JP2005313053A - Sand-separating washing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sand-separating washing apparatus separating efficiently foreign matter contained in settled sand sucked from a sand basin with e.g. a pump, emitting less odor, treating foreign matter hygienically and permitting the separation of sand alone. <P>SOLUTION: The apparatus A comprises a sand-separating washing vessel 1 equipped with a stirring washing means 2 for sand and a sand-carrying means 3 circulating or carrying sand selectively and a washing water supplying means equipped with a pump 5 supplying washing water, together with the sand carried by the sand-carrying means 3, to the stirring washing means 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sand separation and cleaning device, and more particularly to a sand separation and cleaning device that cleans sand containing organic matter recovered from a sand basin and separates only sand.

Conventionally, sand that has been pumped from a sand basin such as a sewage treatment plant or water purification plant using a pump is solid-liquid separated by a solid-liquid separation device using specific gravity difference separation, centrifugation, etc., and only the sand content is collected. I am doing so.
However, the sand settling sand contains organic impurities such as sludge and human droppings.

By the way, in recent years, regulations regarding wastes have become stricter, and sedimentation sand containing foreign matters is handled as industrial waste, and its disposal cost has become enormous.
On the other hand, in order to dispose (or reuse) the sand sediment as a general waste, it is necessary to add a heat reduction amount of 10% or less and to reliably separate and remove foreign substances contained in the sand sediment.
However, there is a trade-off between the collection rate of sedimentation and the removal rate of contaminants. If an attempt is made to improve the removal rate of contaminants using a solid-liquid separator, the recovery rate of sedimentation will be significantly deteriorated and stored in the sedimentation basin. There is a problem that the operating time of the equipment for collecting the settling sand becomes longer and the running cost increases.

  Moreover, in order to separate and clean the sand from the sand settling with a pump from the sand settling pond, it is suitable for carrying out the sand separating and cleaning device and the sand separated by this sand separating and cleaning device. A storage hopper for temporarily storing until a predetermined amount is required, which complicates the configuration of the equipment and raises the construction cost of the equipment.

  In view of the above-described problems related to the conventional treatment of sand settling, the present invention efficiently cleans and separates the dust contained in the sand set by using a pump or the like from the sand settling basin, generates less odor, and is not contaminated. It is a first object to provide a sand separation and cleaning device that can treat only the sand component in a sanitary manner.

  Furthermore, the present invention eliminates the need for a storage hopper for temporarily storing the sand separated by the sand separation and cleaning device until a predetermined amount suitable for carrying it out, simplifies the configuration of the facility, and constructs the facility. A second object is to provide a sand separation and cleaning device that can reduce the cost.

  In order to achieve the first object, a sand separation and washing apparatus of the present invention includes a sand separation and washing tank equipped with sand stirring and washing means and sand conveying means for selectively circulating or carrying out sand, and washing water. And a washing water supply means provided with a pump for supplying the agitation washing means together with the sand conveyed by the sand conveyance means.

  Furthermore, in order to achieve the second object, the sand separation and washing apparatus of the present invention can store a required amount of sand in the sand separation and washing tank.

  In this case, the overflow water from the sand separation washing tank can be filtered with a strainer and reused as washing water.

  Further, drainage from the sand separation and washing tank can be performed by a floating weir or a pump that moves up and down following the water surface of the siphon pipe or sand separation and washing tank.

  The sand separation and washing apparatus of the present invention has been provided with a sand separation and washing tank equipped with a sand stirring and washing means and a sand conveying means for selectively circulating or carrying out sand, and washing water has been conveyed by the sand conveying means. Since the cleaning water supply means includes a pump for supplying the stirring and washing means together with sand, the sand settling from the sand basin using a pump or the like and put into the sand separation washing tank is sanded by the sand conveying means. By circulating in the separation washing tank, it is possible to efficiently wash and separate the foreign substances contained in the sand, reduce the generation of odor, and treat the foreign substances in a sanitary manner to separate only the sand. .

  In addition, by making it possible to store the required amount of sand in the sand separation and washing tank, a storage hopper for temporarily storing until a predetermined amount suitable for carrying out the sand becomes unnecessary, and the configuration of the equipment is reduced. Simplification can reduce the construction cost of equipment.

  Further, by filtering the overflow water from the sand separation and washing tank with a strainer and reusing it as washing water, the amount of washing water used can be reduced and the load on the entire system can be reduced.

In addition, waste from the sand separation washing tank is drained by floating weirs and pumps that move up and down following the water surface of the siphon pipe and sand separation washing tank, so that the impurities contained in the sand settling can be efficiently removed. Can be discharged.
And the structure of an apparatus can be simplified especially by draining from a sand separation washing tank with a siphon pipe | tube.
Drainage from the sand separation washing tank is carried out by floating weirs and pumps that move up and down following the water surface of the sand separation washing tank, so that impurities floating on the water surface of the sand separation washing tank Can be discharged efficiently.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a sand separation and cleaning apparatus of the present invention will be described with reference to the drawings.

