JP2010051906A - Fluid transfer device for sewage treatment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid transfer device which transfers a solid foreign matter such as screen residues removed from sewage with a fluid, and enables efficient discharge of the foreign matter such as the screen residues after being crushed. <P>SOLUTION: Water containing screen residues is made to tangentially flow into a treatment water tank 10 by an inflow pipe 12 after being crushed by a crusher 16 installed on a guide chute 14. While the water containing the crushed screen residues is rotated in the treatment water tank 10 by an agitator 22 installed in the treatment water tank 10, the flow of the water is converted to a vertical flow by guide vanes 24, 26. A discharge pipe 36 opens at an intermediate position between a set water level L and the bottom 10-1 in the treatment water tank 10. The water containing the crushed screen residues is discharged by a drainage pump 38 to be transferred to a screen residue treatment site. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fluid transfer device that fluidly transfers solid foreign matters such as screen residue removed from sewage.

Fluid transfer for sewage treatment in which slag removed from the sedimentation ground is crushed by a crushing device and then guided to a washing tank, and water in the washing tank containing the crushed residue is fluid-transferred through a fluid transfer pipe by a drainage pump. An apparatus is known (Patent Document 1). The residue removed from the sand basin is transported to the washing tank with running water trough together with water, and the washing tank has a two-part structure consisting of a primary washing section and a secondary washing section. Then, it is transported to the primary cleaning section, is subjected to the cleaning action by the cleaning water, is crushed by the crusher provided in the primary cleaning section, and is then transported to the secondary cleaning section. The secondary cleaning unit is equipped with a stirrer, and the crushed residue is agitated with the cleaning water, sucked by the externally installed transfer pump into the suction pipe that opens at the bottom of the secondary cleaning unit, and separated into screens. Only the residue is separated by a machine and transported to the treatment plant.
JP 2001-187399 A

  In the technique of Patent Document 1, the crusher is crushed by providing a crusher in the primary washing unit, then sent to the secondary washing unit, and the crusher is evenly distributed in the water by the stirrer provided in the secondary washing unit and sucked The idea is to allow efficient suction by a tube. The stirrer is provided on the wall surface of the cleaning tank, and the stirrer installed on the wall surface of the cleaning tank achieves the stirring function by the swirling flow induced in the cleaning tank. However, since the residue is lightweight, mainly made of plastic film, the buoyancy in water is relatively large relative to its weight. It is difficult to settle, and most of it continues to rotate in the water near the surface. Since the inflow of new debris continued while continuing to rotate on the surface, the debris entangled with each other and easily formed into a large lump. On the other hand, since the opening of the suction pipe is provided in the bottom surface of the washing tank, the residue after crushing does not reach the suction pipe. For this reason, the residue is not discharged, but the inflow of sewage is temporarily stopped to remove the residue from the washing tank, the liquid level of the washing tank is lowered, and suction is performed by the suction pipe installed at the bottom of the washing tank. However, in this case, a large lump of entangled mass was sucked into the suction pipe all at once, and the transfer pump might be blocked.

  The present invention has been made in view of the above problems, and an object of the present invention is to enable efficient discharge of foreign matters such as residue after crushing.

  According to this invention, the transport path for transporting the solid foreign matter separated from the sewage by the water flow, the crushing means for crushing the solid foreign matter from the transport path, and the water containing the solid foreign matter after passing through the crushing means. In a sewage treatment fluid transfer apparatus, comprising: a storage water tank to be stored; a stirring means for stirring water containing solid foreign matter in the storage water tank; and a discharge path for discharging water containing solid foreign matter after stirring; The waste water treatment fluid transfer device is provided in which the discharge path is opened to the storage tank at a position intermediate between the water surface and the bottom surface of the storage tank.

  The opening position of the discharge path with respect to the water storage tank is an intermediate position between the water surface in the water storage tank and the bottom surface of the water storage tank, in other words, a position spaced apart from the bottom surface of the water storage tank by a predetermined distance. Here, the water level in the storage tank is the water level in a normal operating state, and the water level is detected by the water level sensor, and the water flow is adjusted to a predetermined level. Solid foreign matter such as residue after crushing is forced to settle toward the bottom of the reservoir by receiving a stirring action by the stirring means. Although there is a limit, the opening position of the discharge channel is an intermediate position between the water surface of the storage tank and the bottom surface of the storage tank (a position spaced apart from the bottom surface of the storage tank by a predetermined distance). By setting the balance with the buoyancy, the sedimentation depth of solid foreign matter such as residue by stirring can be set near the opening position of the discharge path, so that solid foreign matter such as residue after crushing is substantially eliminated. Therefore, it is possible to efficiently discharge toward the discharge path without stagnation.

