JP2006028844A - Road-surface wastewater treatment tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a road-surface wastewater treatment tank which is continuously provided and buried in a side ditch, so as to remove polluted matter from road-surface waste water in rainfall and clean the wastewater. <P>SOLUTION: This road-surface wastewater treatment tank 1 comprises a top surface wall concrete block 53 which is provided at the height of the side ditch 2, a lower concrete block 51 wherein first and second circular tanks 11 and 12 are juxtaposed, and an upper concrete block 52. After being flown into the circular tank 11 and swirled, and flown out into the circular tank 12, road-surface wastewater is flown into the circular tank 12 and whirled, and flown into the circular tank 11 again. Bottoms 16 and 26 of respective tanks serve as sedimentation and separation parts 17 and 27, and ceiling walls 18 and 24 serve as floating and separation parts 19 and 27. An outflow tank 9 is provided in such a manner that the circular tank 12 is adjacent to a communication passage 31 of a tank wall 30 of a side part of the bottom 26; a horizontal pipe 32 for flowing the treated road-surface wastewater to the outside of the tank is provided in the upper part of the outflow tank 9; and an overflow part 10, which directly discharges the road-surface wastewater, flowing into the tank 1 from the upstream side ditch 2a on the upsides of the ceiling walls 18 and 24 of the respective circular tanks, to the downstream side ditch 2b, is provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a road surface drainage treatment tank for separating and removing precipitates or floating substances contained in road surface drainage during rainfall by connecting to a side groove of a road on which an automobile travels.

  On road surfaces where national roads and other automobiles travel, earth and sand, dust, suspended substances in the air, particulate matter floating in the water, so-called SS, worn tires of automobile tires and paved asphalt, and accidents Various pollutants such as car fuel are deposited. During the rain, these pollutants flow into the public water areas such as rivers, lakes, and coastal waters through rainwater and drainage facilities, or to the fields around rivers and lakes, causing water pollution around the outflow basin. It is one of the causes.

  The above-mentioned pollutant accumulated on the road surface is discharged as road drainage mainly due to the initial rainwater during the rain. However, it is said that this road drainage usually has three patterns of pollution depending on the state of rainfall.

  First, the first pattern is a case where rainfall with a constant rainfall intensity continues. In this case, the pollutant concentration in the road drainage is high at the beginning of rainfall. However, two hours after the start of rainfall, the road surface is washed away and the pollution concentration converges.

  The second pattern is a case where the initial rainfall is small and then the rainfall rapidly increases. In this case, the pollution concentration in the road drainage is high at the beginning of the rain, but the pollution once decreases. However, when the rainfall intensity increases, the pollution in the road drainage rises again to a high concentration.

  The third pattern is when it rains or stops. That is, the initial rainfall time is short, and during this period, the rainfall is the smallest, but the rainfall is increased during the next rainfall. In this case, a certain amount of rainfall is required for the pollutant on the road surface to flow out. Therefore, the pollution concentration at the next rainfall is higher than the pollution concentration at the beginning of the rainfall.

  By the way, although there are the three patterns described above, most of the road surface pollutant material flows out by the first flush water of the first or second pattern in the first two hours of rainfall. Among them, the SS substance which is a particulate substance floating in the road surface drainage is the biggest cause of the road surface drainage pollution. Therefore, by selectively treating and purifying these first flush waters, it is possible to drastically reduce the load caused by pollutants in the road surface drainage.

  An apparatus for selectively storing only the first flush water of such road drainage and leading it to a purification tank has been developed. This is because a drainage trough installed in a side gutter on the road where the car is running has a water collection trough, and a storage / purification tank is installed under the adjacent sidewalk. As a result, not only the particulate matter of the SS substance but also the soluble substance showing the hardly decomposable COD is removed. The filtered wastewater is drained by a drainage pipe at the bottom of the storage / purification tank, and is supplied to an existing drainage pipe or penetrated into the surrounding underground (for example, see Non-Patent Document 1).

