JP2012052406A - Separation device of discharge channel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a separation device for easily separating a turbid material contained in precipitation waste water or industrial waste water or the like inside a discharge channel.SOLUTION: For the separation device of the discharge channel, the lower edge part of a porous plate is disposed at an interval from a discharge channel bottom part inside the discharge channel, a sheathing board is provided on the discharge channel bottom part on the downstream side of the porous plate, and flexible plates are disposed at an interval between the porous plate and the sheathing board.

Description

The present invention relates to a separation device for a water discharge channel provided for separating suspended substances such as oil and floating substances such as precipitation drainage and industrial wastewater.

Conventionally, rainfall drainage, industrial drainage, etc. from land have been discharged into rivers, lakes, harbors, oceans and the like. In particular, in the case of harbors, the back of the bay hits the bottom of a coral with a large city behind, and there is little seawater exchange. The drainage from the river flows into this area, and it becomes a suspended substance directly and continuously, and the environmental pollution of the harbor is accumulated every day. In addition, there are even greater risks due to the entry and departure of more ships and spills of cargo chemicals and heavy oil. In large city ports, terrestrial pollution sources are concentrated, and this environmental conservation is not done at all.

An oil fence and a screen are generally provided in a water discharge channel at the extreme end of sewage or industrial waste water in order to remove suspended substances. In this drainage channel, the water level in the drainage channel always changes due to the amount of discharged drainage and the water level of the river. In order to respond to changes in the water level in the water discharge channel, the conventional oil fence is provided with slide bars on both wall surfaces of the water discharge channel, and the ring fittings provided at both ends of the oil fence are moved up and down on the slide bar. It was installed as possible.
However, if the amount of drainage increases and the water speed increases, pressure is applied to the surface of the oil fence suddenly, so the slide function does not work and the water level cannot be changed, and the oil fence is fixed and can follow the water level. The fence effect does not work. As a result, the drainage overflowed the upper part of the oil fence, and the membrane fence became in equilibrium with the water flow, and the suspended material was discharged to the river and the harbor without being processed without performing the fence function.

Therefore, the present inventor has completed the present invention as a result of various studies on an apparatus that can stably separate suspended solids in wastewater even when the water level in the discharge channel is at the bottom water level or at a high water level. It came to do.

The present invention is not an oil fence type that fluctuates in the water level of the water discharge channel as in the prior art, and a porous plate is provided over the entire width of the water discharge channel and a plurality of flexible plates are installed in a fixed or semi-fixed state. The reaction force is always applied, and the rise (separation) of suspended substances such as oil and suspended solids can be promoted by the suppression effect, and can be held in the upper quiet area.
In particular, by making the lower part of the flexible plate unfixed, the lower part of the flexible plate is deformed backwardly by the fluid pressure, so that the cross-sectional area of the water flow can be increased, and thereby the vortex A stream can be generated in the upward direction.

The present invention makes it easy to separate the oil and suspended solids in the drainage by making the water trickle with the flow of running water and generating bubbles, and the both sides of the flexible plate are fixed or partly fixed. Therefore, a reaction force is always applied to the flowing water pressure to promote the rise of suspended solids, and when the flexible plate is deformed to be bent backward by the flowing pressure, the water flow is interrupted. Since the area is enlarged and the vortex street flow can be generated in the upward direction, the suspended matter in the waste water can be effectively separated.
Further, the present invention provides a dam plate 13 movable up and down in the vicinity of the dam plate 12 to adjust the position of the movable dam plate 13 with a small amount of water and normally even when the water level in the water discharge channel is low. The water level in the water discharge can be raised.
Furthermore, even when the amount of water is large and the flow of flowing water is strong and the flow is fast, adjusting the position of the movable weir plate 13 raises the water level in the discharge channel, weakening the water flow without causing overflow. A stagnant region with a slow flow occurs between the flexible plates, and the effect of capturing suspended substances such as oil and suspended solids can be promoted, so that the function of the separation apparatus of the present invention can be fully utilized.

