JP2011115727A - Oil-water separation drainage system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil-water separation drainage system for efficiently separating and removing oil contained in water without using an oil adsorption material. <P>SOLUTION: The oil-water separation drainage system includes a plurality of continuously installed separation tanks 8a to 8m and the separation tank 8a installed in a flow-in region P in the most upstream side works as a flow-in tank, the separation tanks 8k to 8m installed in a drainage region Q in the most downstream side work as drainage tanks, and the separation tanks 8b to 8j installed in an oil-water separation region R work as oil-water separation tanks. The separation tanks 8b to 8j in the oil-water separation region R are communicated to one another through communication ports 16b to 16i formed in the partitioning walls 6b to 6i and the partitioning walls 6b to 6j positioned between neighboring separation tanks are so configured as to gradually increase the flow channel surface areas of the communication ports 16b to 16i more as the partitioning walls are positioned more downward in the flow direction of water to be treated. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an oil / water separation / drainage system for separating and removing oil contained in treated water such as rainwater.

  Rainwater flowing from a predetermined area such as a factory or a warehouse may contain oil leaked from a stored container, oil attached to the stored container, oil leaked during work, and the like. When rainwater containing this oil component flows into a river through a gutter or the like, the gutter or river is contaminated with oil, which is one of the causes of environmental pollution.

  For this reason, an oil / water separation system is known in which oil contained in rainwater is separated and removed and drained into a gutter (see, for example, Patent Document 1). In this known oil-water separation and drainage system, a plurality of continuously provided separation tanks are provided, the most upstream separation tank functions as an inflow tank, and the most downstream separation tank functions as a drainage tank. A separation tank between the water tank and the drainage tank functions as an oil / water separation tank. In this oil / water separation tank, the oil contained in the water is separated, and the water from which the oil has been separated and removed is drained from the drainage tank to the outside.

JP 2009-6291 A

  In this conventional oil / water separation and drainage system, a drainage pump for draining is provided in the drainage tank, and water accumulated in the drainage tank (water from which oil has been separated and removed) is drained to the outside by the drainage pump. An oil adsorbing member is provided in the inflow tank and the oil / water separation tank on the downstream side thereof, and oil contained in the water is adsorbed by the oil adsorbing member. Also, an oil detection sensor is provided in the inflow tank, and when the oil adsorption by the oil adsorbing member is insufficient and the oil detection sensor detects oil, the drain pump is stopped and drainage from the drain tank is stopped. .

  However, in such an oil / water separation / drainage system, separation / removal of oil using an oil adsorbing member is mainly performed. Therefore, there is a problem in that the ability to separate and remove oil depends on the performance of the oil adsorbing member.

  An object of the present invention is to provide an oil / water separation / drainage system capable of effectively separating and removing oil contained in water without using an oil adsorbing member.

In the oil-water separation and drainage system according to claim 1 of the present invention, a plurality of separation tanks provided continuously are provided, and the separation tank disposed in the inflow area on the most upstream side functions as an inflow tank, and the most downstream The separation tank disposed in the drainage area on the side functions as a drainage tank, the separation tank disposed in the oil-water separation area located between the inflow area and the drainage area functions as an oil-water separation tank, In the oil / water separation / drainage system, the treated water flowing into the inflow tank is separated from the oil / water while flowing through the oil / water separation tank, and the water from which the oil is separated is drained from the drainage tank.
The plurality of separation tanks are partitioned by a partition wall, and the plurality of oil / water separation tanks disposed in the oil / water separation area are communicated through a communication port provided in a bottom portion of the partition wall, and between adjacent oil / water separation tanks. The partition wall that is positioned is configured such that the flow passage area of the communication port gradually increases as it is positioned downstream as viewed in the flow direction of the treated water.

