JP4570401B2 - A sand washing and conveying system in a sand basin - Google Patents

Description

  The present invention relates to a sand washing and conveying system in a sand basin, and in particular, the sand (or sewage) of each section sand basin arranged in a plurality of rows is pumped by a small sand pump, collected and collected together. It is transported to a sand cleaning and storage device with a cleaning and storage function that is arranged at a higher place by a large sand cleaning and transporting device that has a cleaning and transporting function. In addition, the present invention relates to a sand removal washing and conveying system in a sand settling basin in which impurities are separated and removed and the sand washing is temporarily stored and discharged.

  Conventionally, in a sewage treatment plant, etc., rainwater is introduced into a sedimentation basin, and sediment contained in the rainwater is previously settled and removed in the sedimentation basin, and the supernatant water is treated and discharged into rivers, etc. In addition, the sand is pumped up using a high-pump sand pump, jet pump, etc. disposed in the sand basin and discharged outside the sand basin.

  By the way, in the conventional sedimentation basin discharge, sand collected in the sedimentation basin is pumped from the sedimentation area to the hopper room at once using a sand pump, jet pump, etc. Therefore, since this cannot be used directly for land reclamation or the like, the high water content sedimentation sand is directly transported to the solid-liquid separation device and is reduced to the required water content by the solid-liquid separation device or the like.

For this reason, sand pumps such as sand pumps, jet pumps, etc., which have a large lifting head and require a large amount of power, are used for sanding and transporting in the sand basin, particularly in a large treatment plant where a plurality of sand basins are installed. In addition to the use of a large amount of water, another large transport means is required, and since a large amount of water is also used for sand transport, a device for dewatering it is necessary, and the system is inevitably complicated. In addition to the increase in size and equipment costs, the sedimentation also includes contaminants containing organic matter, and the sand cannot be used for landfill as it is. There was a problem in that it was necessary to carry out a removal process.
In addition, sand pumps have difficulty in burying, blocking, and wear resistance, and it becomes necessary to repair them by using them for about one to two years at the earliest. There was a problem that the running cost for lifting (maintenability) and repairing to be increased.

  In view of the problems of the sand pumping and conveying system in the conventional sand settling basin described above, the present invention provides a small sand pump for each of the sand settling or dirty sand (hereinafter referred to as “sand settling”) settled in a plurality of sectioned settling basins. Efficiently as if the sand was pumped in and collected from the sand pumps together and transported from one large sand cleaning and transporting device to the sand cleaning and storage device located at a higher location. It is an object of the present invention to provide a sand-carrying and cleaning system in a sand basin that can wash sand, separate and remove foreign substances contained in the sand, and temporarily store it for discharge.

In order to achieve the above-described object, the sand washing and conveying system in the sand basin according to the present invention is arranged in each of the plurality of divided sand basins, and the sand settling on the pond bottom is sanded to the slab. A plurality of sand pumps, a sand cleaning / conveying device having a function of cleaning and conveying the sand collected from each sand pump disposed on the slab, and a sand cleaning / conveying device disposed at a higher position. It consists of a sand cleaning and storage device that cleans and stores sand transported from the device, and it efficiently cleans sand in multiple stages, separates and removes foreign substances, and temporarily stores sand. A sand washing and conveying system in a sand settling basin, wherein the sand washing and conveying device is connected to a sand separating and washing tank and a sand washing and repetitive washing and sand washing and storing device at the bottom of the sand separating and washing tank. To be able to selectively carry out And washing the sand conveying means consisting of a screw conveyor and booster pump, the inner upper part of the sand separator cleaning tank, connected collecting sand pipe from sand pump tangentially into the upper outer peripheral surface, the sand mixed water is supplied The sand washing and storing device comprises a sand separating and washing tank that also serves as a storage hopper, and a sand washing and conveying device at the bottom of the sand separating and washing tank. From the screw conveyor and the booster pump that can selectively drain the supplied primary sand, store it after washing and discharge it to the outside, and make it possible to drain water by inclining the tip side to be higher. and washing the sand conveying means comprising, on the inner upper part of the sand separator cleaning tank, connecting the lifting sand pipe from the sand washing conveying apparatus tangentially to the upper outer peripheral surface, provided by Agesuna mixing water is supplied Characterized in that constitute one Tsugiaraisuna was equipped with a rectifying tube which is adapted to stir washing.

