient for planting operations. At the same time, the water collection and drainage pipe 128 extends to the upper part of the side of the plant planting box 22, which can guide the clean water from the upper layer of the rainwater collection tank 12 into the plant planting box 22. Further, combined with the spatial communication between the plant planting box 22 and the plant planting frame 21, the clean water can enter the plant planting frame 21 through the plant planting hole 25 at the bottom of the plant planting box 22.

[0054] A gap space is left between the bottom wall of the plant planting frame 21 and the bottom wall of the plant planting box 22 for the growth of the roots of the aquatic purification plants, so as to facilitate the growth of the roots of the purification plants.

[0055] Furthermore, in order to ensure the purification effect of the plant purification unit 2 on rainwater, purification fillers 24 are stacked in the gap space. The rainwater treated by the mixed matrix 23 can be further filtered and purified in the purification filler 24. Under the purification action of the mixed matrix 23, the rainwater will produce some ecological sludge. The ecological sludge can be filtered out by filtering the purification filler 24, thereby reducing the processing load of the subsequent biochemical treatment unit 3.

[0056] The plurality of plant planting boxes 22 are specifically connected as an integral structure, and are laid flat and overlapped on the plant planting frame 21 . This arrangement facilitates the replacement of the purification filler 24 .

[0057] The bottom wall of the plant planting box 22 is provided with plant planting holes 25 for the plant roots to extend downward, so that the roots of the purification plants can extend into the plant planting frame 21, thereby widening the coverage of the plant purification.

[0058] The plant planting frame 21 is connected to a biochemical treatment water inlet pipe 26 , which can guide the rainwater that has been ecologically purified by aquatic plants or water-rising plants in the plant purification unit 2 into the downstream biochemical treatment unit 3 .

[0059] Combine Figure 6-Figure 7 The biochemical treatment unit 3 includes a treatment water tank 30 . The treatment water tank 30 includes an open structure at the top and the top surface is flush with the ground. The treatment water tank 30 constitutes the structural main body of the biochemical treatment unit 3 .

[0060] The treatment tank 30 includes a flocculation zone 31, an aeration zone 32 and a disinfection zone 33 arranged in sequence, which can perform flocculation stirring, aeration treatment and chemical disinfection respectively. The open top surface of the treatment tank 30 is flush with the ground, which makes it convenient to use an external mobile suction pump to extract and clean the sediment in the flocculation zone 31, the aeration zone 32 and the disinfection zone 33.

[0061] From the perspective of sequentially performing flocculation stirring, aeration treatment and chemical disinfection, water pumps 34 are provided in the flocculation zone 31 , the aeration zone 32 and the disinfection zone 33 , which can discharge rainwater in sequence and finally discharge the clean water after chemical disinfection to the storage unit 4 .

[0062] A mounting hanger 35 is provided on the top of the flocculation area 31 . A flocculation stirrer 36 is mounted on the mounting hanger 35 . The flocculation stirrer 36 includes a stirring motor 37 and a stirring frame 38 . The stirring motor 37 is connected to the mounting hanger 35 .

[0063] The installation bracket 35 is convenient for providing an installation position for the stirring motor 37. The output end of the stirring motor 37 is fixedly connected to the stirring frame 38, and the stirring motor 37 is installed in the middle of the installation bracket 35. Then, when the stirring motor 37 is powered on, the stirring frame 38 is driven to rotate in a circle, which is convenient for stirring the rainwater. After the flocculant is added to the flocculation area 31, the flocculant and rainwater are mixed through the stirring of the stirring frame 38 to perform flocculation.

[0064] An aeration device 39 is provided in the aeration zone 32. The aeration device 39 includes an aeration pump 394 provided at the top of the aeration zone 32. The aeration pump 394 is connected to an aeration main pipe 391. The aeration main pipe 391 is connected to an aeration branch pipe 392. The aeration branch pipe 392 extends downward relative to the aeration main pipe 391 and, after changing direction, extends horizontally into the bottom of the treatment tank 30.

[0065] A plurality of aeration holes 393 are evenly distributed on the bottom wall of the aeration branch pipe 392. The aeration holes 393 are used to inject air or pure oxygen into the rainwater in the treatment tank 30 for aerobic microbial biochemical treatment, thereby increasing the dissolved oxygen content, providing the necessary conditions for aerobic microbial metabolism, and promoting the efficient decomposition of organic matter (such as COD and ammonia nitrogen), thereby facilitating the purification of rainwater.

[0066] The storage unit 4 includes a clean water storage tank 40. The water pump 34 in the disinfection area 33 is connected to a clean water delivery pipe 41. The clean water delivery pipe 41 is connected to the clean water storage tank 40 and is used to deliver the clean water after the drug addition and purification treatment into the clean water storage tank 40 through the clean water delivery pipe 41 for storage.