  Moreover, in the oil-water separation / drainage system according to claim 2 of the present invention, the oil-water separation area includes a first oil-water separation area located upstream as viewed in the flow direction of the treated water, and the first oil-water separation area. A plurality of oil / water separation tanks disposed in the first oil / water separation area, and communicated with each other through a communication port provided in a bottom portion of the partition wall. The partition wall positioned between the separation tanks is configured such that the flow passage area of the communication port gradually increases as it is positioned downstream as viewed in the flow direction of the treated water, and is disposed in the second oil / water separation region. The plurality of oil / water separation tanks that flow through the drainage tank downstream and alternately pass through the upper side of the partition wall and the lower side of the partition wall.

  Moreover, in the oil-water separation / drainage system according to claim 3 of the present invention, the oil-water separation tank located on the upstream side of the second oil-water separation area is configured to flow through the upper side of the partition wall. The inflow portion of the oil / water separation tank on the upstream side of the second oil / water separation zone is provided with a projecting frame portion that projects upward from the partition wall, and adsorbs and removes oil from the central opening of the projecting frame portion. The oil adsorbing means is provided.

  Further, in the oil / water separation / drainage system according to claim 4 of the present invention, a large number of oil / water separation / drainage systems are provided upstream and / or downstream of the oil adsorbing means disposed in the oil / water separation tank upstream of the second oil / water separation zone. A flow straightening plate provided with a flow path hole is disposed, and oil-water separation is performed using Karman vortex streets generated by the flow straightening plate.

  Furthermore, in the oil-water separation and drainage system according to claim 5 of the present invention, an inflow rectifying plate provided with a plurality of flow path holes is disposed in the inflow portion of the inflow tank and / or the flow path of the inflow tank. In addition, oil-water separation is performed using Karman vortex streets generated by the second rectifying plate.

  According to the oil-water separation and drainage system according to claim 1 of the present invention, a plurality of separation tanks are continuously provided in the flow direction of the treated water, and the separation tank disposed in the inflow area functions as an inflow tank, The separation tank disposed in the drainage area functions as a drainage tank, and the separation tank disposed in the oil-water separation area functions as an oil-water separation tank. The plurality of separation tanks are partitioned by a partition wall, and the plurality of oil / water separation tanks disposed in the oil / water separation area are communicated through a communication port provided at the bottom of the partition wall and located between adjacent oil / water separation tanks. Since the partition wall is configured so that the flow passage area of the communication port gradually increases as it is located on the downstream side when viewed in the flow direction of the treated water, the oil-water separation tank located on the downstream side flows through the flow passage. The flow rate of treated water becomes slow. As a result, the treated water flows downstream through the communication port at the bottom of the partition wall, and during this flow, the oil contained in the water floats upward and floats on the treated water surface. In particular, since the flow rate of treated water is slower in the downstream oil / water separation tank, even fine oil floats up, floats on the treated water surface, and effectively separates the oil in the treated water while flowing through the oil / water separation zone. Can be removed. Therefore, the treated water from which the oil has been removed is drained from the drainage tank, and contamination by oil such as gutters and rivers can be prevented.

  Moreover, according to the oil-water separation / drainage system according to claim 2 of the present invention, the plurality of oil-water separation tanks in the first oil-water separation area on the upstream side communicate with each other through the communication port provided at the bottom of the partition wall. Since the partition wall located between the oil and water separation tanks is configured to gradually increase the flow passage area of the communication port as it is positioned on the downstream side, the treated water flows downstream through the communication port at the bottom of the partition wall. In this flow, the oil contained in the water floats upward, and thus even fine oil in the treated water can be separated and removed. Further, the plurality of oil / water separation tanks disposed in the second oil / water separation area on the downstream side alternately flow through the upper side of the partition wall and the lower side of the partition wall to the downstream side. It flows slowly through the long flow path of the tank, and during this flow, fine oil remaining in the treated water floats up and accumulates on the treated water surface, and the residual oil can also be separated and removed reliably.

