JP2008284425A - Drainage separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drainage separator in which a filter part is made free in maintenance. <P>SOLUTION: The drainage separator has a separation tank 2 having a circular or a rectangular side wall 4. A partition plate 7 demarcates the separation tank 2 into a flow-in chamber 5 and a flow-out chamber 6. The partition plate 7 is provided with a plate-like filter part 8. A drainage supply part in the flow-in chamber 5 and a drainage discharge part in the flow-out chamber 6 are provided. The inside form of the side wall in the flow-in chamber 5 is composed to form a horizontal whirling flow of the incoming drainage, and an impurity collection part with a sectional area reduced downward is provided at the lower part of the central region of the whirling flow. This configuration allows effective separation of fine solid impurities to unnecessitate the maintenance of the filter part 8. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wastewater separation apparatus that separates solid impurities contained in wastewater such as sewers.

  Rainwater and other wastewater flowing into sewers laid in urban areas are often discharged into the ground by rainwater infiltration facilities and the rest are discharged into public water bodies. The rainwater drainage that circulates in the sewerage system contains solid impurities such as earth and sand, various garbage, papers, fallen leaves, etc. If these impurities flow into the rainwater infiltration facility, the equipment is frequently maintained. It is necessary and disadvantageous in terms of cost. Therefore, a wastewater separation device for separating solid impurities is provided in a part of the rainwater infiltration facility and a part of the sewer.

  As a wastewater separation device, a separation device that generates a swirling flow in the wastewater and separates solid impurities by the swirling flow is known (for example, trade name Flued Sep of UFT, Germany). In addition, an apparatus has been proposed in which impurities are separated by a filter method in order to separate solid impurities contained in oil (see, for example, Patent Document 1).

  In the separation apparatus disclosed in Patent Document 1, a plurality of hollow tubes having a small diameter are arranged in an annular shape in a separation tank to form a filter portion made of an annular body, and oil containing impurities is tangent from the outside of the annular body. Supply in the direction to generate a swirling flow. The swirl flow separates solid impurities adhering to the outside of the annular body, thereby reducing the labor of filter maintenance.

JP 2004-275957 A

  The former separation tank using the swirl flow is easy to maintain because it does not have a filter part, but it is difficult to separate fine solid impurities.

  Since the separation device disclosed in Patent Document 1 has a filter portion, it can also separate fine solid impurities. However, in the disclosed structure, while the separated impurities continue to swirl along the outer peripheral surface of the filter, they may converge on the central area of the swirling flow and reattach to the filter, so that the problem of maintenance free of the filter section It is hard to say that is completely resolved.

  In view of the above, an object of the present invention is to provide a wastewater separation device that achieves maintenance-free filter parts.

  In order to achieve the above object, a representative wastewater separation apparatus of the present invention is a device for separating solid impurities contained in wastewater, and includes a separation tank having a circular or square side wall, and an inflow chamber inside the separation tank. And a partition plate for partitioning into the outflow chamber, a plate-like filter unit attached to the partition plate, a drainage supply unit provided in the inflow chamber, and a drainage discharge unit provided in the outflow chamber. The inner shape is configured such that the inflowing drainage can form a horizontal swirling flow, and an impurity trapping portion whose cross section is reduced downward is provided below the central region of the swirling flow. To do.

  According to the wastewater separation device of the present invention, the fine solid impurities are effectively separated, so that maintenance of the filter unit is unnecessary.

  Hereinafter, the best embodiment of the waste water separation device according to the present invention will be described with reference to the drawings.

