JP4808462B2 - Separation method of sand and garbage using running water trough - Google Patents

Description

  The present invention relates to a method for separating sand and waste using a flowing water trough, and in particular, during the process of transporting sand generated by scouring from a sand basin such as a sewage treatment plant, the waste contained in the sand is easily simplified. The present invention relates to a method for separating sand and waste using a flowing water trough that is separated and removed.

  Conventionally, there is no particular limitation on a sand washing system in a sewage treatment plant. For example, sand settling at the bottom of a sand basin is scraped up by a V bucket sanding machine, and the sand is collected using a running trough. It is made to convey to a required processing process. As shown in FIG. 1, the flowing water trough as the conveying means flows the settling sand together with water or sewage from one end of a steel trough having a U-shaped or V-shaped cross section. It is intended to transport transported material such as sand mixed with dust, and the bottom of the running trough is inclined toward the transporting direction so that the sediment of the transported material does not collect at the bottom of the trough. Provided.

By the way, the sewage sand pumped from the sand basin contains a mixture of sand with a high specific gravity and low water flow resistance, and trash with a low specific gravity and high water flow resistance. The flow in the running trough varies depending on the difference.
In general, sand sink has a large specific gravity and low water flow resistance, so it is difficult to ride on the water flow, so it is transported near the trough bottom at a speed slower than the water flow. Conversely, garbage has a shape with low specific gravity and high water flow resistance. Therefore, since it is easy to get on the water flow, it is conveyed down at a relatively high speed near the water surface at almost the same speed as the flow velocity of the water.

However, the conventional flowing trough is provided with a gradient in the conveying direction, but the water mixed with the settling sand supplied in the flowing trough always flows down at the same flow velocity. By simply letting it flow down, the sand and the dust in the settling sand are not separated, and are discharged in a state where the sand and the dust are mixed from the terminal end (exit) of the flowing water trough. For this reason, a sorting machine with a dust removal function is installed after the running water trough, and this sorter separates and removes garbage. For this reason, there existed a problem that the structure of a sand-washing washing | cleaning system was complicated and enlarged, and equipment cost increased.
In addition, when the separator cannot be installed due to the civil engineering structure of the sand basin in the sewage treatment plant and the arrangement of other equipment, there is a problem that it is not possible to separate the sand from the waste.

  In view of the problems of the conventional running water trough, the present invention utilizes the fact that sand and dust in the settling sand flow down at different positions in the running water trough at different speeds. The object of the present invention is to provide a method for separating sand and waste using a flowing water trough that separates the sand from the settling sand and the waste in the middle of the flow in the flowing water trough.

To achieve the above object, the sand utilizing the present onset bright flowing water trough, method of separating waste outlet side of the water flow trough upwardly and to discharge by separating the sand fraction and dust in sand is opened The separation plate is placed horizontally along the flow direction of the water at the boundary between the falling sand and waste caused by the difference in specific gravity and shape, and the upstream end of the separation plate is above the sand discharge outlet. When the waste is entangled with the separation plate, the upstream side of the separation plate is arranged so that it can swing downward, and the sand flowing down the running water trough and the waste are separated by their specific gravity difference and According to the difference in shape, the water flow is used for separation and discharge.

Sand using this onset bright flowing water trough, according to the method of sorting waste, conventional there is no need to install a classifier downstream side of the flowing water trough, as a simple method of simply flow down the flowing water trough can be discharged through the separation and the sand fraction and a dust in nature and sand, it reduces the equipment number, it is possible to reduce its cost of equipment, it is also possible to reduce running costs and maintenance expenses.

And since the separation plate is movable, even if a large amount of dust gets entangled with the separation plate, especially the tip of the separation plate, the entangled waste is scraped off by the water flow by the swing of the separation plate and removed It is possible to suppress the growth of entangled waste and effectively separate sand and waste.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a method for separating sand and waste using a running water trough of the present invention will be described with reference to the drawings.

