JP2007098212A - Apparatus and method for removing scum - 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: the trough 22 into which the scum water 14 containing the scum flows; a 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 has a mechanism of swinging the swing dam 24 by putting air in and out from the swing dam 24 forming a space inside. <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 for such a problem, and since the overflow of the overflow weir can be accurately performed with a simple structure, the damming and overflowing of the scum water including the scum to the trough can be performed. 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. Oscillating weirs for damming and overflowing the trough, and oscillating weir driving means for oscillating the oscillating weirs, and the oscillating weir driving means includes the oscillating weirs having a space formed therein. A scum removing device is provided that is a mechanism that swings the rocking weir by putting air in and out of the moving weir.

  According to the first aspect of the present invention, the oscillating weir is made to oscillate by putting air into and out of the oscillating weir having a space formed therein by the oscillating weir driving means. Thereby, the rocking weir can be rocked with a simple structure. In addition, the water treatment facility usually has an air source used for biological treatment, and this air source can be used effectively.

  A second aspect of the present invention is the first aspect of the present invention, wherein the rocking weir has a structure in which a reinforcing member for maintaining a shape is provided outside an elastic bag body, and air is supplied from the rocking driving means to the inside of the rocking weir. It swings by taking in and out and changing the buoyancy of the swing weir.

  According to claim 2, when the upper end of the oscillating weir is placed on the surface of the water and the scum water is stopped, the oscillating weir is increased by increasing the buoyancy of the oscillating weir by introducing air into the oscillating weir. Swing upward so that its upper end is lifted from the water surface. Also, when sinking the upper end of the oscillating weir below the surface of the water and allowing the scum water to flow over the trough, the oscillating weir swings downward with the weight of the oscillating weir to reduce the buoyancy by removing the air inside the oscillating weir. So that the upper end sinks below the surface of the water. In this case, by adjusting the amount of air extracted from the inside of the oscillating weir, the distance at which the upper end of the oscillating weir sinks below the water surface can be adjusted, so that the inflow amount of the scum water flowing into the trough can be accurately controlled.

  A third aspect of the present invention is the first aspect of the present invention, wherein the oscillating weir is a box structure having a U-shaped longitudinal section with a lower end opening sealed with a water surface. It swings by adjusting the pressure inside the rocking weir by taking in and out air and changing the force pushing the water surface.

  According to the third aspect of the present invention, when the upper end of the oscillating weir is placed on the water surface to stop the scum water, air is introduced into the oscillating weir to increase the pressure inside the oscillating weir. Thereby, since the force which pushes the water surface which seals a rocking | fluctuation weir lower end opening becomes large, a rocking | fluctuation weir rocks | fluctuates upward and the upper end floats from a water surface. When the upper end of the oscillating weir is submerged below the surface of the water and the scum water is allowed to flow over the trough, the air inside the oscillating weir is evacuated to reduce the pressure inside the oscillating weir. Thereby, since the force which pushes the water surface which seals rocking | fluctuation dam lower end opening becomes small, a rocking | fluctuation weir rocks | fluctuates downward and the upper end sinks under the water surface. In this case, by adjusting the pressure inside the oscillating weir, the distance that the upper end of the oscillating weir sinks below the water surface can be adjusted, so that the inflow amount of scum water flowing into the trough can be controlled with high accuracy.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the oscillating weir is provided with a distance sensor for measuring a distance between the upper end of the oscillating weir and the water surface. It is characterized by that.

  According to the fourth aspect of the present invention, the oscillating weir is provided with the distance sensor for measuring the distance between the upper end of the oscillating weir and the water surface, so that the amount of air extracted from the oscillating weir is adjusted based on the measurement result of the distance sensor. Then, the upper end of the oscillating weir can be accurately submerged below the water surface by a desired distance. Thereby, the flow rate of the scum water flowing into the trough can be controlled with high accuracy.

  Further, in order to achieve the above object, the invention according to claim 5 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 distance between the upper end of the oscillating weir and the water surface is measured by a distance sensor provided at the upper end of the float-type oscillating weir in which a space is formed inside the oscillating weir, and the scum water is overflowed When the air in the rocking weir is discharged so that the distance is within a certain range below the water surface, the rocking weir is swung downward and submerged, and the scum water is blocked. The distance is within a certain range on the water surface. The supply air within the swing weir provides a scum removal method characterized by floated by upwardly swinging the swinging dam as.

  As described above, according to the scum removing device and the method of the present invention, the overflow weir can be accurately rocked with a simple structure. It is possible to perform overflowing with great care.