  According to the oil / water separation / drainage system of the third aspect of the present invention, the inflow portion of the oil / water separation tank on the upstream side of the second oil / water separation area is provided with the protruding frame portion protruding upward from the partition wall. Since the oil adsorbing means is disposed in the central opening of the projecting frame portion, the treated water flowing into the oil-water separation tank flows manually from the upper side through the oil adsorbing means without flowing in from the side, The oil contained in the treated water can be reliably adsorbed and removed by the adsorbing means.

  Moreover, according to the oil-water separation / drainage system according to claim 4 of the present invention, the rectifying plate is provided upstream and / or downstream of the oil adsorbing means disposed in the oil-water separation tank upstream of the second oil-water separation zone. Since it is arranged, the flow of the treated water flowing through the oil adsorbing means can be rectified by this rectifying plate, and thereby the adsorption by the oil adsorbing means can be performed more effectively. In addition, a Karman vortex train is formed on the downstream side immediately after the flow straightening plate, and fine oil particles are entangled and enlarged by the Karman vortex train, so that it is easy to float and oil-water separation can be performed effectively.

  Furthermore, according to the oil-water separation and drainage system of the fifth aspect of the present invention, since the inflow rectifying plate is disposed in the inflow portion of the inflow tank (and / or the flow path of the inflow tank), The flow of the treated water flowing to the oil / water separation tank in the separation area can be rectified, and the oil / water separation in the oil / water separation area can be effectively performed. In particular, a Karman vortex street is formed on the downstream side immediately after the inflow rectifying plate, whereby fine oil particles become large and oil-water separation can be performed effectively.

The top view which shows 1st Embodiment of the oil-water separation drainage system according to this invention. Sectional drawing which shows the oil-water separation drainage system of FIG. Sectional drawing which shows 2nd Embodiment of the oil-water separation drainage system according to this invention. The perspective view which shows the baffle plate applied to the oil-water separation / drainage system of FIG. Sectional drawing which shows 3rd Embodiment of the oil-water separation drainage system according to this invention. FIG. 6 is a partial perspective view showing an oil adsorbing means applied to the oil / water separation / drainage system of FIG. 5 and a configuration related thereto.

  Hereinafter, with reference to an accompanying drawing, an embodiment of an oil-water separation drainage system according to the present invention is described.

1st Embodiment With reference to FIG.1 and FIG.2, the oil-water separation system of 1st Embodiment is demonstrated. 1 and 2, the illustrated oil / water separation / drainage system 2 includes a separation tank body 4 for treating treated water as required. The separation tank body 4 is elongated in the direction of the treated water flow (left and right in FIGS. 1 and 2). In this embodiment, the treatment tank body 4 is partitioned by 12 partition walls 6 (6a to 6j). These partition walls 6a to 6j provide thirteen separation chambers 8 (8a to 8m), and the separation chambers 8a to 8m flow in directions indicated by arrows 10 (from right to left in FIGS. 1 and 2). Are provided continuously. Such an oil-water separation and drainage system 2 is provided in relation to a side groove of a building, and separates and removes oil contained in rainwater flowing through the side groove as described, and the rainwater from which oil has been separated and removed is on the downstream side. Drained.

  An inflow area P into which treated water to be treated, for example, rainwater flows, is provided on the most upstream side in the flow direction of the treated water, and one separation tank 8a on the most upstream side is disposed in the inflow area P. The separation tank 8a functions as an inflow tank into which treated water flows. Two or more inflow tanks may be provided in the inflow area P.

  Further, on the most downstream side, a drainage area Q for draining the treated water to the outside is provided, and in this drainage area Q, three separation tanks 8k, 8l, 8m on the most downstream side are arranged, Such separation tanks 8k, 8l, and 8m function as drain tanks for draining treated water. In this embodiment, three drainage tanks are provided in the drainage area Q, but one, two, or four or more may be provided.

