Treatment system and method for urban road runoff rainwater

Abstract

The present invention relates to the field of municipal engineering technology, and in particular to a system and method for treating runoff rainwater on urban roads. The system comprises a treatment box, a rainwater inlet pipe extending through the side wall of the treatment box, a grid slow flow area, a sedimentation area, a filtration area, and a metering tank sequentially arranged in the treatment box, the filtration area being connected to the metering tank via a first water delivery pump assembly, and the metering tank being connected to a pollutant detection tank via a tenth water outlet. The treatment system treats the runoff rainwater, effectively removes or reduces pollutants in the runoff rainwater, and directly discharges the runoff rainwater that meets the treatment standards into the natural water system, while the runoff rainwater that does not meet the standards is discharged into a sewage treatment plant, thereby effectively reducing the flow of the runoff rainwater transported to the sewage treatment plant and improving the quality of the runoff rainwater, significantly reducing the treatment pressure of the sewage treatment plant, and improving the working efficiency of the sewage treatment plant.

Description

Technical Field

[0001] The present invention relates to the technical field of municipal engineering, and in particular to a system and method for treating urban road runoff rainwater. Background Art

[0002] Urban road runoff rainwater is mixed with pollutants such as suspended matter, nutrients, pesticides and petroleum hydrocarbons. The main pollutants are chemical oxygen demand (COD), suspended solids (SS), total phosphorus (TP), total nitrogen (TN) and lead (Pb). Their concentrations are often higher than those in treated sewage and receiving water bodies. If they are allowed to flow directly into water bodies, they will pose a huge challenge to human health and the balance of the ecosystem.

[0003] The existing runoff rainwater treatment process first discharges runoff into a stormwater inlet, where it is then piped to a sewage treatment plant for treatment. Before entering the sewage treatment plant, the runoff is only grated at the inlet. These grates can only intercept larger pollutants, resulting in a high concentration of pollutants in the runoff rainwater entering the sewage treatment plant, placing significant pressure on the plant. Summary of the Invention

[0004] The technical problem solved by the present invention is to provide a system for treating urban road runoff rainwater, which can reduce the treatment pressure of a sewage treatment plant.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a treatment system for urban road runoff rainwater, including a treatment box, a rainwater inlet pipe is provided on the side wall of the treatment box, and a grid slow flow area, a sedimentation area, a filtration area and a metering tank are sequentially provided in the treatment box along the flow direction of the runoff rainwater treatment, the rainwater inlet pipe is connected to the grid slow flow area, the grid slow flow area is connected to the sedimentation area, the sedimentation area is connected to the filtration area, the filtration area is connected to the metering tank through a first water delivery pump assembly, the metering tank is connected to the discharge tank through a second water delivery pump assembly, the metering tank is connected to the pollutant detection tank through a tenth water outlet, and a first electromagnetic switch valve is provided at the tenth water outlet, the pollutant detection tank is connected to the discharge tank through a ninth water outlet, and a second electromagnetic switch valve is provided at the ninth water outlet;

[0006] A first liquid level gauge and a timer are installed on the inner wall of the metering tank, and the first liquid level gauge is electrically connected to the timer. A water quality detection sensor is installed in the pollutant detection tank. A natural water system connecting pipe is provided on the side wall of the pollutant detection tank, and a third electromagnetic switch valve is provided at the water inlet of the natural water system connecting pipe. A sewage treatment plant connecting pipe is provided on the side wall of the discharge tank, and a fourth electromagnetic switch valve is provided at the inlet of the sewage treatment plant connecting pipe.

[0007] The first liquid level meter, the timer, the water quality detection sensor, the first electromagnetic switch valve, the second electromagnetic switch valve, the third electromagnetic switch valve, the fourth electromagnetic switch valve, the first water pump assembly, and the second water pump assembly are all electrically connected to the controller.

