Pavement runoff initial rain sewage multi-medium treatment device

Abstract

The utility model provides a pavement runoff initial rain sewage multi-medium treatment device which comprises an oil separation sedimentation tank, an oil separation plate is arranged in the tank body, a water flow channel is formed between the bottom end of the oil separation plate and the bottom surface of the tank body, and a floating type oil separation layer is arranged in the tank body at the upstream of the oil separation plate; the filler filter tank is positioned at the downstream of the oil separation sedimentation tank, and a filler layer is arranged in the filler filter tank; the cleaning tank is arranged above the oil separation sedimentation tank and the filler filter tank; the cleaning tank is communicated with the filler filter tank through a first cleaning pipeline, and a water outlet of the first cleaning pipeline is positioned on the side surface of the filler filter tank; the cleaning tank is connected with the bottom of the oil separation sedimentation tank through a second cleaning pipeline, and valves are mounted on the first cleaning pipeline and the second cleaning pipeline. According to the cleaning tank, high-pressure effluent can be provided by utilizing height difference, the filter material layer and the oil separation sedimentation tank are automatically cleaned, and the manual treatment cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of road runoff pollutant treatment, in particular to a road runoff initial rainwater and pollutant multi-media treatment device. Background Art

[0002] Road rainwater runoff contains a large amount of pollutants, especially initial rainwater runoff. A considerable amount of suspended particulate matter, ammonia nitrogen, organic pollutants and grease are concentrated in the initial rainwater runoff. Untreated initial runoff flows into water bodies, which can easily damage the water ecosystem and cause eutrophication and other problems. It is one of the non-point source pollution that cannot be ignored. For initial rainwater runoff, or also known as "initial polluted rainwater" or "initial rainwater", various relevant standards have given definitions and quantitative methods. For example, in the "Design Standard for Environmental Protection Engineering of Chemical Construction Projects" (GB / T 50483-2019), initial polluted rainwater is defined as "rainwater generated in the initial stage of rainfall in the polluted area, which should be taken as the rainfall of 15min~30min in the initial stage of rainfall, or the rainfall of 20mm~30mm thickness in the initial stage of rainfall". In the "Petrochemical Water Supply and Drainage System Design Code" (SH / T 3015-2019), it is stipulated that "the total amount of initial rainwater should be calculated as the product of the area of ​​the polluted area and the precipitation depth of 15mm~30mm".

[0003] In order to reduce the pollution risk caused by the initial rainwater runoff, the prior art has taken relevant technical measures. For example, Chinese patent document CN108585099A discloses a method for purifying rainwater runoff using fillers, which lays a water purification filter material activated carbon layer and a porous cement concrete aggregate layer, and uses the adsorption effect of the two fillers to remove ammonia nitrogen pollutants and total phosphorus pollutants in the water body. Chinese patent document CN109319873A also discloses a road rainwater runoff composite purification layer, which purifies suspended particles, nutrients and inorganic substances in the water body by paving filter materials such as volcanic rocks, zeolites, and slag. In addition, plant retention technology is also a common means of treating rainwater runoff. For example, Chinese patent document CN107882149A discloses a road rainwater ditch system, in which gravel shallow ditches, vegetation filter belts and rainwater purification ditches are arranged on both sides of the hardened road in sequence. The runoff after preliminary filtration of gravel is filtered, absorbed, and microbially degraded in the vegetation filter belt, and then treated in the rainwater purification ditch to meet the discharge standards.

[0004] The purification facilities in the above prior art can effectively remove specific pollutants in water, but the technical problem that still exists is that it is difficult for the above facilities to effectively remove oil and fat pollutants in runoff, which can easily cause the failure of filter materials or filtering devices. In addition, for highway runoff treatment facilities, especially those on highways and bridges far away from municipal areas, the cleaning and maintenance of the facilities is also a problem. Treatment facilities built outside the highway slope or under the side of the bridge usually do not have the space conditions for automatic cleaning devices, and manual cleaning and maintenance are not only inefficient, but also difficult to operate. Summary of the invention

[0005] The utility model solves the technical problems that the road runoff treatment facilities in the prior art are not good at removing grease and are not easy to clean and maintain, and further provides a road runoff initial rain and sewage multi-media treatment device that can effectively treat grease and reduce the difficulty of cleaning and maintenance.