In FIG. 1, one Example of the sand separation washing | cleaning apparatus of this invention is shown.
This sand separating and cleaning apparatus A includes a sand separating and cleaning tank 1 including a sand agitating and cleaning means 2 and a sand conveying means 3 including a screw conveyor for selectively circulating or carrying out the sand, and a sand transporting cleaning water. The washing water supply means is provided with a pump 5 comprising a booster pump or the like that supplies the stirring and washing means 2 together with the sand conveyed by the means 3.

The sand separation and washing tank 1 is configured to be able to store a required amount of sand so that it also serves as a storage hopper for temporarily storing the sand until it reaches a predetermined amount suitable for carrying out the sand.
Moreover, the sand separation washing tank 1 is stored in the sand separation washing tank 1 by being supported by the gantry F via the load cell L so that the amount of sand can be measured.
In the present embodiment, the sand conveying means 3 constituted by the screw conveyor switches the rotation direction of the screw conveyor, and is then thrown into the sand separation / cleaning tank 1 to deposit the sand settling S accumulated in the sand separation / cleaning tank 1, By circulating in the sand separation washing tank 1, contaminants contained in the sand settling S are washed and separated, and the washed sand can be carried out from the sand separation washing tank 1.

  The washing water supply means uses the pump 5 to pass the washing water stored in the water supply tank 7 installed at a position below the sand separation washing tank 1 through the pipeline 6 together with the sand carried by the sand conveyance means 3. Thus, the agitation and cleaning means 2 is supplied.

The agitation cleaning means 2 includes a pipeline 21a to which the sedimentation sand pumped from a sand basin (not shown) is supplied, and a pipeline 6 to which the cleaning water and sand from the pump 5 are supplied. A rectifying cylinder 21 having an open bottom surface connected to each other in the tangential direction is provided, so that the settling sand, washing water and sand supplied into the rectifying cylinder 21 are introduced into the sand separation and washing tank 1 while turning. Then, the swirl flow generated at this time cleans and separates impurities contained in the sand.
In addition, stirring means (not shown) such as a stirring blade that is rotationally driven by a motor may be disposed at an appropriate location in the rectifying cylinder 21 or in the sand separation and washing tank 1 as necessary.

And the contaminants isolate | separated from the sedimentation are introduced into the water supply tank 7 through the overflow tank 11 and the pipe line 12 which were formed in the upper end edge of the sand separation washing tank 1 with overflow water.
Further, the water supply tank 7 is provided with, for example, a non-powered strainer 71 for filtering the overflow water from the sand separation and washing tank 1, and the filtered overflow water is reused as washing water. This reduces the amount of cleaning water used and reduces the overall system load.
The foreign matter (sediment) captured by the strainer 71 is discharged to the container K or the like.
Moreover, the overflow tank 72 is arrange | positioned in the water supply tank 7 so that it may not become a preset water level, or more water can be drained as overflow water. The overflow water is subjected to normal sewage treatment.
Further, when the cleaning water stored in the water supply tank 7 is insufficient or dirty, new cleaning water is supplied from the cleaning water supply pipe 73.

The pipe 6 to which the washing water and sand from the pump 5 are supplied branches immediately before being connected to the rectifying cylinder 21, and the branched siphon pipe 61 is suspended in the sand separation washing tank 1, and the sedimentation sand whose lower end is accumulated. Extend to the position where S is reached.
A sandproof pipe 4 having a diameter larger than that of the siphon pipe 61 is disposed on the outer periphery of the lower end portion of the siphon pipe 61, thereby preventing the lower end opening of the siphon pipe 61 from being buried and blocked by the sand settling S. To.
The sandproof pipe 4 is bent at the lower end, and a gate 41 is disposed in the vicinity of the lower end.
The gate 41 is configured to open and close automatically or manually. For example, when the washing of the sand settling S is completed and the pump 5 is stopped, the gate 41 is opened and the siphoning action of the pipeline 6 is used to separate and wash the sand. The water stored in the tank 1 is made to flow backward through the siphon pipe 61 and the pipe line 6 so that it can be drained to the water supply tank 7.
For this reason, a check valve 63 and an on-off valve (electric valve) 64 are provided in the pipeline 6.

  The screw conveyor as the sand conveying means 3 is disposed at the lower part of the sand separation / cleaning tank 1 so that the front end side for carrying out the sand is slightly raised, and the sedimentation sand S accumulated in the sand separation / cleaning tank 1 flows in. Thus, the screw 32 is disposed in a cylindrical casing 31 having an open upper surface so that the rotation direction can be switched by the motor 33.