[0067] The clean water storage tank 40 is provided with an external water pump 42 and a clean water external transmission pipe 43 connected to the external water pump 42 for externally transmitting the clean water in the clean water storage tank 40 according to actual water demand.

[0068] Based on the water quality monitoring mechanism 44 described above, the water quality monitoring mechanism 44 in the present invention includes an automatic water quality treatment machine. The automatic water quality treatment machine is specifically a device integrating filtering, disinfection and intelligent control functions, and is mainly used for rainwater or sewage purification and treatment, and specifically includes: Self-cleaning filtration intercepts suspended particles through a wedge-shaped filter. When the pressure difference between the inside and outside of the filter reaches a preset value (such as 0.05MPa), the automatic cleaning program is triggered.

[0069] During the cleaning process, the drain valve is opened and the built-in rotating brush or suction scanner removes impurities from the filter. There is no need to interrupt the flow during the whole process, and the flow loss is less than 1%.

[0070] Ultraviolet disinfection uses ultraviolet lamps to irradiate the filtered water, killing more than 99% of bacteria and viruses within 1-2 seconds, leaving no chemical residue and avoiding secondary pollution.

[0071] Intelligent control module, equipped with PLC or touch screen control cabinet, supports dual-mode start-up of cleaning by timing and pressure difference, and monitors water quality parameters (such as turbidity and flow) in real time.

[0072] The clean water storage tank 40 is provided with a float 45 for indicating the water level. The float 45 facilitates observation of the water level inside the clean water storage tank 40 and provides a basis for the water treatment volume of different upstream units.

[0073] When the sponge city rainwater collection and purification system of the present invention is in use, in the initial rainwater stage, the electric push rod is in an extended state, so that the blocking plate 131 blocks the top of the water collection control box 13.

[0074] During the mid-term rain stage, the electric push rod contracts, driving the blocking plate 131 to move, so that the top of the water collection control box 13 is opened to avoid water inlet exposure.

[0075] After the initial filtration of the waterway filter 111 , the rainwater enters the rainwater collection tank 12 along the water collection control box 13 , the water collection branch pipe 14 and the water collection main pipe 15 , and is secondary filtered under the action of the filter box filter 162 .

[0076] The rainwater after secondary filtration falls to the grille bottom plate 161 and falls into the rainwater collection tank 12 for sedimentation. The settled clean water is conveyed by the water guide pump 126 to the downstream plant purification unit 2, and the settled sludge is discharged through the sludge pump 123.

[0077] The rainwater entering the plant purification unit 2 is purified under the ecological purification effect of aquatic plants and / or emergent plants, the mixed matrix 23 and the purification filler 24. The purified rainwater passes through the flocculation zone 31, the aeration zone 32 and the disinfection zone 33 in sequence, which facilitates the flocculation, stirring, aeration and chemical disinfection treatment of the rainwater.

[0078] The biochemically treated rainwater is delivered to the clean water storage tank 40 for storage through the water pump 34 in the disinfection area 33 and the clean water delivery pipe 41 connected to the water pump 34. At the same time, the water quality is detected and treated in real time by the automatic water quality treatment machine.

[0079] The clean water in the clean water storage tank 40 is transported outwards by the external water pump 42 and the clean water external transmission pipeline 43 connected to the external water pump 42 to meet the water demand of downstream.

[0080] The sponge city rainwater collection and purification system in the present invention can improve the existing mid-term rainwater recovery and purification conditions. Through the combination of different treatment units, the water quality of the purified rainwater is guaranteed to meet the needs of long-term storage.

[0081] It should be noted that, unless there is any conflict, the features in the embodiments of this application can be combined with each other.

[0082] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A sponge city rainwater collection and purification system, characterized in that: include: Rainwater collection unit, plant purification unit, biochemical treatment unit and storage unit are arranged in sequence; The rainwater collection unit is used to collect, filter and precipitate mid-term rainwater and pass it into the plant purification unit; The plant purification unit is used to perform ecological conservation and purification treatment through aquatic purification plants, and pass the sewage after ecological conservation and purification treatment into the biochemical treatment unit; The biochemical treatment unit is used to perform deep treatment on rainwater, and performs biochemical treatment of rainwater through flocculation, aeration and disinfection with chemicals; The storage unit is used to store the purified rainwater, continuously monitor the water quality of the stored purified water through a water quality monitoring mechanism, and transport the purified water that meets the water quality requirements to the outside.

2. The sponge city rainwater collection and purification system according to claim 1 is characterized in that: The rainwater collection unit includes a collection channel for receiving mid-term rainwater and distributed on both sides of the urban road, and a rainwater collection tank; A plurality of water collection control boxes are provided below the water collection channel, and a water collection branch pipe is connected to the bottom of each water collection control box. The water collection branch pipes merge and intersect into a water collection main pipe, and the water collection main pipe extends to the upper part of the rainwater collection tank.