  According to the sand washing cleaning and conveying system in the sand basin of the present invention, a plurality of sands arranged in each of the plurality of divided sand basins and settling sand settling on the bottom of the pond to the slab. A pump, a sand cleaning / conveying device disposed on the slab and having a function of cleaning and conveying the sand collected from each sand pump, and further disposed at a high position and conveyed from the sand cleaning / conveying device It consists of a sand washing and storage device designed to wash and store sand, and it efficiently cleans sand in multiple stages, separates and removes foreign substances, and temporarily stores sand. In addition, sand pumps can be used for each section of the sand basin to reduce power and make repairs cheaper, improve maintainability, and also provide sand cleaning and conveying equipment that places sand on two slabs and high places. And sand washing and storage equipment Multi-stage advanced cleaning in stages is possible, cleaning and separation of contaminants can be performed more reliably, and booster pumps that are resistant to burial, blockage and wear are used, so maintenance frequency is reduced, initials, running costs and equipment The total power can be reduced.

And the sand washing conveyance which consists of a sand separation washing tank and the screw conveyor and booster pump which enabled it to selectively perform washing of sand washing to the bottom bottom part of the sand separation washing tank, and carrying out to the sand washing storage device And a rectifying cylinder connected to a sand collecting pipe from a sand pump on the upper outer peripheral surface from the tangential direction at the inner upper part of the sand separation and washing tank, and by which the settling water is supplied to stir and wash the settling sand. By constructing a sand cleaning and transporting device, it is possible to easily and repeatedly repeat the cleaning according to the dirt of the sand, so it is easy to separate and remove the sand and impurities, and use a booster pump By doing so, maintainability can also be improved.

In addition, a sand separation and washing tank that also serves as a storage hopper, and cleaning of primary sand supplied from the sand washing and conveying device to the lower bottom of the sand separation and washing tank, storage after washing, and discharge to the outside are selectively performed. Sand washing transport means consisting of a screw conveyor and a booster pump that can be drained by tilting so that the tip side becomes higher, and sand cleaning and conveying on the upper outer peripheral surface of the sand separation and washing tank A sand washing storage device is configured by connecting a sand raising pipe from the apparatus in a tangential direction and a rectifying cylinder configured to stir and wash the primary sand supplied by supplying the sand-mixed water. Since the first washed sand can be further repeatedly washed, the sand and foreign substances can be separated and removed more reliably, and can be discharged after draining the sand. Post-processing Easy to, it is possible to improve maintainability by using a booster pump.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a sand washing and conveying system in a sand basin according to the present invention will be described based on the drawings.

FIG. 1 to FIG. 6 show an embodiment of the sand washing and conveying system in the sand basin of the present invention.
The sand washing cleaning and conveying system in the sand settling basin is not particularly limited, for example, the sand settling basin S arranged in a sewage treatment plant or the like. For example, as shown in FIG. The ponds S1, S2, S3 are each equipped with sand pumps (sand pumps) P1, P2, P3 which are small and have a relatively low head, and the sand collected from each of the sand pumps P1, P2, P3 is branched into the sand collecting pipe 81. , 82, 83, and collected in the sand collecting pipe 8, and supplied to the sand washing and conveying apparatus A having a large capacity disposed on the slab and having both a washing function and a conveying function through the sand collecting pipe 8. The sand cleaning and conveying apparatus A is further transported to a sand cleaning and storing apparatus B having both a cleaning function and a storage function disposed at a higher position, and the sand cleaning and conveying apparatus A and the sand cleaning and storing apparatus B. Washing sand and separating and removing impurities in two stages And is configured so that it can.

