JP2006095362A - Apparatus for removing scum - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for removing scum with which the scum floating on the water surface can be removed easily by a simple structure in a sedimentation basin etc, of water treatment equipment. <P>SOLUTION: A side plate 12 is arranged in a swingable state as one side surface of a trough 11 to be installed in the sedimentation basin 1. A float 15 is fit to the side plate 12. A weight 20 for keeping the float 15 in a position below the water surface is fit to a rod 16 fit in a swingable state to the side plate 12. As a result, the upper surface of the side plate 12 can be kept in the constant position below the water surface regardless of the water level of the sedimentation basin 1 since the buoyancy of the float 15 is balanced with the weight 20. Therefore, the scum S floating on the water surface can easily be taken in the trough 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a scum removing device, and more particularly to a scum removing device that effectively removes floating matter (scum) on a water surface in a settling basin or the like of a water treatment facility.

  In a sedimentation basin or the like of a water treatment facility, suspended matter (scum) stays on the water surface, which hinders water purification treatment. For this reason, it is necessary to remove floating scum at any time. As a device for removing this scum, a pipe skimmer having a cylindrical shape with the full width of the sedimentation basin and having an open scum inlet was provided, and the scum was scraped toward the pipe skimmer inlet by a scum scraper. .

  However, the scraper plate (referred to as the flight plate) of the scum scraper cannot be brought close to the inlet of the pipe skimmer because of its structure, and can usually approach only 2 to 3 m. Further, in the case of this cylindrical pipe skimmer, since the length is long, the overflow rate of water to the scum inlet becomes faster as it is closer to the outlet of the pipe skimmer, and becomes slower on the opposite side. For this reason, there is a problem that the scum floating on the water surface with the slower overflow rate tends to stay on the water surface as it is and cannot be removed well.

In order to solve this problem, a trough that opens deeper than the surface of the water with one side as an entrance for floating objects, a weir that is placed near the entrance and moves up and down from the water surface, and allows liquid to flow inside There has been proposed a floating body removing device that includes a seesaw mechanism that performs a seesaw motion with a tank and a weight, and that drives the weir up and down by the seesaw mechanism (see, for example, Patent Document 1).
JP 7-305325 A

  However, in the apparatus described in Patent Document 1 described above, the weir is lowered by flowing the liquid into the tank of the seesaw mechanism and breaking the balance with the weight on the opposite side, and the liquid in the tank is discharged. Therefore, it is difficult to adjust each part, and it is difficult to finely control the timing of damming and overflowing the surface of the water on which the scum floats, so that the scum cannot be removed efficiently.

  This invention was made in view of such a situation, and it aims at providing the scum removal apparatus which can remove easily the scum which floats on the water surface in the sedimentation basin etc. of a water treatment facility with a simple structure. To do.

  In order to achieve the above object, the invention according to claim 1 is characterized in that a trough fixed in a sedimentation basin and having a scum floating on the water surface inflow and having an open top surface for discharging to the outside, and swingable to the trough. A side plate that forms one side surface of the trough, a float that is attached to the side plate, a rod that is swingably attached to the side plate, and that is erected upward, and is attached to the rod. And a weight that is held at a position below the water surface.

  According to the first aspect of the present invention, the side plate forming one side surface of the trough provided in the settling basin is swingably provided, the float is attached to the side plate, and the rod that is swingably attached to the side plate is attached to the rod. Since the weight for holding the float at a predetermined lower surface is attached, the upper surface of the side plate can maintain a constant lower surface regardless of the water level of the settling basin due to the balance between the buoyancy and the weight by the float. For this reason, the scum floating on the water surface can be easily taken into the trough.

  According to a second aspect of the present invention, in the first aspect of the present invention, side plate fixing means for fixing the swing position of the side plate is provided. According to the invention of claim 2, since the swinging position of the side plate is fixed by the fixing means, the side plate is not crushed when draining the water in the trough, and the life of the swinging fulcrum is long.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the trough has a discharge port, and an opening / closing means for opening and closing the discharge port is provided. . According to the invention of claim 3, since the opening and closing means are provided at the trough outlet, the water in the trough can be easily drained together with the scum.

