Multi-stage utilization rainwater regulation and storage system and multi-stage utilization rainwater regulation and storage method
By optimizing water quality monitoring and liquid level detection in a multi-stage rainwater storage system, the problem of failing to differentiate rainwater quality in existing technologies has been solved, achieving the goals of pollutant reduction and rainwater resource utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-13
- Publication Date
- 2026-04-03
AI Technical Summary
Existing rainwater harvesting and treatment systems fail to differentiate based on rainwater quality, resulting in the direct discharge of untreated pollutants from initial rainwater runoff, increasing water pollution, and failing to effectively utilize low-pollution rainwater from the later stages of the rainy season.
Design a multi-stage rainwater storage system that optimizes the operation of the storage tank through water quality monitoring and liquid level detection, stores rainwater with different pollution levels, and achieves pollutant reduction and reclaimed water reuse by upgrading pump stations and treatment facilities.
It has achieved the goal of minimizing pollutants entering the river and improving the capacity for rainwater resource utilization, obtaining reused rainwater and discharged rainwater according to the rainwater pollution level.
Smart Images
Figure CN121781668A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of rainwater harvesting and treatment technology, specifically, it relates to a multi-stage rainwater utilization and storage system and a multi-stage rainwater utilization and storage method. Background Technology
[0002] Initial runoff refers to surface runoff formed at the beginning of rainfall, typically a 10-15 mm thick layer of precipitation. Because it dissolves pollutants such as acidic gases and vehicle exhaust from the air and washes away surface contaminants, its pollution level is higher than that of ordinary wastewater. Direct discharge of this type of rainwater without treatment will exacerbate water pollution; therefore, it requires interception and treatment systems to reduce pollutants.
[0003] However, current rainwater harvesting and treatment methods typically only involve temporarily storing rainwater in storage tanks and then transporting it to treatment facilities for processing. Once the rainwater meets discharge standards, it is discharged into rivers. This method fails to differentiate rainwater based on its water quality. In reality, during the middle and later stages of the rainy season, the rainwater has a low level of pollution and can be treated for reuse as reclaimed water.
[0004] Therefore, it is necessary to improve the existing rainwater harvesting and treatment system and to differentiate the collection and treatment of rainwater based on its quality. Summary of the Invention
[0005] The present invention discloses a multi-stage rainwater storage system and a multi-stage rainwater storage method. During the operation of the system, the scheduling and operation of the storage tank are optimized according to the idea of "collecting concentrated rainwater and discarding fresh rainwater". By conducting water quality testing on the initial light rainwater interception and evaluating the subsequent operation optimization, the pollutants entering the river are reduced to the maximum extent.
[0006] According to a first aspect of this application, a multi-stage rainwater harvesting and storage system is provided, comprising: Rainwater pipe network; Interception wells are connected to the outlet of the rainwater pipe network; The first gate is connected between the first outlet of the intercepting well and the inlet of the first regulating reservoir; The second gate connects the second outlet of the intercepting well to the river. First regulating reservoir; The first booster pump station is connected to the outlet of the first regulating reservoir; The first treatment facility, connected to the outlet of the first booster pump station, is used to treat rainwater for decontamination. A level gauge is used to monitor the liquid level in a cutoff well. Water quality monitoring devices are used to monitor the water quality in interception wells; The control system is used to control the operation of each gate and to collect data from the water quality monitoring device.
[0007] Optionally, the level gauge can be any one of ultrasonic level gauge, radar level gauge, or laser level gauge.
[0008] Optional, the water quality monitoring device is an online suspended solids detector.
[0009] Optionally, a second storage tank is provided for storing rainwater with a suspended solids concentration ≤ a second concentration threshold. The third gate is connected between the third outlet of the intercepting well and the inlet of the second regulating reservoir; The second booster pump station is connected to the outlet of the second regulating reservoir; The second treatment facility, connected to the outlet of the second booster pump station, is used to treat rainwater to meet reuse standards. Furthermore, the first regulating tank is used to store rainwater with a suspended solids concentration ≥ a first concentration threshold, and the first treatment facility is used to treat the rainwater to meet discharge standards.
[0010] Optionally, the first concentration threshold is 50 mg / L and the second concentration threshold is 20 mg / L.