[0008] Furthermore, along the direction of runoff rainwater treatment, the grid slow flow area includes a grid pool and a slow flow pool arranged in sequence, a metal grid is installed on the inner wall of the grid pool, and multiple partition plates are installed in sequence on the inner walls on both sides of the slow flow pool. The grid slow flow area is connected to the sedimentation area through the first water outlet.

[0009] Furthermore, along the direction of runoff rainwater treatment, the sedimentation area includes a primary sedimentation tank, a secondary sedimentation tank and a tertiary sedimentation tank arranged in sequence. The grid slow flow area is connected to the primary sedimentation tank through the first water outlet, the primary sedimentation tank is connected to the secondary sedimentation tank through the second water outlet, and the secondary sedimentation tank is connected to the tertiary sedimentation tank through the third water outlet. The first water outlet, the second water outlet and the third water outlet are located on the same plane, and the second water outlet and the third water outlet are relatively staggered in the height direction.

[0010] Furthermore, inclined plates or inclined pipes are installed inside the first-level sedimentation tank, the second-level sedimentation tank and the third-level sedimentation tank respectively. The bottoms of the first-level sedimentation tank, the second-level sedimentation tank and the third-level sedimentation tank are interconnected through mud outlet pipes. The bottom elevations of the first-level sedimentation tank, the second-level sedimentation tank to the third-level sedimentation tank increase successively. The third-level sedimentation tank is connected to the filtration area through the fourth water outlet. The mud outlet pipe is connected to the mud discharge pipe, and the mud discharge pipe is arranged in an inclined manner. A one-way valve and a mud discharge port control valve are provided on the mud discharge pipe, and the mud discharge port control valve is electrically connected to the controller.

[0011] Furthermore, along the direction of runoff rainwater treatment, the filtration area includes a coarse filter tank, an oil absorption filter tank, a fine filter tank and an adsorption filter tank arranged in sequence. The tertiary sedimentation tank is connected to the coarse filter tank through the fourth water outlet, the coarse filter tank is connected to the oil absorption filter tank through the fifth water outlet, the oil absorption filter tank is connected to the fine filter tank through the sixth water outlet, the fine filter tank is connected to the adsorption filter tank through the seventh water outlet, and the adsorption filter tank is connected to the metering tank through the first water pump assembly.

[0012] Furthermore, the coarse filter tank is filled with gravel, the oil absorption filter tank is hung with oil absorption cotton, the fine filter tank is hung with water filter cloth, and the adsorption filter tank is filled with activated carbon.

[0013] Furthermore, a second liquid level gauge is installed on the inner wall of the pollutant detection tank, and the second liquid level gauge is electrically connected to the controller.

[0014] In addition, the technical problem solved by the present invention is to provide a method for treating urban road runoff rainwater that can reduce the treatment pressure of sewage treatment plants.

[0015] The urban road runoff rainwater treatment method using the above-mentioned urban road runoff rainwater treatment system first closes the first electromagnetic switch valve, the second electromagnetic switch valve, the third electromagnetic switch valve, and the fourth electromagnetic switch valve. The runoff rainwater then flows into the rainwater inlet pipe and passes through the grid slow flow area, the sedimentation area, and the filtration area for treatment in sequence. The controller controls the operation of the first water delivery pump assembly to deliver the treated runoff rainwater to the metering tank. The timer starts timing while the first water delivery pump assembly is operating. The timer transmits the obtained time data to the controller, which analyzes and processes the obtained time data.