  Furthermore, the rain that falls on the road on which the automobile is traveling is put into a side ditch via the road surface, collected from the side ditch into a settling tank beside the side ditch, and removed to remove large debris. After putting the wastewater into the tank and dropping the wastewater into the lower part of the treatment tank, the polluted material is filtered and adsorbed by flowing upward in the filter medium of expanded polypropylene particles to remove the purified wastewater from the adjacent drainage basin. Drain into the groove. Wastewater exceeding the treatment amount is discharged without being treated as overflow water to a drainage facility such as a gutter (see Non-Patent Document 2, for example).

"FF Cleaner" Shiga Prefecture, Biwako and Yodogawa Water Safety Organization, Toray Engineering Co., Ltd., brochure "Road surface wastewater treatment system" Hokucon Co., Ltd., 2003/01/15, pamphlet

  The problem to be solved by the present invention is to accurately treat only the first flush water, which is the road surface drainage within 2 hours of the first flush in the initial stage of the rain, and the soil and sand contained in the first flush water of the road surface drainage It accurately removes dust, suspended matter in the air, so-called SS, which is particulate matter suspended in water, wear debris from automobile tires and paving asphalt, and car fuel in the event of an accident. It is a road surface drainage treatment tank that is laid in a ditch on the road where only the treated water that has been purified is infiltrated underground into the soil through the crushed stone layer, or the purified treated water flows from the crushed stone layer to the sewage. It is to provide a highly efficient road surface drainage treatment tank.

  Means of the present invention for solving the above-mentioned problems comprises, in the invention of claim 1, the road surface drainage treatment tank 1 having a circular tank embedded in the basement and continuously provided in the side gutter 2 of the road, The upper surface wall 6 of the waste water treatment tank 1 is provided at the height position of the upper surface 2 c of the side groove 2, and the circular tank embedded in the basement is from the first circular tank 11 and the second circular tank 12 adjacent to the first circular tank 11. An inflow tank 7 is formed on the side of the first circular tank 11, and the outlet 13 is formed in the bottom of the inflow tank 7. The inflow tank 7 is open to the upstream side groove 2 a and has a bottom 8 below the bottom surface 3 of the side groove 2. Then, the inlet 15 is formed in the circumferential direction of the peripheral wall surface 14 of the first circular tank 11, the outlet 13 and the inlet 15 are communicated, and the ceiling wall 18 of the first circular tank 11 and the second circular tank 12 ceiling walls 24 are formed lower than the position of the bottom surface 3 of the side groove 2, and the first circular tank 1 is formed below the outlet 13. The bottom 16 of the second circular tank 12 and the bottom 26 of the second circular tank 12 are provided, and the bottom and ceiling walls of the first circular tank 11 are used as the sediment separator 17 and the float separator 19. And the upper part outlet of the first circular tank 11 in the circumferential direction of each peripheral wall surface of the upper part of the boundary wall 20 of the first circular tank 11 and the second circular tank 12. 21 and the upper inlet 23 of the second circular tank 12 are provided as an upper communication path 20a, and the reflux outlet 28 of the second circular tank 12 and the first circular are formed in the circumferential direction of each peripheral wall surface below the boundary wall 20. A reflux inlet 29 of the tank 11 is provided to form a lower communication path 20b, and the upper communication path 20a is used as a feed path for feeding road surface drainage swirling and rising from the bottom 16 of the first circular tank 11 to the second circular tank 12, Road surface drain that turns and descends the lower communication path 20b from the ceiling wall of the second circular tank 12 A part of the tank is used as a reflux path for returning to the first circular tank 11, and an outflow tank 9 is provided adjacent to the second circular tank 12 to discharge the road surface drainage, and the tank on the outflow tank 9 side of the second circular tank 12 is provided. A communication passage 31 that communicates from the bottom 26 of the second circular tank 12 to the outflow tank 9 is disposed at the lower part of the wall 30, and a horizontal pipe 32 that discharges treated water to the outside of the tank is provided at the upper part of the side wall of the outflow tank 9, Road surface wastewater flowing into the inflow tank 7 from the side groove 2a on the upstream side overflows directly from the upper part of the inflow tank 7 without passing through the first circular tank 11 and the second circular tank 12, and flows downstream from above the outflow tank 8. Road surface drainage treatment tank 1, characterized in that overflow portion 10 that is discharged untreated into side groove 2 b is disposed on ceiling wall 18 of first circular tank 12 and ceiling wall 24 of second circular tank 12. It is.