  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 aeration of air into the water in this way, the scum gathered in the vicinity of the guide plate 34 can be driven from the both ends of the oscillating weir 24 to the center by the force of the air. It is possible to prevent the scum from entering the gap between the first and second members. 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 7 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 driving 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 FIG. 4, the oscillating weir 24 is a box structure having a U-shaped longitudinal section in which a lower end opening is sealed by a water surface. One end of an air hose 62 is connected to the air supply port 60 formed in the upper part of the swing weir 24 and the other end is connected to the compressor 64. A three-way valve 66 is provided in the middle of the air hose 62, and the three-way valve 66 communicates the air supply port 60 of the oscillating weir 24 and the compressor 64 to supply air into the oscillating weir 24. And a second switching for discharging the air inside the rocking weir by communicating the air supply port 60 of the rocking weir 24 with the atmosphere.

  Further, a distance sensor 68 for measuring the distance to the water surface when the oscillating weir is submerged below the water surface is provided on the top surface of the oscillating weir 24, and the data measured by the distance sensor 68 is sent to the controller 69. Sent. The controller 69 compares the set distance in which the upper end of the oscillating weir 24 is submerged in advance with the measured value measured by the distance sensor 68, and the oscillating dam 24 is supplied from the compressor 64 so that the measured value becomes the set distance. Adjust the amount of air supplied to the inside. It should be noted that the weight of the oscillating weir 24 in a state where no air is introduced needs to be heavier than water.

  Next, description will be made on the case where the scum water is prevented from flowing into the trough 22 and the case where the scum water is allowed to overflow into the trough 22 using the oscillating weir and the oscillating weir driving means 40 configured as described above. To do.

  FIG. 5A shows a case where scum water is prevented from flowing into the trough 22 by switching the three-way valve to the air supply side (first switching side), and the air from the compressor 64 is swung. Supply to the inside of the weir 24 to increase the pressure inside the rocking weir 24. Thereby, since the force which pushes the water surface which seals rocking | fluctuation dam lower end opening becomes large, the rocking | fluctuation weir 24 rock | fluctuates upwards and the upper end of the rocking | fluctuation weir 24 floats from a water surface.

  FIG. 5 (B) shows a case where the scum water is caused to overflow into the trough 22, and the three-way valve is switched to the discharge side so that the air inside the oscillating weir is discharged. Further, when the upper end of the oscillating weir 24 is submerged below the surface of the water and the scum water is allowed to flow over the trough, the three-way valve 66 is switched to the discharge side (second switching side) that discharges air from the oscillating weir 24 inside. Then, the air inside the oscillating weir 24 is removed to reduce the pressure inside the oscillating weir 24. As a result, the force pushing the water surface sealing the lower end of the swing weir is reduced, so that it swings downward by the weight of the swing weir 24 itself and the upper end of the swing weir sinks below the water surface. At this time, the distance to the water surface is measured by the distance sensor 68 provided on the rocking weir 24, and the amount of air drawn from the rocking weir 24 is adjusted so that the measured value matches the set distance. As a result, the upper end of the oscillating weir 24 can always be positioned below a certain level of water, so that the amount of scum water flowing into the trough 22 can be made constant.

  In the above case, the distance sensor 68 is provided in the oscillating weir 24 to control the distance at which the upper end of the oscillating weir 24 is submerged below the water surface. However, the distance can be controlled as shown in FIG. That is, the float 70 is provided in the trough 22 and the float 70 is connected to the movement amount measuring device 72 disposed above via the rod member 71, and the movement amount measuring device 72 floats the fluctuation amount of the water level in the trough 22. It is detected by the amount of movement of 70 vertical movement. Then, the detection result is output to the oscillating weir driving means by a signal or the like, and the oscillating weir driving means adjusts the oscillating amount of the oscillating weir so that the float 70 stops at a preset position based on the measurement signal. . Thereby, the inflow amount of the scum water 14 flowing into the trough 22 can be always controlled to be constant.

  FIG. 7 is a cross-sectional view for explaining another mode for explaining the structure of the rocking weir 24 and the rocking mechanism of the rocking weir driving means 40 for rocking the rocking weir 24.