Plan view of the separation device provided in the discharge channel Front view of perforated plate AA longitudinal sectional view showing a state in which the perforated plate is fixed to the side wall surface of the water discharge channel Front view showing a state where a perforated plate is installed in the water discharge channel Longitudinal section showing the state where the flexible plate is fixedly installed on the side wall surface of the water discharge channel Schematic longitudinal sectional view of the separation device of the present invention State diagram showing flow of water flow accompanying deformation of flexible plate 9 State diagram showing the flow of water flow occurring in the vicinity of the flexible plates 7 and 8

Next, the present invention will be described with reference to the drawings, but the present invention is not limited to the following description.
FIG. 1 is a plan view of a water discharge channel T according to the present invention. The perforated plate 1 shown in FIG. 2 is fitted to the width of the water discharge channel, and both side edges of the porous plate 1 are fixed to the side wall of the water discharge channel. As shown in FIG. 3, the perforated plate 1 is fixed in a sandwich shape by providing an L-shaped fastener 2 on one side edge of the perforated plate and a plate-like fastener 2 'on the opposite side. For example, a fixing tool 4 such as a bolt and nut is sandwiched, and then a gap is provided between the lower edge of the perforated plate 1 and the bottom of the water discharge channel, and the other side of the L-shape of the fixing device 4 is connected to the water discharge channel. It is fixedly installed on the side wall surface 3 with a fixture 5. FIG. 4 is a longitudinal sectional view when the perforated plate 1 is installed as viewed from the flow direction of the drainage.
The interval between the lower edge of the perforated plate 1 and the bottom of the water discharge channel is provided in order to prevent solids such as dust and sludge from accumulating on the upstream side of the perforated plate 1. It is desirable to provide the lower edge portion of the perforated plate 1 so as not to be immersed in running water.
Further, the position, number and size of the holes 6 of the perforated plate 1 can be appropriately selected depending on the kind of drainage flowing in the water discharge channel. The material of the porous plate 1 can also be a flexible plate such as a rubber plate.
Although this perforated plate is not always necessary, by installing it, it is possible to make it easier to separate oil and suspended solids in the wastewater by generating a bubble by trickling with flowing water.

Next, the flexible plate 7 is installed on the downstream side of the porous plate 1. As in the case of the perforated plate 1, the installation method is to fix both side edges of the flexible plate 7 to the side wall surface 3 of the water discharge channel with the L-shaped fastener 2 and the flat plate-like fastener 2 ′.
At this time, as shown in FIG. 5, it is preferable that the flexible plate 7 is not fixed at the lower portions of both side edges but only at the upper portion. The portion to be fixed is fixed at least between the upper part of the flexible plate 7 and the intermediate position (1/2 of the length of the flexible plate) with respect to the depth direction of the water discharge channel (vertical direction of the flexible plate). Preferably, the fixing portion may be appropriately determined in consideration of the water flow and the like.

Further, as shown in FIG. 1, the flexible plate 8, the flexible plate 9, and the flexible plate 10 are sequentially fixed and installed on the downstream side of the flexible plate 7 in the same manner as the flexible plate 7.
Although FIG. 1 shows a case where four flexible plates are fixedly installed, this number may be determined in consideration of the type of drainage, the flow rate, the amount of water, and the like. Furthermore, depending on the installation of the dam plate 13 movable up and down, the flexible plate can be reduced to, for example, three and installed.
The length of the flexible plate in the vertical direction is preferably ¼ to ¾ of the height of the maximum water level of the water discharge channel.
A dust removing screen 11 is stretched on the downstream side of the most downstream flexible plate provided in an arbitrary number. The lower edge of the dust removal screen 11 is preferably located at the bottom of the water discharge channel, while the upper edge is preferably stretched to a position higher than the maximum water level of the water discharge channel.