  In the second aspect of the invention, the second circular tank 12 crosses the inside of the adjacent outflow tank 8 horizontally from the side wall of the second circular tank 12 and the vertical pipe portion 38 provided with the suction port 37 at the bottom, and comes out of the tank. 2. The road surface wastewater treatment tank 1 according to claim 1, further comprising a siphon pipe 36 comprising a horizontal pipe part 39 and a vertical pipe part 40 having an outlet 41 at the tip of the pipe.

  In the invention of claim 3, the road surface drainage treatment tank 1 has a casing made of a concrete block, and the concrete block is disposed on the upper surface wall concrete block 53 forming the upper surface wall and below the upper surface wall concrete block 53. An upper concrete block 52 that forms an overflow portion 10 having the top walls 18 and 24 of the first circular tank 11 and the second circular tank 12 at the bottom, and the upper concrete block. The lower concrete block 51 formed from the lower part of the inflow tank 7, the first circular tank 11, the second circular tank 12, and the lower part of the outflow tank 8 is arranged below the block 52, and these blocks are stacked one above the other. The road surface wastewater treatment tank (1) according to claim 1 or 2, which is connected to each other.

  The present invention embeds a road surface drainage treatment tank connected to a side gutter of a road on which an automobile runs, in the basement of a sidewalk beside the road, and in the basement of the side of the road when there is no sidewalk, Sediment, dust, dust suspended in the air, particulate matter suspended in rain water, particulate matter suspended in rainwater, automobile tires and paving asphalt wear debris, and car fuel in the event of an accident In the circular tank at the bottom of the road surface wastewater treatment tank, it is separated and removed by swirling with the road surface drainage, settling and floating, and the removed road surface drainage flows out to the crushed stone layer outside the tank and underground soil The road surface drainage generated from the rain that exceeds the time of the first flush is allowed to overflow or overflow into the circular tank. By bypassing it and discharging it to the side gutter downstream, it is possible to accurately separate and remove the road surface contaminants contained in the first flush water within 2 hours of the beginning of the rain, and to provide excellent road drainage treatment. It is a tank. In particular, by constructing the circular tank, which is the lower part of the road surface wastewater treatment tank, from the first circular tank and the second circular tank adjacent to it, the depth of the basement for installation is compared to the case of only one circular tank. The horizontal width can be narrowed, and the sedimentation and floating of pollutants can be circulated between the two tanks, which can be purified more efficiently than the case of only one circular tank.

  Furthermore, when the casing of the road surface drainage treatment tank of the present invention is formed from a concrete block, the concrete block is divided into an upper wall concrete block, an upper concrete block, and a lower concrete block, so that the shape is compared with a concrete block having an integral shape. As a result of being simplified and easy to mold, and being divided into concrete blocks, each can be downsized, resulting in easier transportation to the site and easier handling when laying on site, etc. The present invention has an excellent effect.

  The best mode for carrying out the present invention will be described below with reference to the drawings. 1 to 5 show a road surface drainage treatment tank according to an embodiment of the present invention.

  The road surface wastewater treatment tank 1 of the present invention is laid in the basement of a sidewalk 4 formed adjacent to a side groove 2 on the side of a road of a road on which a national road or other automobile travels. As the road surface wastewater treatment tank 1, the casing is formed of a rigid and durable material, but is generally formed of a concrete block. That is, it is formed from the lower concrete block 51, the upper concrete block 52, and the upper wall concrete block 53.