3. The sponge city rainwater collection and purification system according to claim 2 is characterized in that: A movably detachable waterway filter is provided at the bottom of the water collection channel, and a horizontally slidable blocking plate is provided on the top of the water collection control box. The blocking plate is provided below the waterway filter and can be pushed and pulled on the water collection control box; The size of the blocking plate is larger than the cross-sectional size of the water collection control box, and the blocking plate can completely block the buckle cover of the water collection control box; The side of the water collection control box is connected with a bracket, and a telescopic mechanism is installed on the bracket. The telescopic rod of the telescopic mechanism is fixedly connected to the blocking plate.

4. The sponge city rainwater collection and purification system according to claim 2 is characterized in that: The rainwater collection tank includes a filter box located at the top, the water collection main pipe extends to the top of the filter box, and the filter box is installed on the water inlet side of the rainwater collection tank through a bracket; The filter box includes a grid bottom plate and a movably detachable filter box filter screen. A plurality of support blocks are provided on the inner side wall of the filter box. The filter box filter screen is overlapped on the middle and upper part of the filter box through the support blocks. The filter screen of the filter box is fitted with a gap between the filter box, and a water drop space of at least a certain height is left between the filter screen of the filter box and the grille bottom plate.

5. The sponge city rainwater collection and purification system according to claim 4 is characterized in that: The rainwater collection tank includes a straight box section and a sediment cone hopper located at the bottom of the straight box section. The filter box is arranged on the top of the straight box section. A sludge pump is installed on the top of the rainwater collection tank. The sludge pump is connected to a sludge inlet pipe and a sludge discharge pipe. The bottom end of the sludge inlet pipe extends into the bottom of the sediment cone hopper. A water guide pump is provided at the top of the rainwater collecting tank on the other side of the filter box. The water guide pump is connected to a water collecting pumping pipe and a water collecting drainage pipe. The bottom end of the water collecting pumping pipe is not lower than the bottom end of the straight box section. The water collecting drainage pipe is used to discharge the mid-term rainwater after collecting and filtering the sediment to the plant purification unit.

6. The sponge city rainwater collection and purification system according to claim 5 is characterized in that: The plant purification unit includes a plant planting frame and a plurality of plant planting boxes mounted on the plant planting frame; Each of the plant planting boxes is filled with a mixed matrix for plant growth, and the plurality of plant planting boxes are arranged flat on top of the plant planting frame with the top surface flush with the ground, and the water collection and drainage pipes extend to the top of the side of the plant planting box; A gap space is left between the bottom wall of the plant planting frame and the bottom wall of the plant planting box for the growth of the roots of aquatic purification plants, and purification fillers are stacked in the gap space. The bottom wall of the plant planting box is provided with plant planting holes for the plant roots to extend downward, and the plant planting frame is connected to a biochemical treatment water inlet pipe.

7. The sponge city rainwater collection and purification system according to claim 1 is characterized in that: The biochemical treatment unit includes a treatment water tank, which includes an open structure at the top and the top surface is flush with the ground; The treatment water tank includes a flocculation zone, an aeration zone and a disinfection zone arranged in sequence, and a water delivery pump is provided in each of the flocculation zone, the aeration zone and the disinfection zone; A mounting hanger is provided on the top of the flocculation zone, a flocculation stirrer is mounted on the mounting hanger, the flocculation stirrer comprises a stirring motor and a stirring frame, and the stirring motor is connected to the mounting hanger.

8. The sponge city rainwater collection and purification system according to claim 7 is characterized in that: An aeration device is provided in the aeration zone, and the aeration device includes an aeration pump provided at the top of the aeration zone, the aeration pump is connected to an aeration main pipe, the aeration main pipe is connected to an aeration branch pipe, and the aeration branch pipe extends into the bottom of the treatment tank; A plurality of aeration holes are evenly distributed on the bottom wall of the aeration branch pipe, and the aeration holes are used to inject air or pure oxygen into the rainwater in the treatment tank for aerobic microbial biochemical treatment; The storage unit includes a clean water storage tank, the water delivery pump in the disinfection area is connected to a clean water delivery pipeline, and the clean water delivery pipeline is connected to the clean water storage tank.

9. The sponge city rainwater collection and purification system according to claim 8 is characterized in that: The clean water storage tank is provided with an external water pump and a clean water external water pipeline connected to the external water pump, for externally transmitting the clean water in the clean water storage tank; The water quality monitoring mechanism includes a water quality treatment machine.

10. The sponge city rainwater collection and purification system according to claim 8, characterized in that: The clean water storage tank is provided with a floating ruler for indicating the water level.

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