  According to a fourth aspect of the present invention, in the first aspect of the first, second, or third aspect of the present invention, a lift means that swings the side plate upward is provided. According to the invention of claim 4, since the lift means for swinging the side plate upward is provided, the upper surface of the side plate can be protruded upward from the water surface, and the trough is drained by draining the inside of the trough in this state. The scum and water inside can be completely discharged.

  The invention described in claim 5 is characterized in that, in the invention of claim 1 or 2, a pump for discharging scum-mixed water stored in the trough to the outside is provided. According to invention of Claim 5, since it has a pump which discharges the scum mixing water stored in the trough outside, even if it is a case where it installs in the sedimentation basin of the existing water treatment equipment, By using the pipe skimmer as it is, the scum mixed water stored in the trough can be discharged into the existing pipe skimmer.

  As described above, according to the scum removing device of the present invention, the side plate forming one side surface of the trough provided in the settling basin is swingably provided, and the float is attached to the side plate so that the side plate can swing. Since the attached rod is attached with a weight that holds the float at a predetermined lower surface, the upper surface of the side plate has a constant lower surface regardless of the water level of the settling basin due to the balance between the buoyancy and the weight caused by the float. Can keep. For this reason, the scum floating on the water surface can be easily taken 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. In each figure, the same number or symbol is attached to the same member.

  FIG. 1 is a sectional view conceptually showing the scum removing device of the present invention. The scum removing device 10 has a trough 11 that allows the scum S floating on the water surface of the settling basin 1 to flow in and out. The trough 11 is made of stainless steel or resin, has a U-shaped cross section with an upper opening, and has a length that is full of the sedimentation basin 1 in the width direction.

  The trough 11 includes a trough body 11A and a side plate 12 that is a separate member from the trough body 11A that forms the upper half of one side surface (the left side surface in FIG. 1) of the U-shaped cross section. The side plate 12 is pivotally connected to the trough body 11A by a fulcrum member 13. Further, the connecting portion between the side plate 12 and the trough body 11A is covered with a rubber seal member 14, and the movement of the fulcrum member 13 is inhibited by the scum S and other foreign matters, and water leakage is prevented.

  A hollow float 15 is attached to the upper part of the side plate 12. In addition, a rod 16 is slidably connected to a central portion in the longitudinal direction of the side plate 12 via a mounting block 17 and a fulcrum member 18 and is erected upward. Further, a cradle 19 is attached to the tip of the rod 16, and a plurality of donut-shaped weights 20, 20,... Are placed on the cradle 19.

  The trough 11 is attached to a beam (or mount) 21 provided on the partition wall 2 of the sedimentation basin 1 via a beam 22 and is suspended in the sedimentation basin 1. At this time, the upper part of one surface (the right side surface in FIG. 1) opposite to the one surface to which the side plate 12 of the trough body 11A is attached is suspended so as to protrude from the water surface.

  Further, the side plate 12 is swingably connected to the trough body 11A, and receives buoyancy due to the float 15 and force in the direction of gravity due to the mass of the side plate 12, the rod 16, the weights 20, 20,. For this reason, the upper end of the side plate 12 can be adjusted to a predetermined lower surface H by adjusting the weight 20. This subsurface position H is always kept constant even if the water level of the settling basin 1 changes.

  The rod 16 is regulated in the direction perpendicular to the paper surface of FIG. 1 by a long hole 21A formed in the beam 21, and is guided in the longitudinal direction of the long hole 21A. And can be moved.

  The scum removing device 10 includes a side plate fixing means 30 that fixes the side plate 12 at a position where the side plate 12 is swung by a predetermined amount. The side plate fixing means 30 includes a rack member 31 fixed to the rod 16, a claw member 32 provided so as to be movable left and right by a guide block 34, and an air cylinder 33 fixed to the beam 21 by a holder 36. Yes.