As shown in FIGS. 1 and 2, each of the section sand basins S 1, S 2, S 3 forms a sand collecting tank Sp by denting a part of the pond bottom, for example, deepening the central part, and The pond bottom surface Sb is inclined so as to become lower toward the sand collecting tank Sp, so that the sand settling on the pond bottom surface Sb is smoothly collected in the sand collecting tank Sp, and the compartment sand settling A dust remover G is provided at one end of each of the ponds S1, S2 and S3, and the dust (mainly organic matter) is removed by the dust remover G so that the sewage in each of the divided sand basins S1, S2 and S3. To allow inflow.
In this case, a plurality of sand collecting nozzles N1, N2, and N3 are disposed along the pond bottom surface Sb so that the sand collected on the pond bottom is collected into the sand collecting tank Sp more reliably. Each sand collecting nozzle is supplied with water for collecting sand. In addition, water supply to the sand collecting nozzles N1, N2, and N3 is performed by absorbing water in the partitioning sand basin with a sand collecting water pump Po disposed in a water supply pit Pa formed in the sand basin. , N2, and N3, this is not particularly limited, and can be performed from a water receiving tank or the like.

Sand collected in each sand collection tank Sp is sucked up together with water by each sand pump P1, P2, P3 arranged in each sand collection tank Sp and branched sand collection pipes 81, 82, 83. To the sand cleaning and conveying apparatus A through the sand collecting pipe 8.
This sand cleaning and conveying apparatus A cleans the sand that has been sucked up from all the sand pumps P1, P2, and P3, and removes and removes impurities contained in the sand. It is disposed on the slab of the sand settling basin S so that it can be easily transported to the sand washing and storing apparatus B disposed above the transport apparatus A.

The sand cleaning and conveying apparatus A is not particularly limited. For example, as shown in FIGS. 3 and 4, the sand separating and cleaning tank 1 that cleans and discharges the inflowing sand, and water supply The tank 7 and washing water supply means formed so that washing water from the water supply tank 7 can be supplied into the sand separation washing tank 1 through the water supply pipe 4 and the booster pump 5 are constituted.
This sand separation and washing tank 1 has a required inner volume so as to serve as a storage hopper that can temporarily store the sand after washing a required amount of sand, and an overflow tank 11 is provided at the upper edge. The drainage pipe 12 is connected to the lower position of the overflow tank 11 so that the overflow water containing the separated and separated impurities is drained to the outside, and further returned to the water supply tank 7, and the sand separation and washing tank The sand-washing conveying means 3 is arranged at the lower bottom of 1, and the agitation washing means 2 is arranged at the inner upper part.

As the sand washing transport means 3, the sand sediment after being simply washed by the agitation deposited on the lower bottom portion of the sand separation washing tank 1 is further washed and carried out, and this is particularly limited. Although it is not a thing, a screw conveyor is arrange | positioned along the lower bottom part of the sand separation washing tank 1, for example.
The agitation / cleaning means 2 agitates the sand-mixed water of the sand-sediment and the washing water introduced into the sand separation / cleaning tank 1 to wash the sand, and is not particularly limited. However, it can be configured with, for example, a rectifying cylinder 2a having an open bottom surface.
And the sand raising pipe 6 and the sand collecting pipe 8 are respectively connected to the upper outer peripheral surface of the rectifying cylinder 2a from the tangential direction, and the sand raising mixed water or the sand settling water is supplied.
The rectifying cylinder 2a may be provided with a stirring blade (not shown) that is rotated by a motor, if necessary, or a water supply pipe (not shown) from the tangential direction to the upper outer peripheral surface of the rectifying cylinder 2a. ) Can enhance the cleaning action.

As shown in FIG. 4, the screw conveyor 3 as the sand washing conveying means is disposed over the entire length of the lower part of the sand separation washing tank 1 and is at least deposited on the bottom of the sand separation washing tank 1 after washing. A screw 3b is rotatably arranged in a cylindrical casing 3a whose upper surface is opened so that sand can be introduced, and the screw 3b is rotated forward or reverse by a driving device M having a motor. Are configured to be selectively switchable, and are further provided with a drain pipe 3d for draining at the tip of the casing 3a.
The direction of rotation of the screw 3b is determined so that the primary sand is transported to the main booster pump 5 provided at the right end during normal operation.
Further, a booster pump 5 is disposed at the end of the screw conveyor 3 so that the screw conveyor 3 and the booster pump 5 are respectively optimally driven by a driving device M including a motor, a transmission, and the like. For example, the screw conveyor 3 side is driven at a low speed and the booster pump 5 side is driven at a high speed at different speeds.

