JP2007098216A - Apparatus for removing scum and its method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for removing scum capable of finely damming and overflowing scum water containing the scum to a trough, and its method. <P>SOLUTION: The apparatus 20 for removing the scum floating on the water surface of a water tank comprises: a trough 22 into which scum water 14 flows; a float type swing dam 24 provided on the inflow opening 27 of the scum water 14 formed on the side wall face of the trough 22, formed in a size roughly corresponding to an inflow opening area, and damming and overflowing the scum water 14 to the trough 22 by longitudinally swinging on its lower end part; and swing dam driving means 40 for swinging the swing dam 24, wherein the swing dam driving means 40 includes a water storage tank 84 placed above the swing dam 24, water level adjustment means 80 for adjusting the water level of the water storage tank 84, and a hydraulic cylinder 86 connecting the bottom part of the water storage tank 84 with the upper end part of the swing dam 24 so as to be freely stretched and applying the water pressure of the water storage tank 84 to the upper end part of the swing dam 24. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a scum removing device and method, and more particularly to a scum removing device and method for removing scum (floating matter) floating on a water surface of a water treatment facility, for example, a sedimentation basin.

  Conventionally, in a sedimentation basin or the like of a water treatment facility, scum has accumulated on the surface of the water, causing deterioration of treated water quality and generation of bad odor. For this reason, it is necessary to treat scum periodically. As a device for removing this scum, a pipe skimmer with a scum inlet opening in a cylindrical shape having the full length of the settling basin is used for many water treatments. Used in equipment. In the pipe skimmer, when the scum is removed, the opening rotates by a certain angle, and the opening contacts the water surface, so that scum water including scum staying on the water surface is swallowed.

  However, the scum water overflow speed to the scum inlet at the pipe skimmer is faster as it is closer to the inlet from the pipe skimmer to the skimmer water supply pipe, and is slower as it is farther away. Due to the difference in overflow speed, the scum floating on the water surface with the slower overflow speed tends to stay as it is, and the depth of penetration of the opening changes due to fluctuations in the water level, and the amount of penetration varies. As a result, scum could not be removed successfully.

In order to solve this problem, Patent Document 1 discloses a trough that opens deeper than the water surface as a scum attracting port, a weir that is arranged near the attracting port and moves up and down around the water surface, and allows liquid to flow inside. There has been proposed a floating body removing device that has a seesaw mechanism that performs a seesaw motion between a tank and a weight, and that drives the weir up and down by the seesaw mechanism.
JP 7-305325 A

  However, in the device shown in Patent Document 1, liquid is injected into a tank having a seesaw function to break the balance with the weight on the opposite side, and the liquid in the tank is allowed to flow. Since the weir is raised, it is difficult to adjust each part, and it is difficult to finely control the timing of damming and overflowing the water surface where the scum floated, and the scum cannot be discharged efficiently.

  The present invention has been made to solve such a problem, and since the swinging weir can be swung accurately with a simple structure, it is possible to prevent scum water containing the scum from damming and overflowing the trough. It is an object of the present invention to provide a scum removing device and method that can be finely performed.

  In order to achieve the above object, the invention according to claim 1 is a scum removing device for removing scum floating on the water surface of a water tank, a trough into which scum water including the scum flows, and a side wall surface of the trough. The scum water is provided in the inflow opening of the formed scum water and is formed in a size substantially corresponding to the area of the inflow opening. A float-type oscillating weir for damming and overflowing the trough, and oscillating dam driving means for oscillating the oscillating weir, the oscillating weir driving means comprising: A water storage tank disposed above, a water level adjusting means for adjusting the water level of the water storage tank, a bottom part of the water storage tank and an upper end part of the float-type oscillating weir are telescopically connected, and the storage Water that gives the tank water pressure to the upper end of the rocking weir Providing scum removing apparatus characterized by comprising a cylinder means.

  In order to achieve the above object, the invention according to claim 2 is a scum removing method for removing scum floating on the water surface of a water tank, and is formed on a side wall surface of a trough into which scum water including the scum flows. The scum water is formed in a size substantially corresponding to the opening of the scum water, and the scum water is dammed to the trough and overflowed by swinging vertically with the lower end portion as a swing fulcrum. When the upper end of the float-type oscillating weir to be connected and the water tank disposed above the upper end are connected via hydraulic cylinder means, and when the scum water is overflowed, By raising the water level and making the hydraulic pressure applied to the hydraulic cylinder larger than the buoyancy of the oscillating weir to extend the hydraulic cylinder, the oscillating weir is swung downward and submerged, Damping scum water In this case, the oscillating weir is moved upward by lowering the water level of the water storage tank and reducing the water pressure applied to the hydraulic cylinder below the buoyancy of the oscillating weir to cause the hydraulic cylinder to contract. Provided is a scum removal method characterized by swinging and floating.