  In this case, the upper wall concrete block 53 corresponds to the upper wall 6 of the upper tank 5 of the road surface wastewater treatment tank 1. The upper surface wall 6 is installed at the same height as the upper surface 2 c of the side groove 2. The road surface wastewater treatment tank 1 receives the road surface wastewater from the upstream side groove 2a, further includes a grating lid 54 on the upper wall concrete block 53 that is the upper surface wall 6, and directly receives the road surface drainage flowing from the grating lid 54 to the sidewalk. To do. On the other hand, the main body portion of the road surface drainage treatment tank 1 formed from the upper concrete block 52 and the lower concrete block 51 flows out of the inflow tank 7 for taking in the road surface drainage having the bottom 8 at a position lower than the bottom surface 3 of the side groove 2 and the outside of the tank. And an upper tank 5 that forms an overflow part 10. Furthermore, the lower side of the upper tank 5 has a first circular tank 11 and a second circular tank 12 for separating and treating the contents of the road surface drainage.

  The inflow tank 7 is disposed on the upstream side groove 2a side, and the bottom 8 of the inflow tank 7 has an outlet 13 for draining road surface water flowing from the upstream side groove 2a. Further, a circumferential inflow port 15 is opened in the peripheral wall surface 14 of the first circular tank 11 below the upper tank 5, and the road surface drainage discharged from the outflow port 13 of the inflow tank 7 passes through the inflow port 15. It flows in the circumferential direction along the tank wall of the first circular tank 11. That is, the road surface wastewater to be treated flows and swirls upward from the inlet 15 along the peripheral wall surface 14 of the first circular tank 11. Further, the bottom 16 of the first circular tank 11 is used as a precipitate separation unit 17 for separating the precipitate in the contents of the road surface drainage. On the other hand, the ceiling wall 18 of the first circular tank 11 serves as a floating substance separating unit 19 that floats and separates floating substances contained in the road surface drainage while turning upward along the tank wall.

  In order to flow out the road surface drainage separated into a part of the second circular tank 12 while flowing and swirling upward along the tank wall of the first circular tank 11 and separating the sediment and the suspended matter into the second circular tank 12, the first circular tank 11 and the second circular tank 12, an upper outlet 21 is disposed on the upper part of the boundary wall 20, and a circumferential upper inlet 23 is opened to communicate with the peripheral wall surface 22 on the upper part of the second circular tank 12. ing. The road surface drainage flowing from the upper inlet 23 of the second circular tank 12 is swung down in the circumferential direction along the tank wall. Further, a floating substance separating unit 25 that floats and separates floating substances in the road surface water swirling and descending the ceiling wall 24 of the second circular tank 12 is used, and the bottom 26 of the second circular tank 12 is separated into the sediment remaining in the road surface water. It is set as the deposit separation part 27 to be made.

  Further, a reflux outlet 28 for returning a part of the road drainage from the second circular tank 12 to the first circular tank 11 is provided below the boundary wall 20 between the first circular tank 11 and the second circular tank 12. 12 is provided in the direction of the first circular tank 11 along the peripheral wall surface 22 of the lower tank wall, and a reflux inlet 29 is opened in the lower part of the first circular tank 11 and a reflux outlet 28 is opened in the circumferential direction of the tank wall. Communicate. The road drainage returned to the first circular tank is merged with the road drainage from the inlet 15 and swirls upward along the peripheral wall surface 14 of the tank wall to further separate precipitates and floating substances while ascending. Then, the road surface drainage flows out again from the upper outlet 21 to the upper inlet 23 of the second circular tank 12. In order to flow out the drainage of the road surface thus circulated from the second circular tank 12, the outflow tank is formed from the bottom 26 of the second circular tank 12 to the lower part of the tank wall 30 facing the boundary wall 20 of the second circular tank 12. 9 is provided to communicate with the outflow tank 9. The upper part of the outflow tank 9 is closed at the position of the bottom surface 3 of the side groove 2. On the other hand, a horizontal pipe 32 extending outside the tank is disposed on the tank wall on the upper side of the outflow tank 9. The outlet of the horizontal pipe 32 is disposed in the soil outside the tank or in the sewer pipe.