[0006] The technical solution adopted by the utility model to solve the above technical problems is:

[0007] A multi-media treatment device for initial rainwater and sewage in road runoff, comprising: an oil-separating sedimentation tank, wherein a water inlet and an overflow port are respectively arranged on opposite sides of a tank body of the oil-separating sedimentation tank, a mud discharge port is arranged at the bottom of the tank body, and a top cover is arranged at the top of the tank body; an oil-separating plate is installed in the tank body, a water flow channel is formed between the bottom end of the oil-separating plate and the bottom surface of the tank body, and a floating oil-separating layer is arranged in the tank body upstream of the oil-separating plate; a packing filter tank, which is located downstream of the oil-separating sedimentation tank, and a packing layer is arranged in the packing filter tank; a cleaning tank, which is arranged above the oil-separating sedimentation tank and the packing filter tank; the cleaning tank is connected to the packing filter tank through a first cleaning pipe, and the water outlet of the first cleaning pipe is located on the side of the packing layer; the cleaning tank is connected to the bottom of the oil-separating sedimentation tank through a second cleaning pipe, and valves are installed on the first cleaning pipe and the second cleaning pipe.

[0008] The height difference between the cleaning tank and the oil separation sedimentation tank and the filler filter tank in the vertical direction is greater than or equal to 3 meters.

[0009] The cleaning pool is arranged at the top of the slope of the highway, or near the two ends of the bridge.

[0010] A drainage ditch is arranged on the side of the road surface, and the drainage ditch is connected with the water inlet of the oil separation sedimentation tank through a drainage pipe, and a drainage valve is installed on the drainage pipe.

[0011] The drainage ditch is communicated with the cleaning pool through a rainwater pipe, and a solenoid valve is installed on the rainwater pipe.

[0012] The floating oil barrier layer is detachably mounted on the inner wall of the pool body; a movable cover plate is arranged at the top cover above the floating oil barrier layer, and the floating oil barrier layer is connected with a suspension rope, one end of which extends to the movable cover plate.

[0013] The floating oil-isolating layer is one or more of an oil-absorbing cotton layer, an oil-absorbing felt layer, and a polyurethane foam particle layer.

[0014] A water distribution plate is arranged above the floating oil-isolating layer.

[0015] The packing layer is paved with multiple layers of packing, and the multiple layers of packing are a crushed stone layer, a zeolite layer and a quartz sand layer in order from top to bottom.

[0016] The filler filter tank adopts a downflow filler filter tank, and the drain outlet of the filler filter tank is located at the bottom of the filler filter tank.

[0017] The multi-media treatment device for initial rain and sewage of road runoff described in the utility model has the advantages of:

[0018] (1) The multi-media treatment device for initial rainwater and sewage of road runoff in the utility model is provided with an oil-separating sedimentation tank, a filler filter tank and a cleaning tank. The oil-separating sedimentation tank is provided with an oil-separating plate and a floating oil-separating layer, which can effectively remove oil and dirt in the initial runoff and prevent oil and grease pollutants from entering the subsequent filler filter tank. It can effectively extend the replacement cycle of the filler filter tank and play the role of precipitating particulate matter. The present application sets a cleaning tank above the oil-separating sedimentation tank and the filler filter tank. The cleaning tank is connected to the filler filter tank through a first cleaning pipe and is connected to the bottom of the oil-separating sedimentation tank through a second cleaning pipe. The cleaning tank is located above the oil-separating sedimentation tank and the filler filter tank, and can use the height difference to provide high-pressure water outlet to automatically clean the filter layer and the oil-separating sedimentation tank, thereby greatly reducing the manual processing cost.

[0019] (2) In the multi-media treatment device for initial rainwater and sewage of road runoff in the present invention, it is preferred that the height difference between the cleaning pool and the oil-separating sedimentation tank and the filler filter tank in the vertical direction is greater than or equal to 3 meters, and the cleaning pool is arranged at the top of the slope of the highway, or near the two ends of the bridge, thereby solving the problem that the rainwater runoff treatment facilities of the highway slope and bridge are difficult to clean and maintain. Also as a preferred embodiment, the present application is provided with a drainage ditch on the side of the road surface for collecting road runoff. The drainage ditch is connected to the water inlet of the oil-separating sedimentation tank through a drainage pipe, and the drainage ditch is connected to the cleaning pool through a rainwater pipe. A solenoid valve is installed on the rainwater pipe, which is used to open the solenoid valve after the initial rainwater runoff is discharged, and collect clean rainwater into the cleaning pool for cleaning the oil-separating sedimentation tank and the filler filter tank, thereby reducing the burden of manual cleaning and making full use of rainwater resources to further reduce maintenance costs.

