Runoff treatment system for highway pavement or bridge floor

Abstract

The utility model discloses a highway pavement runoff collection and treatment system which is characterized by comprising an accident wastewater temporary storage pool, a plurality of initial rainwater treatment pools and a pipeline control device, the pipeline control device comprises a water inlet pipeline, a sludge discharge pipeline, an oil discharge pipeline, a water discharge pipeline and an electromagnetic valve remote controller. The highway pavement runoff collection and treatment system can effectively treat initial rainwater on the pavement and temporarily store wastewater in an accident state, realizes continuous and batch treatment of the initial rainwater, has strong adaptability to collection and treatment of the initial rainwater under different rainfall conditions, and has good precipitation and oil separation functions; the functions of collection and treatment of initial rainwater and temporary storage of accident wastewater are separated, so that the environmental safety coefficient is improved; the whole process is automatically controlled, manual operation is not needed, and the method has wide application prospects in expressway construction projects.

Description

Technical Field

[0001] The utility model relates to the runoff treatment of road surfaces or bridge decks, and particularly to a runoff treatment system for highway road surfaces or bridge decks. Background Technique

[0002] Highway route selection should avoid environmental sensitive areas such as drinking water source protection areas and nature reserves as much as possible, which can prevent toxic and harmful substances leaked due to traffic accidents of hazardous chemical vehicles from flowing into the water bodies of sensitive areas along with road surface runoff, threatening the safety of people and aquatic organisms. On the other hand, road surface runoff, especially the initial rainwater, contains water pollutants such as SS, COD, and heavy metals. If directly discharged into sensitive water bodies without treatment, it will affect water quality. Since highway route selection also needs to comprehensively consider factors such as terrain, geology, engineering technical indicators, and economy, there are inevitable situations of crossing environmental sensitive areas. Therefore, the treatment of initial road surface rainwater and the temporary storage of waste liquid in accident states, as an important environmental protection facility, its water pollution prevention function is particularly important.

[0003] After investigation, for highways crossing environmental sensitive areas in China, initial rainwater sedimentation ponds are provided in corresponding sections, which also serve as temporary storage ponds for toxic and harmful waste liquid in accident states. Its water inlet is directly connected to the highway drainage ditch through pipelines and ditches, and a valve is installed at the water outlet, which is kept closed on rainy days and manually opened on sunny days to release the stored rainwater, and then closed. Its operation mode continuously increases labor costs, and due to the certain lag of manual operation, if it continues to rain and the pool is full and not emptied in time, and if hazardous chemicals leak subsequently, the accident wastewater cannot be effectively stored temporarily and will overflow from the accident pool, which is very likely to cause environmental risk accidents and threaten water body safety. On the other hand, the water pollutants in the initial rainwater are mainly non-dissolved COD, and other water pollutants such as SS and heavy metals have smaller particle sizes and are extremely difficult to settle. Therefore, the sedimentation pond only plays a role in sedimenting large-particle-size sediment, and its effluent is difficult to meet the water quality requirements for discharging into sensitive water bodies. Content of the Utility Model

[0004] To solve the above problems, the utility model provides a runoff treatment system for highway road surfaces or bridge decks.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A runoff treatment system for highway road surfaces or bridge decks, the runoff treatment system for highway road surfaces or bridge decks includes a diversion pool, an accident pool, a coagulation reaction pool, an inclined tube sedimentation pond, and a natural sedimentation pond;

[0007] The diversion tank is connected to the drainage channels of the highway pavement or bridge deck through pipelines, and is respectively connected to the accident tank and the coagulation reaction tank through pipelines; a liquid level gauge is installed in the accident tank; a baffle plate and a liquid level gauge are installed in the coagulation reaction tank, and water distribution holes communicating with the inclined tube sedimentation tank are provided at the bottom of the tank body; inclined tubes are installed in the inclined tube sedimentation tank, and the clarification area of the inclined tube sedimentation tank is connected to the natural sedimentation tank through a sedimentation connecting pipe; a turbidity detector, a flexible weir, and a first drain pipe connected to the flexible weir are installed in the natural sedimentation tank.

[0008] The runoff treatment system for the highway pavement or bridge deck further includes on-off flow control components installed on the pipelines between the diversion tank and the accident tank, on the pipelines between the diversion tank and the coagulation reaction tank, at the water distribution holes, and on the sedimentation connecting pipe.