  The guide block 34 is fixed to the holder 36 by an attachment plate 35, and the claw member 32 is attached to the shaft of the air cylinder 33 and is moved to the left and right by the operation of the air cylinder 33.

  When fixing the swing of the side plate 12, the claw member 32 pushed out by the air cylinder 33 presses the rack member 31 to push the rod 16 against the left end of the long hole 21 </ b> A formed in the beam 21. The front end of the claw member 32 engages with the rack groove of the rack member 31, and the rod 16 is fixed and the side plate 12 is fixed. Further, when the shaft of the air cylinder 33 moves backward, the fixing of the side plate 12 is released.

  The trough 11 has a drain port 11B formed at the bottom, and the scum removing device 10 has an opening / closing means 40 for opening and closing the drain port 11B. The opening / closing means 40 is composed of a rubber or resin ball plug 41 capable of closing the drain outlet 11B, an air cylinder 44 fixed to the beam 21 by a holder 45, and a roller plug 43 and a shaft of the air cylinder 44 via a roller 43. And a wire 42 for connecting the two.

  The drain port 11B is opened by retreating the shaft of the air cylinder 44, the water and the scum S in the trough 11 are discharged, and the drain port 11B is closed by advancing the shaft of the air cylinder 44. Yes.

  Further, the scum removing device 10 has a lift means 50 that swings the side plate 12 upward (in FIG. 1, swings clockwise). The lift means 50 includes a receiving plate 51 fixed to the rod 16 and an air cylinder 52 fixed to the beam 21 by a holder 53.

  The rod 16 is pushed up through the receiving plate 51 by moving the shaft of the air cylinder 52 forward, the side plate 12 is swung upward, and the side plate 12 is returned to the original by moving the shaft of the air cylinder 52 backward. Yes.

  When the side plate 12 is swung up to the maximum, the upper end of the side plate 12 can sufficiently protrude above the water surface, and in this state, the inflow of water into the trough 11 can be stopped. .

  Since the scum removing device 10 has the above-described structure, the upper end of the side plate 12 can always maintain the lower surface position H at a predetermined value regardless of the change in the water level of the settling basin 1 and float on the water surface. The scum S can be always flowed into the trough 11.

  Actually, the weight 20 is adjusted so that the lower surface position H of the upper end of the side plate 12 is about 20 mm. When the lower surface H at the upper end of the side plate 12 is about 10 mm or less, the scum S floating on the water surface hardly flows into the trough 11.

  Further, when the opening / closing means 40 is operated to discharge the water and the scum S in the trough 11, the fixing means 30 is operated to fix the side plate 12 so as not to swing. Thereby, the wobbling of the side plate 12 can be suppressed during drainage in the trough 11, damage to the fulcrum member 13 can be prevented, and the life of the trough 11 can be increased.

  Further, the lift means 50 is operated so that the upper end of the side plate 12 sufficiently protrudes above the water surface, and the opening / closing means 40 is operated in this state, so that water does not enter the trough 11, so that the water in the trough 11 All the scum S can be discharged.

  FIG. 2 is a plan view showing a state in which the scum removing device 10 according to the present invention is installed in the settling basin 1. The settling basin 1 is composed of a plurality of (three in FIG. 2) settling tanks, and the settling tanks 1A, 1B, and 1C are separated from each other by the partition wall 2, and the settling tanks 1A, 1B, and 1C are connected in series. ing.

  A scum removing device 10 is attached to each of the sedimentation tanks 1A, 1B, 1C. Each sedimentation tank 1A, 1B, 1C is provided with a scum scraper (not shown) so that the scum S floating on the water surface in the sediment layer is swept toward the scum removing device 10 by the flight plate.