[0016] When the time it takes for the water flowing into the metering tank to reach the top of the first liquid level gauge is greater than the set time, the controller controls the first electromagnetic switch valve to open, and the runoff rainwater in the metering tank flows into the pollutant detection tank through the tenth water outlet. After reaching the rated capacity of the pollutant detection tank, the controller controls the first electromagnetic switch valve to close, and then the water quality detection sensor detects the water quality of the runoff rainwater in the pollutant detection tank and transmits the detected water quality data to the controller, which analyzes and processes the obtained water quality data. When the runoff rainwater does not meet the direct discharge standard, the controller controls the second electromagnetic switch valve , the fourth electromagnetic switch valve is opened to discharge all the runoff rainwater in the pollutant detection pool into the discharge pool, and then discharged into the sewage treatment plant through the sewage treatment plant connecting pipe. The controller controls the second electromagnetic switch valve to open and controls the first water delivery pump assembly to stop working and the second water delivery pump assembly to work. The second water delivery pump assembly delivers the runoff rainwater in the metering pool to the discharge pool until there is no runoff rainwater in the metering pool. When the runoff rainwater reaches the direct discharge standard, the controller controls the third electromagnetic switch valve to open to discharge all the runoff rainwater in the pollutant detection pool into the natural water system through the natural water system connecting pipe.

[0017] When the time it takes for the water flowing into the metering tank to reach the top of the first liquid level gauge is less than the set time, the second water delivery pump assembly of the controller starts working and the fourth electromagnetic switch valve opens.

[0018] Preferably, the volume of runoff rainwater flowing into the pollutant detection tank is detected by a second liquid level meter, and the detected data is transmitted to the controller.

[0019] The beneficial effects of the present invention are as follows: the system and method for treating urban road runoff rainwater of the present invention treat the runoff rainwater, effectively remove or reduce pollutants in the runoff rainwater, and directly discharge the runoff rainwater that meets the treatment standards into the natural water system, while the runoff rainwater that does not meet the standards is discharged into the sewage treatment plant, thereby effectively reducing the flow of runoff rainwater transported to the sewage treatment plant and improving the quality of the runoff rainwater (reducing the pollutant content), significantly reducing the treatment pressure of the sewage treatment plant, and improving the working efficiency of the sewage treatment plant. In addition, when heavy rain occurs, the runoff rainwater can also be transported to the sewage treatment plant in a timely manner, reducing the possibility of urban waterlogging. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic top view of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the southwest isometric side of the overall structure of the present invention (without some side panels);

[0022] Figure 3 This is an isometric diagram of the overall structure of the present invention (without side panels);

[0023] Marked as: 1. Rainwater inlet pipe; 2. Treatment box; 3. Metal grille; 4. Partition plate; 5. Grille slow flow area; 6. Primary sedimentation tank; 7. Secondary sedimentation tank; 8. Tertiary sedimentation tank; 9. Coarse filter tank; 10. Oil suction filter tank; 11. Fine filter tank; 12. Adsorption filter tank; 13. Metering tank; 14. First liquid level gauge; 15. Pollutant detection tank; 16. Mud discharge pipe; 17. Natural water system connecting pipe; 18. Fourth electromagnetic switch valve; 19. Sewage pipe; 20. First water outlet; 21. Second water outlet; 22. Third water outlet; 23. Fourth water outlet; 24. Fifth water outlet; 25. Sixth water outlet; 26. Seventh water outlet; 27. First water pump assembly; 28. Second water pump assembly; 29. ​​Tenth water outlet; 30. Fourth electromagnetic valve; 31. Ninth water outlet. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1 、 Figure 2 and Figure 3As shown, the urban road runoff rainwater treatment system of the present invention includes a treatment box 2, a rainwater inlet pipe 1 is provided on the side wall of the treatment box 2, and a grid slow flow area 5, a sedimentation area, a filtration area and a metering tank 13 are sequentially provided in the treatment box 2 along the flow direction of the runoff rainwater treatment. The rainwater inlet pipe 1 is connected to the grid slow flow area 5, the grid slow flow area 5 is connected to the sedimentation area, the sedimentation area is connected to the filtration area, the filtration area is connected to the metering tank 13 through a first water delivery pump assembly 27, the metering tank 13 is connected to the discharge tank through a second water delivery pump assembly 28, the metering tank 13 is connected to the pollutant detection tank 15 through a tenth water outlet 29, and a first electromagnetic switch valve is provided at the tenth water outlet 29, the pollutant detection tank 15 is connected to the discharge tank through a ninth water outlet 31, and a second electromagnetic switch valve is provided at the ninth water outlet 31;

