JP2005334792A - Screen residue transfer system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen residue transfer system which enables an efficiency improvement of screen residue transfer and sanitization, and downsizing of an installation space and reduction in an installation cost and a running cost by surely crushing added screen residues and effectively washing the screen residues. <P>SOLUTION: This screen residue transfer system comprises a crushing means 2 for crushing the added screen residues, a carrier means 3 for carrying the screen residues crushed by the crushing means 2, a storage means 4 for washing, and mixing and agitating the screen residues carried by the carrier means 3, and a transfer means 5 installed outside of the storage means 4 for transferring the screen residues in the storage means 4 to the outside of the storage means 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In particular, the present invention relates to a sieve transfer system suitable for transferring a sieve scraped up at a sewage pump station or a sewage treatment plant.

  In sewage pump stations and sewage treatment plants, wastes such as plastics, hair, leaves, wooden pieces, and scum in inflow raw water are removed in advance with a dust remover and sent to the treatment process. The separated material swept up by the dust remover or the like is called sieve residue.

  Conventionally, the sieves separated by the dust remover etc. have been transported horizontally and vertically by case conveyors, belt conveyors, etc. to the place where the sieve storage facilities are located, but a large space is required for conveyor installation. In addition, there are problems that moisture scatters around the conveyor and that the odor is scattered outside because the conveyor is difficult to seal.

On the other hand, for example, JP 2001-187399 A (Patent Document 1)
A flowing water trough for transporting the screen residue collected at a sewage treatment plant etc. (agreement with the “sieve residue”) to the treatment tank, a treatment tank for crushing and washing the screen residue, and the outside of the treatment tank A screen residue processing system including a transfer pump, a transfer pipe, and a screen residue separator is described. Here, the processing tank is provided with a primary cleaning section, a crushing section, and a secondary cleaning section in an integrated tank, and receives the screen residue recovered from the sewage treatment plant to crush and clean the screen residue. Is what you do. In Patent Document 1, a disc type screen is provided beside the crushing part, and thereby the sieve put in the primary cleaning part is more smoothly guided to the crushing part. Is also shown.

In Patent Document 1, it is assumed that the screen residue collected at a sewage treatment plant or the like can be reliably crushed and washed by a compact facility and further sanitized by adopting such a configuration. Yes.
JP 2001-187399 A

  However, the screen residue processing system described in Patent Document 1 has the following problems.

  (1) In the processing tank of the said processing system, the crushing part is installed vertically in the center part which bisects a processing tank. Therefore, the screen residue carried from the running water trough to the primary cleaning part of the treatment tank cannot smoothly reach the tuyere of the crushing part, and the screen residue becomes a dumpling-like lump in the treatment tank. It tends to sink or remain floating, and the screen residue is not efficiently crushed. On the other hand, in Patent Document 1, a water supply nozzle is provided at the bottom of the primary cleaning unit, and the washing water sprayed from the nozzle prevents sedimentation of the screen residue, and further directs the screen residue toward the crushing unit. The method of transport is shown. However, in the method of injecting the washing water from the water supply nozzle provided at the bottom of the treatment tank, a certain amount of transfer effect is recognized for the screen residue settled on the bottom, but the transfer effect for the screen residue in the floating state is It is extremely low and there are doubts about improving the crushing effect.

  (2) In the treatment tank of the treatment system, the propulsive force for transferring the screen residue to the tuyeres of the crushing unit depends only on the flow of water as described above. Inefficient in terms of sending to the tuyere. Further, in Patent Document 1, a disk-type screen is provided beside the crushing part, and thereby the sieve put in the primary cleaning part is more smoothly guided to the crushing part. However, there is no ability to force the screen residue to be sent to the tuyeres of the crushing part. Has occurred.

  (3) In the above processing system, since the screen residue is crushed and washed in the integrated processing tank, the water in the processing tank is likely to be contaminated by organic matter such as feces that are carried along with the screen residue. The cleaning effect of the screen residue transferred from the treatment tank is not sufficient.

