JP2007098215A - Apparatus for removing scum and its method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for removing scum capable of reducing the quantity of water flowing into a trough to efficiently carry out the inflow of only scum water into the 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 the scum water 14 containing the scum 16 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; swing dam driving means 40 for swinging the swing dam 24; image capture means 82 for capturing an image at a fixed area of the water surface around the swing dam 24 to monitor the accumulated condition of the scum 16; image processing means 84 for processing the captured image into a scum image and an image other than that; and control means 86 for controlling the swing dam driving means 40 from the result of image-processed image processing. <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

  By the way, the treated water from which the scum has been removed by the scum removing device is generally subjected to biological treatment in a subsequent process such as a biological treatment device, and the scum removing device can remove trough while efficiently removing the scum. It is important to reduce the amount of water flowing into the water as much as possible and to send a large amount of treated water to the biological treatment apparatus.

  However, the conventional timing control for flowing the scum water collected in the sedimentation basin into the trough is usually a timer control, so that the amount of water flowing into the trough cannot be reduced as much as possible to prevent the scum from flowing efficiently. There's a problem. In other words, the quality of the wastewater flowing into the sedimentation basin changes, and the amount of scum that accumulates on the surface of the sedimentation basin changes from moment to moment. Will flow into the trough. Conversely, if a large amount of scum accumulates on the surface of the water but does not flow into the trough until the scheduled time, not only does the scum accumulate, but the scum adheres to each part of the device and may cause device failure. Become.

  The present invention has been made for such a problem, and since scum water can be made to flow into the trough in accordance with the actual accumulation state of scum due to fluctuations in the quality of the wastewater flowing into the water tank, it flows into the trough. It is an object of the present invention to provide a scum removing device and method for reducing the amount of water so that only scum water can efficiently flow into the trough.

  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. An oscillating weir that stops and overflows the trough, an oscillating weir driving means that oscillates the oscillating weir, and a fixed area of the water surface in the vicinity of the oscillating weir. Imaging means for monitoring the image, image processing means for image processing the captured image into the scum image and other images, and controlling the oscillating weir driving means based on the image processing result obtained by the image processing Control means to Providing scum removing apparatus characterized by comprising.

  According to the first aspect of the present invention, a fixed area of the water surface in the vicinity of the oscillating weir is imaged by the imaging unit, and the scum accumulation is constantly monitored, and the image captured by the image processing unit is used as the scum image and the other scum image. Image processing with images. As the image processing, for example, a binarization process can be suitably employed from the difference in color between scum and water or the color density. Next, the image information subjected to the image processing is sent to the control means, and the control means controls the swing weir driving means based on the image processing result subjected to the image processing.

  By capturing the amount of scum collected on the water surface in this way, scum water can flow into the trough according to the actual scum accumulation due to the water quality fluctuation of the wastewater flowing into the aquarium. Therefore, only the scum water can efficiently flow into the trough.

  According to a second aspect of the present invention, in the first aspect of the invention, when the area ratio exceeds a set upper limit value based on an area ratio of the scum image to the entire image-processed screen, the control means The oscillating weir driving means is controlled to control the oscillating weir from the dammed state to the overflow state, and when the area ratio falls below the set lower limit value due to the overflow, the oscillating weir is returned from the overflow state to the dammed state. Control is performed.

  Claim 2 shows a preferred embodiment of the control method of the oscillating weir driving means by the control means, and sets an upper limit value and a lower limit value for setting the area ratio of the scum image to the entire image processed screen, and the area ratio When the value exceeds the set upper limit value, the oscillating weir driving means is controlled to control the oscillating weir from the dammed state to the overflow state. This prevents the scum water from flowing into the trough even though the amount of scum accumulated on the water surface is small, and the scum accumulates too much, causing bad odors and causing equipment failure. Can be prevented.

  Also, when the area ratio falls below the set lower limit value due to the overflow condition, control is performed to return from the overflow condition to the weiring condition, so that water has been accidentally poured even though the accumulated scum has almost flown into the trough. It does not flow into the trough. Accordingly, it is possible to reduce the amount of water flowing into the trough and efficiently flow only the scum water into the trough.

  Furthermore, in order to achieve the above object, the invention according to claim 3 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. A fixed area of the water surface in the vicinity of the floating oscillating weir to be imaged is imaged by an imaging unit to monitor the accumulation of the scum, and the captured image is converted into the scum image and other images by an image processing unit. Based on the area ratio of the scum image with respect to the entire image-processed screen, when the area ratio exceeds a set upper limit value, the oscillating weir driving means is controlled to remove the oscillating weir from the dammed state. And the flow state, provides a scum removal method characterized by from said overflow state Once below the area ratio set lower limit by 該越 flow back into the dammed state.

  As described above, according to the scum removing device and the method of the present invention, scum water can be flowed into the trough in accordance with the actual accumulation state of scum due to the water quality fluctuation of the wastewater flowing into the water tank. By reducing the amount of water flowing into the trough, only scum water can efficiently flow into the trough.