When the booster pumps 5 and 5A are provided at both ends of the screw conveyor 3, respectively, the left booster pump 5A is used as a spare, and used when the main right booster pump 5 breaks down. Thus, when this spare booster pump 5A is used, the rotational direction of the screw conveyor 3 is reversed, and the sand washing is conveyed to the spare booster pump 5A side.
The booster pump 5 and the backup booster pump 5A have the same configuration. The booster pump 5 is driven by rotating the impeller 5b accommodated in the casing 5a by the driving device M. Further, the sand pump 6 is connected to the casing 5a to the sand washing and storing device B. Make it possible to supply sand-washed sand.

  The base end side of the sandpump 6 is branched to the casing 5a of the booster pump 5, and the other end is branched into the rectifying cylinder 2a of the sand cleaning and conveying apparatus A through the on-off valve 6a, and the other side Is connected to the stirring and washing means 20 (rectifying cylinder 20a) of the sand washing and storing apparatus B through the on-off valve 6b. By opening / closing the on-off valves 6a and 6b, the primary sand washing from the booster pump 5 (or the auxiliary booster pump 5A) is rectified into the rectifying cylinder 2a of the sand washing and conveying apparatus A or the sand washing and storing apparatus B. It is switched to the cylinder 20a so that it can be fed and conveyed.

  The sand washing and storing apparatus B that also serves as a storage hopper is formed with the same components as the sand washing and conveying apparatus A. For example, as shown in FIGS. The water supply tank 70 and the washing water from the water supply tank 70 are stirred and washed via the booster pump 50 via the water supply pipe 40 provided with the water supply valve 40a and further through the sand raising pipe 61 provided with the on-off valve 61b. It is comprised from the sand raising supply means formed so that the sand raising may be supplied in the rectifying cylinder 20a of the means 20.

The sand separation and washing tank 10 includes an overflow tank 11, and a drain pipe 12 is connected to a lower position of the overflow tank 11 so that the overflow water is returned to the water supply tank 70.
Further, a screw conveyor 30 as sand-washing conveying means for further washing and carrying out the first sand-washed sand is supplied to the lower bottom portion of the sand separation and washing tank 10, and the inner upper portion thereof is charged. A stirring / washing means 20 is provided in which the primary sand-washing water is stirred to further wash the primary sand-washing water.

The screw conveyor 30 is configured such that the primary sand is further washed by the rotation of the screw 30b in the casing 30a, and the tip side is slightly raised so that the completely washed sand is drained and discharged. In the cylindrical casing 30a, the upper surface of the sand separating and washing tank 10 is opened so that the sand that is deposited on the inner bottom portion of the sand separating and washing tank 10 can flow in. The screw 30b is rotatably arranged, and the screw 30b is configured to be rotationally driven by the driving device M so as to be selectively switched between forward rotation and reverse rotation. Further, at the tip of the casing 30a, A discharge hopper 30h is provided for temporarily storing and discharging the washed sand.
Further, the discharge hopper 30h is provided with a gate 30g, and can be opened or closed manually by operating a handle, or the dump truck 30h can be automatically opened and closed so that it can enter the position below the tip of the screw conveyor 30. It can be dropped on the loading platform and discharged.

  Further, the booster pump 50 is driven by rotating the impeller 50b accommodated in the casing 50a by the driving device M, and a sand-pumping pipe 61 is connected to the casing 50a to wash it into the rectifying cylinder 20a. The sand can be supplied and the water supply pipe 40 is connected to enable water supply from the water supply tank 70.

The stirring and cleaning means 20 is not particularly limited, but can be configured with, for example, a rectifying cylinder 20a having an open bottom surface.
And the sand pipe 6 and the sand pipe 61 are connected to the upper outer peripheral surface of the rectifying cylinder 20a from the tangential direction, respectively, so that the sand-mixed water is supplied and the sand is naturally stirred and washed. ing.
The rectifying cylinder 20a may be provided with a stirring blade (not shown) that is rotated by a motor, if necessary, or a water supply pipe (not shown) from the tangential direction to the upper outer peripheral surface of the rectifying cylinder 20a. ) Can enhance the cleaning action.