[0026] A first liquid level gauge 14 and a timer are installed on the inner wall of the metering tank 13. The first liquid level gauge 14 is electrically connected to the timer. A water quality detection sensor is installed in the pollutant detection tank 15. A natural water system connecting pipe 17 is provided on the side wall of the pollutant detection tank 15, and a third electromagnetic switch valve 30 is provided at the water inlet of the natural water system connecting pipe 17. A sewage treatment plant connecting pipe 19 is provided on the side wall of the discharge tank, and a fourth electromagnetic switch valve 18 is provided at the inlet of the sewage treatment plant connecting pipe 19.

[0027] The first liquid level meter 14, the timer, the water quality detection sensor, the first electromagnetic switch valve, the second electromagnetic switch valve, the third electromagnetic switch valve 30, the fourth electromagnetic switch valve 18, the first water pump assembly 27 and the second water pump assembly 28 are all electrically connected to the controller.

[0028] The processing box 2 is the main installation structure of the entire processing system. In order to facilitate the installation of other components, the processing box 2 is preferably a rectangular shape with an open top, and its material is steel, especially stainless steel.

[0029] The grid slow flow area 5 has two main functions: one is to initially intercept pollutants in the runoff rainwater and block garbage and other waste in the runoff rainwater; the other is to reduce the flow rate of the runoff rainwater. Figure 1 As shown in Figure 2, a preferred structure of the grating slow flow zone 5 of the present invention is as follows: along the direction of the runoff rainwater treatment flow, the grating slow flow zone 5 includes a grating pool and a slow flow pool arranged in sequence. A metal grating 3 is installed on the inner wall of the grating pool, and multiple partition plates 4 are installed in a staggered manner on the inner walls of both sides of the slow flow pool. The grating slow flow zone 5 is connected to the sedimentation zone through a first water inlet 20. The metal grating 3 is arranged perpendicular to the runoff rainwater treatment flow direction to intercept larger garbage and other waste in the runoff rainwater. The multiple partition plates 4 cause the runoff rainwater to flow in an S-shape, effectively reducing the flow rate of the runoff rainwater.

[0030] The function of the sedimentation zone is to remove COD and suspended particles in the runoff rainwater by sedimentation. In order to ensure the treatment effect of the sedimentation zone, a preferred structure of the sedimentation zone of the present invention is: along the flow direction of the runoff rainwater treatment, the sedimentation zone includes a primary sedimentation tank 6, a secondary sedimentation tank 7 and a tertiary sedimentation tank 8 arranged in sequence, the grid slow flow zone 5 is connected to the primary sedimentation tank 6 through the first water outlet 20, the primary sedimentation tank 6 is connected to the secondary sedimentation tank 7 through the second water outlet 21, and the secondary sedimentation tank 7 is connected to the tertiary sedimentation tank 8 through the third water outlet 22. The first water outlet 20, the second water outlet 21 and the third water outlet 22 are located on the same plane, and the second water outlet 21 and the third water outlet 22 are relatively staggered in the height direction, so that the sedimentation zone can better remove COD and suspended particles in the runoff rainwater.