[0009] Further, the on-off flow control components include an electric valve installed on the pipeline between the diversion tank and the accident tank, an electric valve, a flow meter, and a flow limiting valve installed on the pipeline between the diversion tank and the coagulation reaction tank, a one-way valve installed at the water distribution holes, and a one-way valve installed on the sedimentation connecting pipe.

[0010] Further, the diversion tank is provided with an overflow port, and a turbidity detector is installed in the tank.

[0011] Further, the inclined tube sedimentation tank is provided with a second drain pipe and a third drain pipe, and electric valves are installed on both the second drain pipe and the third drain pipe.

[0012] Further, an oil collecting pipe and a water collecting pipe are installed in the natural sedimentation tank, an oil drain pipe communicating with the oil collecting pipe is installed outside the natural sedimentation tank, and the water collecting pipe is connected to the flexible weir in the natural sedimentation tank; electric valves are installed on both the oil drain pipe and the first drain pipe.

[0013] Further, the runoff treatment system for the highway pavement or bridge deck further includes a chemical dosing device, and the chemical dosing device includes a chemical dissolution tank, a chemical dosing machine capable of dosing into the chemical dissolution tank, and a stirrer installed in the chemical dissolution tank; the chemical dissolution tank is connected to the first drain pipe outside the natural sedimentation tank through a pipeline, and is connected to a pipeline mixer through a pipeline, and the pipeline mixer is installed on the pipeline between the diversion tank and the coagulation reaction tank.

[0014] Further, a liquid level gauge is installed in the chemical dissolution tank; a metering pump is installed on the pipeline connecting the chemical dissolution tank and the pipeline mixer; a solenoid valve is installed on the pipeline connecting the chemical dissolution tank and the first drain pipe outside the natural sedimentation tank.

[0015] Further, a first sludge discharge pipe is installed at the bottom of the coagulation reaction tank and the natural sedimentation tank, and a first sludge discharge solenoid valve is installed on the first sludge discharge pipe; a second sludge discharge pipe is installed at the bottom of the inclined tube sedimentation tank, and a second sludge discharge solenoid valve is installed on the second sludge discharge pipe.

[0016] The beneficial effects of the present utility model are as follows:

[0017] The runoff treatment system for the highway pavement or bridge deck is characterized in that it realizes the collaborative treatment of road (bridge) surface runoff by a natural sedimentation tank and an inclined tube sedimentation tank, and adopts different treatment processes according to different inflow volumes, realizing the continuous treatment of batch and variable road (bridge) surface runoff.

[0018] It can not only treat the initial rainwater, but also treat the subsequent road (bridge) surface runoff to the greatest extent. The accident state discrimination is based on the signals of the local hazardous chemical monitoring platform, with timely and accurate response, which can reduce the sudden environmental risks. The runoff treatment system for the highway pavement or bridge deck can be combined with automatic control and has good application prospects. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structural layout of the runoff treatment system for the highway pavement or bridge deck of the present utility model;

[0020] Figure 2 For the present utility model Figure 1 A cross-sectional view taken at A-A in;

[0021] Figure 3 For the present utility model Figure 1 A cross-sectional view taken at B-B in;

[0022] Figure 1 —In Fig. 3, 1—diversion tank, 2—accident tank, 3—coagulation reaction tank, 4—inclined tube sedimentation tank, 5—natural sedimentation tank, 6—liquid level gauge, 7—baffle plate, 8—liquid level gauge, 9—water distribution hole, 10—inclined tube, 11—sedimentation connecting pipe, 12—turbidity detector, 13—flexible decanting device, 14—first drain pipe, 15—electric valve, 16—electric valve, 17—flow meter, 18—flow limiting valve, 19—one-way valve, 20—one-way valve, 21—overflow port, 22—turbidity detector, 23—second drain pipe, 24—third drain pipe, 25—electric valve, 26—electric valve, 27—oil collecting pipe, 28—water collecting pipe, 29—oil drain pipe, 30—electric valve, 31—electric valve, 32—drug dissolving tank, 33—drug adding machine, 34—stirrer, 35—pipeline mixer, 36—liquid level gauge, 37—metering pump, 38—solenoid valve, 39—first sludge discharge pipe, 40—first sludge discharge solenoid valve, 41—second sludge discharge pipe, 42—second sludge discharge solenoid valve. Detailed Embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right", etc. can be used here to describe the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that in addition to the orientations shown in the figure, the spatial terms are intended to include different orientations during the use or operation of the device. For example, if the device in the figure is inverted, the element described as being "below" other elements or features will be located "above" other elements or features. Therefore, the exemplary term "lower" can include both upper and lower orientations. The device can be positioned in other ways, and the spatial relative descriptions used here can be interpreted accordingly. Embodiment 1