[0020] In order to make the technical solution of the multi-media treatment device for initial rain and sewage of road runoff described in the utility model clearer, the utility model is further explained below in conjunction with specific drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure shows the structure of the multi-media treatment device for initial rain and sewage of road runoff according to the utility model;

[0022] The accompanying drawings are denoted as follows:

[0023] 1-oil-separating tank; 11-floating oil-separating layer; 12-water distribution board; 13-oil-separating board; 14-water inlet pipe of oil-separating tank; 15-movable cover; 16-hanging rope; 17-overflow port; 2-filling filter tank; 21-gravel layer; 22-zeolite layer; 23-quartz sand layer; 24-receiving net; 25-water outlet of filling filter tank; 3-drainage ditch; 4-cleaning tank; 5-drainage pipe; 51-drainage valve; 6-rainwater pipe; 61-solenoid valve on rainwater pipe; 7-first cleaning pipe; 71-valve on first cleaning pipe; 8-second cleaning pipe; 81-valve on second cleaning pipe; 9-water outlet of second cleaning pipe. DETAILED DESCRIPTION

[0024] This embodiment provides a multi-media treatment device for initial rain and sewage runoff on the road surface, such as Figure 1As shown, the multi-media treatment device includes an oil-separating sedimentation tank 1 and a filler filter tank 2 which are connected and arranged integrally. A drainage ditch 3 is arranged on the side of the road surface, and the drainage ditch 3 is connected to the water inlet of the oil-separating sedimentation tank through a drainage pipe 5, and a drainage valve 51 is arranged on the drainage pipe 5. The water inlet of the oil-separating sedimentation tank is located on one side of the tank body, and an overflow port 17 is also arranged on the other side opposite to it. A mud discharge port (not shown for view reasons) is arranged at the bottom of the tank body, and a top cover is arranged at the top of the tank body. An oil-separating plate 13 is installed in the tank body, and a water flow channel is formed between the bottom end of the oil-separating plate 13 and the bottom surface of the tank body. A floating oil-separating layer 2 is installed in the tank body located upstream of the oil-separating plate 13. In this embodiment, the floating oil-separating layer 2 adopts a polyurethane foam particle layer wrapped with oil-absorbing cotton, and a counterweight bar is arranged on the bottom edge of the floating oil-separating layer 2 to adjust the weight of the floating oil-separating layer 2 so that most of the floating oil-separating layer 2 is immersed below the water surface. A gap of 8-12 cm is provided between the side of the floating oil barrier 2 and the inner wall of the pool body. A movable cover plate 15 is provided at the top cover above the floating oil barrier 2, and a suspension rope 16 is connected to the floating oil barrier 2, and one end of the suspension rope 16 extends to the movable cover plate 15.

[0025] As a preferred embodiment, in this embodiment, a water inlet pipe 14 is installed at the water inlet to guide the incoming water into the pool body. A water distribution plate 12 is also arranged above the floating oil-isolating layer 2. The water distribution plate 12 is located directly below the water inlet of the water inlet pipe. Water-permeable holes are distributed on the water distribution plate 12 to reduce the impact force of the incoming water when the water inflow is large and adjust the distribution of the incoming water. The height difference between the lower surface of the water distribution plate 12 and the upper surface of the floating oil-isolating layer 2 is 5-10cm, so as to avoid the impact force caused by the excessive water flow drop from damaging the adsorption of grease. The area of ​​the water distribution plate 12 is smaller than that of the floating oil-isolating layer 2. There is an operating gap between the water distribution plate 12 and the oil-isolating plate 13, so that the floating oil-isolating layer 2 can be placed in or taken out of the pool body through the operating gap.