  The stirring means is a swirl flow generating means for generating a swirl flow in the reservoir tank, and a flow direction change for converting the swirl flow into a longitudinal flow toward the discharge port of the reservoir tank in cooperation with the swirl flow. Means. By providing a means to convert the swirl flow into the longitudinal flow, it is possible to increase the settling depth of solid foreign matters such as residue in the storage tank by agitation, so that the opening position of the discharge channel is made deeper. And the entire capacity of the storage tank can be used effectively.

  In this invention, the guide chute which connects a conveyance path and a storage water tank with a certain drop can be provided. By providing a guide chute, it is possible to obtain a smooth flow from the conveyance path to the storage tank, and it is possible to prevent problems such as blockage of the pump installed in the discharge path because the water level does not drop too much. In addition, since the guide chute simply connects the conveyance path to the water tank, the storage function is not required, so the volume of the water tank as a whole is reduced, and the apparatus is downsized and the manufacturing cost is reduced. Can do.

  This crushing means can be installed on the guide chute and can quickly crush solid foreign matters such as residue without causing an excess amount of water to stay, and can guide it to the storage tank. Can contribute to the development.

  In this invention, the reservoir tank has a circular or elliptical cross-sectional shape, and the transfer path can be opened substantially tangentially to the reservoir tank, thereby causing an efficient swiveling motion to the reservoir tank. be able to.

  Solid foreign matter such as the strength after crushing can be efficiently and quickly discharged from the discharge channel without staying in the reservoir, and the foreign matter can be removed efficiently while suppressing the volume of the reservoir. Since there is no stagnation or accumulation, problems such as blockage of a pump installed in the discharge path can be prevented.

  Hereinafter, the case where the sewage treatment fluid transfer device of the present invention is implemented in the processing of residue in a sewage treatment plant will be described as an example. The storage tank 10 is provided in the vicinity of a sand sink (not shown) in the sewage treatment plant. The residue taken out from the settling basin is sent to the storage tank 10 by the flowing water pipe 12. The water storage tank 10 has a circular (or elliptical) cross-sectional shape as shown in FIG. 2, and the water flow pipe 12 is fixed to the side surface of the water storage tank 10 so as to open in a tangential direction with respect to the internal cavity of the water storage tank 10. . The flowing water pipe 12 forms a guide chute 14 (which constitutes the conveying path of the present invention with the flowing water pipe 12) at the fixed end to the side surface of the reservoir tank 10, and flows into the flowing water pipe 12 as indicated by an arrow a. The water containing the residue is introduced into the storage tank 10 with a slight drop and stored for the stirring process.

  The guide chute 14 is provided with a crusher 16 (the crushing means of the present invention) so that the residue contained in running water from the flowing water pipe 12 is subjected to crushing action, and the crushed residue is introduced into the storage tank 10. It has become. The crusher 16 may have any structure as long as it can crush the residue, but in this embodiment, the crusher 16 conforms to the structure of Patent Document 1 and includes a pair of upright crushing units 18 and 20. Each of the upright crushing units 18 and 20 includes a plurality of cutter discs 18-1 and 20-1 spaced along the upright direction, and each of the upright crushing units 18 and 20 includes a cutter disc 18- 1, 20-1 are fixed to the respective shafts 18-2, 20-2, the rotary drive motor 21 is connected to one of the shafts 18-2, 20-2, and the shafts 18-2, 20-2 are gears. The rotation shafts of the rotary drive motor 21 are connected to each other (not shown), and the rotation of the rotary shaft of the rotary drive motor 21 is stored inward as indicated by the arrow f in FIG. Rotate toward the aquarium 10. Then, one cutter disk 18-1 or 20-1 of one upright crushing unit 18 or 20 partially makes surface contact with the adjacent cutter disk 20-1 or 18-1 of the other upright crushing unit 20 or 18. However, it has a slightly intrusive structure. Therefore, the residue transported from the flowing water pipe 12 under running water is crushed between the cutter disks 18-1 and 20-1 that are in surface contact with each other, and flows into the storage tank 10.

  The storage tank 10 is provided with stirring means for stirring water containing residue, and in this embodiment, the stirring means is a stirrer 22 (swirl flow generating means of the present invention) and guide blades 24 and 26 (this The flow direction changing means of the invention). As shown in FIG. 2, the stirrer 22 includes a rotation drive motor 27 and a stirring blade 28 connected to the rotation shaft of the rotation drive motor 27. The rotation shaft of the rotation drive motor 27 extends in the horizontal direction, and the stirring blade 28 rotates around the horizontal axis. By the rotation of the stirring blade 28, a swirling flow is formed as indicated by an arrow S in FIG. A plurality of agitators 22 for forming a swirling flow along the circumferential direction of the reservoir 10 can be installed as necessary. The installation of the agitator 22 contributes to the formation of a strong swirl flow S in the reservoir 10 in combination with the fact that the water pipe 12 opens in the tangential direction of the reservoir 10 via the guide chute 14. Can do.