[0025] This embodiment provides a runoff treatment system for highway pavements or bridge decks, as Figure 1 shown. The runoff treatment system for highway pavements or bridge decks includes a diversion pool 1, an accident pool 2, a coagulation reaction pool 3, an inclined tube sedimentation tank 4, and a natural sedimentation tank 5. Among them, the diversion pool 1 is connected to the drainage ditch of the highway pavement or bridge deck through a pipeline, and at the same time, the diversion pool 1 is respectively connected to the accident pool 2 and the coagulation reaction pool 3 through pipelines. A liquid level gauge 6 is installed in the accident pool 2; a baffle plate 7 and a liquid level gauge 8 are installed in the coagulation reaction pool 3. As Figure 2 shown, a water distribution hole 9 communicating with the inclined tube sedimentation tank 4 is provided at the bottom of its pool body; inclined tubes 10 are installed in the inclined tube sedimentation tank 4. As Figure 3 shown, the clarification area of the inclined tube sedimentation tank 4 is connected to the natural sedimentation tank 5 through a sedimentation connecting pipe 11; a turbidity detector 12, a flexible weir 13, and a first drain pipe 14 connected to the flexible weir 13 are installed in the natural sedimentation tank 5, and an electric valve 31 is installed on the first drain pipe 14.

[0026] The runoff treatment system for highway pavements or bridge decks further includes on-off flow control components installed on the pipelines between the diversion pool 1 and the accident pool 2, on the pipelines between the diversion pool 1 and the coagulation reaction pool 3, at the water distribution hole 9, and on the sedimentation connecting pipe 11. As Figure 1 shown, the on-off flow control components include an electric valve 15 installed on the pipeline between the diversion pool 1 and the accident pool 2, an electric valve 16, a flow meter 17, a flow limiting valve 18 installed on the pipeline between the diversion pool 1 and the coagulation reaction pool 3, a check valve 19 installed at the water distribution hole 9, and a check valve 20 installed on the sedimentation connecting pipe 11.

[0027] The runoff treatment system for the highway pavement or bridge deck mainly has the following functions:

[0028] Function 1:

[0029] When a traffic accident occurs to a hazardous chemical vehicle on the road section, the background control personnel remotely control the electric valve 16 on the pipeline between the diversion tank 1 and the coagulation reaction tank 3 to close, and at the same time open the electric valve 15 on the pipeline between the diversion tank 1 and the accident tank 2; the liquid toxic and harmful substances and fire-fighting wastewater leaked from the road surface or bridge deck enter the diversion tank 1 through the drainage ditch and pipeline of the highway pavement or bridge deck, and then enter the accident tank 2 through the pipeline between the diversion tank 1 and the accident tank 2. The liquid level gauge 6 installed in the accident tank 2 can remind the platform control system of the liquid level height in the tank at any time.

[0030] Further, as a preferred technical solution of this embodiment, as Figure 1 shown, the inclined tube sedimentation tank 4 in this embodiment is also provided with a second drain pipe 23 and a third drain pipe 24, and an electric valve 25 is installed on the second drain pipe 23, and electric valves 26 are installed on the third drain pipe 24. When the liquid toxic and harmful substances and fire-fighting wastewater are excessive, the liquid level gauge 6 detects that the accident tank 2 is about to be filled; at this time, the background control personnel can remotely control the electric valves 25 and 26 on the second drain pipe 23 and / or the third drain pipe 24 to open, so that the water in the inclined tube sedimentation tank 4 is discharged; at the same time, the electric valve 16 on the pipeline between the diversion tank 1 and the coagulation reaction tank 3 can be remotely controlled to open, and the electric valves 25 and 26 on the second drain pipe 23 and the third drain pipe 24 are closed, so that the liquid toxic and harmful substances and fire-fighting wastewater can enter the coagulation reaction tank 3 and the inclined tube sedimentation tank 4, enabling the entire system to store more waste liquid. In addition, a turbidity detector 22 is installed in the diversion tank 1 for detecting the turbidity of the water body.