[0011] According to a second aspect of this application, a multi-stage rainwater harvesting and storage method is provided, which employs the above-described multi-stage rainwater harvesting and storage system and performs the following steps: Step S1: The rainwater pipe network collects rainwater from the initial stage of rainfall in the area and transports it to the interception well; Step S2: The water quality monitoring device monitors the water quality parameters of the rainwater in the interception well and feeds the water quality parameters back to the control system. When the suspended solids concentration is ≥ the first concentration threshold, the control system controls the first gate to open and the second gate to close, so that the rainwater is transported to the first storage tank. When the water quality monitoring device detects that the suspended solids concentration is < the first concentration threshold, the control system controls the first gate to close and the second gate to open, so that the rainwater is discharged into the river. Step S3: After the rainfall ends, the booster pump station transports the rainwater from the first storage tank to the treatment facility. After pollutants are removed and the water meets the discharge standards, it is discharged into the river.
[0012] According to a third aspect of this application, a multi-stage rainwater harvesting and storage method is provided, which employs the above-described multi-stage rainwater harvesting and storage system and performs the following steps: Step S10: The rainwater pipe network collects rainwater from the initial stage of rainfall in the area and transports it to the interception well; Step S20: When the liquid level in the intercepting well is lower than liquid level A, the first gate is opened and the second gate is closed to allow rainwater to enter the first regulating tank. Here, liquid level A is the bottom elevation of the water inlet pipe of the intercepting well. When the liquid level is higher than liquid level A, the first gate is closed and the second gate is opened to allow rainwater to enter the river. In step S30, the first booster pump station transports the rainwater collected in the first storage tank to the treatment facility, where pollutants are removed to meet the standards for reclaimed water reuse, and the water is then delivered to users for reuse.
[0013] According to the fourth aspect of this application, a multi-stage rainwater harvesting and storage method is provided, which employs the above-described multi-stage rainwater harvesting and storage system and performs the following steps: Step S100: The rainwater pipe network collects rainwater from the initial rainfall in the area and transports it to the interception well; Step S200: If the suspended solids concentration detected by the water quality monitoring device is ≥ the first concentration threshold, then the first gate is opened and the third gate and the second gate are closed, allowing rainwater to flow into the first storage tank. If the suspended solids concentration detected by the water quality monitoring device is less than the first concentration threshold but greater than the second concentration threshold, then the first gate and the third gate are closed and the second gate is opened, allowing rainwater to enter the river. If the suspended solids concentration detected by the water quality monitoring device is ≤ the second concentration threshold, then the third gate is opened and the first gate and the second gate are closed, allowing rainwater to enter the second storage tank. When the rainwater level in the intercepting well reaches level A, where level A is the bottom elevation of the inlet pipe of the intercepting well, the first gate and the third gate are closed and the second gate is opened, allowing the collected rainwater to be discharged into the river. In step S300, the second booster pump station lifts the rainwater in the second storage tank to the second treatment facility, where pollutants are removed to meet the standards for reclaimed water reuse, and the water is then transported to users for reuse; the first booster pump station lifts the rainwater in the first storage tank to the first treatment facility, where pollutants are removed to meet the discharge standards, and the water is then discharged into the river.
[0014] This application has the following beneficial effects: (1) This application aims to minimize pollutants entering the river and achieve long-term rainwater resource utilization by conducting water quality testing on rainwater and optimizing system operation.
[0015] (2) This application stores rainwater of different pollution levels in the first and second storage tanks respectively, and can obtain reusable rainwater and discharged rainwater according to the rainwater pollution level, thereby improving the ability of rainwater to be used in a graded manner. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of a multi-stage rainwater storage system according to an embodiment of this application; Figure 2 This is a schematic diagram of the outlet of the intercepting well according to an embodiment of this application; Figure 3 This is another schematic diagram of a multi-stage rainwater storage system according to an embodiment of this application.