  (4) In the above processing system, it is necessary to divide the processing tank into a primary cleaning section, a crushing section, and a secondary cleaning section, and the tank is enlarged and requires a large installation space. It is difficult to install in a pond.

  The present invention has been made in order to solve the above-mentioned problems, and it is possible to improve the efficiency and sanitization of the transfer of the sieve by reliably crushing the supplied sieve and effectively cleaning the sieve. Furthermore, it aims at providing the sieve transfer system which can aim at size reduction of installation space, reduction of installation cost, and running cost.

The above problems are solved by the following invention.
[1] Crushing means for crushing the charged sieve,
Conveying means for conveying the sieve crushed by the crushing means;
A storage means for washing and mixing and stirring the sieve transported by the transport means;
A sieve transfer system comprising a transfer means provided outside the storage means for transferring the sieve residue in the storage means to the outside of the storage means.
[2] The sieve transfer system according to [1], wherein the conveying means has a function for cleaning the sieve.
[3] The sieve transfer system according to [1] or [2], wherein the transfer means is a non-occlusive pump.

  According to the present invention, the introduced sieve is reliably crushed and the sieve is effectively washed, thereby improving the efficiency and sanitization of the transfer of the sieve, and further reducing the installation space of the system. A sieve transfer system that can reduce the cost, installation cost, and running cost is provided.

  Hereinafter, an example of the best mode for carrying out the present invention will be described.

  FIG. 1 is a schematic configuration diagram showing an embodiment of a sieve transfer system according to the present invention. 1A is a side view, and FIG. 1B is a plan view.

  The sieve residue separated and removed by a dust remover or the like at a sewage pumping station, a sewage treatment plant or the like is introduced into the crushing means 2 by the sieve supply means 1 as shown in FIG. In this crushing means 2, the supplied sieve residue is crushed. The sieve residue crushed by the crushing means 2 is conveyed by the conveying means 3 and put into the storage means 4. The sieve cake put into the storage means 4 is washed and mixed and stirred in the storage means 4. The sieve residue washed in the storage means 4 is mixed with agitation with water in the storage means 4 to be slurried. The slurry in the slurry storage means 4 is discharged from a sieve discharge port provided in the storage means 4 by a transfer means 5 provided outside the storage means 4. The slurried sieve residue discharged by the transfer means 5 passes through the pipe 6 connected to the discharge side of the transfer means 5 and is transferred to, for example, a sieve storage facility.

  Hereinafter, each configuration of the sieve transfer system will be described in more detail.

  A running water trough can be used as the sieve supply means 1 provided in the preceding stage of the crushing means 2. Since the flowing water trough can be transported without splashing the sieve residue, it is excellent for hygienically transferring the sieve residue.

  When a running water trough is used as the sieve supply means 1, an overflow weir 11 is provided at the outlet of the running water trough 1, that is, in the vicinity of the connection portion with the crushing means 2, and the overflow water is received by the overflow box 12. Then, it is preferable to guide the dust through the bypass line 13 to the upstream side of a dust remover (not shown) that separates and removes the sieve residue. As a result, the crushing means 2 provided at the subsequent stage of the flowing water trough 1 breaks down, and the sieve cannot be processed. Even when the flowing water cannot pass through the crushing means 2 and the water level rises, the sieve is removed from the flowing water trough 1. There is no overflow and it is possible to prevent environmental pollution caused by the overflow of the sieve residue. A liquid level gauge 14 may be provided in the vicinity of the overflow weir 11 at the outlet of the flowing water trough 1. As a result, when the crushing means 2 is blocked by the sieve, the flowing water from the flowing water trough 1 cannot pass through the crushing means 2 in its entirety, and the water level of the overflow box 12 rises. It becomes possible to detect.

  As the crushing means 2, for example, a biaxial rotary crusher can be used. More specifically, two sets of crushing units 22 in which a plurality of disc-shaped cutters are fixed on a rotating shaft are arranged so that the disc-shaped cutters of the crushing units 22 overlap each other. A disc type crusher configured to be driven can be used.