  Furthermore, between the inflow area P and the drainage area Q, an oil / water separation area R for separating and removing oil contained in the treated water (for example, rainwater) is provided, and nine separations are provided in the oil / water separation area R. Tanks 8b, 8c, 8d, 8e, 8f, 8g, 8h, 8i and 8j are provided, and the separation tanks 8b to 8j function as an oil / water separation tank for separating and removing the oil in the treated water. The oil / water separation tank can be provided with an appropriate number for separating and removing the oil in the treated water, and for example, it is desirable to provide four or more.

  The separation tank 8a (inflow tank) in the inflow area P will be described. The separation tank 8a is defined by a partition wall 6a disposed in the processing tank body 4, and an inflow portion 14 is provided on the upstream side thereof. Treated water (for example, rainwater flowing in the side groove) flows into the separation tank 8a (inflow tank) from the inflow portion 14. A communication port 16a is provided at the bottom of the partition wall 6a that defines the separation tank 8a, and flows to the downstream oil-water separation region R through the communication port 16a.

  The separation tank 8b (8c...) Of the oil / water separation area R is defined by a pair of adjacent partition walls 6a, 6b (6b, 6c...) Disposed in the processing tank body 4, and the partition wall 6b. A communication port 16b (16c...) Is provided at the bottom of (6c...), And flows to the downstream separation tank 8c (8d...) Through this communication port 16b (6c...).

  The separation tank 8k (81) in the drainage area Q is defined by a pair of adjacent partition walls 6j, 6k (6k, 6l) disposed in the treatment tank body 4. In addition, the separation area 8m is defined by a partition wall 8l disposed in the processing tank body 4. The separation tank 8k (81, 8m) is provided with a pair of drain pipes 18k (181, 18m), and the lower end of the drain pipe 18k (181, 18m) extends to the bottom of the separation tank 8k (81, 8m). The upstream end portion is curved and extends through the upper portion of the partition wall 6k (6l, the end wall 20 of the treatment tank body 4) to the downstream side.

  In the oil / water separation / drainage system 2, the flow passage cross-sectional areas of the communication ports 16a to 16j of the partition walls 6a to 6j defining the separation tanks 8b to 8j arranged in the oil / water separation area R are seen in the flow direction of the treated water. It is comprised so that it may become large as it is located downstream. In this embodiment, each communication port 16a-16j is provided over the whole width of the partition walls 6a-6j, and the height (space | interval between the bottom wall 22 of the process tank main body 4 and each partition wall 6a-6j) H1. As shown in FIG. 2, H10 becomes higher toward the downstream side, and the flow rate of the communication ports 16a to 16j is increased by gradually increasing the height of the communication ports 16a to 16j in this way. The cross-sectional area gradually increases toward the downstream side in the flow direction. Instead of changing the heights of the communication ports 16a to 16d, the flow path cross-sectional area is gradually increased by changing the length in the width direction or the height and the length in the width direction. May be.

  As a specific example of the oil / water separation and drainage system, the heights H1 to H10 of the communication ports 16a and 16j of the partition walls 6a to 6i are such that the depth H of the treatment tank body 4 is about 150 cm, for example. The height H1 of the communication port 16a is, for example, about 10 cm, the height H2 of the communication port 16b of the partition wall 6b is, for example, about 10 cm, and the partition wall 6c (or 6d, 6e, 6f, 6g, 6h, 6i, 6j). ) Communication port 16c (or 16d, 16e, 16f, 16g, 16h, 16i, 16j) has a height H3 (or H4, H5, H6, H7, H8, H9, H10) of, for example, 30 cm (or 40 cm, 50 cm, 60 cm, 70 cm, 80 cm, 90 cm, 100 cm).

  Oil / water separation using the oil / water separation / drainage system 2 is performed as follows. The treated water to be treated flows from the inflow portion 14 of the separation tank 8a (inflow tank) in the inflow area P, and flows from the separation tank 8a to the separation tank 8b in the oil / water separation area R through the communication port 16a of the partition wall 6a. Further, the separation tanks 8b to 8j flow to the drainage area Q downstream.