[0017] Attached reference numerals: 1. Rainwater pipe network; 2. Interception well; 3. First gate; 4. Second gate; 5. First storage tank; 6. First booster pump station; 7. First treatment facility; 20. Inlet; 21. First outlet; 22. Second outlet; 23. Water quality monitoring device; 24. Level gauge; 31. Third gate; 33. Control system; 33. Level A; 51. Second storage tank; 61. Second booster pump station; 71. Second treatment facility. Detailed Implementation
[0018] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0019] According to one aspect of this application, this embodiment provides a multi-stage rainwater storage and regulation system, including a rainwater pipe network 1 for collecting and transporting rainfall to an intercepting well 2; the intercepting well 2 for collecting and diverting rainwater; a first gate 3 connected between the first outlet 21 of the intercepting well and the inlet of the first storage tank 5 for controlling the opening and closing of the intercepting well 2 and the first storage tank 5; a second gate 4 connected between the second outlet 22 of the intercepting well and a river for controlling the opening and closing of the intercepting well 2 and the river; the first storage tank 5 for temporarily storing rainwater; a first booster pump station 6 for transporting rainwater from the first storage tank 5 to a first treatment facility 7; the first treatment facility 7 for treating the rainwater; a level gauge 24 for monitoring the level in the intercepting well; a water quality monitoring device 23 for monitoring the water quality in the intercepting well; and a control system 33 for controlling the operation of each gate and collecting data from the water quality monitoring device.
[0020] The rainwater pipe network 1 is connected to the inlet 20 of the intercepting well 2. For example, rainwater pipe networks 1 at multiple locations are connected to the inlet of the intercepting well 2, where rainwater flows into the intercepting well 2. The intercepting well 2 collects and distributes the rainwater.
[0021] The intercepting well 2 is equipped with a level gauge 24 and a water quality monitoring device 23. The level gauge 24 can be any one of an ultrasonic level gauge, radar level gauge, or laser level gauge, and the water quality monitoring device 23 can be an online suspended solids detector. The water intake of the first regulating reservoir 5 is mainly controlled by the level and water quality in the intercepting well 2.
[0022] The inflow to the first regulating reservoir can be controlled solely by water quality. A water quality monitoring device 23 monitors the water quality parameters of the rainwater in the intercepting well and feeds these parameters back to the control system 33. The control system controls the opening and closing of the first and second gates based on the water quality parameter values. When the suspended solids concentration in the intercepting well 2 is ≥ a first concentration threshold (e.g., 50 mg / L), the first gate 3 is opened and the second gate 4 is closed, allowing the initial polluted rainwater to enter the first regulating reservoir 5. As rainfall continues, surface pollutants are continuously washed away, and the quality of the collected rainwater continuously improves. When the water quality monitoring device 22 detects that the suspended solids content is < the first concentration threshold, it indicates that the rainfall has washed away most of the surface pollutants, and the water quality is within the river's environmental capacity. In this state, the first gate 3 is closed, and the second gate 4 is opened, allowing the rainwater to flow into the river. The initial rainwater is then transported by the first booster pump station 6 to the first treatment facility 7. After the treatment facility removes pollutants, it meets the river water quality standards before being discharged into the river.
[0023] For areas with good rainwater quality, water quality measurement may not be necessary; instead, the inflow to the first regulating reservoir 5 can be controlled solely by the water level. When the water level in the intercepting well 2 is lower than level A shown in the diagram, the first gate 3 is opened and the second gate 4 is closed, allowing the collected rainwater to enter the first regulating reservoir 5. Level A is the bottom elevation of the inflow pipe of the intercepting well 2. When the water level is higher than level A shown in the diagram, it indicates that the regulating reservoir is full, and the first gate 3 can be closed and the second gate 4 opened, allowing the collected rainwater to enter the river. Then, the first booster pump station transports the rainwater collected in the regulating reservoir 2 to the first treatment facility. The treated reclaimed water is not discharged into the river but meets reuse standards and can be used for urban reclaimed water reuse.
[0024] According to a second aspect of this application, a multi-stage rainwater storage system is provided, which, compared to the aforementioned multi-stage rainwater storage system, includes a second storage tank 51, a second booster pump station 61, and a second treatment facility 71 connected in sequence. A third gate 31 is connected between the second storage tank 51 and the third outlet of the intercepting well 2. The first and second storage tanks can temporarily store rainwater of different qualities. The second storage tank 51 is used to collect rainwater of good quality for treatment and reuse. The first storage tank 51 is used to temporarily store rainwater of poor quality for treatment and discharge into the river.