<< First Embodiment >>
1 (a) and 1 (b) show a wastewater separation apparatus 1 according to a first embodiment, which includes the following parts. The main separation tank 2 has a tank body 3 formed of a cylindrical side wall 4 having an open top, and the inside of the tank body 3 is separated from an inflow chamber 5 and an outflow by a V-shaped or L-shaped partition plate 7. It is partitioned into a chamber 6. The inflow chamber 5 is provided with a supply pipe 9 for introducing drainage, and two impurity trapping portions 11 whose cross section is reduced downward are provided at the bottom. Further, the outflow chamber 6 is provided with a drain pipe 10 for discharging drainage, and a guide path 13 extending to the drain pipe 10 is provided at the lower part. The supply pipe 9 and the drain pipe 10 are provided at positions facing the cylindrical side wall 4 at approximately approximately 180 °.

  The material of the tank body 3 having such a structure is made of, for example, concrete or FRP (fiber reinforced plastic), and when installed in the sewer system, it is buried in the ground in accordance with the sewer pipe, And is covered with a lid (not shown) such as an iron plate that is exposed and removable.

  On the other hand, plate-like filter portions 8 are respectively attached to the two sides of the partition plate 7. The partition plate 7 has a vertical length (height) in which the upper part extends from the bottom of the separation tank 2 to an intermediate height, and the drainage overflows from the inflow chamber 5 to the outflow chamber 6 in the open space of the upper part. An overflow portion 12 is formed and is detachably attached to the separation tank 2 by being fitted into a concave groove provided inside the side wall 4 from above. The material of the partition plate 7 is made of, for example, stainless steel or FRP, and is formed into a V shape with a sharp tip as shown in FIG. 1 by processing those plate materials. However, the shape is not limited to the V shape, and as will be described later, for example, as long as the waste water flowing into the inflow chamber 5 is divided into two and each can smoothly form a horizontal swirl flow, for example, It may be V-shaped with a tip formed in a circular or elliptical shape. Further, the V-shaped sandwiching angle can be arbitrarily selected as long as the horizontal swirling flow can be smoothly formed. However, according to experiments, it has been found that the V-shaped angle is preferably in the range of 60 ° to 90 °. Yes.

  Further, as the plate-like filter unit 8, for example, a punching metal plate or the like having a small-diameter hole processed by pressing is used for all or a part of the partition plate 7, or a metal mesh or a synthetic resin mesh is used. The attached net-like filter material is attached to the partition plate 7 by adhesion or fitting. The mesh range of the filter unit 8 is appropriately selected according to the size of solid impurities to be separated.

  Here, in this embodiment, the preliminary separation tank 20 is connected to the upstream side of the separation tank 2.

  The preliminary separation tank 20 has a side wall 21 and a bottom part 22, and an inflow part 23 that allows drainage to flow in so as to form a horizontal swirl flow along the inner side of the side wall 21, and an outflow part 24 that allows drainage to flow out, A guide path 25 extending from the lower part of the preliminary separation tank 20 to the outflow part 24 is provided. The inflow portion 21 is provided with a guide plate 23 a for allowing drainage to flow along the circular side wall 21. Further, an impurity trapping portion 26 whose cross section is reduced downward is provided at the bottom of the preliminary separation tank 20.

  The material of the preliminary separation tank 20 is made of, for example, concrete or FRP, as in the separation tank 2, and when it is installed in the sewer system, it is buried in the ground according to the pipe of the sewer, but the upper part is the ground surface. It is covered with a lid such as an iron plate that is exposed and removable.

  Next, an example of the case where the separation apparatus 1 according to the embodiment of FIG.

  Drainage is introduced into the inflow part 23 of the preliminary separation tank 20 from the sewer pipe. The introduced drainage flows along the inner peripheral surface of the side wall 21 by the guide plate 23a to form a horizontal swirling flow. Among the solid impurities contained in the waste water, those having a specific gravity greater than that of water gradually gather at the center of the swirling flow, descend and accumulate on the impurity trapping portion 26 provided below.

  On the other hand, most of the floating solid impurities or oil components having a specific gravity smaller than that of water float on the water surface region due to the action of the swirling flow and stay there. When a certain amount of impurities accumulated in the impurity trapping portion 26 and impurities staying in the water surface region reach a certain amount, the lid covering the upper portion of the preliminary separation layer 20 is removed and taken out to the outside by using a mesh bag or the like. Although the fine solid impurities are not separated in the preliminary separation tank 20, such fine solid impurities are separated in the separation tank 2.