  The trough 11 of each scum removing device 10 is connected to the main drain pipe 4 via each sub pipe 4A, and the water and the scum S discharged from the trough 11 of each scum removing device 10 are each sub pipe 4A. To the main drain pipe 4 and discharged to a scum pit 3 provided outside the final settling tank (in the case of FIG. 2, settling tank 1C).

  Next, the operation of the scum removing device 10 according to the present invention will be described. FIG. 3 is a flowchart for explaining the operation of the scum removing device 10. Since the upper end of the side plate 12 of the trough 11 of the scum removing device 10 is held at a position about 20 mm below the water surface of the settling basin 1, the scum S floating on the water surface is scraped toward the trough 11 by a scum scraper (not shown). Is constantly flowing into the trough 11.

  When the scum S in the trough 11 is discharged, first, the side plate fixing means 30 is operated to fix the rod 16. That is, the air cylinder 33 is operated and the rack member 31 is pressed by the claw member 32 to engage with the rack groove. Thereby, the rod 16 is fixed and the side plate 12 is fixed at a position of about 20 mm below the water surface (step S11).

  Next, the opening / closing means 40 is operated to start drainage in the trough 11. That is, the shaft of the air cylinder 44 is moved backward to raise the ball stopper 41, and the drain port 11B of the trough 11 is opened to start draining (step S12).

  Thereby, the scum S in the trough 11 is discharged together with water from the sub pipe 4A to the scum pit 3. At the same time, since the side plate 12 is at a position about 20 mm below the water surface, the scum S flows into the trough 11 one after another and is sequentially discharged. At this time, since the side plate 12 is fixed by the side plate fixing means 30, the side plate 12 is not swung by the water flow, and an excessive force is not applied to the fulcrum member 13 to which the side plate 12 is attached.

  When a time set by a timer of a control device (not shown) elapses, the shaft of the air cylinder 33 is retracted, the side plate 12 is released, the air cylinder 52 of the lift means 50 is operated, and the upper end of the side plate 12 is moved above the water surface. Then, the air cylinder 33 is operated to fix the side plate again. In this state, the side plate 12 becomes a weir and the inflow of water into the trough 11 is stopped, and when the predetermined time has elapsed, the water in the trough 11 is completely discharged (step S12).

  The predetermined time is set by a timer, and when the time is up, the opening / closing means 40 is operated to close the discharge port 11B. That is, the shaft of the air cylinder 44 is advanced, and the discharge port 11B is closed with the ball plug 41 (step S14).

  Next, the air cylinder 33 of the side plate fixing means 30 is operated to release the fixing of the rod 16 so that the side plate 12 can swing (step S15).

  Next, the shaft of the air cylinder 52 of the lift means is retracted, and the upper end of the side plate 12 is returned to the underwater position 20 mm (step S16).

  As described above, the scum S scraped by the scum scraper can be efficiently removed. The scum removing operation described above is normally performed automatically about once every hour, and the scum S floating on the water surface of the settling basin 1 is effectively removed.

  Further, in the scum removing device 10 of the present invention, since the drive sources of the side plate fixing means 30, the opening / closing means 40 of the discharge port 11B, and the lift means 50 are all using high-pressure air, no special power source is required.

  However, the driving of the side plate fixing means 30, the opening / closing means 40 of the discharge port 11B, and the lift means 50 is not limited to the air cylinder, and other known driving devices such as an electric motor may be used.

  Next, another embodiment of the scum removing device of the present invention will be described. FIG. 4 is a cross-sectional view conceptually illustrating another embodiment. In this embodiment, the scum removing device 10A is attached to the existing sedimentation basin 1, and the existing pipe skimmer 5 is fixed without rotating and used as it is as a drain pipe.

  This scum removing device 10 </ b> A has a drain tank 61 attached to the beam 21. In addition, an air lift pump 62 is provided as a pump between the trough 11 and the drain tank 61, and the drain port 11 </ b> B of the trough 11 and the air lift pump 62 are connected by a pipe 63. A pipe 64 is connected to the water tank 61. A pipe 65 is attached to the drain tank 61 toward the pipe skimmer 5.