[0025] Specifically, if the suspended solids concentration detected by the water quality monitoring device 23 is greater than or equal to the first concentration threshold, then the third gate 31 is closed, the first gate 3 is opened, and the second gate 4 is closed, so that rainwater flows into the first regulating tank 5. If the suspended solids concentration of the rainwater stored in the first regulating tank 5 exceeds the standard, it needs to be lifted by the first booster pump station 6 to the first treatment facility 7. After the pollutants are removed by the treatment facility, it meets the water quality standards for discharge into the river and is then discharged into the river.
[0026] If the suspended solids concentration detected by the water quality monitoring device 23 is less than the first concentration threshold but greater than the second concentration threshold (e.g., 20 mg / L), and is similar to the pollution level of the river, then the first gate 3 is closed, the third gate 31 is closed, and the second gate 4 is opened, allowing rainwater to enter the river. If the suspended solids concentration detected by the water quality monitoring device 23 is less than or equal to the second concentration threshold, then the first gate 3 is closed, the third gate 31 is opened, and the second gate 4 is closed, allowing rainwater to enter the second regulating reservoir 51. When the rainwater level in the intercepting well reaches level A (level A is the bottom elevation of the inlet pipe), the regulating reservoir is full of rainwater, and the first gate 3 and the third gate are closed, while the second gate 4 is opened. The rainwater stored in the second regulating reservoir 51 has relatively low pollution levels and can be pumped by the second lift pump station 61 to the second treatment facility 71. After the pollutants are removed by the treatment facility, it meets the standards for reclaimed water reuse and is then transported to users for reuse, realizing the reuse of water resources.
[0027] This application also provides a multi-level rainwater storage method for controlling overflow pollution based on the degree of rainwater system construction and environmental conditions in a certain area. The following three examples illustrate the different methods used under different conditions of rainwater system construction and environmental conditions.
[0028] According to a third aspect of this application, this embodiment provides a multi-stage rainwater storage and regulation method for use in the initial stage of rainwater system construction in a certain area and in situations with low environmental conditions. In this method, water quality parameters detected by a water quality monitoring device 23 control the flow direction of rainwater, directing it into a storage tank or river. The method includes the following steps: Step S1: The rainwater pipe network 1 collects rainwater from the initial rainfall in the area and transports it to the intercepting well 2.
[0029] In the early stages of rainfall, surface runoff begins to form. At this time, the rainwater is contaminated by surface pollutants, which converge into initial polluted rainwater, enters the rainwater pipe network 1, and then enters the interception well 2.
[0030] In step S2, the water quality monitoring device 23 monitors the water quality parameters of the rainwater in the interception well and feeds the water quality parameters back to the control system 33. The control system controls the opening and closing of the first gate and the second gate according to the value of the water quality parameters.
[0031] The water quality parameters include at least the suspended solids concentration. The suspended solids content in the intercepting well 2 is very high. When the suspended solids concentration is ≥ the first concentration threshold, the first gate 3 is opened and the second gate 4 is closed, allowing the initially polluted rainwater to enter the first regulating reservoir 5. As rainfall continues, surface pollutants are continuously washed away, and the quality of the collected rainwater continuously improves. When the water quality monitoring device 22 detects that the suspended solids content is < the first concentration threshold, it indicates that the rainfall has washed away almost all the surface pollutants, and the water quality is within the river's environmental capacity. In this state, the first gate 3 is closed and the second gate 4 is opened, allowing the rainwater to flow into the river.
[0032] Step S3: After the rainfall ends, the initial rainwater is transported from the first booster pump station 6 to the first treatment facility 7. After the pollutants are removed by the treatment facility, the water quality meets the standards for discharge into the river and is then discharged into the river.
[0033] According to the fourth aspect of this application, this embodiment provides a multi-stage rainwater storage method for improving the rainwater system construction and environmental conditions in a certain area. In this method, the flow direction of rainwater is controlled by the liquid level parameters of the interception well, so that the rainwater enters the storage tank or river.
[0034] In step S10, the rainwater pipe network 1 collects rainwater from the initial stage of rainfall in the area and transports it to the intercepting well 2.