In addition, since the water supply tanks 7 and 70 have the same structure and effect | action, the one water supply tank 7 is demonstrated.
The water supply tank 7 can store a required amount of water, can be drained as overflow water so as not to exceed the set water level, and a non-powered strainer 72 is disposed in the water supply tank body 71, and a drain pipe 12 is connected to remove the contaminants (dust such as residue) contained in the overflow water from the sand separation and washing tank 1 or the sand separation washing tank 10 by filtration, and the removed impurities (trash such as residue). ) Is discharged by a container K or the like.

The operation of this embodiment will be described below.
The sand settling from each of the settling basins S1, S2 and S3 of the settling basin S is sucked up by sand pumps P1, P2 and P3, respectively, and the sand collection water is branched via the sand collection pipes 81, 82 and 83. 8 is supplied from the tangential direction into the rectifying cylinder 2a of the sand cleaning and conveying apparatus A having a large capacity and one cleaning function and a conveying function disposed on the slab through the sand collecting pipe 8.
Since the settling sand supplied into the rectifying cylinder 2a is supplied from the tangential direction, when it flows down as a swirling flow in the rectifying cylinder 2a, impurities are separated and washed using the difference in specific gravity. The The sand that has been separated and cleaned is deposited on the inner bottom of the sand separation and washing tank 1.

  When a predetermined amount of sand is introduced, the screw conveyor 3 is rotated in the forward direction by the driving device M. Thereby, the sedimentation sediment deposited and stored in the tank bottom is conveyed to the booster pump 5 side by a fixed amount by the screw conveyor 3. At this time, although there is a small amount of foreign matter that could not be separated and removed in the flow straightening cylinder 2a, the booster pump 5 is driven simultaneously with the forward rotation of the screw conveyor 3 and the water supply tank. Since the water is fed to the booster pump 5 from the water supply pipe 7 through the water supply pipe 4, the sand that has been conveyed is mixed with the water supply by opening the open / close valve 6 a and closing the open / close valve 6 b, and again through the sand pipe 6 and the flow straightening cylinder 2a, and again washed in the flow straightening cylinder 2a. At this time, residual impurities that have not been separated and washed in one step of swirling down the flow straightening cylinder 2a are removed, and the primary sedimentation Cleaning is performed.

In this way, by repeating the washing process by swirling flow in the flow straightening cylinder, the sand is washed and the impurities are separated and removed, and then the sand is deposited and deposited on the inner bottom of the sand separation washing tank 1.
This primary sand washing is performed by setting the operating time of the booster pump 5 with a timer. In this case, the washing time can be set longer by increasing the timer setting, and the sand is separated and washed multiple times. Can do.

When the separation cleaning in the sand cleaning / conveying device A is completed, the on-off valve 6a of the sand pipe 6 is closed and the on-off valve 6b is opened while the screw conveyor 3 and the booster pump 5 are driven. The first washed sand is fed into the flow straightening cylinder 20 of the sand washing and storage device B having both a washing function and a storage function arranged at an upper position via the sand raising pipe 6.
When all the first cleaned sand is supplied from the sand cleaning and conveying apparatus A to the sand cleaning and storing apparatus B, the supply of the primary washed sand to the sand cleaning and storing apparatus B is stopped and the sand cleaning and conveying is performed. The next settling sand that has been sanded from the sand pump is supplied to the apparatus A from the sand collecting pipe 8.

  The primary sand that is supplied to the sand washing and storing device B is washed while separating residual impurities that could not be separated by the sand washing and conveying device A when the swirling flow sequentially in the flow straightening cylinder 20. Also in this case, if sufficient cleaning is not possible in a single cleaning process, the screw conveyor 30 is reversely driven while opening the water supply valve 40a from the water supply tank 70 to the booster pump 50 and supplying water via the water supply pipe 40. The primary sand is sent again from the opened on-off valve 61b through the sand raising pipe 61 into the rectifying cylinder 20, and washing and removal of residual contaminants are performed. It is deposited on the inner bottom of the tank 10.