  According to the present invention, the structure or material of the oscillating weir itself is a float type that floats on water, and the water pressure applied to the upper end of the oscillating weir via the hydraulic cylinder means varies by adjusting the water level of the water storage tank. I made it. As a result, if the water level of the water storage tank is lowered, the water pressure applied to the upper end of the oscillating weir becomes smaller, and the buoyancy of the oscillating weir becomes larger than the water pressure. The top of the weir comes out of the water surface.

  Also, if the water level in the water storage tank is increased, the water pressure applied to the upper end of the oscillating weir increases, and the water pressure becomes larger than the buoyancy of the oscillating weir. Sinks below the surface of the water.

  Therefore, if the relationship between the water level of the water storage tank and the rocking amount of the rocking weir in the vertical direction is grasped in advance, the rocking weir can be rocked with high precision simply by adjusting the water level of the water tank. Therefore, the damming and overflowing of the scum water including the scum to the trough can be performed finely.

  As described above, according to the scum removing apparatus and method of the present invention, the oscillating weir can be oscillated with high accuracy with a simple structure. It is possible to carry out the overflowing in detail.

  Hereinafter, preferred embodiments of the scum removing device according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view in which a scum removing device 20 according to an embodiment of the present invention is incorporated in a sedimentation basin 10. 2 is a schematic view of the scum removing device 20 as viewed from above, and FIGS. 3A and 3B are longitudinal sectional views for explaining a connecting portion between the trough and the swing weir.

  The scum removing device 20 is provided in a trough 22 into which scum water 14 including scum floating mainly on the water surface of the sedimentation basin 10 flows, and a scum water inflow opening 27 formed on a side wall surface of the trough 22. An oscillating weir 24 which is formed in a size substantially corresponding to the area and which oscillates and overflows the scum water trough 22 by oscillating vertically with its lower end as an oscillating fulcrum; Oscillating dam driving means 40 (see FIG. 5) for oscillating the oscillating weir 24.

  The trough 22 is formed to have a concave cross-sectional shape and a length direction substantially the same as the horizontal width of the settling basin 10. The scum water that has flowed into the trough 22 flows out into the discharge channel 30 through the discharge port 32 formed on the side wall surface on one side of the sedimentation basin 10.

  In addition, a pair of first side plates 31, 31 protruding in the swinging direction of the swing weir 24 from the left and right end portions of the inflow opening 27 are provided on one side wall surface of the trough 22, and the first side plate 31, A swing weir 24 is swingably supported by a hinge 23 provided at a lower portion of 31. Furthermore, a pair of second side plates 26, 26 that slide on the first side plates 31, 31 when the swing weir 24 swings are provided at both left and right ends of the swing weir 24. The second side plates 26, 26 are formed in a fan shape that requires the hinge 23. Thus, when the swing weir 24 swings, the fan-shaped gap formed between the left and right end portions of the trough 22 and the swing weir 24 can be closed. Can be prevented from flowing into the trough 22 from both left and right ends of the swing weir 24, and only the scum water overflowing from the upper end of the swing weir 24 can flow into the trough 22. Improve water tightness when the oscillating weir 24 oscillates with a seal member 26A (for example, an O-ring) interposed between the sliding surfaces of the first side plates 31 and 31 and the second side plates 26 and 26. It is preferable to do.

  In addition, on the outside of the pair of first side plates 31 and 31 and the second side plates 26 and 26, the left and right ends of the side wall surface of the trough 22 and the swing weir 24 when the swing weir 24 swings. A bellows member 28 for closing the aforementioned fan-shaped gap formed between the portions is provided. As a result, it is possible to further prevent the water in the sedimentation basin 10 from flowing into the trough 22 from the left and right ends of the rocking weir 24. Further, as shown in FIGS. 3A and 3B, the hinge 23 is covered with a cover 25 so that scum and other deposits adhere to the hinge 23 and do not hinder the swing of the swing weir 24. It is preferable.