[0031] Function 2:

[0032] In the non-accident state, the electric valve 15 on the pipeline between the diversion tank 1 and the accident tank 2 is in the normally closed state, and the electric valve 16 on the pipeline between the diversion tank 1 and the coagulation reaction tank 3 is in the normally open state. Rainwater enters the diversion tank 1 through the drainage ditches and pipelines on the road surface or bridge deck, and then enters the coagulation reaction tank 3 through the pipeline between the diversion tank 1 and the coagulation reaction tank 3. By adding reagents into the coagulation reaction tank 3, the rainwater and the reagents carry out a coagulation reaction. The flow direction can be changed by the baffle plate 7 to increase the flow path, making the coagulation reaction more sufficient. At the same time, the flowmeter 17 on the pipeline between the diversion tank 1 and the coagulation reaction tank 3 and the liquid level gauge 8 in the coagulation reaction tank 3 are used to monitor the rainwater flow and the liquid level in the coagulation reaction tank 3 in real time. Under normal circumstances, it is necessary to ensure that the rainwater flow is less than the treatment capacity of the inclined tube sedimentation tank 4; when the rainwater flow is greater than the treatment capacity of the inclined tube sedimentation tank 4, the background control personnel remotely control the opening of the flow limiting valve 18 on the pipeline between the diversion tank 1 and the coagulation reaction tank 3 for flow limiting. After the liquid in the coagulation reaction tank 3 undergoes a coagulation reaction, it enters the inclined tube sedimentation tank 4 through the one-way valve 19 at the water distribution hole 9 for preliminary sedimentation. The inclined tubes 10 in the inclined tube sedimentation tank 4 can improve the sedimentation efficiency. The liquid after preliminary sedimentation enters the natural sedimentation tank 5 through the one-way valve 20 on the sedimentation connecting pipe 11 for secondary sedimentation.

[0033] Further, as a preferred technical solution of this embodiment, as Figure 1 shown, a turbidity detector 12 is also installed in the natural sedimentation tank 5 of this embodiment. By installing the turbidity detector 12, the water quality in the natural sedimentation tank 5 can be monitored in real time. When the water quality meets the requirements, the background control personnel remotely control the opening of the flexible weir 13 and the electric valve 31 on the first drain pipe 14, and the water is discharged outside the body through the first drain pipe 14. In addition, as Figure 1 shown, the natural sedimentation tank 5 of this embodiment is also provided with an overflow port 21. If the background control personnel do not carry out water discharge outside the body, it can be naturally discharged through the overflow port 21 after reaching the maximum capacity of the tank body.

[0034] Further, as a preferred technical solution of this embodiment, in order to form a drainage guide for the drainage of the flexible weir 13, as Figure 1 and Figure 3 shown, a collecting pipe 28 is installed at the front end of the flexible weir 13 in the natural sedimentation tank 5. In addition, in order to ensure the purification degree of the water body in the natural sedimentation tank 5, an oil collecting pipe 27 is installed in the natural sedimentation tank 5, and an oil drain pipe 29 communicated with the oil collecting pipe 27 is installed outside the natural sedimentation tank 5. An electric valve 30 is installed on the oil drain pipe 29; the floating oil in the natural sedimentation tank 5 is collected through the oil collecting pipe 27. After the electric valve 30 on the oil drain pipe 29 is opened, the oil is collected through the oil drain pipe 29 and then discharged and treated uniformly.

[0035] It should be noted that the diversion pool 1, accident pool 2, coagulation reaction pool 3, inclined tube sedimentation tank 4 and natural sedimentation tank 5 of the runoff treatment system for the highway pavement or bridge deck can meet the water flow problem through the head difference method, or the water flow of the required water body can be satisfied by installing pumps on each pool body or management. When adopting the form of pool body height difference, the flexible weir 13 and the electric valve 31 on the first drain pipe 14 can be controlled to be normally open. Since the flexible weir 13 in the natural sedimentation tank 5 continuously drains water, its liquid level drops and forms a head difference with the inclined tube sedimentation tank 4. Under the action of pressure, the inclined tube sedimentation tank 4 automatically replenishes water into the natural sedimentation tank 5 through the sedimentation connecting pipe 11 and the one-way valve 20 on the sedimentation connecting pipe 11. Similarly, after the liquid level in the inclined tube sedimentation tank 4 drops, the coagulation reaction pool 3 automatically replenishes water into the inclined tube sedimentation tank 4 through the water distribution hole 9 and the one-way valve 19 at the water distribution hole 9. Embodiment 2