FIG. 1 to FIG. 3 show an embodiment of a method for separating sand and waste using the flowing water trough of the present invention (FIGS. 1 to 2 are reference examples) .
From one end side, sand that has been mixed from the sedimentation basin is added, and by pouring water into it, the sand is arranged to flow down in the running trough 1 toward its outlet side. The bottom part 11 of the flowing water trough 1 is configured to be inclined toward the outlet side.
Further, on the outlet side of the running water trough 1, as well as arranging the precipitated sand outlet 12 and dust discharge port 13 to discharge each separating the sand fraction S Togomi D in sand, flowing water trough outlet in In addition, a sorting plate 2 is provided that allows the sand S and dust D in the flowing sand to be separated naturally by the difference in specific gravity and shape.

The separation plate 2 is disposed on the outlet side of the flowing water trough 1, and as shown in FIG. 1, the separating plate 2 flows down the flowing water trough 1 due to a difference in specific gravity and a difference in shape, and sand S and dust D flowing down. Install it almost horizontally at the border.
By the way, the dirty sand pumped from the sand basin contains a sand S having a large specific gravity and a dust D having a relatively low specific gravity. Therefore, the specific gravity, shape, etc. of the sand S and the waste D are mixed. The flow in the running water trough differs depending on the difference. Sand with a large specific gravity is difficult to ride in the water flow trough 1 when flowing down the trough 1 and is transported down the trough bottom at a slower speed than the water flow. On the other hand, garbage has a small specific gravity and is easy to ride in the water flow. It is conveyed down at approximately the same speed as the water flow rate.
Therefore, the sand S having a large specific gravity slowly flows down along the inner bottom portion of the flowing water trough 1, and the waste D is conveyed down on the water flow near the water surface in the flowing water trough 1. There will be a boundary between the falling sand and garbage.
The separation plate 2 is disposed so as to be substantially horizontal, for example, although it is not particularly limited so as to be along the flow direction of water at the position that becomes the boundary between the sand and the dust. By using the water flow of the sand S and the dust D flowing down in the flowing water trough by the separation plate 2 due to the difference in specific gravity and shape, the waste D flows above the separation plate and the sand below the separation plate sinks. S flows so that sand and garbage are separated from nature.

For this reason, there is no need to install a sand / garbage separator on the downstream side of the running water trough as in the past, and it is possible to separate the sand and waste in the sand by a simple method that just flows down the running water trough. And since it will be discharged | emitted from each discharge port 12 and 13, and the number of apparatus of a system will reduce, facility cost can be reduced and running costs, such as a maintenance management cost, can also be reduced.
In addition, the sand sediment S discharged from the sand sediment discharge port 12 is further carried out to a facility for subsequent processing, and the waste D passes over the separation plate 2 and is discharged from the waste discharge port 13 together with the waste water. The contaminated waste D is captured by a net cage disposed below the waste outlet 13, returned to the settling basin, or captured and removed using a drum-type screen or the like (not shown). Can do.

In addition, as shown in FIG. 1, the separation plate 2 is disposed so as to cover the entire upper surface of the sand settling outlet 12 leaving a gap that allows sand to pass through, or as shown in FIG. It arrange | positions so that the rear half above the sand settling outlet 12 may be covered.
When the separation plate 2 covers the rear half above the sand settling outlet 12, it is effective when there is a large amount of sand flowing from the running water trough into the sand settling outlet 12.
Further, as shown in FIG. 3, the separation plate 2 is formed in an L shape, and the upper end thereof is a hinge 20, which is attached to the flowing water trough side so as to be swingable like a pendulum. As a result, when the dust concentration is high, if the dust D grows by being entangled with the separation plate 2, there is a possibility that the sedimentation discharge port 12 may be blocked. The dropping force acts, and the growth of garbage on the separation plate 2 can be suppressed.