  In the present invention, the sieve put in the crushing means 2 by the sieve supply means 1 is reliably crushed by the crushing means 2. Therefore, as seen in the prior art, the lump of the sieve residue may sink to the bottom and remain without being crushed, or the light sieve residue such as polystyrene foam or balls floating on the water surface may remain without being crushed. And all sieve residue is reliably crushed.

  As the transport means 3, for example, a screw conveyor 3 can be used. As the screw conveyor 3, one provided with a spiral screw 31 around the center shaft or a ribbon type having no center shaft can be used. The screw 31 is driven by a driving device 36.

  Here, it is preferable that the transport unit 3 has a function for cleaning the sieve passing through the transport unit 3. By cleaning the sieve as the primary cleaning during the transfer of the sieve by the transfer means 3, the cleanliness of the sieve put into the storage means 4 in the subsequent stage can be further improved, and hygiene Sex is improved more. This makes it possible to more efficiently perform cleaning and mixing and stirring of the sieve residue in the storage means 4 at the subsequent stage. Furthermore, since the organic matter such as feces in the sieve can be removed by the primary cleaning, the volume of the sieve can be greatly reduced.

  As a function for cleaning the sieve, for example, when a screw conveyor is used, a cleaning nozzle 32 is provided inside the trough of the screw conveyor 3, and cleaning water can be sprayed from the cleaning nozzle to the sieve in the middle of conveyance. This can be done. Here, in order to more effectively clean the sieve, it is preferable to provide a plurality of the cleaning nozzles 32 so that the spray directions of the cleaning water are different from each other and spray the screw onto the screw conveyor 3. The flow rate and pressure of the cleaning water may be adjusted by a cleaning water adjustment valve provided in the middle of the cleaning water supply pipe for supplying the cleaning water to the cleaning nozzle 32. A drain pan 34 is installed below the transport means 3 via a drain screen 33, and moisture and washing drain in the sieve are discharged from a drain pipe 35 provided in the drain pan 34. , Sent to a sand basin or wastewater treatment facility.

  Further, it is preferable that the transport means 3 has a dehydrating function. Thereby, since the organic content contained in the crushed sieve is discharged together with the desorbed liquid, the sieve supplied to the storage means 4 in the subsequent stage can be made more sanitary.

  In addition, as a method of giving the dehydration function, for example, a method of inclining the conveying means 3 so that the sieve discharge port is upward, a method of reducing the cross-sectional area in the vicinity of the sieve discharge port and narrowing the diameter, or A method of discharging by lifting the tube shape of the discharge part of the sieve residue into an S shape or an inverted U shape can be used. Furthermore, when a screw conveyor is used, it is possible to provide a dehydrating function by making the pitch of the screw closer to the discharge port.

  In the storage unit 4, the sieve transported by the transport unit 3 is washed and mixed and stirred. The storage means 4 is preferably provided with a stirrer 41 or a water injection nozzle 42 or both of the stirrer 41 and the water injection nozzle 42 in order to efficiently perform washing and mixing and stirring of the sieve residue in the tank. . Further, the storage means 4 is provided with a liquid level gauge 43 and a drain port 44. When the amount of water in the storage means 4 exceeds a predetermined amount, the reservoir means 4 drains from the previous period drain port 44, It is preferable to prevent overflow of the sieve residue (overflow). The drainage from the drainage outlet includes crushed fine sieve residue and organic components remaining without being washed by the screw conveyor 3. Therefore, it is preferable to return the drainage from the drainage port to, for example, a sand basin provided in a sewage pumping station or a sewage treatment plant.

  In addition, as shown in FIG. 1, the storage means 4 has a tank shape that is inclined at the bottom of the rectangular tank so that the sieve can be efficiently discharged. It is preferable to provide a sieve outlet 45 for discharging the sieve. In this case, it is preferable that the entrance position of the sieve from the conveying means 3 and the installation position of the stirrer 41 and the water injection nozzle 42 are provided upstream of the sieve discharge port 45. As a result, the effect of washing and mixing and stirring the sieve in the storage means 4 can be further enhanced, the sieve becomes a slurry state in the storage means 4, and the discharge of the sieve from the storage means 4 is more effective. Can be performed.

