JP2010279859A - Fluid transferring apparatus for sewage treatment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently transfer sewage residue without causing flocculation of the sewage residue after crushing with respect to a fluid transferring apparatus for carrying out fluid transfer of the sewage residue removed from sewage. <P>SOLUTION: The sewage residue in a stream from a stream trough 10 is subjected to crushing of a first step by an inflow side crusher 12 and once is sent to an acceptance water tank 14 from an inflow port 30. The sewage residue in the acceptance water tank 14 is subjected to crushing of a second step by an outflow side crusher 16 from an outflow port 32 and then is discharged from a suction pipe 18 under suction by a discharge pump 20. The acceptance water tank 14 is constituted of a rectangular upper side box part 14a having the inflow port 30 and a conical lower side box part 14b narrowing downward and having the outflow port 32. Thereby a straight water stream can be obtained and the sewage residue subjected to crushing of the first step by the inflow side crusher 12 is sent to the outflow side crusher 16 without causing flocculation in the acceptance water tank 14 and crushing of the second step can be efficiently performed. <P>COPYRIGHT: (C)2011,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.

It is known that sediment collected from a sedimentation basin is collected and collected by a running water trough, and the running residue is crushed by a crushing device in the course of fluid transfer. In a known crushing device, a first cleaning unit is provided at the inlet, and the residue after cleaning in the first cleaning unit is finally sent to the second cleaning unit depending on the crushing device. The second washing section is equipped with a stirrer, and the residue crushed by the crushing device is agitated together with the washing water, and sucked by the discharge pump installed outside in the discharge suction pipe that opens at the bottom of the secondary washing section. Then, only the residue is separated by a screen separator and transported to the treatment plant. Further, Patent Document 2 describes separation of residue from a sand basin and conveyance by water flow.
JP 2001-187399 A JP 2004-141818 A

  The technology of Patent Document 1 is that the residue crushed by the crushing device is widely dispersed in water by the mixing action of the stirring device provided in the second washing unit, and the residue is efficiently transferred under running water by the discharge pump. It was an idea. However, in the test results by the present inventors, stirring of water containing residue with a stirrer does not necessarily contribute to uniform dispersion of residue in water, even after cutting the residue with a crushing device. Rather, it has been found that it causes another problem of causing aggregation of the residue. This is due to the following reason. In other words, the slag separated from the sand basin by the slag separator contains laces, hair, etc. in addition to vinyl fragments and pieces of cloth. Vinyl fragments are cut by the crusher. Because the hair is thin, most of it slips through the crushing device as it is. The piece of vinyl that has flowed into the second cleaning section after cutting is once broken apart, but because it is lightweight, it does not sink in the middle, but instead of stirring, the string such as hair gets entangled and aggregates into a ball shape. It becomes. Therefore, the smooth inflow to the discharge pump is hindered and the suction port of the discharge pump may be blocked.

  This invention pays attention to the problem of the prior art that the stirring in water and the dispersion of the residue is lost, and has been made to solve the problem. The purpose is to efficiently transfer the residue.

  According to the present invention, the transport path for transporting the solid foreign matter separated from the sewage under the water flow, the first crushing means for causing the solid foreign matter in the water flow from the transport path to perform the first stage crushing, and the flow A receiving water tank having an inlet and an outlet and receiving water after flowing through the first crushing means once after passing through the inlet; and a solid foreign substance in the water discharged from the outlet of the receiving water tank in the second stage A second crushing means for crushing; a discharge path for discharging the water flow after passing through the second crushing means; and a discharge means provided in the discharge path for discharging the residue under the water flow. A sewage treatment fluid transfer device is provided.

  It is preferable that the transport path, the receiving water tank, and the discharge path are arranged so that a water flow substantially along a straight line from the transport path to the discharge path through the receiving water tank is formed in a plan view. Moreover, it is preferable that the water flow is formed so as to be inclined from top to bottom from the conveyance path to the discharge path through the receiving water tank when viewed from the side. And it is preferable that the water depth of the inlet of a receiving water tank is 2 times or more of the water depth of an outlet.