[0035] In step S20, the liquid level in intercepting well 2 gradually rises as the rainfall duration increases. When the liquid level is lower than the liquid level A shown in the figure, the first gate 3 is opened and the second gate 4 is closed, allowing the collected rainwater to enter the first regulating reservoir 5. Here, liquid level A is the bottom elevation of the inlet pipe of intercepting well 2. When the liquid level is higher than the liquid level A shown in the figure, it indicates that the regulating reservoir has been filled with rainwater, and the first gate 3 can be closed and the second gate 4 can be opened, allowing the collected rainwater to enter the river.
[0036] In the early stages of rainfall, surface runoff begins to form. However, as the construction of rainwater systems is gradually improved and the environment is gradually enhanced, surface pollutants decrease, the quality of runoff water gradually improves, and the discharged rainwater is only slightly polluted. Rainwater can be stored in storage tanks as much as possible to make full use of the flood peak reduction function of the storage tanks. Furthermore, the stored rainwater can be treated by treatment facilities and reused as reclaimed water or discharged into rivers.
[0037] When the liquid level is higher than level A shown in the diagram, it indicates that the first regulating reservoir is full of water. At this point, the first gate 3 can be closed and the second gate 4 can be opened to allow the rainwater to flow into the river.
[0038] In step S30, the first booster pump station transports the rainwater collected in the first storage tank 5 to the first treatment facility. The reclaimed water obtained after treatment is not discharged into the river, but can meet the reuse standards and can be used for urban reclaimed water reuse.
[0039] According to the fifth aspect of this application, this embodiment provides a multi-stage rainwater storage and regulation method for use in the final stages of rainwater system construction in a certain area and in situations with high environmental pollution levels. This method uses the water quality and level parameters of the intercepting well to jointly control the flow direction of rainwater into a storage tank or river. It includes the following steps: In step S100, the rainwater pipe network 1 collects rainwater from the initial stage of rainfall in the area and transports it to the interception well 2.
[0040] In step S200, if the suspended solids concentration detected by the water quality monitoring device 23 is ≥ the first concentration threshold, then the third gate 31 is closed, the first gate 3 is opened, and the second gate 4 is closed, allowing rainwater to flow into the first regulating reservoir 5. If the suspended solids concentration detected by the water quality monitoring device 23 is less than the first concentration threshold but greater than the second concentration threshold (e.g., 20 mg / L), then the first gate 3 is closed, the third gate 31 is closed, and the second gate 4 is opened, allowing rainwater to enter the river. If the suspended solids concentration detected by the water quality monitoring device 23 is less than or equal to the second concentration threshold, then the first gate 3 is closed, the third gate 31 is opened, and the second gate 4 is closed, allowing rainwater to enter the second regulating reservoir 51. When the rainwater level in the intercepting well reaches the level A shown in the diagram (level A is the bottom elevation of the inlet pipe), the regulating reservoir is full of rainwater. The first gate 3 is closed, the third gate is closed, and the second gate 4 is opened, allowing the collected rainwater to be discharged into the river.
[0041] In step S300, the rainwater stored in the first regulating reservoir 5 has an excessive concentration of suspended solids and needs to be pumped from the first booster pump station 6 to the first treatment facility 7. After the pollutants are removed by the treatment facility, it meets the water quality standards for discharge into the river and is then discharged into the river. The rainwater stored in the second regulating reservoir 51 has less pollution and can be pumped from the second booster pump station 61 to the second treatment facility 71. After the pollutants are removed by the treatment facility, it meets the standards for reclaimed water reuse and is then transported to users for reuse, realizing the reuse of water resources.
[0042] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications are all within the protection scope of the claims of the present invention.
Claims
1. A multi-stage rainwater harvesting and storage system, characterized in that, include: Rainwater pipe network; Interception wells are connected to the outlet of the rainwater pipe network; The first gate is connected between the first outlet of the intercepting well and the inlet of the first regulating reservoir; The second gate connects the second outlet of the intercepting well to the river. First regulating reservoir; The first booster pump station is connected to the outlet of the first regulating reservoir; The first treatment facility, connected to the outlet of the first booster pump station, is used to treat rainwater for decontamination. A level gauge is used to monitor the liquid level in a cutoff well. Water quality monitoring devices are used to monitor the water quality in interception wells; The control system is used to control the operation of each gate and to collect data from the water quality monitoring device.