  Further, a sand discharge port 34 is formed on the tip side of the screw conveyor where the sand is carried out. To.

Moreover, the pump 5 which consists of booster pumps etc. is arrange | positioned at the base end side of a screw conveyor.
In the present embodiment, the casing 31 of the screw conveyor and the casing 51 of the pump 5 are integrated, and the screw 32 of the screw conveyor and the impeller 52 of the pump 5 are rotated by a common motor 33. In addition, the base end side of the pipe line 6 is connected to the casing 51 of the pump 5.
In this case, it is preferable that the impeller 52 is rotationally driven via a transmission using a planetary gear mechanism or the like so that the rotational speed of the impeller 52 is higher than that of the screw 32 (for example, 400 to 600 rpm). .

Further, a pipe line 60 connected to the water supply tank 7 is connected to the casing 51 of the pump 5 so that water is supplied from the water supply tank 7 into the casing 51. The settling sand that is quantitatively transferred from the screw conveyor as the sand conveying means 3 into the casing 51 is supplied to the stirring and washing means 2 through the pipeline 6 while being mixed in the casing 51. .
Note that an open / close valve (electrically operated valve) 65 is also provided in the pipe line 60.

Next, the usage method of this sand separation washing | cleaning apparatus A is demonstrated.
Sediment sand (hydrated sediment containing impurities) from the sand basin using a pump or the like is supplied into the rectifying cylinder 21 of the stirring and washing means 2 via the pipe 21a. The settling sand supplied into the rectifying cylinder 21 becomes a swirling flow, is introduced into the sand separation washing tank 1, settles while being washed, and accumulates at the bottom of the sand separation washing tank 1.
In this way, after a predetermined amount of sand is put into the sand separation and washing tank 1, the screw conveyor as the sand transport means 3 is rotated in one direction, whereby the sand is quantitatively introduced into the casing 51 of the pump 5. The water is transferred and supplied to the agitation and cleaning means 2 through the pipe 6 while mixing in the casing 51 with the cleaning water supplied into the casing 51 of the pump 5 from the water supply tank 7. Similarly, the settling sand supplied into the rectifying cylinder 21 becomes a swirling flow, is introduced into the sand separation / cleaning tank 1, sinks while being washed, and accumulates at the bottom of the sand separation / cleaning tank 1, The operation is repeated.
The washing of the sand set S is performed by setting the operation time of the motor 33 by a timer (not shown). For example, by increasing the set time by the timer, the number of circulation times of the sand set S is increased and washing is performed more reliably. It will be something that can be done.

By the way, the settling sand supplied into the rectifying cylinder 21 is turned into a swirling flow and introduced into the sand separation and washing tank 1, so that impurities contained in the settling sand, for example, organic matter such as sludge and human feces. The natural impurities are naturally separated from the sand by the difference in specific gravity, and the impurities separated from the sand are passed through the overflow tank 11 and the pipe 12 formed at the upper edge of the sand separation washing tank 1 together with the overflow water. And introduced into the water supply tank 7.
Since the strainer 71 is disposed in the water supply tank 7, the overflow water is filtered by the strainer 71 and reused as washing water. On the other hand, the foreign matter (sludge) captured by the strainer 71 is used. ) Is discharged into a container K or the like and incinerated.

When washing of the sand set S is completed, the operation of the motor 33 (pump 5) is stopped.
As a result, water supply from the water supply tank 7 is also stopped. However, since the water supply tank 7 is installed at a position below the sand separation and washing tank 1, the water in the sand separation and washing tank 1 By opening the gate 41 of the sand prevention pipe 4, it is introduced into the water supply tank 7 through the sand prevention pipe 4, the siphon pipe 61, the pipe line 6, the booster pump 5 and the pipe line 60 by the siphon phenomenon. The drainage in the tank 1 can be performed. In addition, since the check valve 63 is provided in the pipe line 6 connected to the rectifying cylinder 21, air is not sucked from the pipe line 6 side connected to the rectifying cylinder 21.

After draining the sand separation washing tank 1 in this way, the screw conveyor in the sand separation washing tank 1 is rotated by rotating the screw conveyor as the sand conveying means 3 in the direction opposite to the previous direction. The sand S can be sequentially transferred to the front end side of the screw conveyor and discharged from the gate 35 having the discharge port 34 opened.
At this time, by arranging a truck or the like below the discharge port 34, the discharged sand can be loaded onto the truck and transported to a predetermined place.

  When the discharge of the sand is completed, new sand settling from the settling basin (hydrated settling sand containing impurities) is put into the sand separation and washing tank 1 through the flow straightening cylinder 21 of the stirring washing means 2. Thereafter, the same operation is repeated to wash the sediment.

