JP2007111676A - Operation method of sand-separating washing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation method of a sand-separating washing apparatus by which throughput over of the sand-separating washing apparatus can be prevented from getting over its limit by adjusting sand concentration in muddy sand mixed water at every job site. <P>SOLUTION: A back washing pipe 18 is connected from a driving water pump 22 of a jet pump 21 to the lower part of a strainer 3. A sand pumping stroke for introducing the muddy sand mixed water and a water supply back washing stroke for supplying water via the back washing pipe 18 are alternately repeated for optional time to adjust sand concentration in the muddy sand mixed water. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for operating a sand separation and cleaning device, and in particular, a sand separation and cleaning device capable of preventing the processing capacity of the sand separation and cleaning device from being exceeded by adjusting the sand concentration of the sewage mixed water for each site. It relates to the driving method.

  Conventionally, sand that has been pumped from a sand basin such as a sewage treatment plant or water treatment plant using a jet pump is solid-liquid separated by a solid-liquid separation device using specific gravity difference separation, centrifugal separation, etc., and only the sand is collected. Like to do.

  By the way, in these sand separation and cleaning devices, when there is a lot of sedimentation, such as after heavy rain, the jet pump may pump a large amount of sand at a time, which increases the processing capacity of the sand separation and cleaning device. May overrun.

  In view of the problems of the conventional sand separation and washing apparatus, the present invention is capable of preventing the sand separation and washing apparatus from exceeding its processing capacity by adjusting the sand concentration of the sewage mixed water for each site. It aims at providing the operating method of a washing device.

  In order to achieve the above-mentioned object, the operation method of the sand separation and washing apparatus of the present invention is to introduce sewage mixed water into the solid-liquid separation tank tangentially by a jet pump and to remove sewage sand and garbage by centrifugal force by swirl flow. In the operation method of the sand separation and washing device that disperses and separates the specific gravity and separates the particle size of sand and gravel with an inverted frustoconical sieve, a backwash pipe is connected from the jet pump drive water pump to the lower part of the sieve. In addition, the sand concentration process for introducing the sewage mixed water and the water supply backwash process for supplying water through the backwash pipe are alternately repeated at any time to adjust the sand concentration of the sewage mixed water. To do.

  In this case, the sand separation and washing apparatus includes a solid-liquid separation tank into which the sewage mixed water is introduced, and a sedimentation tank installed under the solid-liquid separation tank, and the solid-liquid separation tank is tangential. A cylindrical tube wall that generates a swirling flow that descends along the peripheral wall by flowing in the sewage mixed water in a direction, and a bottom wall composed of an inverted frustoconical sieve disposed at the bottom of the tube wall; And a drainage duct for discharging water near the center of the bottom wall to the outside.

  Further, the sand separation and cleaning device includes a solid-liquid separation tank into which sewage mixed water is introduced, and a sedimentation tank installed under the solid-liquid separation tank, and the solid-liquid separation tank is in a tangential direction. A cylindrical tube wall that generates a swirling flow descending along the peripheral wall by flowing in the sewage mixed water, a bottom wall made of an inverted frustoconical sieve disposed at the bottom of the tube wall, and A circulation duct connecting the opening of the bottom wall and the upper part of the solid-liquid separation tank, and an ejector connected to a part of the circulation duct can be provided.

According to the operation method of the sand separation and washing apparatus of the present invention, the sewage mixed water is introduced into the solid-liquid separation tank in the tangential direction by a jet pump, and the sewage sand and garbage are dispersed by centrifugal force by the swirling flow to separate the specific gravity. At the same time, in the operation method of the sand separation and washing device that separates the particle size of sand and gravel with an inverted conical sieve, a backwash pipe is connected to the lower part of the sieve from the driving water pump of the jet pump to mix the sand Since the sanding process for introducing water and the water supply backwash process for supplying water through the backwash pipe are alternately repeated for an arbitrary period of time to adjust the sand concentration of the sewage mixed water, it can be used after a heavy rain. Even when the pump pumps a large amount of sand at a time, the sand concentration of the mixed sand can be adjusted at each site by alternately repeating the sanding process and the water supply backwash process at any time. As a result, the processing capacity of the sand separation and cleaning device is increased. It is possible to prevent the over.
Moreover, a pump for backwashing becomes unnecessary, and it becomes possible to carry out sanding, sand collection, water supply and backwashing with one conventional driving water pump.

In this case, the sand separation and washing apparatus includes a solid-liquid separation tank into which the sewage mixed water is introduced, and a sedimentation tank installed under the solid-liquid separation tank, and the solid-liquid separation tank is in a tangential direction. A cylindrical tube wall that generates a swirling flow that descends along the peripheral wall by allowing the mixed sand water to flow into the bottom wall, and a bottom wall made of an inverted frustoconical sieve disposed at the bottom of the tube wall; By providing a drainage duct for discharging water near the center of the bottom wall to the outside, the centrifugal force generated by the swirling flow disperses and separates the specific gravity and separates the specific gravity, and sand and gravel are separated by the bottom wall sieve. In this way, dust and gravel with a large specific gravity difference are collected near the center of the bottom wall, and gravel with a large specific gravity is dropped from the center of the bottom wall into the sedimentation tank and collected together with the sand, while the specific gravity is small. Garbage can be efficiently and selectively discharged together with water through the drainage duct.
That is, in the past, since the specific gravity difference separation was performed in a state where sand, waste, and gravel were mixed, the suction flow velocity of the drainage duct could not be increased in order to suppress the outflow of sand. In the separation and cleaning apparatus, gravel and waste having different specific gravities are separated by specific gravity difference, so that the suction flow rate can be increased as compared with the conventional case, and the dust removal efficiency can be increased.
Moreover, by sucking the water in the sedimentation tank with a strong suction flow of the drainage duct, the flow rate of the sieve wall passing through the bottom wall can be increased, thereby enhancing the sieving effect.