[0036] Since chemicals need to be put into the coagulation reaction pool 3 to make the rainwater react with the chemicals, in order to achieve automatic chemical dosing and save labor costs, a chemical dosing device is also installed in this embodiment on the basis of Embodiment 1.

[0037] As Figure 1 shown, the chemical dosing device includes a chemical dissolution tank 32, a chemical dosing machine 33 capable of dosing into the chemical dissolution tank 32, and a stirrer 34 installed in the chemical dissolution tank 32. The chemical dissolution tank 32 is connected to the first drain pipe 14 outside the natural sedimentation tank 5 through a pipeline and a three-way joint, and it is connected through a pipeline and a pipeline mixer 35. The pipeline mixer 35 is installed on the pipeline between the diversion pool 1 and the coagulation reaction pool 3. A liquid level gauge 36 is installed in the chemical dissolution tank 32; a metering pump 37 is installed on the pipeline connecting the chemical dissolution tank 32 and the pipeline mixer 35; an electromagnetic valve 38 is installed on the pipeline connecting the chemical dissolution tank 32 and the first drain pipe 14 outside the natural sedimentation tank 5.

[0038] The working principle of the chemical dosing device is as follows:

[0039] Adding water to the chemical dissolution tank 32: The background control personnel remotely control to close the electric valve 31 on the first drain pipe 14 and open the electromagnetic valve 38 on the pipeline connecting the chemical dissolution tank 32 and the first drain pipe 14; the flexible weir 13 can lead the purified water body in the natural sedimentation tank 5 into the chemical dissolution tank 32, and observe the liquid level through the liquid level gauge 36 in the chemical dissolution tank 32; until the water volume is appropriate, close the electromagnetic valve 38 on the pipeline connecting the chemical dissolution tank 32 and the first drain pipe 14, and at the same time open the electric valve 31 on the first drain pipe 14. Adding chemicals to the chemical dissolution tank 32: The background control personnel remotely control the chemical dosing machine 33 to dose into the chemical dissolution tank 32, and start the stirrer 34 installed in the chemical dissolution tank 32 to mix and stir the chemicals and water to form a chemical agent. Finally, start the metering pump 37 to transport the chemical agent to the pipeline mixer 35, and complete the mixing of the rainwater and the chemical agent at the pipeline mixer 35. Example 3

[0040] During the long-term use of the runoff treatment system for the highway pavement or bridge deck, sludge deposits will exist in the coagulation reaction tank 3, inclined tube sedimentation tank 4, and natural sedimentation tank 5. Therefore, based on Examples 1 and 2, this example adds a sludge discharge device.

[0041] As Figure 1 shown, due to the C-shaped layout of the coagulation reaction tank 3, inclined tube sedimentation tank 4, and natural sedimentation tank 5, a set of sludge discharge devices is shared by the coagulation reaction tank 3 and the natural sedimentation tank 5, and a set of sludge discharge devices is used separately for the inclined tube sedimentation tank 4. A first sludge discharge pipe 39 is installed at the bottom of the coagulation reaction tank 3 and the natural sedimentation tank 5, and a first sludge discharge solenoid valve 40 is installed on the first sludge discharge pipe 39; a second sludge discharge pipe 41 is installed at the bottom of the inclined tube sedimentation tank 4, and a second sludge discharge solenoid valve 42 is installed on the second sludge discharge pipe 41. When sludge discharge from the corresponding tank body is required, the first sludge discharge solenoid valve 40 and / or the second sludge discharge solenoid valve 42 can be started.