  When the treated water flows through the oil / water separation region R, the flow passage cross-sectional area of the communication ports 16a to 16i of the partition walls 6a to 6i increases as it is located on the downstream side in the flow direction indicated by the arrow 10, so that the downstream side in the flow direction The flow rate of the treated water flowing through the separation tanks 8b to 8j located in the tank becomes slower, and as the flow rate becomes slower in this way, the floating of the oil contained in the treated water is promoted. Accordingly, in the separation tank 8 (8b...) Upstream of the oil / water separation zone R, large oil in the treated water floats upward and is separated from the treated water, and the separation tank 8 (8f. , Small oil in the treated water floats upward and is separated from the treated water, and in the downstream separation tank 8 (8j...), The fine oil remaining in the treated water floats upward and is treated. The oil separated from the water is separated and removed in this way, and the treated water from which the oil has been separated and removed through the oil / water separation zone R flows into the separation tank 8K in the drainage zone Q through the communication port 16j of the partition wall 6j. .

  In the drainage area Q, the treated water at the bottom in the separation tank 8k (8j, 8m) (drainage tank) flows downstream to the separation tank 8l (8m, outside) through a pair of drainage pipes 18k (18l, 18m). At this time, in the separation tank 8k (8j, 8m), the remaining oil floats and stays on the treated water surface, and therefore, the treated water that flows downstream through the drain pipes 18k (18l, 18m) contains oil. In addition, by arranging such separation tanks (drainage tanks) in two or more stages, for example, three stages, oil remaining in the treated water can be completely removed.

Second Embodiment With reference to FIGS. 3 and 4, the oil / water separation system according to the second embodiment will be described. In the following embodiments, members substantially the same as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 3, the oil / water separation / drainage system 2A includes a separation tank main body 4A, and, as described above, the processing tank main body 4A is partitioned by twelve partition walls 6 (6A to 6J). 6J provides 13 separation chambers 8 (8A to 8M), and these separation chambers 8A to 8M are continuously provided in the flow direction indicated by the arrow 10 (the direction from right to left in FIG. 3).

  In the second embodiment, the oil / water separation zone R is a first oil / water separation zone R1 located upstream as viewed in the flow direction indicated by the arrow 10, and a first oil / water separation zone R1 located downstream of the first oil / water separation zone R1. It is comprised from 2 oil-water separation area R2. Four separation tanks 8B, 8C, 8D, and 8E are disposed in the first oil / water separation region R1, and the separation tanks 8B to 8E separate and remove oil in the treated water by using changes in flow velocity. Function as.

  Similar to the first embodiment, the separation tank 8B (8C to 8E) in the first oil / water separation region R1 has a pair of adjacent partition walls 6A and 6B (6B and 6C) disposed in the treatment tank body 4A. ...) and a communication port 16B (16C ...) is provided at the bottom of the partition wall 6B (6C ...). And like 1st Embodiment, the flow-path cross-sectional area of the communicating ports 16A-16E of the partition walls 6A-6E which prescribe | regulates the separation tanks 8B-8E arrange | positioned in 1st oil-water separation area R1 is treated water. In this embodiment, the height of each communication port 16A to 16E (the bottom wall 22 of the treatment tank body 4A and the partition walls 6A to 6E is increased. As shown in FIG. 3, the intervals H1 to H5 become higher toward the downstream side.