2. The multi-stage rainwater harvesting and storage system according to claim 1, characterized in that, A level gauge can be any one of the following: ultrasonic level gauge, radar level gauge, or laser level gauge.
3. The multi-stage rainwater harvesting and storage system according to claim 1, characterized in that, The water quality monitoring device is an online suspended solids detector.
4. The multi-stage rainwater harvesting and storage system according to claim 1, characterized in that, Also includes: The second regulating reservoir is used to store rainwater with a suspended solids concentration ≤ the second concentration threshold. The third gate is connected between the third outlet of the intercepting well and the inlet of the second regulating reservoir; The second booster pump station is connected to the outlet of the second regulating reservoir; The second treatment facility, connected to the outlet of the second booster pump station, is used to treat rainwater to meet reuse standards. Furthermore, the first regulating tank is used to store rainwater with a suspended solids concentration ≥ a first concentration threshold, and the first treatment facility is used to treat the rainwater to meet discharge standards.
5. The multi-stage rainwater harvesting and storage system according to claim 4, characterized in that, The first concentration threshold is 50 mg / L, and the second concentration threshold is 20 mg / L.
6. A multi-stage rainwater harvesting and storage method, characterized in that, The multi-stage rainwater harvesting system of claim 1 is used to perform the following steps: Step S1: The rainwater pipe network collects rainwater from the initial stage of rainfall in the area and transports it to the interception well; Step S2: The water quality monitoring device monitors the water quality parameters of the rainwater in the interception well and feeds the water quality parameters back to the control system. When the suspended solids concentration is ≥ the first concentration threshold, the control system controls the first gate to open and the second gate to close, so that the rainwater is transported to the first storage tank. When the water quality monitoring device detects that the suspended solids concentration is < the first concentration threshold, the control system controls the first gate to close and the second gate to open, so that the rainwater is discharged into the river. Step S3: After the rainfall ends, the booster pump station transports the rainwater from the first storage tank to the treatment facility. After pollutants are removed and the water meets the discharge standards, it is discharged into the river.
7. A multi-stage rainwater harvesting and storage method, characterized in that, The multi-stage rainwater harvesting system of claim 1 is used to perform the following steps: Step S10: The rainwater pipe network collects rainwater from the initial stage of rainfall in the area and transports it to the interception well; Step S20: When the liquid level in the intercepting well is lower than liquid level A, the first gate is opened and the second gate is closed to allow rainwater to enter the first regulating tank. Here, liquid level A is the bottom elevation of the water inlet pipe of the intercepting well. When the liquid level is higher than liquid level A, the first gate is closed and the second gate is opened to allow rainwater to enter the river. In step S30, the first booster pump station transports the rainwater collected in the first storage tank to the first treatment facility, where pollutants are removed to meet the standards for reclaimed water reuse, and the water is then delivered to users for reuse.
8. A multi-stage rainwater harvesting and storage method, characterized in that, Using the multi-stage rainwater harvesting system of claim 4, the following steps are performed: Step S100: The rainwater pipe network collects rainwater from the initial rainfall in the area and transports it to the interception well; Step S200: If the suspended solids concentration detected by the water quality monitoring device is ≥ the first concentration threshold, then the first gate is opened and the third gate and the second gate are closed, allowing rainwater to flow into the first storage tank. If the suspended solids concentration detected by the water quality monitoring device is less than the first concentration threshold but greater than the second concentration threshold, then the first gate and the third gate are closed and the second gate is opened, allowing rainwater to enter the river. If the suspended solids concentration detected by the water quality monitoring device is ≤ the second concentration threshold, then the third gate is opened and the first gate and the second gate are closed, allowing rainwater to enter the second storage tank. When the rainwater level in the intercepting well reaches level A, where level A is the bottom elevation of the inlet pipe of the intercepting well, the first gate and the third gate are closed and the second gate is opened, allowing the collected rainwater to be discharged into the river. In step S300, the second booster pump station lifts the rainwater in the second storage tank to the second treatment facility, where pollutants are removed to meet the standards for reclaimed water reuse, and the water is then transported to users for reuse; the first booster pump station lifts the rainwater in the first storage tank to the first treatment facility, where pollutants are removed to meet the discharge standards, and the water is then discharged into the river.