  As can be seen from FIGS. 3A and 3B, the swing weir 24 swings around the hinge 23 as a swing fulcrum to stop and overflow the scum water to the trough 22. That is, when no scum is accumulated on the water surface of the sedimentation basin 10, the swing weir 24 is swung so that the upper end of the swing weir is higher than the water surface as shown in FIG. By doing so, the scum water 14 is prevented from flowing into the trough 22 of the scum removing device 20. On the other hand, when the scum accumulates on the water surface, the oscillating weir 24 is oscillated so that the upper end of the oscillating weir 24 is lower than the water surface, as shown in FIG. By doing so, since the scum water 14 flows into the trough 22 of the scum removing device 20, the scum floating on the water surface can be removed from the sedimentation basin 10. The scum water 14 that has flowed into the trough 22 is discharged to the outside through the discharge passage 30, and the scum is separated by an external device (not shown), and the water from which the scum has been separated is returned to the sedimentation basin 10 again.

  Further, as shown in FIGS. 1 and 2, the flow of the scum water 14 is guided from the left and right ends of the oscillating weir 24 to the center in the vicinity of the left and right ends of the oscillating weir 24 in the sedimentation basin 10. A guide plate 34 is preferably provided. This is because if the scum enters the gap between the side wall 12 of the sedimentation basin 10 and the bellows member 28 and the scum adheres to the bellows member 28, the expansion and contraction of the bellows member 28 is obstructed. It is because it will come. In the embodiment of the present invention, since the guide plate 34 is provided, it is possible to prevent scum from entering the gap between the both ends of the rocking weir 24 and the side wall 12. Furthermore, it is preferable to provide an aeration tube 37 for aerating air below the guide plate 34 (underwater). The aeration direction of the air in the aeration pipe 37 is preferably arranged so that a water flow is formed from both ends of the oscillating weir 24 toward the center. By aerating air into the water in this way, the scum gathered in the vicinity of the guide plate 34 can be driven from the both end sides of the swing weir 24 to the center side by the force of the air. And scum can be prevented from entering the gap between the wall 12 and the wall 12. Although air is supplied via an air pipe, the air used in the aeration tank in the water treatment facility can be suitably used.

  4 to 6 illustrate the structure of the rocking weir 24 in the scum removing device 20 according to the present invention and the rocking mechanism of the rocking weir drive means 40 for rocking the rocking weir 24. is there. In addition, about the member same as embodiment of FIGS. 1-3 below, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 4 to 6, the oscillating weir 24 has a float type structure that floats on water, and the tip of the rod 86 </ b> A of the hydraulic cylinder 86 is inserted into the long hole 24 </ b> A provided at the upper end of the oscillating weir 24. Part is attached. By doing in this way, the rocking weir 24 can follow the expansion / contraction operation of the rod 86A and can rock vertically.

  Further, the hydraulic cylinder 86 is connected to the water storage tank 84, receives the pressure of the water 98 accumulated in the water storage tank 84, and changes the water level of the water storage tank 84 so that the water pressure and the buoyancy of the oscillating weir of the float type structure can be reduced. Depending on the relationship, the rod 86A expands and contracts in the vertical direction. The water storage tank 84 is provided with a water level adjusting means 80 for adjusting the water level. As the water level adjusting means 80, a pipe 92 is connected to the water storage tank 84, and water 98 can be flowed to the storage tank 82 by the pump 94. Further, the water 98 in the storage tank 82 can also flow into the water storage tank 84 through the pipe 88 by the pump 90. Further, a U-shaped pipe 96 is installed in the water storage tank 84 so that the pipe is located at a position lower than the height (depth) of the water storage tank 84, and is connected to the storage tank 82. The water storage tank 84 is provided at a position higher than the swing weir 24.

  Next, with respect to the case where the scum water is prevented from flowing into the trough 22 using the oscillating weir 24 and the oscillating weir driving means 40 configured as described above, and the case where the scum water is allowed to overflow into the trough 22. explain.

  FIG. 4 shows a case where scum water is prevented from flowing into the trough 22 by damming, and the water tank 84 is filled up to the height of a. Since the water storage tank 84 is located higher than the swing weir 24, the pressure applied to the cylinder 86 can be changed by changing the water level of the water storage tank 84. If the water level is lower than a, the pressure applied to the oscillating weir 24 will be reduced, and the oscillating weir 24 will oscillate upward due to buoyancy, and its upper end will be lifted from the water surface. As the pressure applied to 24 increases, the swing weir 24 swings downward and its upper end sinks below the water surface. Although the amount of the scum water 14 in the settling basin 10 always changes, the swing of the oscillating weir 24 can be changed by changing the water level of the water storage tank 84 depending on the water level of the settling basin 10, so that the scum water 14 flows in. The upper end of the oscillating weir 24 can always be lifted from the water surface except at times. However, it is necessary to grasp the relationship between the water level of the water storage tank 84 and the amount of rocking of the rocking weir 24 in the vertical direction by preliminary experiments.

