JP4557604B2 - Sand setter - Google Patents

Description

  The present invention relates to a sedimentation classifier, and in particular, after washing to remove sediment (contamination) from sedimentation sand (including sediment, hereinafter referred to as “sedimentation”) collected from a sedimentation basin in a sewage treatment plant. The present invention relates to a sand setter that separates the washed sand set according to the particle size and individually takes it out.

Conventionally, sand settling using a pump from a sand settling basin such as a sewage treatment plant or a water purification plant is washed by a sand settling device that performs solid-liquid separation using differential gravity separation, centrifugation, etc. The dust floating inside is allowed to overflow with the sewage to collect the sand that settles at the bottom.
However, even in the washed sedimentation sand, it is in a state of being mixed from a sludge-like particle size as small as a pebbles having a relatively large particle size.

  By the way, in recent years, regulations concerning waste have become stricter, and since the sand collected from the sand basin is generally handled as industrial waste, the disposal cost becomes enormous.

  However, if the sand is washed to remove impurities, the sand can be reused as a recycled resource, not industrial waste, but the conventional sand settling device has a high water content in the washed sand, If the moisture content is not lowered through other steps, there is a problem that it cannot be adopted as a recycled resource unless the particle size is made uniform.

  In view of the problems of the conventional sand settling treatment described above, the present invention removes impurities by washing the sand settling, discharges the washed sand set to the same particle size, and discharges it at a certain moisture content or less, The purpose is to provide a sand classifier that can be reused as

In order to achieve the above object, the sand setter of the present invention is a sand settling / separation tank that stores and cleans a predetermined amount of settling sand, and is adjacent to the sand settling / cleaning tank and is inclined so that the tip side becomes higher. The washed sand settling is swept up and discharged , and a sieve hole is provided in the screw casing above the sand settling separation washing tank to provide a sand settling function, and at the upper end. The screw conveyor is provided with a gravel discharge chute, and a microwave generator for drying the settling sand disposed in a portion of the screw conveyor having a sieving function .

  In this case, it is possible to arrange the rectifying cylinder in the sand settling / separation tank so as to wash the sand settling by causing a swirling flow in the sand settling water supplied to the sand settling / cleaning tank.

According to grit classifier of the present invention, it can be discharged by aligning the particle size of the sand easily reuse as resources are carried out easily and can reduce also the process costs.

And since the screw conveyor adjacent to the sand settling separation washing tank is inclined and arranged so that a tip may become high, draining of the settling sand swept up by the screw conveyor can be performed easily.

  In addition, the screw conveyor has a sieving function above the sedimentation separation washing tank so that the particle size of the sedimentation can be sorted and discharged. It is possible to automatically remove sand particles by aligning them.

  In addition, a microwave generator is installed on the part of the screw conveyor that has a sieving function to dry the sunk sand, so that it can be dried simultaneously in the sunk sand lifting process. It becomes unnecessary.

In addition, a rectifying cylinder is provided in the sand settling / separation washing tank, and it is configured to cause a swirling flow in the sand settling water supplied to the sand settling / washing tank to wash the settling sand. It is possible to easily carry out agitation and washing of the sand.

  Hereinafter, embodiments of a sand setter according to the present invention will be described with reference to the drawings.

In FIG. 1, one Example of the sand settling machine of this invention is shown.
This sedimentation classifier A has a hopper-shaped lower part, and collects a predetermined amount of sediment collected from the sedimentation basin, etc., and pumps it to wash it with washing water and / or sedimentation mixed water. Adjacent to the tank 1 and the sand settling separation washing tank 1, the washed sand settle is scraped up and separated according to the particle size to be discharged according to the sand settling and conveying screw conveyor 2. .
The upper part of the sand separation washing tank 1 is provided with a cylindrical rectifying cylinder 3 having an open bottom surface, and when the sunk sand mixed water recovered from the settling basin and the like and pumped into the rectifying cylinder 3 is supplied, In order to generate a swirling flow in the rectifying cylinder 3, the sunk sand mixed water supply pipe 4 is connected in the tangential direction of the rectifying cylinder 3, and further washed and separated in the sand separation and washing tank 1. An overflow weir 5 is disposed in the sand separation and washing tank 1 for allowing the residue to overflow with the sewage and discharging it.
In addition, a drain outlet 51 is provided at a lower position of the overflow weir 5 so that the residue can be discharged together with the sewage.

The screw conveyor 2 for separating and transporting the settling sand is disposed adjacent to each other so that the discharge side of the tip is raised along one inclined side wall of the settling separation washing tank 1 and is washed in the settling separation washing tank 1. However, it flows into the screw conveyor 2 through the sand sink inlet and is driven by the cyclo reducer M so that the washed sand can be lifted up.
The screw conveyor 2 is cylindrical or U-shaped, and has a spiral blade on the outer periphery of the screw shaft 22 over almost the entire length of the screw casing 21 having a sand sink inlet 27 formed in the lower part. The screw 23 formed by winding is rotatably arranged, and is arranged at the shaft end of the screw shaft 22, and is not particularly limited, but is configured to be driven at a low speed by the cyclo reducer M, for example. .
At the lower end of the screw casing 21, a drain port 26 that is normally closed is provided. During maintenance such as cleaning of the screw conveyor 2, the drain port is opened to allow drainage, and the upper end is sieved. A gravel discharge chute 8 for discharging the relatively large granular gravel and coarse dust sorted out is disposed. The gravel discharge chute 8 is provided with a discharge port 81.