[0031] The COD and suspended particulate matter in the runoff rainwater are precipitated to produce sludge. In order to more conveniently discharge the sludge, inclined plates or inclined pipes are installed inside the primary sedimentation tank 6, the secondary sedimentation tank 7 and the tertiary sedimentation tank 8. Inclined plates are preferably used. The service life of the inclined plates is long and there is no need to replace them for a long time. The bottoms of the primary sedimentation tank 6, the secondary sedimentation tank 7 and the tertiary sedimentation tank 8 are interconnected through a mud discharge pipe. The bottom elevations of the primary sedimentation tank 6, the secondary sedimentation tank 7 to the tertiary sedimentation tank 8 are successively increased, so that the sludge in the tertiary sedimentation tank and the secondary sedimentation tank can flow into the primary sedimentation tank through the mud discharge pipe and be discharged through the mud discharge pipe. The tertiary sedimentation tank 8 is connected to the filtration area through the fourth water outlet 23, and the mud discharge pipe is connected to the mud discharge pipe 16, and the mud discharge pipe 16 is arranged in an inclined manner, which is convenient for gravity mud discharge and does not require an external power source for mud discharge, which is beneficial to energy saving. A one-way valve and a mud discharge port control valve are provided on the mud discharge pipe 16, and the mud discharge port control valve is electrically connected to the controller.

[0032] The function of the filter area is to further filter the runoff rainwater so that the runoff rainwater can reach the direct discharge standard. In order to ensure the filtering effect of the filter area, a preferred structure of the filter area of ​​the present invention is: Figure 1 、 Figure 2 、 Figure 3As shown, along the direction of runoff rainwater treatment, the filtration area includes a coarse filter 9, an oil absorption filter 10, a fine filter 11, and an adsorption filter 12, which are arranged in sequence. The tertiary sedimentation tank 8 is connected to the coarse filter 9 via the fourth water inlet 23, the coarse filter 9 is connected to the oil absorption filter 10 via the fifth water inlet 24, the oil absorption filter 10 is connected to the fine filter 11 via the sixth water inlet 25, the fine filter 11 is connected to the adsorption filter 12 via the seventh water inlet 26, and the adsorption filter 12 is connected to the metering tank 13 via the first water pump assembly 27. The coarse filter 9 is filled with gravel to effectively filter floating matter in the runoff. The oil absorption filter 10 is hung with oil-absorbing cotton to remove petroleum hydrocarbon pollutants in the runoff. The fine filter 11 is hung with filter cloth to further filter suspended matter in the runoff. The adsorption filter 12 is filled with activated carbon to adsorb organic matter, metal ions, microorganisms, and odors in the runoff. The positions of the fourth water outlet 23, the fifth water outlet 24, and the sixth water outlet 25 are relatively staggered, which can extend the flow route of the runoff in the coarse filter tank, the oil absorption filter tank and the fine filter tank, and facilitate better filtration operations in the filtration area. The height of the eighth water outlet 27 is higher than that of the seventh water outlet 26, which increases the space for the runoff rainwater to stay in the adsorption filter tank and extends the time that the runoff rainwater stays in the adsorption filter tank.

[0033] In order to detect the volume of runoff rainwater flowing into the pollutant detection tank 15 and transmit the detected data to the controller, a second liquid level gauge is installed on the inner wall of the pollutant detection tank 15, and the second liquid level gauge is electrically connected to the controller.

[0034] The urban road runoff rainwater treatment method using the above-mentioned urban road runoff rainwater treatment system first closes the first electromagnetic switch valve, the second electromagnetic switch valve, the third electromagnetic switch valve 30, and the fourth electromagnetic switch valve 18 through a controller. Then, the runoff rainwater flows into the rainwater inlet pipe 1 and passes through the grid slow flow area 5, the sedimentation area, and the filtration area for treatment in sequence. Then, the controller controls the first water delivery pump assembly 27 to operate and deliver the treated runoff rainwater to the metering tank 13. When the first water delivery pump assembly 27 operates, a timer starts timing, and the timer transmits the obtained time data to the controller, which analyzes and processes the obtained time data.