  In addition, five separation tanks 8F, 8G, 8H, 8I, and 8J are disposed in the second oil / water separation zone R2, and these separation tanks 8F to 8J use a long flow path length at a slow flow rate to process water. It functions as an oil separation tank that separates and removes oil. The separation tank 8F (8G to 8J) in the second oil / water separation area R2 is defined by a pair of adjacent partition walls 6E, 6F (6F, 6G,...) Disposed in the treatment tank body 4A. In the odd-numbered separation tank 8F (8H, 8J) from the upstream side in the two oil / water separation region R2, the upstream partition wall 6E (6G, 6I) extends downward from the upper end of the treatment tank body 4A, and the treated water Flows downstream through a gap between the bottom wall 22 of the treatment tank body 4A and the lower end of the partition wall 6E (6G, 6I), and the partition walls 6F (6H, 6J) on the downstream side of the treatment tank body 4A It extends upward from the bottom wall 22 and flows downstream through the upper side of the partition wall 6F (6H, 6J). In addition, the space | interval of the bottom wall 22 of the processing tank main body 4A and the lower end of the partition wall 6E (6G, 6I) is set to about 10-50 cm, for example.

  Further, in the even-numbered separation tank 8G (8I) from the upstream side in the second oil / water separation region R2, the upstream partition wall 6F (6H) is located above the bottom wall 22 of the treatment tank body 4A as described above. The partition wall 6G (6I) on the downstream side extends downward from the upper end of the processing tank body 4A, and there is a gap between the bottom wall 22 of the processing tank body 4A and the lower end of the partition wall 6G (6I). To do.

  In the second embodiment, an inflow rectifying plate 32 is further provided in the inflow portion 14 of the separation tank 8A (inflow tank) in the inflow area P. In addition, an inflow rectifying plate 34 is also disposed in the flow path of the separation tank 8A. As shown in FIG. 4, the inflow rectifying plates 32 and 34 are configured by a punch plate 38 provided with a large number of flow path holes 36. The channel hole 36 may have an appropriate shape such as a circle or an ellipse. For example, in the case of a circle, a channel having a diameter of about 5 to 10 mm is provided. By disposing such an inflow rectifying plate 32, treated water from the inflow portion 14 flows into the separation tank 8A through the inflow rectifying plate 32, and by disposing the inflow rectifying plate 34, the treated water in the separation tank 8A. The treated water flowing through the flow path flows through the inflow rectifying plate 34. In this embodiment, the inflow rectifying plates 32 and 34 are disposed at two locations of the separation tank 8A (inflow tank). The inflow rectification plates 32 and 34 are provided on either one of the separation tank 8A. A desired effect can be obtained by disposing at a location. Other configurations in the second embodiment are substantially the same as those in the first embodiment described above.

  The oil / water separation in the oil / water separation / drainage system 2A is performed as follows. The treated water to be treated flows from the inflow portion 14 of the separation tank 8a (inflow tank) in the inflow area P, and flows from the separation tank 8A to the separation tank 8B in the oil / water separation area R through the communication port 16A of the partition wall 6A. Furthermore, it flows into the drainage area Q downstream through the separation tanks 8B to 8J.

  When flowing in through the inflow portion 14, the treated water flows downstream through the numerous rectifying holes 36 of the inflow rectifying plate 32. A Karman vortex train is generated in the treated water when it flows through the inflow rectifying plate 32, and oil-water separation is performed using the Karman vortex. That is, on the downstream side immediately after the inflow rectifying plate 32, a region having a fast flow and a region having a slow flow are generated, and thereby, a Karman vortex is generated between the many flow passage holes 36 of the inflow rectifying plate 32. Fine oil particles are entangled and combined to form large oil particles, which are easily floated by the flow in the flow direction, and oil-water separation is facilitated. In addition, when the process water flows downward through the flow path of the separation tank 8A, the treated water flows downstream through the many rectifying holes 36 of the inflow rectifying plate 34, so that oil-water separation is performed using the Karman vortex street. By rectifying the treated water into a clean flow in the inflow zone P in this way, it is possible to more effectively perform oil separation and removal in the subsequent oil-water separation zone R (first and second oil-water separation zones R1, R2). it can.

  When the treated water flows through the first oil / water separation region R1 on the upstream side in the oil / water separation region R, the flow path cross-sectional areas of the communication ports 16A to 16E of the partition walls 6A to 6E are positioned downstream in the flow direction indicated by the arrow 10. Since it is large, the flow rate of the treated water flowing through the separation tanks 8B to 8E located on the downstream side in the flow direction becomes slower as in the first embodiment, and the treated water is utilized by utilizing such a change in the flow rate. In this way, large or small oil is separated and removed from the treated water.