  Next, the guide vanes 24 and 26 constituting the flow direction changing means of the present invention will be described. Of the guide vanes 24 and 26, the outer guide vanes 24 are arranged in the reservoir 10 as shown in FIGS. It arrange | positions along a surrounding wall surface, and the inner side guide blade | wing 26 is arrange | positioned in the center part of the water storage tank 10. FIG. The outer guide vane 24 is formed of a thin plate material, and the outer guide vane 24 is connected to the inner peripheral surface of the water storage tank 10 at one side edge in the width direction from the inner peripheral surface of the water storage tank 10 by welding or the like. Standing radially inward and fixed. And the fixing | fixed site | part of the outer side guide blade | wing 24 with respect to the inner peripheral wall of the storage tank 10 is helically displaced along the rotation direction S of a swirl | vortex flow from the top to the bottom, and the attachment part of an uppermost end and attachment of a lowermost end The part is welded and fixed over a predetermined circumferential length r along the circumferential surface of the reservoir 10 (see FIG. 2). Since the pair of outer guide vanes 24 are provided symmetrically about 180 °, any of the outer guide vanes 24 acts on the swirling flow in the rotation direction S, thereby causing the water flow in the vertical direction from above to below (arrow H in FIG. 1). Acts to convert to The height v of the outer guide vane 24 from the inner peripheral surface of the storage tank 10 is the same up to the middle, but thereafter the height is gradually lowered along the rotation direction, and h = 0 at the lowest end. (Same as the circumference). Next, the inner guide vane 26 will be described. The inner guide vane 26 is also formed of a thin plate material, and the inner guide vane 26 is helically fixed to the outer peripheral surface of the upright support column 29 in the spiral direction. Is a direction in which the fixed portion of the inner guide vane 26 with respect to the upright support column 29 is shifted in the direction of the swirling flow from top to bottom. In other words, the direction in which the spiral extends is the direction of the swirl flow S from top to bottom. Therefore, like the outer guide vane 24, the inner guide vane 26 also cooperates with the swirl flow S to achieve the function of converting the swirl flow S in the vertical direction (arrow H) from top to bottom. . Similarly to the outer guide vane 24, the height of the inner guide vane 26 is constant in the upper portion, but the vane gradually decreases from a certain height, and finally is flush with the upright column 29. (Height = 0). The upright support 29 has a lower end fixed to the bottom surface 10-1 of the reservoir 10 and an upper end fixed to the upper surface 10-2 of the reservoir 10. The stirring means of the present invention comprising the stirrer 22 as the swirl flow forming means and the guide vanes 24 and 26 as the flow direction changing means is the same as that described in JP-A-2005-155514.

  In FIG. 1, reference numeral 30 denotes a water level sensor, which is provided with known means (not shown) for injecting cleaning water according to the detected liquid level of the water tank 10 from the water level sensor 30. A mechanism for maintaining the level of the liquid level inside is provided. In the figure, the alternate long and short dash line L schematically shows the liquid level of this setting. This liquid level L is set with an appropriate drop D (FIG. 1) from the water pipe 12, and the water flow containing the residue is crushed by the crusher 16 and then does not stay, so that the storage tank 10 flows in. Even if the liquid level L rises for some reason, the screen 32 prevents the residue from circulating, and the overflow water returns to the sedimentation basin side by the pipe 34.

  The storage tank 10 has a shape in which a lower portion 10B connected to the bottom portion is narrowed through a narrowed conical portion 10A, but a discharge pipe 36 (discharge passage of the present invention) for discharging the residue is drawn from a portion to be narrowed. It is connected to the side wall surface of the upper storage tank 10. A drainage pump 38 is installed in the discharge pipe 36. The connecting portion of the discharge pipe 36 to the side wall surface of the reservoir 10 is positioned in the middle (the height h from the bottom) between the set liquid level L of the reservoir 10 and the bottom 10-1 of the reservoir 10, in other words. The water tank 10 is spaced below the set liquid level L and is spaced above the bottom surface 10-1 of the water tank 10. Functionally, the connection portion of the discharge pipe 36 to the side wall surface of the storage tank 10 is located at a portion of the depth of sinking of the residue obtained in the storage tank 10 by the swirling flow and the vertical flow in the storage tank 10. The connection part of the discharge pipe 36 is located. As a result, the residue can be discharged from the discharge pipe 36 as indicated by an arrow c without substantially retaining the residue in the storage water tank 10. The drain pipe 36 is also attached to the storage tank 10 so as to open in a tangential direction as shown in FIG. 2, so that a smooth liquid flow from the storage tank 10 to the drain pipe 36 can be obtained. . In addition, 40 is a drain pipe, one end is connected to the lower part 10B connected to the bottom part of the reservoir tank 10, and the other end is joined to the discharge pipe 36 via the valve 42 on the upstream side of the drainage pump 38. As is well known, the other end of the drain pipe 36 is located at a relatively high site as a water purification plant close to the road surface for cleaning the residue, and extends to a residue cleaning site (not shown) and crushed. The water flow containing the residue is transferred to the residue cleaning site as indicated by an arrow d. This fluid transfer and residue separation method can be performed in the same manner as that disclosed in Patent Document 1.