  As shown in FIG. 2, the waste water containing fine solid impurities enters the outflow part 24 from the lower part of the preliminary separation layer 20 through the guide path 25, and then enters the inflow chamber 5 through the supply part 9 of the separation tank 2. Inflow. The drainage water that has flowed into the inflow chamber 5 is divided into two by the V-shaped partition plate 7 and flows along the inner peripheral surface of the cylindrical side wall 4. A directional swirl is formed.

  The drainage of the inflow chamber 5 swirls in such a horizontal direction, but a part of the drainage flows out to the outflow chamber 6 through the filter unit 8, and at this time, the fine solid impurities contained in the drainage are It is captured and separated by the filter unit. When the amount of solid impurities trapped (attached) on the filter unit 8 increases, a part of the impurities is separated by the horizontal swirling flow, resuspended in the drainage, and converged on the central region of the swirling flow. Therefore, there is no fear that the solid impurities once separated will reattach to the filter unit 8. A partition plate having a height from the bottom of the inflow chamber 5 to the bottom of the supply pipe 9 is provided from the apex of the V-shaped partition plate 7 to the cylindrical side wall 4 below the bottom of the supply pipe 9 to partition the inflow chamber 5. Thus, two swirling flows having different directivity of the vortex generated in the inflow chamber 5 can be efficiently generated.

  Further, in the inflow chamber 5, it becomes easy to generate a vertical swirl flow due to the shape of the impurity trapping part 11 in addition to the horizontal swirl flow. The descending action is promoted by the swirling flow in the direction, and is easily trapped by the impurity trapping portion 11. On the other hand, those having a small specific gravity are promoted in the floating action and stay in the upper part of the inflow chamber 5. The waste water that has flowed into the outflow chamber 6 passes through the guide path 13 from below and is discharged to the downstream sewer pipe, rainwater infiltration facility, and the like via the discharge unit 10.

  For example, when heavy rain falls, many solid impurities flow into the sewerage system along with a large amount of rainwater, and sometimes contain oil. At that time, floating solid impurities and oil that could not be captured by the preliminary separation layer 20 may also flow into the inflow chamber 5 of the separation tank 2. For example, when floating solid impurities such as paper waste or oil components flow into the inflow chamber 5, at least the upper portion of the filter unit 8 causes a clogging phenomenon, thereby temporarily reducing the filter function.

  In this embodiment, an overflow part 12 is formed in the open space part of the upper part of the partition plate 7 to allow the drainage to overflow from the inflow chamber 5 to the outflow chamber 6. Therefore, floating solid impurities and oil staying in the vicinity of the water surface are accompanied by the drainage and overflow from the overflow portion 12 and flow into the outflow chamber 6. Therefore, the blocking phenomenon of the filter unit 8 can be avoided.

  The effects of the first embodiment described above are summarized below.

  (1) Since the wastewater flowing into the inflow chamber of the separation tank is configured to form a swirling flow of a horizontal swirling flow, solid impurities attached to the filter portion are separated by the swirling flow of the horizontal direction. Converge to the central region. Therefore, there is no fear that the separated solid impurities are reattached to the filter portion.

  (2) Provided below the central region of the swirling flow in the inflow chamber is an impurity trapping portion whose cross section is reduced downward. As a result, in addition to the horizontal swirling flow, a vertical swirling flow is easily generated due to the shape of the impurity trapping portion, and solid impurities having a large specific gravity are lowered by the vertical swirling flow. Is promoted and is easily trapped by the impurity trapping portion. As a result, those having a low specific gravity are promoted in the floating action and stay in the upper part of the inflow chamber. Therefore, the effect of preventing reattachment of the separated solid impurities to the filter portion can be further enhanced, and the impurity recovery can be facilitated.