Further, the screw conveyor 2 has a sieving function at an upper position of the adjacent sand-sediment separating and washing tank 1. This is not particularly limited to the upper position of the screw conveyor 2, but, for example, as shown in the figure, a number of sieve holes 25 having a diameter of a diameter to be selected are formed in the screw casing 21 above the sedimentation washing tank 1. The hopper 6 is disposed at the external lower position where the sieving hole is drilled, so that the cleaning sand having a relatively small particle size discharged from the sieving hole 25 is received and discharged from the discharge port 61 of the hopper 6. To do.
Further, a microwave generator 7 is disposed on the upper side of the screw conveyor 2 having the sieving function. A plurality of the microwave generators 7 are installed, and thereby, the sand set up by the low-speed rotation drive of the screw in the screw casing 21 is dried.
A shield 71 is disposed on the outer surface of the microwave generator 7.

  The sieve hole 25 may be clogged with washing sand or the like when used. In order to prevent this, a cleaning brush 24 protrudes from the outer periphery of the screw shaft 22 at a position that does not hinder the lifting action by the spiral blades, and the sieve hole 25 is cleaned by rotating the screw 23. To.

Next, the operation of the sand settling machine of the present invention will be described.
When the sedimentation mixed water pumped from a sedimentation basin or the like is supplied from the tangential flow into the rectifying cylinder 3 from the sedimentation mixed water supply pipe 4, a swirling flow is generated in the rectifying cylinder 3. At this time, the settling sand is agitated, and impurities such as organic matter are separated and floated, and the settling sand settles using the difference in specific gravity while being washed and reaches the position of the screw conveyor 2. Since the sedimentation inlet 27 is formed in the screw casing 21 of the screw conveyor 2, the sedimentation settled on the bottom part inevitably flows into the screw casing 21.

  When the amount of sand settling reaches a certain level or when the screw conveyor 2 is arbitrarily driven by the cyclo reducer M, the sand settling into the screw casing 21 is gradually lifted up inside the screw casing 21 by the rotation of the screw. . When the scraped sand becomes higher than the surface of the water, the sewage that has been scraped together with the sand sinks down the screw casing 21 as shown by the arrows in the drawing, and the sand is further swept up.

  When the scraped sand reaches a position having a sieving function, the screw casing 21 is provided with a sieving hole 25, so that the sand sediment particles smaller than the hole diameter are sieved into the hopper 6 outside the screw casing 21. It flows out and is discharged from the outlet 61 to the outside. At this time, the settling sand that has reached this sieving function position is heated by the microwave generator 7 and dried so that its moisture content decreases.

  Moreover, some of the small sand-settling particles are clogged in the sieving holes 25, and the sieving function may be lowered. In such a case, since the cleaning brush 24 is provided in the screw, the cleaning brush 24 rotates together with the screw to clean the inner peripheral surface of the screw casing, particularly the sieve hole 25 portion, to prevent clogging and to continue. It will be possible to perform the classic sand sedimentation.

Gravel and coarse dust with relatively large particles that have not been sifted through the sieving hole 25 are further swept up by a screw, and discharged to the outside through the gravel discharge chute 8 disposed at the tip of the screw casing. Is done.
Thus, since the required sedimentation and classification are performed in the transport process, the water content is also reduced, and the particle size of the sedimented sand to be discharged is made uniform. Sand sediment with small discharged particles can be reused as concrete sand.
As a result, the sand settled by the sand settling machine of the present invention can be reused not only as a resource but also as a general waste, which has an advantage of reducing the processing cost.

  As mentioned above, although the sand settling machine 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 changed in the range which does not deviate from the meaning. Is something that can be done.

  Since the sand settling machine of the present invention has the property of simultaneously discharging and discharging the settling sand during conveyance by the screw conveyor, it can be suitably used for the application of settling sand, for example, It can also be used for an upflow type sand settling separator or a rectangular sand settling machine.

It is a vertical front view which shows one Example of the sand settling machine of this invention.

A. Sand sediment classifier 1 Sand sediment separation and washing tank 2 Screw conveyor 21 Screw casing 22 Screw shaft 23 Screw 24 Cleaning brush 25 Sieve hole 26 Drain port 27 Sand sediment inlet 3 Rectifier tube 4 Sand sediment mixing water supply pipe 5 Overflow weir 51 Drain port 6 Hopper 61 Discharge port 7 Microwave generator 71 Shield 8 Gravel discharge chute 81 Discharge port

Claims (2)

A settling sand separating and washing tank that stores and washes a predetermined amount of settling sand, and is disposed adjacent to the settling sand separating and washing tank and inclined so that the tip side is raised , and the washed settling sand is lifted and discharged. And a screw conveyor provided with a function of sieving sand by drilling a sieving hole in a screw casing located above the sand settling and washing tank and having a gravel discharge chute at the upper end, and the screw conveyor A sedimentation classifier comprising: a microwave generator for drying the sedimentation disposed in a portion having a sieving function .   2. A sand setter according to claim 1, wherein a rectifying cylinder is provided in the sand settling / separation tank and the settling water is supplied to the sand settling / washing tank to cause a swirling flow to wash the settling sand. .

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