[0035] When the time it takes for the water flowing into the metering tank 13 to reach the top of the first liquid level meter 14 is greater than the set time, it means that the flow rate of the runoff rainwater is normal, and the controller controls the first electromagnetic switch valve to open, and the runoff rainwater in the metering tank 13 flows into the pollutant detection tank 15 through the tenth water outlet 29. After reaching the rated capacity of the pollutant detection tank 15, the controller controls the first electromagnetic switch valve to close, and then the water quality detection sensor detects the water quality of the runoff rainwater in the pollutant detection tank 15, and transmits the detected water quality data to the controller. The controller analyzes and processes the obtained water quality data. When the runoff rainwater does not meet the direct discharge standard, the controller controls the second electromagnetic switch valve and the fourth electromagnetic switch valve 18 to open. , all the runoff rainwater in the pollutant detection tank 15 at this time is discharged into the discharge tank, and then discharged into the sewage treatment plant through the sewage treatment plant connecting pipe 19. The controller controls the second electromagnetic switch valve to open and controls the first water pump assembly 27 to stop working and the second water pump assembly 28 to work. The second water pump assembly 28 transfers the runoff rainwater in the metering tank 13 at this time to the discharge tank until there is no runoff rainwater in the metering tank 13. The controller then controls the second water pump assembly 28 to stop working and the first water pump assembly 27 to work again. When the runoff rainwater reaches the direct discharge standard, the controller controls the third electromagnetic switch valve 30 to open, and all the runoff rainwater in the pollutant detection tank 1 at this time is discharged into the natural water system through the natural water system connecting pipe 17;

[0036] When the time it takes for the water flowing into the metering tank 13 to reach the top of the first liquid level gauge 14 is less than the set time, it means that the runoff rainwater flow is too large and there is a heavy rain. The controller's second water pump assembly 28 starts working and the fourth electromagnetic switch valve 18 opens. The second water pump assembly 28 transports the runoff rainwater in the metering tank 13 to the discharge tank and discharges it into the sewage treatment plant through the sewage treatment plant connecting pipe 19. The runoff rainwater can be transported to the sewage treatment plant in time, reducing the possibility of urban waterlogging.

[0037] The runoff rainwater is processed in sequence through the grille slow flow area 5, the sedimentation area, and the filtration area, so that the runoff rainwater can meet the direct discharge standard. Specifically: the grille slow flow area 5 preliminarily intercepts pollutants in the runoff rainwater, blocks garbage and other waste in the runoff rainwater and reduces the water flow rate of the runoff rainwater; the sedimentation area removes COD and suspended particles in the runoff rainwater through multi-stage sedimentation; the filtration area further filters the runoff rainwater, the coarse filter 9 is filled with gravel, which can effectively filter floating objects in the runoff, the oil absorption filter 10 is hung with oil-absorbing cotton to remove petroleum hydrocarbon pollutants in the runoff, the fine filter 11 is hung with water filter cloth to further filter the suspended matter in the runoff, and the adsorption filter 12 is filled with activated carbon to adsorb organic matter, metal ions, microbial cells and odors in the runoff.

[0038] In order to obtain accurate and timely runoff rainwater capacity flowing into the pollutant detection tank 15 , the runoff rainwater capacity flowing into the pollutant detection tank 15 is detected by a second liquid level meter, and the detected data is transmitted to the controller.

[0039] In summary, the system and method for treating urban road runoff rainwater of the present invention treats runoff rainwater, effectively removes or reduces pollutants in the runoff rainwater, and directly discharges runoff rainwater that meets treatment standards into natural water systems, while runoff rainwater that does not meet treatment standards is discharged into sewage treatment plants. This effectively reduces the flow of runoff rainwater delivered to sewage treatment plants and improves the quality of runoff rainwater (reducing pollutant content), significantly reducing the processing pressure of sewage treatment plants and improving the working efficiency of sewage treatment plants. Furthermore, when heavy rain occurs, runoff rainwater can also be delivered to sewage treatment plants in a timely manner, reducing the possibility of urban waterlogging.