  The operation of the present invention will be described. The residue scraped up from the sand sink (not shown) is carried to the guide chute 14 along with the water by the flowing water pipe 12, subjected to the crushing action by the crusher 16 installed there, and crushed. The remaining residue is introduced into the reservoir 10 from the tangential direction (arrow a). The stirrer 22 installed in the water storage tank 10 forms a swirling flow in the direction of arrow S in the water storage tank 10, and the direction of this swirling flow coincides with the inflow direction in the tangential direction from the water flow pipe 12. It becomes. This swirl flow S is guided by the outer guide vane 24 fixed to the inner peripheral wall of the reservoir 10 and the inner guide vane 26 fixed to the upright support column 29 at the center. That is, since both the outer guide vane 24 and the inner guide vane 26 have a shape shifted in the rotational direction S of the swirling flow from the top to the lower part, the swirl is performed when the outer guide vane 24 and the inner guide vane 26 hit each other. The stream S is converted downward, ie in the longitudinal direction H. Such a downward vertical flow prevents foreign matter such as a residue having a small specific gravity from floating on the surface of the water, and can be evenly mixed with the residue as treated water. On the other hand, since the residue is made of a material having a small specific gravity such as a plastic film piece, the weight against the buoyancy is relatively light. There is a limit, and it stays in the part spaced apart upward from the bottom face 10-1 of the reservoir tank 10. However, in this invention, the opening part of the discharge pipe 36 is located in the part of the side wall surface of the water storage tank 10 that is spaced upward from the bottom face 10-1 of the water storage tank 10, and the discharge pipe 36 extends from the bottom face 10-1 of the water storage tank 10. The height h with respect to the opening portion is set to a position corresponding to the depth position of the residue that can sink in the reservoir 10. Therefore, the residue is efficiently sucked (arrow c) from the discharge pipe 36 and can be discharged from the discharge pump 38. That is, it is an effective measure against the problem of the prior art that light weight residue remains in the vicinity of the water surface for a long time regardless of agitation and is entangled in a lump.

  Although the drain pipe 40 is normally closed, it is used to discharge deposits on the bottom surface of the reservoir tank 10 by opening the valve 42 when the reservoir tank 10 is emptied. Since it does not stay in the storage tank 10 for a long time and does not harden into a lump, a smooth drain operation can be realized.

FIG. 1 is a schematic longitudinal sectional view of a sewage treatment fluid transfer apparatus according to the present invention. FIG. 1 is a schematic cross-sectional view of a sewage treatment fluid transfer apparatus according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Reservoir tank 12 ... Flowing water pipe 14 ... Guide chute 16 ... Crusher (crushing means)
18, 20 ... Upright crushing unit 22 ... Stirrer
24, 26 ... Guide blade 30 ... Water level sensor 36 ... Drain pipe 38 ... Drain pump 40 ... Drain pipe

Claims (5)

  A transport path for transporting solid foreign matter separated from the sewage in a water stream, a crushing means for crushing the solid foreign matter from the transport path, a reservoir tank for storing water containing the solid foreign matter after passing through the crushing means, In the sewage treatment fluid transfer apparatus, comprising: a stirring means for stirring water containing solid foreign matters in the storage tank; and a discharge passage for discharging water containing solid foreign matters after stirring. A sewage treatment fluid transfer device, wherein the storage tank is opened at a position intermediate between a water surface and a bottom surface of the water tank.   In the invention according to claim 1, the stirring means is directed to the swirling flow generating means for generating a swirling flow in the storage tank, and the swirling flow is directed to the discharge port of the storage tank by cooperating with the swirling flow. A fluid transfer device for wastewater treatment, characterized by comprising a flow direction converting means for converting into a longitudinal flow.   The sewage treatment fluid transfer apparatus according to claim 1 or 2, further comprising a guide chute that connects the transport path and the reservoir tank with a slight drop.   4. The sewage treatment fluid transfer apparatus according to claim 3, wherein the crushing means is installed on the guide chute.   The invention according to any one of claims 1 to 4, wherein the water storage tank has a circular or elliptical cross-sectional shape, and the conveyance path is substantially tangentially opened to the water storage tank. A fluid transfer device for wastewater treatment.

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