  Furthermore, the upper part of the inflow tank 7 composed of the upper concrete block 52, the upper part of the ceiling wall 18 of the first circular tank 11, the upper part of the ceiling wall 24 of the second circular tank 12, and the upper part of the ceiling wall 24 of the second circular tank 12, It is provided at the same height as the bottom of the side groove 2. In the case of road surface drainage that exceeds the first flush at the time of rainfall, the pollutant on the road surface has already flowed out by the first flush, so the road surface drainage that has flowed in from the upstream side groove 2a is passed through the first circular tank 11 and the second circular tank 12. Without passing through, it overflows, that is, overflows, and is discharged directly from the top of the outflow tank 9 into the downstream side groove 2b. For this reason, the tank wall between the upper part of the inflow tank 7 and the upper part of the ceiling wall 18 of the 1st circular tank 11 is connected by the opening 33, and also the upper part of the ceiling wall 18 of the 1st circular tank 11 and the 2nd circular tank There is no boundary wall between the tops of the 12 ceiling walls 24

  Furthermore, in the embodiment of the second invention, in addition to the structure of the above-described embodiment, the road surface drainage treatment tank 1 is the second circular tank 12 and the upward vertical pipe portion 38 is provided with the suction port 37 at the tank bottom. And a horizontal pipe part 39 that forms a top part of the siphon that horizontally crosses the inside of the adjacent outflow tank 9 from the tank wall 30 of the second circular tank 12 and goes out of the tank, and a vertical pipe that has an outlet 41 at the front end. A siphon tube 36 including a tube portion 40 is provided. By lowering the suction port 37 of the siphon tube 36 to a position closer to the bottom 26 of the second circular tank 12, the treated road drainage flowing out from the second circular tank 12 can be lowered to the position of the suction port 37. The drainage pipe that separates the siphon pipe 36 and the horizontal pipe 32 from the road surface is used as a discharge pipe. By adding the siphon pipe 36 to the horizontal pipe 32, the road surface drainage can flow out of the road surface drainage treatment tank 1 more efficiently.

  In the embodiment of the present invention, in the above basic configuration, the road surface drainage treatment tank 1 is composed of a concrete block, and is composed of a lower concrete block 51, an upper concrete block 52, and an upper wall concrete block 53. Needless to say, the road surface drainage treatment tank 1 may be formed of a block having sufficient rigidity and durability such as cast iron other than concrete. In the drawings, the black arrows indicate the road drainage that flows after being processed in the first circular tank 11 and the second circular tank 12, and the white arrows indicate the first circular tank 11 and the second circular tank when it rains beyond the first flash. The flow of the road surface drainage which does not go through circular tank 12, but overflows, ie overflows, directly overflows the upper part of the 1st circular tank 11 and the 2nd circular tank 12, and is discharged without being processed into downstream gutter 2b.

  As shown in the present embodiment, the present invention reduces the height of the circular tank by arranging the circular tanks to be settled and floated adjacent to each other adjacent to the first circular tank 11 and the second circular tank 12. In addition, since it is processed while circulating between the first circular tank 11 and the second circular tank 12, the pollutant contained in the road surface drainage can be separated and removed more efficiently with higher accuracy than the conventional one. It became more environmentally friendly.

It is a top view of the road surface wastewater treatment tank of embodiment of this invention, and is AA arrow line view of FIG. It is side surface sectional drawing of the road surface wastewater treatment tank of embodiment of this invention. It is a BB arrow line view of FIG. It is CC arrow line view of FIG. FIG. 3 is a DD arrow view of FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Road surface wastewater treatment tank 2 Side groove 2a Upstream side groove 2b Downstream side groove 2c Upper surface 3 Bottom surface 4 Sidewalk 5 Upper tank 6 Upper surface wall 7 Inflow tank 8 Bottom 9 Outflow tank 10 Overflow part 11 1st circular tank 12 2nd circular tank 13 Outlet 14 Circumferential wall 15 Inlet 16 Bottom 17 Sediment separator 18 Ceiling wall 19 Float separator 20 Boundary wall 21 Upper outlet 22 Perimeter wall 23 Upper inlet 24 Ceiling wall 25 Float separator 26 Bottom 27 Sediment Separator 28 Reflux outlet 29 Reflux inlet 30 Tank wall 31 Communication path 32 Horizontal pipe 33 Open 34 Open 35 Open 36 Siphon pipe 37 Suction port 38 Vertical pipe section 39 Horizontal pipe section 40 Vertical pipe section 41 Outlet 51 Lower concrete block 52 Upper concrete block 53 Top wall concrete block 54 Grating lid