  (3) The supply part and the discharge part are arranged opposite to the side wall of the separation tank, and the partition plate has two sides so that the waste water supplied from the supply part is divided in the inflow chamber to form horizontal swirling flows, respectively. It has a V shape. As a result, impurity trapping portions can be provided below the two regions surrounded by the inside of the inflow chamber and each side of the partition plate. Therefore, it is possible to easily form a horizontal swirl flow simply by disposing a partition plate having a simple structure, and it is possible to construct a separation device with a simple structure and low cost.

  (4) If the inner side of the side wall in the separation tank is made circular, a horizontal swirling flow can be formed in each of two regions surrounded by the circular inner side and each side of the partition plate. If comprised in this way, a horizontal swirling flow can be easily formed using the circular inner shape of a separation tank.

<< Second Embodiment >>
Next, FIG. 3 shows the waste water separator according to the second embodiment. In this case, the separation tank 2 shown in FIG. 2 of the first embodiment is cylindrical, whereas the second embodiment is a structural example in which the side wall 4 of the separation tank 2 is formed into a square cross section. That is, the auxiliary plates 14 are disposed obliquely at the four corners of the side wall 4 having a square cross section that forms the inflow chamber 5. The auxiliary plate 14 is provided to promote the formation of two horizontal swirling flows as indicated by arrows. For example, by inserting the FRP auxiliary plate 14 from above into a concave groove formed in the side wall 4, The chamber 5 is detachably mounted.

  The length of the auxiliary plate 14 in the height direction can be the same as that of the partition plate 7, but is not limited thereto, and if the formation of the horizontal swirling flow can be promoted, the lower portion thereof is extended to the intermediate region of the inflow chamber 5. You can also. Further, if the formation of the horizontal swirling flow can be promoted, the auxiliary plate 14 can be only two on the left side of FIG. Further, the auxiliary plate 14 may be an arc shape instead of a flat plate as shown in the figure, and in the case of an arc shape, a swirl flow can be further formed.

  That is, according to the second embodiment, the inner side of the side wall 4 in the separation tank 2 is formed in a rectangular shape, and the auxiliary plate 14 is disposed at the corner of the rectangular shape, so that the inner side of the side wall of the inflow chamber is formed in a polygonal shape. In addition, a horizontal swirling flow can be formed in each of two regions surrounded by the inside of the polygon and each side of the partition plate. If comprised in this way, even if it uses the square separation tank with easy manufacture, a horizontal swirling flow can be formed easily.

<< Third Embodiment >>
FIG. 4 shows a wastewater separator according to the third embodiment. In this case, the separation tank 2 is configured according to FIG. 3 of the second embodiment, the horizontal cross section of the partition plate 7 is formed in a circular shape, and a plurality (four in the illustrated example) are provided at predetermined intervals in the circumferential direction. The filter section 8 having a circular cross section is attached. Further, a plurality of plate-like mounting plates 7a having relatively short heights are extended from the partition plate 7 in the radial direction, and the tip portions of the mounting plates 7a are respectively inserted into the recessed grooves formed inside the side walls 4 from above. Thus, the partition plate 7 is attached to the separation tank 2 concentrically and detachably.

  The inflow chamber 5 is provided with a drainage supply section 9, and the outflow chamber 6 is provided with a drainage discharge section 10, which are disposed opposite to the side wall 4. The drainage supply section 9 is provided with an arc-shaped guide plate 9a. By the action of the guide plate 9a, the waste water is supplied in the direction tangential to the inner side of the partition plate 7, whereby two horizontal swirling flows such as arrows are formed in the waste water. When the amount of solid impurities trapped by the filter unit 8 increases, a part thereof is separated by the horizontal swirling flow and descends in the drainage, and is provided below the two swirling flows and downwards. The cross section is trapped by the impurity trapping portion 11 having a reduced shape and deposited there. The waste water that has passed through the filter unit 8 is discharged from the discharge unit 10 to the downstream side. Even in the third embodiment, the guide path 13 as shown in the example of FIG. 1 can be provided from the bottom of the outflow chamber 6 to the discharge portion 10.