  The shape of the storage means 4 is not limited to the rectangle shown in FIG. 1 and may be a cylindrical shape. In this case, for example, the bottom of the cylindrical tank may have an inverted conical shape, and a sieve outlet 45 may be provided at the apex (deepest part). Moreover, it is preferable to adjust a water flow direction so that the said stirrer 41 or the water injection nozzle 42 or both the stirrer 41 and the water injection nozzle 42 may produce a vortex flow in a tank. Thereby, it becomes possible to further enhance the cleaning effect of the sieve in the storage means 4 and the mixing and stirring effect.

  In the present invention, only the sieve residue crushed by the crushing means 2 is put into the storage means 4, so that the cleaning effect of the sieve in the storage means 4 and the mixing and stirring effect are excellent, and the hygiene of the sieve is greatly improved. Can be improved. Furthermore, since organic components contained in the sieve can be efficiently removed, the sieve can be greatly reduced in solubility. These effects can be further improved by providing the conveying means 3 with a function for washing the sieve residue. As described above, the effect of washing and mixing and stirring the sieve in the storage means 4 can be improved, so that the capacity of the storage means 4 can be greatly reduced, and the sieve according to the present invention. The installation space of the transfer system can be greatly reduced.

  In addition, the wastewater separated from the sieve is returned to the storage means 4 by a sieve storage facility (not shown) installed on the downstream side of the pipe 6 and circulated for several cycles. You may do it. Thereby, the water-saving effect can be given.

  The transfer means 5 is provided outside the storage means 4 and transfers the sieve residue in the storage means 4 to the outside of the storage means.

  Here, as the transfer means 5, it is preferable to use a pump, in particular, a non-occlusive pump.

  In addition, by providing the transfer means 5 outside the storage means 4, it is possible to improve maintainability.

  The slurry in the slurry state sucked by the transfer means 5 from the sieve outlet 45 provided in the storage means 4 passes through the pipe 6 connected to the discharge side of the transfer means 5, for example, for storing the sieve. It is transferred to equipment. By using a pipe-like pipe, the pipe 6 can prevent the sieve from being scattered during the transfer, and can transfer the sieve more hygienically.

  The ON / OFF control relating to the operation of the transfer means 5 may be performed by a water level signal from a liquid level gauge 43 provided in the storage means 4. For example, when the water level signal from the liquid level gauge 43 reaches a predetermined level (High level), the operation of the transfer means 5 is started (ON), and the water level signal from the liquid level gauge 43 is set to a predetermined level ( It is preferable that the operation of the transfer means 5 is stopped (OFF) when the low level is reached.

It is a schematic block diagram which shows one Embodiment of the sieve transfer system which concerns on this invention, (a) A figure is a side view, (b) A figure is a top view.

Explanation of symbols

1 Sieve supply means (running trough)
DESCRIPTION OF SYMBOLS 11 Overflow weir 12 Overflow box 13 Bypass line 14 Level gauge 2 Crushing means 21 Drive apparatus 22 Crushing unit 3 Conveying means (screw conveyor)
31 Screw 32 Washing nozzle 33 Drain screen 34 Drain pan 35 Drain pipe 36 Drive unit 4 Storage means 41 Stirrer 42 Water jet nozzle 43 Liquid level gauge 44 Drain outlet 45 Screen discharge outlet 5 Transfer means 6 Piping

Claims (3)

Crushing means for crushing the charged sieve,
Conveying means for conveying the sieve crushed by the crushing means;
A storage means for cleaning and stirring the sieve that has been conveyed by the conveying means;
A sieve transfer system comprising a transfer means provided outside the storage means for transferring the sieve residue in the storage means to the outside of the storage means.   2. The sieve transfer system according to claim 1, wherein the conveying means has a function for washing the sieve.   The sieve transfer system according to claim 1 or 2, wherein the transfer means is a non-occlusive pump.

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