  Moreover, the water supply pipe which opens in the said receiving water tank and ejects water toward the said outflow port can be provided.

  According to the present invention, solid foreign matters such as residue in the water stream are crushed by the first crushing means, and then once received in the receiving water tank. The crushed foreign substances are dispersed in the receiving water tank, and then the second It is made finer by being crushed by the crushing means and sucked and discharged by the discharge pump. Foreign matter such as residue after crushing in the first stage is once received in the receiving water tank, but then sent to the second crushing device immediately thereafter, so that the foreign matter is further finely crushed by the second crushing device without agglomeration. In addition, the water flow of foreign matters such as residue can be efficiently performed under suction.

  Further, since a water flow is formed from the conveyance path to the discharge path through the receiving water tank while being inclined in a straight line and from the top to the bottom, the foreign matter after the first stage crushing remains in a dispersed state, that is, without agglomeration. Since the second stage crushing action can be immediately received and the suction port is not blocked, the foreign matter can be transferred efficiently.

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. FIG. 3 is a cross-sectional view of the receiving water tank taken along the line III-III in FIG.

  Hereinafter, the case where the sewage treatment fluid transfer device of the present invention is implemented in the treatment of slag in a sewage treatment plant will be described as an example. A running water trough (conveyance path of the present invention) for transporting below is shown. As is well known, the sand basin is equipped with a screen for catching debris, and a conveyor with claws is provided close to the screen, and the debris caught by the screen is caught by the claws of the conveyor. It is carried out above the settling basin and dropped on the running water trough 10 to carry the residue under running water. The conveying system under running water by the running water trough of the residue taken out from the sand basin can be configured in the same manner as described in Patent Document 2 and the like.

  The residue sent under the water flow by the flowing water trough 10 is subjected to the first stage crushing by the inflow side crushing device 12 (the first crushing means of the present invention), and then once to the receiving water tank 14 via the guide chute 13. After being received and subjected to the second stage crushing from the receiving water tank 14 by the outflow side crushing device 16 (second crushing means of the present invention), the discharge pump 20 (this invention) is supplied from the suction pipe 18 (discharge path of this invention). The fluid is transferred to the unloading site under suction by the discharge means.

  The inflow side crushing device 12 may have any structure as long as it can crush solid foreign matters such as vinyl pieces contained in flowing water from the flowing water trough 10, but in this embodiment, it conforms to the structure of Patent Document 1. It is equipped with a pair of upright crushing units 22, 24, and each of the upright crushing units 22, 24 has a plurality of cutter disks 22-1, 24-1 spaced along the upright direction. The cutter disks 22-1, 24-1 constituting each of the upright crushing units 22, 24 are fixed to the respective shafts 22-2, 24-2, and the rotary drive motor 26 is one of the shafts 22-2, 24-2. And the shafts 22-2 and 24-2 are connected to each other by gears (not shown), and the rotation shaft of the rotary drive motor 26 rotates inward through the cutter disks 22-1 and 24-1. And from the running water trough 10 toward the receiving water tank 14. Then, one cutter disk 22-1 or 24-1 of one upright crushing unit 22, 24 partially makes surface contact with the adjacent cutter disk 24-1 or 22-1 of the other upright crushing unit 24, 22. However, it has a slightly intrusive structure. Therefore, the residue carried into the running water from the running water trough 10 is crushed between the cutter disks 22-1, 24-1 in surface contact.