  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 at a trough 22 into which scum water 14 including scum 16 floating mainly on the water surface of the sedimentation basin 10 flows in, and an inflow opening 27 of scum water formed on the side wall surface of the trough 22. An oscillating weir 24 that is formed in a size substantially corresponding to the opening area and that oscillates and overflows the scum water trough 22 by oscillating vertically with its lower end as an oscillating fulcrum; The oscillating weir driving means 40 that oscillates the oscillating weir 24 and the timing controller 80 that controls the timing at which the scum water flows into the trough 22 are configured.

  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. A sealing member (for example, an O-ring or the like) is interposed between the sliding surfaces of the first side plates 31 and 31 and the second side plates 26 and 26 to improve water tightness when the swing weir 24 swings. It is preferable.

  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.

  As shown in FIG. 1, the timing controller 80 captures a certain area of the water surface in the vicinity of the oscillating weir 24 to monitor the accumulation state of the scum 16, the captured image as a scum image, and the rest An image processing unit 84 that performs image processing on an image and a control unit 86 that controls the swing weir driving unit 40 based on the image processing result subjected to the image processing are provided.

  At all times, the imaging means 82 images a certain area of the water surface near the oscillating weir 24 and monitors the accumulation of the scum 16. Then, the image picked up by the image pickup means 82 is subjected to image processing by the image processing means 84 into a scum image and other images. As the image processing, for example, a binarization process can be suitably employed from the difference in color between the scum 16 and water and the color density. Next, the image information subjected to the image processing is sent to the control means 86, and the control means 86 controls the swing weir driving means 40 based on the image processing result subjected to the image processing.

  Here, in the control means 86, the setting upper limit value and the setting lower limit value of the area ratio of the scum image with respect to the entire image-processed screen are set. Control is performed to change the oscillating weir 24 from the dammed state to the overflow state. Thereby, it is possible to prevent the scum water 14 from flowing into the trough 22 even though the amount of scum accumulated on the water surface is small, and the scum 16 accumulates too much, causing a bad odor or causing a device failure. Can be prevented.

  Further, the control means 86 performs control to return from the overflow state to the damming state when the area ratio falls below the set lower limit value due to the overflow state. Thereby, although the accumulated scum 16 has almost flowed into the trough 22, water does not flow into the trough 22 unnecessarily.

  As described above, the state of accumulation of the scum 16 that accumulates on the water surface is imaged, the captured image is image-processed, and the rocking weir 24 is driven based on the area ratio of the image-processed scum image. Since the scum water 14 can flow into the trough 22 in accordance with the actual accumulation state of the scum 16 due to the water quality fluctuation of the waste water flowing into the trough 10, the amount of water flowing into the trough 22 is reduced and only the scum water 14 is efficiently used. Thus, it can be made to flow into the trough 22.

  4 and 5 are perspective views of the oscillating weir driving means 40 in the scum removing device 20 according to the present invention, which is a means suitable for a float structure in which the oscillating weir 24 floats on water. 4 and 5, the first and second side walls, the bellows member and the like are omitted.

  The swing weir drive means 40 in FIG. 4 is supported by a hinge 42 attached to the center of the upper end of the swing weir 24 so that the lower end of the rod-shaped member 41 has a play and is rotatable. The rod-like member 41 is vertically erected with its upper end being free, and its substantially central portion is inserted into a guide tube 44 supported by the apparatus main body base 47. The guide tube 44 prevents the rod-like member 41 from falling down and allows the rod-like member 41 to move up and down smoothly. In addition, a pair of clamps 49 and 49 supported by the air plunger 46 are provided in the vicinity of the upper portion of the rod-shaped member 41. By driving the air plunger 46, the pair of clamps 49 and 49 clamps (holds) the rod-shaped member 41. Or the rod-shaped member 41 can be released. The air plunger 46 is mounted on an air cylinder 48 fixed to the apparatus main body base 47, and the air plunger 46 can be moved up and down by driving the air cylinder 48.

  According to the oscillating weir driving means 40 configured as described above, the pair of clamps 49 and 49 are normally separated from the rod-shaped member 41 (non-contact state). For this reason, the oscillating weir 24 of the float structure oscillates following the water level of the water surface of the sedimentation basin 10, and the upper end of the oscillating weir 24 is in a state of rising above the water surface, and water flows into the trough 22 Damping you. When the scum accumulates on the water surface and the scum water flows into the trough 22, the air plunger 46 is driven to clamp the rod-shaped member 41 with the pair of clamps 49, 49, and the rod 48A of the air cylinder 48 in the contracting direction. Driven to move the air plunger 46 downward by a predetermined amount. As the air plunger 46 moves downward, the rod-like member 41 clamped by the pair of clamps 49 and 49 also moves downward, so that the swing weir 24 swings downward and the upper end of the swing weir 24 is below the water surface. Die. As a result, the scum water passes over the upper end of the oscillating weir 24 and overflows into the trough 22. At this time, by adjusting the swing amount of the swing weir 24 by the swing weir driving means 40, the upper end of the swing weir 24 can be submerged by a desired distance below the surface of the water. The overflow rate can be adjusted.