  As shown in FIG. 7, the oscillating weir 24 has a shape-maintaining reinforcing plate 74 for maintaining the shape of the rectangular oscillating weir 24 on the outside of an elastic bag 73, for example, a rubber floating bag. This is the structure provided. One end of an air hose 62 is connected to the air supply port 60 formed in the upper part of the swing weir 24 and the other end is connected to the compressor 64. A three-way valve 66 is provided in the middle of the air hose 62, and the three-way valve 66 communicates the air supply port 60 of the oscillating weir 24 and the compressor 64 to supply air into the oscillating weir 24. And a second switching for discharging the air inside the rocking weir by communicating the air supply port 60 of the rocking weir 24 with the atmosphere.

  Although not shown in FIG. 7, the above-described distance sensor 68 and controller 69 may be provided.

  According to the embodiment of FIG. 7, when the upper end of the oscillating weir 24 is put out on the water surface to dam the scum water, air is introduced into the oscillating weir 24 to increase the buoyancy of the oscillating weir 24. As a result, the swing weir 24 swings upward so that the upper end of the swing weir 24 rises from the water surface. Further, when the upper end of the oscillating weir 24 is submerged below the surface of the water and the scum water is allowed to overflow into the trough 22, the air inside the oscillating weir 24 is evacuated to reduce the buoyancy and swing downward with the weight of the oscillating weir 24. And let it sink below the surface of the water. In this case, by adjusting the amount of air extracted from the inside of the oscillating weir, the distance at which the upper end of the oscillating weir sinks below the water surface can be adjusted, so that the inflow amount of the scum water flowing into the trough can be accurately controlled. It should be noted that the weight of the oscillating weir 24 in a state where no air is introduced needs to be heavier than water.

  FIG. 8 shows an application example in which air is used as a power source for driving the oscillating weir 24, and air is not taken into and out of the oscillating weir 24 itself, but is attached between the trough 22 and the oscillating weir 24. In this embodiment, the oscillating weir 24 is oscillated by taking air into and out of the balloon 76.

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. Explanatory drawing of the scum removal apparatus which concerns on the 1st Embodiment of this invention. Explanatory drawing of the scum removal apparatus which concerns on the 1st Embodiment of this invention. Explanatory drawing of the scum removal apparatus which concerns on the 1st Embodiment of this invention. Explanatory drawing of the scum removal apparatus which concerns on the 2nd Embodiment of this invention. Explanatory drawing of the scum removal apparatus which concerns on the 3rd Embodiment of 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 weir, 25 ... Cover, 26 ... 2nd side plate, 27 ... Inflow opening, 28 ... bellows member, 29 ... pin, 30 ... discharge channel, 31 ... first side plate, 32 ... discharge port, 34 ... guide plate, 37 ... aeration pipe, 60 ... air supply port, 62 ... air hose, 64 ... compressor , 66 ... Three-way valve, 68 ... Distance sensor, 69 ... Controller, 70 ... Floating, 72 ... Bar member, 74 ... Movement amount measuring device, 71 ... Bar member, 72 ... Movement amount measuring device, 73 ... Bag body, 74 ... Reinforcing plate, 76 ... balloon

Claims (5)

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. An oscillating weir that dams and overflows the scum water to the trough,
Oscillating dam driving means for oscillating the oscillating weir,
The scum removing device, wherein the oscillating weir driving means is a mechanism that oscillates the oscillating weir by putting air into and out of the oscillating weir having a space formed therein.   The oscillating weir has a structure in which a reinforcing member for maintaining the shape is provided on the outside of the elastic bag body, and the buoyancy of the oscillating weir is obtained by taking air into and out of the oscillating weir from the oscillating driving means. 2. The scum removing device according to claim 1, wherein the scum removing device swings by changing.   The oscillating weir is a box structure having a U-shaped vertical cross-section with a lower end sealed by a water surface, and air is taken in and out of the oscillating weir from the oscillating driving means. The scum removing device according to claim 1, wherein the scum removing device swings by adjusting an internal pressure and changing a force pushing the water surface.   The scum removing device according to any one of claims 1 to 3, wherein the oscillating weir is provided with a distance sensor for measuring a distance between an upper end of the oscillating weir and a water surface. 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 By means of a distance sensor provided at the upper end of a float-type oscillating weir that forms a space inside the oscillating weir for damming and overflowing the scum water to the trough, Measure the distance to the water surface,
When overflowing the scum water, the air in the rocking weir is discharged so that the distance is within a certain range below the water surface, the rocking weir is swung downward and submerged,
When damming the scum water, air is supplied into the oscillating weir so that the distance is within a certain range on the water surface, and the oscillating weir is oscillated upward to float. A characteristic scum removal method.

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