<< Fourth Embodiment >>
FIG. 5 shows a wastewater separator according to a fourth embodiment. In this case, the separation tank 2 is configured according to FIG. 4 of the third embodiment, and is different from the structure of FIG. A partition plate 7 having a circular horizontal cross section is attached to the separation tank 2 in an eccentric state, and the filter unit 8 is provided only on a part of the partition plate 7 (portion close to the supply unit 9). The supply unit 9 is provided with a guide plate 9a having an arcuate side wall in order to allow drainage to flow in the direction tangential to the inside of the partition plate 7, and the partition plate 7 is inserted from above into a groove formed in the guide plate 9a. Thus, the partition plate 7 is detachably attached to the separation tank 2. Then, a horizontal swirling flow is formed in the drainage in the inflow chamber 5 by the action of the guide plate 9a, and an impurity trapping portion 11 similar to that in FIG. 4 is formed below the central region of the swirling flow.

  According to the fourth embodiment, the inner side of the side wall 4 in the separation tank 2 is formed in a circular shape, and the horizontal section of the partition plate 7 is formed in a circular shape so that drainage can be supplied in the inner tangential direction of the partition plate 7. A supply unit 9 can be configured. With this configuration, a swirling flow in the horizontal direction can be easily formed, and since only one impurity trapping portion is provided below the separation tank, an operation of taking out accumulated impurities to the outside becomes easy.

  As mentioned above, although several embodiment was described about the waste_water | drain separation apparatus of this invention, it is not limited to those embodiment, In the range which does not deviate from the main point of this invention, other embodiment, an application example, a modification, and Combinations thereof are also possible.

  For example, the drainage to which the present invention can be applied includes rainwater flowing into the sewer from the road, general drainage, kitchen drainage at a restaurant, wastewater from a meat processing factory, and the like.

  In addition, an overflow part is provided on the upper part of the partition plate to allow drainage to overflow from the inflow chamber to the outflow chamber, and a guide path extending from the lower part of the outflow chamber to the discharge part is provided, and the drainage in the lower part of the outflow chamber is discharged through the guide path. Can be discharged from the department. At the same time, it can be configured so that solid floating impurities or oil can stay in the upper part of the outflow chamber. With this configuration, when floating impurities and oil remain in the upper part of the inflow chamber, the impurities and oil overflow from the overflow portion to the outflow chamber, so that part of the filter portion is caused by the floating impurities. It is possible to prevent clogging and contamination with oil. Then, the floating impurities and oil staying in the upper part of the outflow part may be taken out to the outside when reaching a certain amount.

  Moreover, the preliminary separation tank of only the swirling flow system which does not have a filter part in the front | former stage of a separation tank can be provided. By providing a simple separation tank with such a simple structure, many solid impurities and oil contained in the waste water are separated and removed in advance in the preliminary separation tank, and contain relatively fine solid impurities that cannot be separated there. Waste water can be supplied to the separation tank. In this way, since the amount of solid impurities separated in the filter section of the separation tank can be greatly reduced, the interval between operations for taking out the solid impurities accumulated in the impurity trapping section provided below the separation tank Can be long. Moreover, since the partition plate does not exist in the preliminary separation tank, solid impurities deposited on the impurity trapping portion can be easily taken out.

  Further, the inner side of the side wall in the preliminary separation tank may be formed in a circular shape or a rectangular shape, and the bottom portion may be provided with an impurity trapping portion formed in a tapered shape whose cross section decreases downward. Thus, since the preliminary | backup separation tank has the high freedom degree of the shape, a suitable shape can be selected according to the objective.