[0026] The filler filter 2 is located downstream of the oil separation sedimentation tank 1. Figure 1As shown, the filler filter 2 is separated from the oil separation sedimentation tank 1 by an overflow wall. A filler layer is arranged in the filler filter 2; the filler layer is paved with multiple layers of fillers, and the multiple layers of fillers are a gravel layer 21, a zeolite layer 22 and a quartz sand layer 23 from top to bottom. The thickness of the gravel layer is 20-30cm, and the particle size range of the gravel is 0.5-1cm; the thickness of the zeolite layer is 20-25cm, and the particle size range of the zeolite is 5-10mm; the thickness of the quartz sand layer is 20-25cm, and the particle size range of the quartz sand is 4-6mm. A receiving net 24 is installed below the filler layer, and the mesh of the receiving net 24 is less than 4mm. The filler filter 2 adopts a downflow filler filter, and the water outlet 25 of the filler filter is located at the bottom of the filler filter 2. As a preferred embodiment, in this embodiment, a water pump is arranged between the oil-water separator sedimentation tank 1 and the filler filter tank 2, the water inlet of the water pump is located in the tank body of the oil-water separator sedimentation tank 1 downstream of the oil separator plate, the water outlet is located in the filler filter tank and above the filler layer, and a water pump is installed on the water pump.

[0027] The filtering device is also provided with a cleaning pool 4, which is vertically lowered and located above the oil-separating sedimentation tank 1 and the filler filter tank 2; the cleaning pool 4 is connected to the filler filter tank 2 through a first cleaning pipe 7, and is connected to the bottom of the oil-separating sedimentation tank 1 through a second cleaning pipe 8. As shown in the figure, a valve 71 is provided on the first cleaning pipe 7, and a valve 81 is provided on the second cleaning pipe 8. The end of the first cleaning pipe 7 is connected to three water outlet branches, and the outlets of the three water outlet branches are arranged on the side of the filler layer in the vertical direction, corresponding to the gravel layer, the zeolite layer and the quartz sand layer respectively. The outlet 9 of the second cleaning pipe is located at the bottom of the oil-separating sedimentation tank 1. As a preferred embodiment, in this embodiment, the height difference between the cleaning pool 4 and the oil-separating sedimentation tank 1 and the filler filter tank 2 in the vertical direction is greater than or equal to 3 meters. When used for rainwater runoff treatment on highway pavement, the cleaning pool 4 can be set at the top of the highway slope, and the oil-separating sedimentation tank 1 and the filler filter tank 2 are set at the bottom of the side wave. When used for rainwater runoff treatment on bridge pavement, the cleaning pool 4 can be set near both ends of the bridge, and the oil-separating sedimentation tank 1 and the filler filter tank 2 can be set under the bridge. The drainage ditch is connected to the cleaning pool 4 through the rainwater pipe 6, and a solenoid valve is installed on the rainwater pipe 6. The drainage valve 51 of the drainage pipe and the solenoid valve 61 on the rainwater pipe are preferably wirelessly controlled solenoid valves to achieve remote operation.

[0028] The processing and cleaning process of the road runoff initial rain and sewage multi-media treatment device described in this embodiment is as follows:

[0029] The treatment device described in this embodiment is used for roads or bridge pavements near sensitive water bodies. After rain, the rainwater runoff on the road surface first flows into the drainage ditch. At this time, the drainage valve 51 on the drainage pipe 5 is in an open state, and the solenoid valve 61 on the rainwater pipe is in a closed state. The initial rainwater runoff enters the oil-separating sedimentation tank 1. The oil-separating sedimentation tank 1 is provided with an oil-separating layer and an oil-separating plate 13. When the rainwater flows downward through the oil-separating plate 13, part of the oil and fat pollutants in the water are adsorbed by the oil-separating layer, and the oil and fat pollutants that are not adsorbed flow with the water. Under the obstruction of the oil-separating plate 13, they float to the water surface again and are adsorbed by the oil-separating layer, completing the removal of oil and fat pollutants. At the same time, the oil-separating plate 13 plays a role in promoting the precipitation of particulate matter. The effluent of the oil-separating sedimentation tank 1 enters the filler filter 2 through the overflow port 17, and further removes pollutants such as ammonia nitrogen and COD in the water body under the adsorption action of the filler, and then is discharged through the drainage port of the filler filter 2. When a rainfall lasts for a long time and has a large rainfall amount, after the collection of the initial rainwater runoff is completed, the drain valve 51 on the drainage pipe 5 can be closed, and the solenoid valve 61 on the rainwater pipe can be opened, and the rainwater can be collected into the cleaning pool and retained for cleaning. The initial rainwater runoff in this embodiment can be set to a rainfall of 20mm~30mm thickness at the initial stage of rainfall according to actual conditions. After the rainfall ends, the water pump on the water pumping pipe can be turned on to pump the water in the oil separation sedimentation tank into the upper part of the packing layer in the packing filter tank to complete the treatment of the water in the oil separation sedimentation tank.