  In the present invention, the pump is not limited to the air lift pump 62. Known lifting means such as an electric pump may be used.

  The other structure of the scum removing device 10A is the same as the structure in which the opening / closing means 40 is removed from the scum removing device 10 of the above-described embodiment, and thus the description of the other structure is omitted.

  The operation of the scum removing device 10A is as follows. First, the side plate fixing means 30 is operated to fix the rod 16. Thereby, the side plate 12 is fixed at a position of about 20 mm below the water surface.

  Next, the air lift pump 62 is operated to start drainage in the trough 11. As a result, the water and the scum S in the trough 11 are raised to the drainage tank 61 via the pipes 63 and 64 and discharged from the pipe 65 to the pipe skimmer 5.

  At the same time, since the side plate 12 is at a position about 20 mm below the water surface, the scum S flows into the trough 11 one after another and is sequentially discharged. At this time, since the side plate 12 is fixed by the side plate fixing means 30, the side plate 12 is not swung by the water flow, and an excessive force is not applied to the fulcrum member 13 to which the side plate 12 is attached.

  When a time set by a timer of a control device (not shown) elapses, the shaft of the air cylinder 33 is retracted, the side plate 12 is released, the air cylinder 52 of the lift means 50 is operated, and the upper end of the side plate 12 is moved above the water surface. Then, the air cylinder 33 is operated to fix the side plate again. In this state, the side plate 12 becomes a weir, the flow of water into the trough 11 is stopped, and the water in the trough 11 is completely discharged after a predetermined time has elapsed.

  The predetermined time is set by a timer, and when the time is up, the operation of the air lift pump 62 is stopped and the drainage from the discharge port 11B is stopped.

  Next, the air cylinder 33 of the side plate fixing means 30 is actuated to release the fixing of the rod 16 and make the side plate 12 swingable. Next, the shaft of the air cylinder 52 of the lift means is retracted, and the upper end of the side plate 12 is returned to the lower surface 20 mm.

  The above is the operation of the scum removing device 10A. Also in this embodiment, the driving sources are all high-pressure air, and the scum removing device 10A can be easily installed in the existing sedimentation basin, and the scum S can be removed effectively.

Sectional drawing showing the scum removal apparatus which concerns on embodiment of this invention Top view showing a sedimentation basin with a scum removal device The flowchart explaining the effect | action of the scum removal apparatus which concerns on embodiment of this invention. Sectional drawing showing another embodiment of the scum removal apparatus of this invention

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Sedimentation basin, 10, 10A ... Scum removal apparatus, 11 ... Trough, 11B ... Drain outlet, 12 ... Side plate, 15 ... Float, 16 ... Rod, 20 ... Weight, 30 ... Side plate fixing means, 33, 44, 52 ... Air cylinder, 40 ... Opening / closing means, 41 ... Ball stopper, 50 ... Lifting means, 62 ... Air lift pump (pump), H ... Under water surface, S ... Scum

Claims (5)

A trough with an open top surface that allows the scum, which is fixed in the sedimentation basin and floating on the water surface, to flow in and is discharged to the outside;
A side plate which is swingably provided on the trough and forms one side surface of the trough;
A float attached to the side plate;
A rod attached to the side plate so as to be swingable and standing upward;
A scum removing device comprising a weight attached to the rod and holding the float at a predetermined position below the water surface.   The scum removing device according to claim 1, further comprising side plate fixing means for fixing a swing position of the side plate.   The scum removing device according to claim 1 or 2, wherein the trough has a discharge port, and an opening / closing means for opening and closing the discharge port is provided.   The scum removing device according to any one of claims 1 to 3, further comprising lift means for swinging the side plate upward.   The scum removing device according to claim 1 or 2, further comprising a pump that discharges scum mixed water stored in the trough to the outside.

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