(A), (b) is the plane sectional view and side sectional view which show 1st Embodiment which concerns on the waste_water | drain separation apparatus of this invention. The plane sectional view showing typically a drainage flow also in the separation tank of the principal part in the 1st embodiment. Plan sectional drawing which shows the separation tank of 2nd Embodiment which concerns on the waste_water | drain separation apparatus of this invention. Plan sectional drawing which shows the separation tank of 3rd Embodiment which concerns on the waste_water | drain separation apparatus of this invention. Plan sectional drawing which shows the separation tank of 4th Embodiment which concerns on the waste_water | drain separation apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waste water separator 2 Separation tank 3 Tank main body 4 Side wall 5 Inflow chamber 6 Outflow chamber 7 Partition plate 8 Filter part 9 Supply pipe 10 Drain pipe 11 Impurity capture part 13 Guide way 20 Preliminary separation tank 21 Side wall 22 Bottom 23 Inflow part 24 Outflow Part 25 Guide way 26 Impurity trapping part

Claims (8)

In an apparatus for separating solid impurities contained in wastewater,
A separation tank having a circular or square side wall;
A partition plate that partitions the inside of the separation tank into an inflow chamber and an outflow chamber;
A plate-like filter portion attached to the partition plate;
A drainage supply section provided in the inflow chamber;
A drainage section provided in the outflow chamber;
The inner shape of the side wall in the inflow chamber is configured so that the inflowing drainage can form a horizontal swirling flow, and the impurity trapping portion whose cross section decreases downward is below the central region of the swirling flow. A wastewater separator characterized by being provided.   In Claim 1, a supply part and a discharge part are opposingly arranged by the side wall of a separation tank, and a partition plate is divided so that the waste_water | drain supplied from a supply part may divide | distribute in an inflow chamber, and each forms a swirl flow of a horizontal direction. A drainage separation apparatus, wherein an impurity trapping portion is provided below each of two regions formed in a V shape having sides and surrounded by the inside of the inflow chamber and each side of the partition plate.   In Claim 2, the inside of the side wall of the inflow chamber is formed in a circular shape by making the inside of the side wall in the separation tank circular, and each of the two regions surrounded by the circular inside and each side of the partition plate is horizontal. A wastewater separation device characterized in that a swirling flow is formed.   In Claim 2, the inside of the side wall in a separation tank is formed in a rectangle, and the inside of the side wall of an inflow chamber is formed in a polygon by arrange | positioning an auxiliary | assistant board in the corner | angular part of the rectangle, The inside of the polygon and a partition A drainage separation apparatus, wherein a horizontal swirl flow is formed in each of two regions surrounded by each side of a plate.   In Claim 1, the inside of the side wall in a separation tank is formed circularly, the partition plate with a horizontal cross section is circular inside the circular side wall, and a supply part supplies waste_water | drain in the inner tangent direction of a partition plate. The waste water separator characterized by being comprised.   6. An overflow part according to claim 1, wherein an overflow part for overflowing drainage from the inflow chamber to the outflow chamber is provided at the upper part of the partition plate, and a guide path extending from the lower part of the outflow chamber to the discharge part is provided. A wastewater separation device characterized in that drainage in the lower part of the chamber can be discharged from the discharge part through the guide passage, and solid floating impurities or oil can stay in the upper part of the outflow chamber.   7. A pre-separation tank having a side wall and a bottom is provided in any one of claims 1 to 6, and the pre-separation tank is an inflow for allowing drainage to flow along the inner side of the side wall so as to form a horizontal swirling flow. And a guide channel extending from the lower part of the separation tank to the outflow part. Solid impurities are separated from the wastewater by the swirling flow and deposited at the bottom, and the solid impurities A drainage separation device, wherein the drainage separated is discharged from the outflow part through the guide passage, and the outflow part of the preliminary separation tank communicates with the supply part of the separation tank.   In Claim 7, The inner side of the side wall in the said preliminary separation tank is formed circularly or squarely, The said impurity trap part formed in the taper shape which a cross section reduces toward the bottom is provided in the said bottom part. Wastewater separation device.

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