By the way, in the said Example, the water stored in the sand separation washing tank 1 is made to flow backward through the siphon pipe | tube 61 and the pipe line 6 using a siphon effect | action, and it drains to the water supply tank 7. However, as shown in FIG. 2, it can also be performed via the floating weir 8.
The floating weir 8 moves up and down following the fluctuation of the water level by disposing a float 82 on the floating weir body 81 having an overflow port 81h on the side surface. The guides 81g projecting at both ends are inserted and guided through guide rods 83 disposed in the sand separation and washing tank 1, and the guide rods 83 are moved when the floating weir body 81 moves up and down following the fluctuation of the water level. It moves in the horizontal direction along the slope.
A flexible hose 84 is attached to the floating weir body 81, and an outlet 85 of the hose 84 is connected to the pipeline 12 leading to the water supply tank 7.
Further, in order to prevent the hose 84 from being buried in the sand accumulated in the sand separation and washing tank 1, sandproof plates 86 are disposed on both sides of the flexible hose 84, and the floating weir body 81 is moved according to the movement. The hose 84 can freely move in the space formed between the sandproof plates 86.
The floating weir 8 can drain the water stored in the sand separation washing tank 1 regardless of the fluctuation of the water level by moving the floating weir body 81 in the vertical direction following the fluctuation of the water level. However, since it moves in the horizontal direction in accordance with the movement in the vertical direction, foreign substances floating over a wide range of the sand separation and washing tank 1 can be reliably discharged together with water.

FIG. 3 shows a different type of floating weir 80.
The floating weir 80 is made in a cylindrical shape using a material whose specific gravity is lighter than that of water, for example, synthetic resin, on the floating weir body, and an overflow port 80h is formed on the outer surface of the floating weir body so that the floating weir body is flexible. A water hose 84 is connected and drained to the water supply tank 7.

In addition, a pump 9 as shown in FIG. 4 can also be used as means for draining the water stored in the sand separation / cleaning tank 1 to the water supply tank 7.
The pump 9 floats on the surface of the water so that the suction port is below the surface of the water at the float 91, is connected to a hose 84 at the discharge port 92, and is provided with a tank 7 ′ having a strainer 71 ′. 'Is used to drain the water tank 7).

  As mentioned above, although the sand separation washing | cleaning apparatus of this invention was demonstrated based on the Example, this invention is not limited to the structure described in the said Example, The structure is suitably comprised in the range which does not deviate from the meaning. It can be changed.

  The sand separation and cleaning apparatus of the present invention efficiently cleans and separates impurities contained in the sand that has been pumped from a sand basin using a pump or the like, generates less odor, and treats the contaminants in a sanitary manner. In addition, it is possible to separate only the sand content, and further eliminate the need for a storage hopper for temporarily storing until a predetermined amount suitable for carrying out the sand separated by the sand separation and cleaning device, and to configure the equipment. Since it can be simplified and the construction cost of the facility can be reduced, it can be suitably used for the treatment of sand settling using a pump from a sand settling basin such as a sewage treatment plant or a water purification plant.

It is sectional drawing which shows one Example of the sand separation washing | cleaning apparatus of this invention. One Example of the floating weir which drains a sand separation washing tank is shown, (A) is whole sectional drawing, (B) is a top view, (C) is a front view. It is explanatory drawing which shows one Example of the floating weir which drains a sand separation washing tank. One Example of the pump which drains a sand separation washing tank is shown, (A) is sectional drawing, (B) is a top view.

Explanation of symbols

A Sand separation and cleaning device 1 Sand separation and washing tank 2 Stirring and washing means 3 Sand conveying means 4 Sandproof pipe 5 Pump 6 Pipe line 60 Pipe line 61 Siphon pipe 7 Water supply tank 8 Floating weir 9 Pump

Claims (6)

  A sand separation and washing tank equipped with sand agitation and washing means and a sand conveyance means for selectively circulating or carrying out the sand, and supplying washing water to the agitation and washing means together with the sand conveyed by the sand conveyance means A sand separating and cleaning device comprising a cleaning water supply means equipped with a pump.   The sand separating and cleaning apparatus according to claim 1, wherein a required amount of sand can be stored in the sand separating and cleaning tank.   3. The sand separation and washing apparatus according to claim 1, wherein overflow water from the sand separation and washing tank is filtered by a strainer and reused as washing water.   4. The sand separating and cleaning apparatus according to claim 1, wherein drainage from the sand separating and cleaning tank is performed by a siphon tube.   4. The sand separation and washing apparatus according to claim 1, wherein drainage from the sand separation and washing tank is performed by a floating weir that moves up and down following the water surface of the sand separation and washing tank.   4. The sand separation and cleaning apparatus according to claim 1, wherein drainage from the sand separation and washing tank is performed by a pump that moves up and down following the water surface of the sand separation and washing tank.

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