[0030] When the equipment needs to be maintained after the rain, the movable cover 15 can be opened, the oil barrier layer can be pulled out, the grease on the oil barrier layer can be scraped off or a new oil barrier layer can be replaced before putting it into the pool. When the packing layer needs to be cleaned, the valve on the first cleaning pipe can be opened, and the water in the cleaning pool passes through the first cleaning pipe under the action of water pressure to flush the filter layer from the side, and some of the adsorbed pollutants are washed away by the water flow to achieve the purpose of cleaning. When the oil separation sedimentation tank needs to be cleaned, the valve on the second cleaning pipe can be opened to flush the sludge at the bottom of the oil separation sedimentation tank, promote the discharge of sludge and the cleaning of the tank body.

[0031] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the claims.

Claims

1. A multi-media treatment device for initial rainwater and sewage from road runoff, characterized in that: include: An oil-separating sedimentation tank, wherein a water inlet and an overflow port are respectively arranged on opposite sides of a tank body of the oil-separating sedimentation tank, a mud discharge port is arranged at the bottom of the tank body, and a top cover is arranged at the top of the tank body; an oil-separating plate is installed in the tank body, a water flow channel is formed between the bottom end of the oil-separating plate and the bottom surface of the tank body, and a floating oil-separating layer is arranged in the tank body upstream of the oil-separating plate; A filler filter tank is located downstream of the oil separation sedimentation tank, and a filler layer is arranged in the filler filter tank; A cleaning tank is arranged above the oil-water separation sedimentation tank and the filler filter tank; the cleaning tank is connected to the filler filter tank through a first cleaning pipe, and the water outlet of the first cleaning pipe is located on the side of the filler layer; the cleaning tank is connected to the bottom of the oil-water separation sedimentation tank through a second cleaning pipe, and valves are installed on the first cleaning pipe and the second cleaning pipe.

2. The multi-media treatment device for initial rainwater and sewage of road runoff according to claim 1 is characterized in that: The height difference between the cleaning tank and the oil separation sedimentation tank and the filler filter tank in the vertical direction is greater than or equal to 3 meters.

3. The multi-media treatment device for initial rainwater and sewage of road runoff according to claim 1 or 2, characterized in that: The cleaning pool is arranged at the top of the slope of the highway, or near the two ends of the bridge.

4. The multi-media treatment device for initial rainwater and sewage of road runoff according to claim 3 is characterized in that: A drainage ditch is arranged on the side of the road surface, and the drainage ditch is connected with the water inlet of the oil separation sedimentation tank through a drainage pipe, and a drainage valve is installed on the drainage pipe.

5. The multi-media treatment device for initial rainwater and sewage of road runoff according to claim 4 is characterized in that: The drainage ditch is communicated with the cleaning pool through a rainwater pipe, and a solenoid valve is installed on the rainwater pipe.

6. The multi-media treatment device for initial rainwater and sewage of road runoff according to claim 5 is characterized in that: The floating oil barrier layer is detachably mounted on the inner wall of the pool body; a movable cover plate is arranged at the top cover above the floating oil barrier layer, and the floating oil barrier layer is connected with a suspension rope, one end of which extends to the movable cover plate.

7. The multi-media treatment device for initial rainwater and sewage of road runoff according to claim 6 is characterized in that: The floating oil-isolating layer is one or more of an oil-absorbing cotton layer, an oil-absorbing felt layer, and a polyurethane foam particle layer.

8. The multi-media treatment device for initial rainwater and sewage of road runoff according to claim 7 is characterized in that: A water distribution plate is arranged above the floating oil-isolating layer.

9. The multi-media treatment device for initial rainwater and sewage of road runoff according to claim 8, characterized in that: The packing layer is paved with multiple layers of packing, and the multiple layers of packing are a crushed stone layer, a zeolite layer and a quartz sand layer in order from top to bottom.

10. The multi-media treatment device for initial rainwater and sewage of road runoff according to claim 9, characterized in that: The filler filter tank adopts a downflow filler filter tank, and the drain outlet of the filler filter tank is located at the bottom of the filler filter tank.

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