  The receiving water tank 14 has an inlet 30 at the upper part and an outlet 32 at the lower part, and the crushed residue from the inflow side crushing device 12 is introduced into the receiving water tank 14 through the inlet 30, and the outflow side crushing apparatus from the outlet 32. 16 is leaked out. The receiving water tank 14 temporarily receives the water flow from the inlet 30 to the outlet 32 and does not intend a stirring function, but is the minimum for causing dispersion of the residue crushed by the inflow side crushing device 12. In order to smoothly guide the water flow including the residue from the inflow port 30 to the outflow port 32 without causing a substantial stop while maintaining the volume, the structure has an appropriate drop from the inlet to the outlet. . That is, the receiving water tank 14 includes a rectangular upper box portion 14a and a frustum-shaped lower box portion 14b narrowed to the lower side, and the lower box portion 14b is a rear side surface (inlet side surface) 14a of the upper box portion 14a. -1 and the surfaces 14b-1 and 14b-2 connected to both side surfaces 14a-2 form an inclined surface that narrows downward, but the front side surface 14b-3 connected to the front side surface 14a-3 of the upper box portion 14a stands upright as it is. A bottom surface 14b-4 is formed in front of the lower box portion 14b. The inflow port 30 is formed in the rear side surface (inlet side surface) 14a-1 of the upper box portion 14a of the receiving water tank 14, and receives the residue that has been crushed in the first stage by the inflow side crushing device 12, and receives the residue. The outflow port 32 is formed in the front side surface (outlet side surface) 14b-3 of the lower box portion 14b of the water tank 14, and is discharged to the outflow side crushing device 16 for crushing in the second stage. A water supply pipe 33 opens on the inlet surface (rear side surface) 14b-1 of the lower box portion 14b.

  The volume of the receiving water tank 14 is the minimum size required to disperse the residue after the first stage crushing by the inflow side crushing device 12, and therefore the retention time in the receiving water tank 14 is zero. Although the test results of the inventors etc. cannot be obtained, if the size and drop of the receiving water tank 14 are designed so that the residence time in the receiving water tank 14 is about 1 minute, the retention of the residue in the receiving water tank 14 is substantially Thus, it was found that crushing and residue were not aggregated in the receiving water tank 14.

  The outflow side crushing device 16 is composed of a pair of upright crushing units 34 and 36, and the structure of the upright crushing units 34 and 36 is the same as that of the inflow side crushing device 12, but the details are omitted. 34 (or 36) cutter disk 34-1 (or 36-1) is partly in surface contact with the adjacent cutter disk 36-1 (or 36-1) of the other upright crushing unit 36 (or 34). However, it has a structure that is somewhat intruded, so that the residue that is carried under running water is crushed between the cutter disks that are in surface contact with each other. 35. Although connection with the outflow side crushing apparatus 16 and the outflow port 32 of the lower box part 14b of the receiving water tank is desirable if possible, it is difficult to arrange, and a tapered connecting pipe 40 is disposed. The outflow side crushing device 16 is connected to the suction port 20-1 of the discharge pump 20 by the suction pipe 18 via the tapered connection pipe 42 on the outlet side.

  The discharge pump 20 provided in the suction pipe 18 transfers solid foreign matters such as residue after crushing in the second stage under suction, and may have any configuration as long as this function can be achieved. A vortex pump is preferred because of its low cost, low vibration and low noise. The discharge pump 20 includes a suction port 20-1 and a discharge port 20-2. Water containing residue is sucked from the suction port 20-1 and discharged from the discharge port 20-2. The discharge port 20-2 of the discharge pump 20 is connected to a residue cleaning site (not shown) by a delivery pipe 43. The residue washing site is located on the ground in the water treatment plant. An opening / closing valve 44 is provided at the inlet of the discharge pump 20 and an outlet valve 46 is provided at the outlet. These valves 44 and 46 are configured as an electric type or the like, and are normally in a closed state, but are opened at the time of discharge processing under the water flow of the residue.