Claims (3)

  The road surface drainage treatment tank 1 has a circular tank embedded in the casing and connected to the side groove 2 of the road, and the upper surface wall 6 of the road surface wastewater treatment tank 1 is provided at a height position of the upper surface 2c of the side groove 2. A circular tank buried underground is formed from a first circular tank 11 and a second circular tank 12 adjacent to the first circular tank 11, opened to the side groove 2 a on the upstream side, and below the bottom surface 3 of the side groove 2. 8 is provided at the side of the first circular tank 11, the outlet 13 is formed at the bottom of the inflow tank 7, and the inlet 15 is formed in the circumferential direction of the peripheral wall surface 14 of the first circular tank 11. The outlet 13 and the inlet 15 are communicated, and the ceiling wall 18 of the first circular tank 11 and the ceiling wall 24 of the second circular tank 12 are formed lower than the position of the bottom surface 3 of the side groove 2 and the outlet. 13, a bottom 16 of the first circular tank 11 and a bottom 26 of the second circular tank 12 are provided below the first circular tank 11. And the ceiling wall are the sediment separator 17 and the suspended matter separator 19, the bottom and ceiling wall of the second circular tank 12 are the sediment separator 27 and the float separator 25, and the first circular tank 11 An upper outlet 21 of the first circular tank 11 and an upper inlet 23 of the second circular tank 12 are provided in the circumferential direction of each peripheral wall surface above the boundary wall 20 of the second circular tank 12 to form an upper communication path 20a. A reflux outlet 28 of the second circular tank 12 and a reflux inlet 29 of the first circular tank 11 are provided in the circumferential direction of each peripheral wall surface below the boundary wall 20 to form a lower communication path 20b, and an upper communication path 20a is formed. Road drainage that swirls and rises from the bottom 16 of the first circular tank 11 is used as a feed path for feeding to the second circular tank 12, and the lower communication path 20 b is used for road drainage that swirls and descends from the ceiling wall of the second circular tank 12. A part of the flow is returned to the first circular tank 11 and drains the road drainage. For this purpose, an outflow tank 9 is provided adjacent to the second circular tank 12, and the second circular tank 12 communicates with the outflow tank 9 from the bottom 26 of the second circular tank 12 at the bottom of the tank wall 30 on the outflow tank 9 side. A passage 31 is provided, a horizontal pipe 32 is provided in the upper part of the side wall of the outflow tank 9, and the treated water flows out of the tank. Further, the first circular tank 11 and the road surface wastewater flowing into the inflow tank 7 from the side groove 2a on the upstream side are provided. The overflow part 10 overflows directly from the upper part of the inflow tank 7 without passing through the second circular tank 12 and is discharged untreated from the upper part of the outflow tank 8 to the downstream side groove 2b. The road surface wastewater treatment tank 1, which is disposed on the wall 18 and the ceiling wall 24 of the second circular tank 12.   The second circular tank 12 includes a vertical pipe part 38 having a suction port 37 at the bottom, a horizontal pipe part 39 horizontally traversing the outflow tank 8 from the side wall of the second circular tank 12 and out of the tank, The road surface wastewater treatment tank (1) according to claim 1, further comprising a siphon pipe (36) comprising a vertical pipe section (40) having an outflow port (41) at the leading end.   The road surface drainage treatment tank 1 has a casing made of a concrete block. The concrete block is composed of a top wall concrete block 53 that forms a top wall, an upper part of the inflow tank 7 and an outflow of the top wall concrete block 53. The upper concrete block 52 which forms the overflow part 10 which makes the upper part of the tank 8, the 1st circular tank 11 and each ceiling wall 18 and 24 of the 2nd circular tank 12 the bottom, and arrange | positions under this upper concrete block 52 Of the lower concrete block 51 formed from the lower part of the inflow tank 7 and the first circular tank 11 and the second circular tank 12 and the lower part of the outflow tank 8, and these blocks are stacked vertically and connected to each other. The road surface wastewater treatment tank (1) according to claim 1 or 2, characterized by the above.

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