A dam plate 12 is provided on the downstream side of the dust removal screen 11 in order to maintain a constant water depth at the bottom of the water discharge channel T. It is preferable that the lower edge portion of the weir plate 12 is located at the bottom portion of the water discharge channel, and the upper edge portion has a height that secures the minimum water level of the water discharge channel.
Further, even when the amount of water is small and the water level in the discharge channel is low, as a method of fully utilizing the ability of the separation device of the present invention, it can be moved up and down by electric or manual winding, for example, at a position directly above the weir plate 12. It is preferable to provide the weir plate 13. That is, when the amount of water is small, the water level in the discharge channel of the separation device can be raised by lowering the movable weir plate 13 and narrowing the distance between the weir plate 12 and the movable weir plate 13. The function of the flexible plate provided in the water channel can be utilized to the maximum extent. Further, when the movable dam plate 13 is provided, the dam plate 12 may be omitted.
Further, the position where the movable dam plate 13 is attached can be provided not only directly above the dam plate 12 but also at any position before and after (upstream or downstream) of the dam plate 12. When the movable dam plate 13 is attached, a movable dam plate 13 guide portion is provided on the side wall surface of the water discharge channel, and the movable dam plate 13 guide portion is fixed to the side wall surface 3 of the water discharge channel. It is preferable to fix and install with a tool and to move without being influenced by the flow velocity.
Further, when the movable weir plate 13 is attached to the dust removing screen 11, it is provided on the upstream side of the dust removing screen 11 along with the dust removing screen 11, so that the movable weir plate 13 can be used. The guide portion can be omitted.

As a material for the flexible plates 7, 8, 9, and 10, a rubber plate, a cored rubber plate, a soft synthetic resin, or the like is used. For example, in the case of a rubber plate or the like, a used belt gon bear can be shaped into an appropriate size and used. It is preferable to use a flexible plate having a thickness in the range of 0.5 to 20 cm in consideration of water flow and the like. Further, the material of the fixed portion and the non-fixed portion of the flexible plate may be changed, or the thickness may be changed.

Next, installation positions of the perforated plate 1 and the flexible plates 7, 8, 9, 10 will be described.
FIG. 6 shows an example of the arrangement positions of the perforated plate 1 and the flexible plate, and is not limited to the following arrangement positions.
FIG. 6 illustrates a water discharge channel having a width of 1200 mm and a water depth of 1200 mm as an example.
First, the perforated plate 1 is arranged with a width of 1200 mm and a length of 350 mm facing downward from the middle part of the water depth of the water discharge channel (between water depths of 300 to 650 mm), and both side edges of the perforated plate 1 are fixed to the side wall surface of the water discharge channel. To do. Next, a flexible plate (width 1250 mm, length 400 mm) 7 is provided on the downstream side of the porous plate 1 by about 750 mm. When both edge portions of the flexible plate 7 are fixed to the side wall surface of the water discharge channel, about 1/4 of the upper portion is fixed, and the remaining 3/4 portion is installed without fixing. The installation position of the flexible plate 7 is preferably installed in a state where the upper edge of the flexible plate 7 protrudes from the maximum water level. Next, a flexible plate (width 1210 mm, length 500 mm) 8 is provided downstream of the flexible plate 7 by about 750 mm. As with the flexible plate 7, the flexible plate 8 is installed such that the upper edge of the flexible plate 8 protrudes from the maximum water level, and both side edges of the flexible plate 8 extend from the upper edge. Only 1/5 part is fixed to the side wall surface of the water discharge channel, and the lower 4/5 part is not fixed.