  Further, when the treated water from which oil has been separated and removed through the first oil / water separation region R1 flows through the second oil / water separation region R2 on the downstream side, the partition walls 6F, 6H, 6J are moved upward from the bottom wall 22 of the treatment tank body 4A. Since the partition walls 6G and 6I extend downward from the upper end of the treatment tank main body 4A, the treated water flowing into the separation tank 8F of the second oil / water separation region R2 through the communication port 16E of the partition wall 6G is separated into the separation tank Flows upward in 8F, flows downward in the next separation tank 8G, further flows upward in the separation tank 8H, then flows downward in the separation tank I, and further flows upward in the separation tank 8J. It flows into the separation tank 8k in the area Q. In the separation tanks 8F to 8J in the second oil / water separation region R2, the treated water alternately flows upward and downward, so that the long flow path in the separation tanks 8F to 8J slowly flows, and the treated water is converted into the treated water during this flow. The remaining fine oil floats and stays on the surface, and the oil in the treated water can be separated and removed more effectively. The treated water that has flowed into the drainage area Q flows in the separation tanks 8K, 8L, and 8M downstream and is drained to the outside through the drainage pipe 18m in the same manner as in the first embodiment.

Third Embodiment With reference to FIG. 5 and FIG. 6, an oil-water separation system according to a third embodiment will be described. In FIG. 5, the basic configuration of the oil / water separation / drainage system 2B is substantially the same as that of the second embodiment described above, and the following improvements are further applied to the second embodiment.

  5 and 6, in the oil / water separation / drainage system 2B of the third embodiment, the inflow portion of the separation tank 8G in the second oil / water separation area R2, that is, the upper side of the partition wall 6F flows into the downstream separation tank 8G. Oil adsorbing means 42 is supplementarily provided at the site to be operated. In this embodiment, the protruding frame portion 44 is provided between the pair of partition walls 6F, 6G disposed in the processing tank body 4B, that is, between the upstream partition wall 6F and the downstream partition wall 6G. It has been. The protruding frame portion 44 has a rectangular shape, a rectangular opening 46 is provided at the center thereof, and the oil adsorbing means 42 is disposed in the opening 46. The oil adsorbing means 42 is composed of, for example, a bag-like member containing activated carbon, and this bag-like member is accommodated in the opening 46 of the protruding frame portion 44.

  As shown in FIG. 6, the projecting frame portion 44 projects upward from the upper end of the partition wall 6F. By projecting in this way, as shown in FIG. 5, the separation tank 8G and upstream thereof. The level of the treated water in the separation tanks 8A to 88F on the side becomes higher than the level of the treated water in the separation tanks 8H to 88M on the downstream side of the separation tank 8G. As a result, the oil-water separation process can be performed efficiently.

  Further, by disposing the oil adsorbing means 42 in the protruding frame portion 44 in this way, the treated water from the upstream separation chamber 8F does not flow from the side of the oil adsorbing means 32, and the protruding frame By flowing from the upper side of the portion 44 downward through the oil adsorbing means 42 and the treated water flowing in this way, the oil remaining in the treated water can be adsorbed and removed by the oil adsorbing means 42.

  A rectifying plate 52 can be provided in association with the oil adsorbing means 42. The rectifying plate 52 may have substantially the same configuration as the inflow rectifying plate 42 (44) in the second embodiment, and is provided at the bottom of the protruding frame portion 44 in this embodiment. By providing the rectifying plate 42 in this manner, the oil adsorbing means 42 can be easily accommodated in the opening 46 of the projecting frame portion 44, and the treated water can pass through the oil adsorbing means 42 in a rectified state. Thus, the oil in the treated water is effectively adsorbed by the oil adsorbing means 42. In addition, a Karman vortex street is formed on the downstream side immediately after the rectifying plate 52, and oil-water separation is facilitated using the Karman vortex street as described above.