Claims

1. Urban road runoff rainwater treatment system, characterized by: The invention comprises a treatment box (2), a rainwater inlet pipe (1) is provided on the side wall of the treatment box (2), and a grid slow flow area (5), a sedimentation area, a filter area and a metering pool (13) are sequentially provided in the treatment box (2) along the direction of the runoff rainwater treatment flow. The rainwater inlet pipe (1) is connected to the grid slow flow area (5), the grid slow flow area (5) is connected to the sedimentation area, the sedimentation area is connected to the filter area, the filter area is connected to the metering pool (13) through a first water delivery pump assembly (27), the metering pool (13) is connected to the discharge pool through a second water delivery pump assembly (28), the metering pool (13) is connected to the pollutant detection pool (15) through a tenth water outlet (29), and a first electromagnetic switch valve is provided at the tenth water outlet (29), the pollutant detection pool (15) is connected to the discharge pool through a ninth water outlet (31), and a second electromagnetic switch valve is provided at the ninth water outlet (31); A first liquid level gauge (14) and a timer are installed on the inner wall of the metering tank (13), and the first liquid level gauge (14) is electrically connected to the timer. A water quality detection sensor is installed in the pollutant detection tank (15). A through-flowing natural water system connecting pipe (17) is provided on the side wall of the pollutant detection tank (15), and a third electromagnetic switch valve (30) is provided at the water inlet of the natural water system connecting pipe (17). A through-flowing sewage treatment plant connecting pipe (19) is provided on the side wall of the discharge tank, and a fourth electromagnetic switch valve (18) is provided at the inlet of the sewage treatment plant connecting pipe (19). The first liquid level meter (14), the timer, the water quality detection sensor, the first electromagnetic switch valve, the second electromagnetic switch valve, the third electromagnetic switch valve (30), the fourth electromagnetic switch valve (18), the first water delivery pump assembly (27) and the second water delivery pump assembly (28) are all electrically connected to the controller.

2. The urban road runoff rainwater treatment system according to claim 1, characterized in that: Along the flow direction of the runoff rainwater treatment, the grid slow flow area (5) includes a grid pool and a slow flow pool arranged in sequence, a metal grid (3) is installed on the inner wall of the grid pool, and a plurality of partition plates (4) are staggeredly installed on the inner walls of both sides of the slow flow pool in sequence, and the grid slow flow area (5) is connected to the sedimentation area through the first water outlet (20).

3. The urban road runoff rainwater treatment system according to claim 1, characterized in that: Along the flow direction of runoff rainwater treatment, the sedimentation area includes a primary sedimentation tank (6), a secondary sedimentation tank (7) and a tertiary sedimentation tank (8) arranged in sequence. The grid slow flow area (5) is connected to the primary sedimentation tank (6) through the first water outlet (20), the primary sedimentation tank (6) is connected to the secondary sedimentation tank (7) through the second water outlet (21), and the secondary sedimentation tank (7) is connected to the tertiary sedimentation tank (8) through the third water outlet (22). The first water outlet (20), the second water outlet (21) and the third water outlet (22) are located on the same plane, and the second water outlet (21) and the third water outlet (22) are relatively staggered in the height direction.

4. The urban road runoff rainwater treatment system according to claim 3, characterized in that: Inclined plates or inclined pipes are installed inside the primary sedimentation tank (6), the secondary sedimentation tank (7) and the tertiary sedimentation tank (8), respectively. The bottoms of the primary sedimentation tank (6), the secondary sedimentation tank (7) and the tertiary sedimentation tank (8) are interconnected through mud outlet pipes. The bottom elevations of the primary sedimentation tank (6), the secondary sedimentation tank (7) to the tertiary sedimentation tank (8) are successively increased. The tertiary sedimentation tank (8) is connected to the filtration area through the fourth water outlet (23). The mud outlet pipe is connected to the mud discharge pipe (16), and the mud discharge pipe (16) is arranged in an inclined manner. A one-way valve and a mud discharge port control valve are provided on the mud discharge pipe (16), and the mud discharge port control valve is electrically connected to the controller.