[0042] It should be noted that in the above Examples 1, 2, and 3, the equipment such as liquid level gauges, baffle plates, inclined tubes, turbidity detectors, flexible decanters, electric valves, flow meters, flow limiting valves, check valves, turbidity detectors, oil collecting pipes, water collecting pipes, chemical dosing machines, mixers, in-line mixers, metering pumps, and solenoid valves are all commercially available products. They can be selectively purchased according to the actual engineering requirements and the tank volumes of the diversion tank 1, accident tank 2, coagulation reaction tank 3, inclined tube sedimentation tank 4, and natural sedimentation tank 5. The installation between the above equipment and the tank body, as well as the installation between the equipment and the pipelines, adopt conventional technical means, such as: fixing inside the tank body through hoop bodies, installing between pipelines through components such as pipe joints, etc.

[0043] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A runoff treatment system for a highway pavement or bridge deck, characterized in that: The runoff treatment system for the highway pavement or bridge deck includes a diversion tank, an accident tank, a coagulation reaction tank, an inclined tube sedimentation tank and a natural sedimentation tank; The diversion tank is connected to the drainage ditch of the highway pavement or bridge deck through a pipeline, and is respectively connected to the accident tank and the coagulation reaction tank through pipelines; a liquid level gauge is installed in the accident tank; a baffle plate and a liquid level gauge are installed in the coagulation reaction tank, and a water distribution hole communicating with the inclined tube sedimentation tank is provided at the bottom of the tank body; inclined tubes are installed in the inclined tube sedimentation tank, and the clarification area of the inclined tube sedimentation tank is connected to the natural sedimentation tank through a sedimentation connecting pipe; a turbidity detector, a flexible decanting device and a first drain pipe connected to the flexible decanting device are installed in the natural sedimentation tank; The runoff treatment system for the highway pavement or bridge deck further includes on-off flow control components installed on the pipeline between the diversion tank and the accident tank, on the pipeline between the diversion tank and the coagulation reaction tank, at the water distribution hole, and on the sedimentation connecting pipe.

2. The runoff treatment system for highway pavement or bridge deck according to claim 1, characterized in that: The on-off flow control components include an electric valve installed on the pipeline between the diversion tank and the accident tank, an electric valve, a flowmeter and a flow limiting valve installed on the pipeline between the diversion tank and the coagulation reaction tank, a check valve installed at the water distribution hole, and a check valve installed on the sedimentation connecting pipe.

3. The runoff treatment system for a highway pavement or bridge deck according to claim 1, characterized in that: The diversion tank is provided with an overflow port, and a turbidity detector is installed in the tank.

4. The runoff treatment system for highway pavement or bridge deck according to claim 1, characterized in that: The inclined tube sedimentation tank is provided with a second drain pipe and a third drain pipe, and electric valves are installed on both the second drain pipe and the third drain pipe.

5. The runoff treatment system for highway pavement or bridge deck according to claim 1, characterized in that: An oil collecting pipe and a water collecting pipe are installed in the natural sedimentation tank, an oil drain pipe communicated with the oil collecting pipe is installed outside the natural sedimentation tank, and the water collecting pipe is connected to the flexible decanting device in the natural sedimentation tank; electric valves are installed on both the oil drain pipe and the first drain pipe.

6. The runoff treatment system for highway pavement or bridge deck according to claim 5, characterized in that: The runoff treatment system for the highway pavement or bridge deck further includes a chemical dosing device, which includes a chemical dissolution tank, a chemical dosing machine capable of dosing into the chemical dissolution tank, and a stirrer installed in the chemical dissolution tank; the chemical dissolution tank is connected to the first drain pipe outside the natural sedimentation tank through a pipeline, and is connected to a pipeline mixer through a pipeline, and the pipeline mixer is installed on the pipeline between the diversion tank and the coagulation reaction tank.

7. The runoff treatment system for highway pavement or bridge deck according to claim 6, characterized in that: A liquid level gauge is installed in the chemical dissolution tank; a metering pump is installed on the pipeline connecting the chemical dissolution tank and the pipeline mixer; a solenoid valve is installed on the pipeline connecting the chemical dissolution tank and the first drain pipe outside the natural sedimentation tank.

8. The runoff treatment system for highway pavement or bridge deck according to claim 1, characterized in that: A first sludge discharge pipe is installed at the bottom of the coagulation reaction tank and the natural sedimentation tank, and a first sludge discharge solenoid valve is installed on the first sludge discharge pipe; a second sludge discharge pipe is installed at the bottom of the inclined tube sedimentation tank, and a second sludge discharge solenoid valve is installed on the second sludge discharge pipe.

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