Figure 4 shows the sand using a flow water trough, another reference example of method of separating waste.
This reference example is the same as the above embodiment in that the sand settling outlet 12 and the garbage outlet 13 are disposed on the outlet side of the flowing water trough 1. A step wall 21 is provided so as to separate the sand discharge port 12 and the dust discharge port 13.
As shown in FIG. 4 (A), the step wall 21 has a top surface at the position where the separation plate 2 is disposed in the above-described embodiment, that is, sand S having a large specific gravity and dust D having a relatively small specific gravity. Is separated by the difference in specific gravity and the difference in shape so that it flows down. As a result, sand having a large specific gravity is blocked by the step wall 21 and flows into the sand settling outlet 12, and dust having a small specific gravity flows over the top surface of the step wall 21. It flows down into the waste outlet 13 and the sand and the waste are separated.

  In this case, as shown in FIG. 4B, the tip end angle of the step wall 21 can be formed in an arc shape 21a. Thereby, even when the amount of dust flowing down is large and the dust D is likely to be entangled with the tip of the step wall 21, the tip of the arc shape 21a of the step wall 21 can prevent the entanglement of dust.

Figure 5-6 shows the sand using a flow water trough, another reference example of method of separating waste.
In this reference example, the bottom surface of the flowing water trough 1 is installed so as to be substantially horizontal, and the gradient of the flowing water trough is eliminated or reduced as much as possible, and one outlet 14 is disposed on the outlet side. Further, although not particularly limited to the downstream side of the flowing water trough 1, for example, as shown in FIG.
In addition, the amount of water supplied to the flowing trough 1 is changed selectively. This is not particularly limited, but, for example, the number of operating water pumps (not shown) is switched, or the water supply capacity of the water pump is switched.

For example, when two water supply pumps are used, if only one water supply pump is operated, the amount of water supplied to the flowing water trough 1 is inevitably reduced, so that the flow velocity in the flowing water trough 1 is also reduced. As a result, the sand S having a large specific gravity is accumulated in the inner bottom portion of the flowing water trough 1, and only the dust D having a small specific gravity is conveyed down in the flowing water trough 1, and is discharged to the outside from the discharge port 14 provided on the outlet side. Discharged.
At the lower position of the outlet 14 of the running water trough 1, the leading end side of the carrying means 32 comprising a conveyor such as a flight conveyor is bifurcated, one of which is a sand sink outlet 33 and the other is a garbage outlet 34. A switching damper 3 having a switching valve 31 is provided at the branch position. The switching valve 31 of this switching damper 3 is switched to the waste system facility side of the waste discharge port 34, and the waste is carried out to the waste system facility. Then, after completion of the sand pumping in the sand basin, another unit of the water supply pump that feeds water to the running trough 1 is driven, and two units are operated simultaneously. As a result, the amount of water supplied to the flowing water trough 1 is increased, the flow velocity in the flowing water trough is also increased, and the sand sediment S accumulated in the bottom of the trough flows and is conveyed. At this time, if the switching damper of the rear stage device is switched to the sand settling facility side, the sand set S is carried out to the sand settling facility via the sand settling outlet 33.

7 shows sand using flow water trough, another reference example of method of separating waste.
In the sedimentation washing system of the sewage treatment plant, the sedimentation discharge port 12 may have to be branched in the lateral direction of the flowing water trough 1 for convenience of arrangement.
In such a case, at the bottom of the branch portion of the flowing water trough 1, a slanting separating plate 2 in which the sedimentation discharge port side is inclined to the downstream side is disposed, and the sedimentation S is guided from the flowing water trough 1 to the sedimentation discharge port 12. Like that.
The separation plate 2 is a low-profile plate bent in an L shape, and is attached in an oblique direction with respect to the center line of the flowing water trough 1.
As a result, the sand sediment S flowing through the bottom of the flowing water trough 1 collides with the separation plate 2 and falls to the sand sediment discharge port while being guided obliquely downstream by the water flow.
On the other hand, the waste D can flow and pass through the upper layer of the separation plate 2, whereby the sand and the waste in the settling can be easily and effectively separated.