  The rectifying plate 52 is provided on the downstream side of the oil adsorbing means 42 (for example, the bottom of the protruding frame portion 44), instead of the upstream side of the oil adsorbing means 42, that is, the upper part of the separation tank 8F (for example, a partition). It may be provided between the upper end of the wall 6F and the partition wall 6E), or may be provided both on the upstream side and the downstream side of the oil adsorbing means 42.

  As mentioned above, although various embodiment of the oil-water separation drainage system according to this invention was described, this invention is not limited to this embodiment, A various deformation | transformation thru | or correction | amendment are possible without deviating from the scope of the present invention. .

2,2A, 2B Oil / water separation and drainage system 4,4A, 4B Treatment tank body 6a to 6l, 6A to 6L Partition wall 8a to 8m, 8A to 8M Separation chamber 14 Inflow part 16a to 16j, 16A to 16E Communication port 32, 34 Inflow clear plate 42 Oil adsorbing means 44 Projection frame 52 Rectification plate P Inflow area Q Drainage area R Oil / water separation area R1 First oil / water separation area R2 Second oil / water separation area

Claims (5)

A plurality of continuous separation tanks are provided, the separation tank disposed in the inflow area on the most upstream side functions as an inflow tank, and the separation tank disposed in the drainage area on the most downstream side serves as a drainage tank. A separation tank disposed in an oil / water separation area that functions between the inflow area and the drainage area functions as an oil / water separation tank, and treated water that has flowed into the inflow tank flows through the oil / water separation tank. In the oil-water separation and drainage system in which oil and water are separated in between and the water from which the oil is separated is drained from the drainage tank,
The plurality of separation tanks are partitioned by a partition wall, and the plurality of oil / water separation tanks disposed in the oil / water separation area are communicated through a communication port provided in a bottom portion of the partition wall, and between adjacent oil / water separation tanks. The oil / water separation / drainage system is characterized in that the partition wall positioned is configured such that the flow passage area of the communication port gradually increases as the partition wall is positioned downstream as viewed in the flow direction of the treated water.   The oil / water separation area includes a first oil / water separation area located on the upstream side in the flow direction of the treated water, and a second oil / water separation area located on the downstream side of the first oil / water separation area. The plurality of oil / water separation tanks arranged in the oil / water separation area communicate with each other through a communication port provided at the bottom of the partition wall, and the partition wall located between adjacent oil / water separation tanks has a flow direction of the treated water. The plurality of oil / water separation tanks arranged in the second oil / water separation area are arranged so that the flow passage area of the communication port gradually increases as it is located on the downstream side as viewed in FIG. The oil-water separation / drainage system according to claim 1, wherein the oil-water separation / drainage system flows alternately to the lower side of the wall and flows downstream to the drainage tank.   The oil / water separation tank located upstream of the second oil / water separation area is configured to flow through the upper side of the partition wall, and flows into the oil / water separation tank upstream of the second oil / water separation area. The part is provided with a projecting frame part projecting upward from the partition wall, and an oil adsorbing means for adsorbing and removing oil is disposed in a central opening of the projecting frame part. 2. The oil-water separation and drainage system according to 2.   On the upstream side and / or downstream side of the oil adsorbing means disposed in the oil / water separation tank on the upstream side of the second oil / water separation area, a rectifying plate having a plurality of flow path holes is disposed, and the rectification is performed. The oil / water separation / drainage system according to claim 3, wherein oil / water separation is performed using Karman vortex street generated by the plate.   The inflow portion of the inflow tank and / or the flow path of the inflow tank is provided with a second rectification plate provided with a number of flow path holes, and a Karman vortex array generated by the second rectification plate is used. The oil / water separation / drainage system according to claim 1, wherein oil / water separation is performed.

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