The operation of the present invention will be described. Water containing residue is circulated from the flowing water trough 10 to the inflow side crushing device 12 through the guide chute 13, and the residue is subjected to the first stage of crushing and flows from the inlet 30. , And flows into the receiving water tank 14. Since the guide chute 13 is inclined downward, the receiving water tank 14 is positioned one step down from the flowing water trough 10, and a smooth flow from the guiding chute 13 to the receiving water tank 14 is obtained. And the receiving water tank 14 consists of the upper side box part 14a provided with the inflow port 30, and the lower side box part 14b provided with the outflow port 32, and the lower side box part 14b has surface 14b-1 by the side of the inflow port 30. Inclined so as to be squeezed toward the outlet 32 (FIG. 1), the side surface 14b-2 is squeezed downward (FIG. 3), and the lower box part 14b is squeezed forward as a whole. A smooth water flow (arrow a) from 30 to the outlet 32 is obtained, and the crushed residue that has passed through the inflow side crushing device 12 becomes free in the receiving water tank 14, so that it is once dispersed. Is done. Therefore, the residue in the receiving water tank 14 is introduced into the inflow side crushing device 12 through the connection pipe 40 by riding on the water flow from the inlet 30 toward the outlet 32 without causing any retention or aggregation. The second stage of crushing can be performed. In FIG. 1, the alternate long and short dash line L indicates the liquid level during the transporting process of the residue, and the water depth in the receiving water tank 14 is represented by h _{1 at} the inlet 30 and h ₂ at the outlet 32. It has been found that the water depth h ₁ is preferably at least twice the water depth h _{2 at} the inlet to obtain a smooth water flow due to a drop between the inlet and the outlet.

  Water is supplementarily supplied from the water supply pipe 33 that opens to the inclined surface 14b-1 on the inlet 30 side in the lower box portion 14b of the receiving water tank 14, and the water flow generated by the water supply from the water supply pipe 33 is as shown by an arrow b. Since it is discharged toward the outlet 32, the removal of the residue from the outlet 32 to the outflow side crushing device 16 is improved, and this contributes to efficient second stage crushing in the outflow side crushing device 16. Can do.

  The residue that has been crushed after the second stage is sucked together with water by the suction pipe 18 into the discharge pump 20 from the suction port 20-1, and the residue cleaning site (not shown) as shown by the arrow c from the discharge port 20-2. It is transferred under water flow for washing and separation of the residue at the residue, and the residue after separation at the residue washing site is transported by land to a treatment plant such as an incinerator. The valves 44 and 46 are opened during transfer of the residue, but are closed when the liquid level of the receiving water tank 14 falls below the limit, and the empty operation state of the discharge pump 20 is avoided.

10 ... Running water trough (conveyance path of the present invention)
12 ... Inflow side crushing device 12 (first crushing means of the present invention)
DESCRIPTION OF SYMBOLS 13 ... Guide chute 14 ... Receiving water tank 14a ... Upper side box part 14b ... Lower side box part 16 ... Outflow side crushing apparatus (2nd crushing means of this invention)
18 ... suction pipe 18 (discharge path of the present invention)
20 ... discharge pump (discharge means of the present invention)
30 ... Inlet 32 ... Outlet 33 ... Water pipe

Claims (5)

  A transport path for transporting solid foreign matter separated from sewage under a water flow, a first crushing means for causing the solid foreign matter in the water flow from the transport path to perform a first stage crushing, an inlet and an outlet The second stage crushing is performed on the receiving water tank that once receives the water flow after passing through the first crushing means after flowing in from the inlet and the solid foreign matter in the water flow discharged from the outlet of the receiving water tank. A sewage treatment fluid comprising two crushing means, a discharge path for discharging the water flow after passing through the second crushing means, and a discharge means provided in the discharge path for discharging the residue under the water flow Transfer device.   In the invention according to claim 1, the transport path, the receiving water tank, and the discharge path form a water flow substantially along a straight line from the transport path to the discharge path through the receiving water tank when viewed in plan. The sewage treatment fluid transfer device is arranged as described above.   In the invention according to claim 2, the conveyance path, the receiving water tank, and the discharge path form a water flow that is inclined from above to below from the conveyance path to the discharge path through the receiving water tank when viewed from the side. The sewage treatment fluid transfer device is arranged in such a manner.   4. The sewage treatment fluid transfer apparatus according to claim 3, wherein the water depth at the inlet of the receiving water tank is at least twice the water depth at the outlet.   5. The sewage treatment fluid transfer apparatus according to claim 1, further comprising a water supply pipe that opens into the receiving water tank and ejects water toward the outflow port. 6.

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