In this case, as shown in FIGS. 8A and 8B, a shielding plate 4 that shields the water flow of the flowing water trough 1 is disposed at the branch inlet of the sand settling outlet 12, and the shielding plate 4 and the flowing water trough 1 A gap 41 into which the sand sediment S flows can be provided between the bottom surface. The shielding plate 4 is movable so that the lower gap 41 can be adjusted arbitrarily.
As a result, it is possible to minimize the amount of residue flowing out to the sand settling outlet 12 and improve the separation effect of sand and waste.
In FIG. 8B, the separation plate 2 is omitted (see FIG. 7B).

Moreover, as shown in FIG.8 (C), the flowing water gap 42 which allows water to flow in between the shielding board 4 and a branch inlet can also be provided in the downstream edge part of a branch inlet.
Thereby, even when there is a possibility that the gap 41 may be clogged due to stagnation of the residue or biting of foreign matter, the flow toward the sand sediment discharge port 12 is not obstructed by the flowing water gap 42, thereby blocking the gap 41. Can be prevented.
In this case, as shown in the figure, the downstream end 43 of the shielding plate 4 is bent toward the flowing trough 1 so that the water flow is kept away from the downstream side of the shielding plate 4, so that It is possible to prevent tangling of the residue and biting of foreign matter.

Above, the sand utilizing flowing water trough of the present invention, the method of separating dirt, but is not limited to these embodiments of that, the present invention is not limited to the configuration described in the embodiment described above, the gist those that can be relocated as appropriate the structure in deviant no range.

  The method for separating sand and garbage using the flowing water trough of the present invention uses the flowing water trough with a separation function to separate sand and garbage using the water flow due to the difference in specific gravity and the shape of the sand and the garbage. Since it can be used, it can be used suitably for the use of a sand washing system in a sewage treatment plant, and for example, can also be used for a use of a sand basin facility.

Sand using flow water trough, shows a reference example of method of separating waste, (A) is a front longitudinal sectional view, (B) is a side longitudinal sectional view. Sand using flow water trough, a front longitudinal sectional view showing the deformation reference example of method of separating waste. It is a front longitudinal cross-sectional view which shows one Example of the separation method of the sand and garbage using the flowing water trough of this invention. Sand using flow water trough, a front longitudinal sectional view showing another reference example of method of separating waste. Sand using flow water trough, shows another reference example of method of separating waste, a (A) Wagomi front longitudinal sectional view of the time of ejection, (B) is a front longitudinal sectional view at the time of sand discharged. It is explanatory drawing at the time of the switching discharge of the sand and garbage in the reference example. Sand using flow water trough, shows another reference example of method of separating waste, (A) is a plan view, (B) is a longitudinal front view. The modification of the reference example is shown, (A) is a plan view, (B) is a longitudinal front view, and (C) is a plan view showing another modification.

S sedimentation D waste 1 running water trough 11 bottom of running water trough 12 sedimentation outlet 13 waste outlet 14 outlet 2 sorting plate 20 hinge 21 step wall 3 switching damper 31 switching valve 32 unloading means 33 sand sink outlet 34 waste outlet 4 shielding Plate 41 Gap 42 Flowing water gap 43 Downstream end of shielding plate

Claims (1)

The boundary position between the sand fraction and dust and falling to come sand and dust caused by the difference in specific gravity difference and the shape of the outlet side of the water flow trough upwardly and to discharge through the separation is opened in sand, water Place the separation plate horizontally along the flow-down direction, the upstream end of the separation plate is located above the sedimentation discharge port, and when the waste gets entangled with the separation plate, the upstream end of the separation plate faces downward. A flowing water trough characterized by being arranged so as to be able to swing, and separating and discharging sand and garbage flowing down in the flowing water trough using the water flow according to the difference in specific gravity and shape. How to separate used sand and garbage.

Images