  After the washing is sufficiently performed in this way, when the sand is settled at the bottom of the tank, the sand separation and washing tank 10 is drained, and then the on-off valve 61b is closed and the screw conveyor 30 is driven to rotate forward. By doing so, the sufficiently washed sand is conveyed to the discharge chute side in the casing 30a of the screw conveyor 30, stored in the discharge chute 30h, and discharged to the outside by opening the gate 30g. In this case, since the sand washing and storing apparatus B is disposed at a high position, the dump truck T or the like can be easily discharged by the T.

  In this way, small sand pumps P1, P2, and P3 that can sand up to the top of the slab are used in a plurality of divided sand basins, and the sand pumping from the top of the slab to the discharge hopper is resistant to burial and blockage, and wear resistance By using a good booster pump, it is possible to perform cleaning and separation / removal of contaminants in two stages of the sand cleaning and conveying device A and the sand cleaning and storing device B. It will be able to separate and clean sand and deep sand.

  As mentioned above, although the sand washing washing conveyance system in the sand basin of this invention was demonstrated based on the Example, this invention is not limited to the structure described in the said Example, In the range which does not deviate from the meaning, it is appropriate. The configuration can be changed.

  The sand washing and conveying system in the sand settling basin of the present invention separates and cleans the sediment in a multistage manner from the contaminated sand mixed water collected from the sand settling basin, etc., and temporarily stores the sand washed as it is. Because it has the property of being able to be used, it can be suitably used for the separation and washing of sand sediments. For example, it can also be used for sand sediment reuse facilities (recycling centers, etc.) such as construction aggregates. be able to.

It is a front view which shows one Example of the sand removal washing | cleaning conveyance system in the sand basin of this invention. It is the same top view. It is explanatory drawing which expanded the sand washing | cleaning part, (A) shows the sand washing | cleaning conveyance apparatus with a washing | cleaning and conveyance function, (B) shows the sand washing | cleaning storage apparatus with a washing | cleaning and storage function, respectively. It is an expanded sectional view of a sand washing conveyance device. It is an expanded sectional view of a sand washing storage device. It is explanatory drawing of a foreign material carrying-out, (A) is the top view, (B) is a front view.

A Sand cleaning and conveying device B Sand cleaning and storage device M Drive device S Sand settling basin Sp Sand collecting tank S1, S2, S3 Compartment settling basin P1, P2, P3 Sand pump 1, 10 Sand separation and cleaning tank 2 Stir washing means 2a, 20a Rectification Tube 3 Sand-washing means (screw conveyor)
4, 40 Water supply pipe 5, 50 Booster pump 5A Spare booster pump 6, 61 Sanding pipe 7, 70 Water supply tank 8 Sand collection pipe 11 Overflow tank

Claims (1)

A plurality of sand pumps arranged in each of the plurality of divided sand basins and settling on the bottom of the pond to raise the sand to the slab, and collected from each sand pump arranged on the slab A sand cleaning and transporting device having a function of cleaning and transporting the sand lifted, and a sand cleaning and storing device which is disposed at a high place and is configured to clean and store sand transported from the sand cleaning and transporting device. It is configured to efficiently clean sand in multiple stages, separate and remove impurities, and temporarily store sand in a sand basin for a sand basin.
A sand conveyor and booster pump, wherein the sand cleaning and transporting device is configured to selectively perform repeated cleaning of the washed sand and delivery to the sand cleaning and storing device at the bottom of the sand separating and cleaning tank; A sand collecting pipe from a sand pump is connected to the upper outer peripheral surface from the tangential direction at the inner upper part of the sand washing and conveying means consisting of And a rectifying cylinder made of
The sand washing and storing device is a sand separating and washing tank that also serves as a storage hopper, and the primary washing sand supplied from the sand washing and conveying device to the bottom bottom of the sand separating and washing tank, the storage after washing, and the outside The sand washing conveying means consisting of a screw conveyor and a booster pump that can be drained by selectively discharging, and can be drained by inclining so that the tip side becomes higher, and the upper outer circumference on the inner upper part of the sand separation washing tank The surface is provided with a rectifying cylinder that is connected to the surface from the tangential direction with a sandpipe pipe from the sand cleaning and conveying device and stirs and cleans the primary sand that has been supplied by supplying the pumped sand mixed water . A sand washing and conveying system in a sand basin characterized by that.

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