5. The urban road runoff rainwater treatment system according to claim 1, characterized in that: Along the flow direction of runoff rainwater treatment, the filtration area includes a coarse filter tank (9), an oil absorption filter tank (10), a fine filter tank (11) and an adsorption filter tank (12) arranged in sequence. The tertiary sedimentation tank (8) is connected to the coarse filter tank (9) through the fourth water outlet (23), the coarse filter tank (9) is connected to the oil absorption filter tank (10) through the fifth water outlet (24), the oil absorption filter tank (10) is connected to the fine filter tank (11) through the sixth water outlet (25), the fine filter tank (11) is connected to the adsorption filter tank (12) through the seventh water outlet (26), and the adsorption filter tank (12) is connected to the metering tank (13) through the first water delivery pump assembly (27).

6. The urban road runoff rainwater treatment system according to claim 1, characterized in that: The coarse filter (9) is filled with gravel, the oil absorption filter (10) is hung with oil absorption cotton, the fine filter (11) is hung with water filter cloth, and the adsorption filter (12) is filled with activated carbon.

7. The urban road runoff rainwater treatment system according to claim 1, characterized in that: A second liquid level gauge is installed on the inner wall of the pollutant detection tank (15), and the second liquid level gauge is electrically connected to the controller.

8. A method for treating urban road runoff rainwater using the urban road runoff rainwater treatment system according to any one of claims 1 to 7, characterized in that: First, the first electromagnetic switch valve, the second electromagnetic switch valve, the third electromagnetic switch valve (30) and the fourth electromagnetic switch valve (18) are all in a closed state, and then the runoff rainwater flows in through the rainwater inlet pipe (1), and is processed in sequence through the grid slow flow area (5), the sedimentation area, and the filtration area. Then, the controller controls the first water delivery pump assembly (27) to work, and delivers the processed runoff rainwater to the metering tank (13). When the first water delivery pump assembly (27) works, the timer starts timing, and the timer transmits the obtained time data to the controller, and the controller analyzes and processes the obtained time data. When the time for the water flowing into the metering tank (13) to reach the top of the first liquid level gauge (14) is greater than the set time, the controller controls the first electromagnetic switch valve to open, and the runoff rainwater in the metering tank (13) flows into the pollutant detection tank (15) through the tenth water outlet (29). After reaching the rated capacity of the pollutant detection tank (15), the controller controls the first electromagnetic switch valve to close, and then the water quality detection sensor detects the water quality of the runoff rainwater in the pollutant detection tank (15) and transmits the detected water quality data to the controller. The controller analyzes and processes the obtained water quality data. When the runoff rainwater does not meet the direct discharge standard, the controller controls the second electromagnetic switch valve and the fourth electromagnetic switch valve. The door (18) is opened, and all the runoff rainwater in the pollutant detection pool (15) is discharged into the discharge pool, and then discharged into the sewage treatment plant through the sewage treatment plant connecting pipe (19). The controller controls the second electromagnetic switch valve to open and controls the first water delivery pump assembly (27) to stop working and the second water delivery pump assembly (28) to work. The second water delivery pump assembly (28) delivers the runoff rainwater in the metering pool (13) to the discharge pool until there is no runoff rainwater in the metering pool (13); when the runoff rainwater reaches the direct discharge standard, the controller controls the third electromagnetic switch valve (30) to open, and all the runoff rainwater in the pollutant detection pool (15) is discharged into the natural water system through the natural water system connecting pipe (17); When the time for the water flowing into the metering tank (13) to reach the top of the first liquid level gauge (14) is less than the set time, the controller controls the second water delivery pump assembly (28) to operate and the fourth electromagnetic switch valve (18) to open, and the second water delivery pump assembly (28) delivers the runoff rainwater in the metering tank (13) to the discharge tank, and discharges it into the sewage treatment plant through the sewage treatment plant connecting pipe (19).

9. The method for treating urban road runoff rainwater according to claim 8, characterized in that: The runoff rainwater capacity flowing into the pollutant detection tank (15) is detected by a second liquid level meter, and the detected data is transmitted to the controller.

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