  5 is supported by a hinge 42 attached to the center of the upper end of the oscillating weir 24 so that the lower end portion of the rod-like member 41 is freely rotatable. The upper end portion of the rod-like member 41 is free. In the same manner as the oscillating weir driving means 40 in FIG. 4, the vertical center and the substantially central portion are inserted into the guide tube 44 supported by the apparatus main body base 47. In the case of the oscillating weir driving means shown in FIG. 5, the rod tip 50B of the electric cylinder device 51 is disposed so as to stroke in the vertical direction slightly above the upper end of the rod-like member 41, and the rod 50A is extended. The bar-shaped member 41 is sometimes moved downward by contacting the upper end of the bar-shaped member 41.

  According to the oscillating weir driving means 40 ′ configured as described above, the rod 50 </ b> A of the electric air cylinder 50 is normally contracted and is not in contact with the upper end of the rod-shaped member 41. For this reason, the oscillating weir 24 of the float structure oscillates according to the fluctuation of the water surface of the sedimentation basin 10, and the upper end of the oscillating weir 24 protrudes from the water surface so that water flows into the trough 22. To dampen. When the scum accumulates on the water surface and the scum water flows into the trough 22, the rod 50A of the electric air cylinder 50 is extended to bring the rod tip 50B into contact with the rod-like member 41, and the rod 50A is moved downward by a predetermined amount. To stretch. As the rod 50A extends downward, the rod-like member 41 also moves downward, so that the oscillating weir 24 oscillates downward and the upper end of the oscillating weir 24 is submerged below the water surface. As a result, the scum water passes over the upper end of the oscillating weir 24 and overflows into the trough 22. At this time, by adjusting the swinging amount of the swinging weir 24 by the swinging weir driving means 40 ′, the upper end of the swinging weir 24 can be submerged by a desired distance below the surface of the water. The overflow rate can be adjusted.

  In the above description, the oscillating weir driving means 40, 40 ′ has been described with the example of the float type oscillating weir 24. However, when the oscillating weir driving means 40, 40 ′ is not float type, the oscillating dam 24 is moved up and down. Move to both. In order to move the oscillating weir 24 both up and down in the oscillating weir driving means 40 ′, it is necessary to join the rod-like member 41 and the rod 50 </ b> A using a joining member (not shown).

  Thus, by providing the oscillating weir driving means 40, 40 ', the oscillating weir 24 of the float structure moves up and down with the fluctuation of the water level of the sedimentation basin 10, so that the upper ends of the oscillating weir 24 and trough 22 are always at the water surface. When the scum is allowed to flow in, the scum water including the scum can be effectively caused to flow into the trough 22 by forcibly pushing the scum in a certain amount.

  As described above, the scum removing device 20 according to the present invention can reliably remove the scum floating on the water surface in the sedimentation basin of the water treatment facility with a simple structure.

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.

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 flow path, 31 ... first side plate, 32 ... discharge port, 34 ... guide plate, 37 ... aeration tube, 40, 40 '... rocking weir drive means, 41 ... Rod-shaped member, 42 ... Hinge, 44 ... Guide cylinder, 46 ... Air plunger, 47 ... Device body base, 48 ... Air cylinder, 49 ... Clamp, 50 ... Electric air cylinder, 80 ... Timing controller, 82 ... Imaging means, 84 ... Image processing means, 86... Control means

Claims (3)

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 weir driving means for oscillating the oscillating weir;
Imaging means for imaging a certain area of the water surface near the rocking weir and monitoring the accumulation of the scum;
Image processing means for image-processing the captured image into the scum image and other images;
And a control means for controlling the rocking weir driving means on the basis of the image processed image processing result.   Based on the area ratio of the scum image with respect to the entire image-processed screen, the control means controls the rocking weir driving means to stop the rocking weir when the area ratio exceeds a set upper limit value. 2. The scum removing device according to claim 1, wherein control is performed from a state to an overflow state, and control is performed to return from the overflow state to the damming state when the area ratio falls below a set lower limit value due to the overflow. 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. A fixed area of the water surface near the floating rocking weir that performs damming and overflowing of the scum water to the trough,
Monitor the scum accumulation by taking an image with the imaging means,
The captured image is processed by the image processing means into the scum image and other images,
Based on the area ratio of the scum image with respect to the entire image-processed screen, when the area ratio exceeds a set upper limit value, the oscillating weir driving means is controlled to change the oscillating weir from the dammed state to the overflow state,
A scum removing method, wherein when the area ratio falls below a set lower limit value due to the overflow, the overflow state is returned to the damming state.

Images