Further, a flexible plate (width 1210 mm, length 300 mm) 9 is provided about 400 mm downstream from the flexible plate 8. The flexible plate 9 is installed at a position where the upper edge of the flexible plate 9 is about 100 mm below the normal water level, and both side edges are only about 1/3 of the upper edge. Fix to the side wall of the spillway.
Next, a flexible plate (width 1210 mm, length 400 mm) 10 is provided by fixing about a quarter of the upper edge from the flexible plate 9 on the downstream side of the flexible plate 9 on the side wall surface of the water discharge channel. The flexible plate 10 is installed such that the lower edge of the flexible plate 10 is immersed in the water flow when the water level is at the minimum.
A case where the movable dam plate 13 is attached to a position directly above the dam plate 12 will be described. By providing the lower edge of the movable barrier plate (width 1180 mm, length 1200 mm) 13 so that it is immersed from the normal water level, the water level of the discharge channel T rises to a level higher than the normal water level in normal drainage. Thus, oil, suspended matter, and the like can be trapped by stagnating on the upstream side of the flexible plate 7 and the flexible plate 8.

In the present invention, there are various methods for arranging the plurality of flexible plates, but generally, the downstream flexible plate adjacent to the lower edge of the upstream flexible plate in terms of height. It is preferable to arrange in a state where the upper edge portion is wrapped in the height direction.
And when multiple flexible plates are installed, it is installed so that the range from the minimum water level to the maximum water level in the drainage channel area is blocked by the flexible plate when viewed from the water flow direction (perforated plate side) It is preferable to do.
In short, the vertical arrangement position of the flexible plate provided in the present invention is between the minimum water level and the maximum water level with a gap between the shielding surfaces formed of a plurality of flexible plates as viewed from the porous plate 1 side. It is preferable to provide it so that there is no.
In addition, the number and length of flexible plates can be selected appropriately depending on the water quality, amount of water, the speed of water flow, the level of water, etc., and the length of the upper part that is fixed to the side wall surface of the water discharge channel at both side edges of the flexible plate. do it.

Next, a method for treating wastewater by the drainage separation device shown in FIG. 6 will be described.
When the amount of drained water is small, the weir plate 12 is provided at the final part of the separation device, so that the water level is at least as high as the weir plate 12. Also, the water level can be secured by providing the movable weir plate 13. When drainage flows at the minimum water level, the flow rate is slow, so that oil or the like in the drainage floats and flows on the water surface while passing through the separator, and is collected by being blocked by the final flexible plate 10. The collected suspended matter is removed using an appropriate means.

In addition, when drainage is flowing at a normal water level, turbulent flow is generated in the water flow by the perforated plate 1, and bubbles are taken into the drainage, and oil or the like adheres to the bubbles and floats on the water surface as floss. To do. The floss that floats is collected on the front surface of the flexible plate 7 and the front surface portion of the flexible plate 8. These flosses are removed using appropriate means such as suction.
When the water level is normal, there is a certain level of water speed, so the flexible plates 9 and 10 provided below the water discharge channel are not fixed at the lower part so that they receive resistance and the lower part is indicated by a virtual line. It comes to bend in a curved shape. In such a state, as shown in FIG. 7, a spiral flow is generated on the back surface of the flexible plate 9, and suspended substances such as oil can be flossed and floated. Further, the flexible plate 10 can promote flossing in the same manner as the flexible plate 9. Waste etc. in the drainage is removed and collected by a final dust removal screen.

  When drainage flows at the maximum water level, in addition to the effects of the flexible plates 9 and 10, the back surface (downstream side) portion of the flexible plate 7 and the front surface portion (upstream) of the flexible plate 8 as shown in FIG. As shown in the figure, a vortex and a reverse flow as shown in the figure occur, and suspended substances such as oil can be flossed.

T ·························································································· ... Flexible plate 11 ... Screen 12 ... Dam plate 13 ... Movable barrier plate

Claims (2)

A plurality of flexible plates are arranged at intervals in the water discharge channel, and all or both upper side edges of the flexible plate are fixed to the side edge surface of the water discharge channel and are flexible. An apparatus for separating a water discharge channel, characterized in that the lower edge of the flexible plate closest to the bottom is installed so that the lower edge of the flexible plate is immersed in a water flow when the water level is at a minimum. The separation apparatus for a water discharge channel according to claim 1, wherein a porous plate is provided with a space in front of the flexible plate provided in the front row.

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