  FIG. 5 shows a case where the scum water is caused to overflow into the trough 22, and the water 98 in the storage tank 82 is sent to the water storage tank 84 through the pipe 88 by operating the pump 90. Since the water level b of the water storage tank 84 is higher than the original water level a, the rocking weir 24 receives a larger water pressure, rocks downward, and its upper end sinks below the water surface. Therefore, the scum water 14 flows into the trough 22.

  As for a series of operations of the pumps 90 and 94, when scum removal is performed periodically, it is preferable to set the pumps 90 and 94 in advance by a timer (not shown).

  Furthermore, FIG. 6 shows the case where it becomes higher than the water level b of the water storage tank 84 of FIG. If the water level becomes higher and the pressure applied from the cylinder 86 to the swing weir 24 becomes too high, the swing weir 24 will sink too much and the hinge 23 connecting the trough 22 and the swing weir 24 will be broken. . As shown in FIG. 6, by placing the highest position of the pipe 96 at the position c, when the water level is likely to exceed c due to the so-called siphon phenomenon, water 98 is sent from the pipe 96 to the storage tank 82. Therefore, it is possible to prevent the pressure applied to the rocking weir 24 from becoming too large.

  As described above, if the relationship between the water level of the water storage tank and the amount of rocking in the vertical direction of the rocking weir is known in advance, the rocking weir can be rocked accurately by simply adjusting the water level of the water tank. Therefore, it is possible to finely perform damming and overflowing of the scum water including the scum to the trough.

The perspective view of the scum removal apparatus which concerns on embodiment of this invention. Schematic which looked at the scum removal apparatus which concerns on embodiment of this invention from the upper surface. Explanatory drawing explaining the connection part of a trough and a rocking weir. The perspective view of the rocking | fluctuation weir drive means in the scum removal apparatus which concerns on this invention. The perspective view of the rocking | fluctuation weir drive means in the scum removal apparatus which concerns on this invention. The perspective view of the rocking | fluctuation weir drive means in the scum removal apparatus which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Sedimentation basin, 12 ... Wall, 14 ... Scum water, 20 ... Scum removal apparatus, 22 ... Trough, 23 ... Hinge, 24 ... Swing dam, 24A ... Long hole, 25 ... Cover, 26 ... 2nd side plate, 27 ... Inflow opening, 28 ... Bellows member, 29 ... Pin, 30 ... Discharge flow path, 31 ... First side plate, 32 ... Discharge port, 34 ... Guide plate, 37 ... Aeration pipe, 40 ... Oscillating weir driving means, 80 ... Water level adjusting means, 82 ... Reservoir, 84 ... Reservoir, 86 ... Cylinder, 86A ... Rod, 88, 92, 96 ... Piping, 90, 94 ... Pump, 98 ... Water

Claims (2)

In the scum removal device that removes scum floating on the water surface of the aquarium,
A trough into which scum water including the scum flows,
Provided in the inflow opening of the scum water formed on the side wall surface of the trough, is formed in a size substantially corresponding to the area of the inflow opening, and swings vertically with its lower end as a swing fulcrum. A float-type oscillating weir that dams and overflows the scum water to the trough,
Oscillating dam driving means for oscillating the oscillating weir,
The swing weir driving means is
A water storage tank disposed above the rocking weir;
Water level adjusting means for adjusting the water level of the water tank;
A hydraulic cylinder means for connecting the bottom of the water storage tank and the upper end of the float-type oscillating weir so as to be extendable and retractable, and for applying the water pressure of the storage tank to the upper end of the oscillating weir. A scum removing device. In the scum removal method of removing scum floating on the water surface of the aquarium,
The scum containing the scum is formed in a size substantially corresponding to the inflow opening of the scum water formed on the side wall surface of the trough into which the scum water flows and swings vertically with the lower end portion as a swing fulcrum. To connect the upper end of a float-type oscillating weir that dams and overflows the scum water to the trough, and a water storage tank disposed above the upper end via a hydraulic cylinder means. ,
When overflowing the scum water, by raising the water level of the water tank and making the water pressure applied to the hydraulic cylinder larger than the buoyancy of the oscillating weir, the hydraulic cylinder is extended, Oscillate the oscillating weir downward and submerge it,
When damming the scum water, by lowering the water level of the water storage tank and making the water pressure applied to the hydraulic cylinder smaller than the buoyancy of the oscillating weir, the hydraulic cylinder is contracted, A scum removing method, wherein the oscillating weir is oscillated upward and floated.

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