Further, the sand separation and cleaning device includes a solid-liquid separation tank into which sewage mixed water is introduced, and a sedimentation tank installed under the solid-liquid separation tank, and the solid-liquid separation tank is in a tangential direction. A cylindrical tube wall that generates a swirling flow descending along the peripheral wall by flowing in the sewage mixed water, a bottom wall made of an inverted frustoconical sieve disposed at the bottom of the tube wall, and Distributing dirt sand and waste by centrifugal force due to swirling flow by providing a circulation duct connecting the opening of the bottom wall and the upper part of the solid-liquid separation tank and an ejector connected to a part of the circulation duct In addition to separating the specific gravity difference, sand and gravel are separated by particle size using a sieve on the bottom wall, and garbage and gravel with a large specific gravity difference are collected near the center of the bottom wall, and collected at regular intervals by the ejector and circulation duct. Garbage and gravel are recirculated through the solid-liquid separation tank and left after the operation is completed. By pulling out of the tank, distinguished from the gravel pieces or glass pieces which may be precipitated with gravel, it is possible to recover the sand only.
At this time, gravel and waste need to be separated for disposal, and therefore a gravel waste separator is required. As the gravel waste separator, a conventional product upward flow classifier or the like can be used.

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

1 to 3 show a first embodiment of the operation method of the sand separation and cleaning apparatus of the present invention.
The sand separation and cleaning device includes a solid-liquid separation tank 1 into which dirty sand mixed water is introduced, and a sedimentation tank 2 installed under the solid-liquid separation tank 1.
The solid-liquid separation tank 1 is disposed at a cylindrical cylindrical wall 3 that generates a swirling flow that descends along the peripheral wall by allowing the sewage mixed water to flow in a tangential direction, and at the bottom of the cylindrical wall 3. A bottom wall 4 made of an inverted frustoconical sieve and a drainage duct 5 for discharging water near the center of the bottom wall 4 to the outside are provided.
The operation method of the sand separating and cleaning apparatus of the present embodiment is as follows. In this sand separating and cleaning apparatus, the backwash pipe 18 is connected to the lower side of the sieve 3 from the driving water pump 22 of the jet pump 21 to introduce the contaminated sand mixed water. The sand process and the water supply back-washing process of supplying water through the backwash pipe 18 are alternately repeated at arbitrary times to adjust the sand concentration of the sewage-mixed water.

Switching between the sanding stroke and the water supply backwashing stroke is performed by opening and closing motor-operated valves M1 to M5 disposed in the pipe.
In the sanding stroke, the water of the driving water pump 22 is sent to the jet nozzle as usual, and in the water supply backwashing stroke, the water of the driving water pump 22 is changed to the jet nozzle by switching the motorized valves M1 to M5. Send to backwash tube 18 without sending.
In this case, as shown in FIG. 2, after the sanding stroke is performed for an arbitrary time T1, the water supply backwashing stroke is performed for an arbitrary time T2, and this alternating operation is repeated until the number of repetitions n reaches the predetermined number of times k.
If the sanding stroke time T1 is short and the scheduled number of times k is large, the amount of sanding at one time is small, and if the sanding stroke time T1 is long and the number of scheduled times k is small, the amount of sanding at one time is large. .

When there is a lot of sedimentation, such as after heavy rain, the jet pump 21 may cause a large amount of sedimentation to be pumped at once.
In this case, since it is expected that the instantaneous input amount greatly exceeds the limit processing capacity, the piping 23 is added to the conventional system so that the input amount can be adjusted.
When installing the jet pump 21 on a slab, it is set as the flow which can stop the drive water pump 22 once after counting a fixed sanding process and a feed water backwash process a fixed number of times. The stop period is about 5 to 10 seconds as in the sand pump.
The operation of the sand separating and cleaning apparatus is basically one batch operation / one pond. After the sanding of the first pond, the sand pump is stopped and then the sanding of the second pond is started.
Even in the wastewater concentration treatment, continuous input for a long time is avoided, and a pause period is provided for each appropriate period. In addition, it is necessary to consider such as limiting the amount of dirt received.

Next, the above sand separation and cleaning apparatus will be described.
A separation hopper 6 for allowing the inverted swirling flow to flow over is provided at the upper part of the cylindrical wall 3, and an inflow pipe 7 for the mixed waste sand so that the swirling flow passes between the separating hopper 6 and the cylindrical wall 3. Are connected tangentially.
The sand mixing water is pumped into the inflow pipe 7 from a sand pump (not shown) such as the jet pump 21, and an annular overflow that receives the overflow water of the separation hopper 6 around the separation hopper 6. A trough 61 is installed.

The bottom wall 4 is formed in a mortar shape having a sieve mesh formed by a punching screen or the like, and an opening 41 is formed at the center.
As shown in FIG. 3 (b), the bottom wall 4 can be elastically supported by a coil spring 8 or the like so as to move up and down. The sieve of the bottom wall 4 vibrates (oscillates) due to the water pressure that constantly fluctuates due to the accumulation of dust and the swirling flow, and the vertical gravitational force always acts on the gravel captured on the sieve surface. It is possible to prevent gravel from getting caught in the eyes.

  The drainage duct 5 is composed of a pipe having an opening above the center of the bottom wall. The drainage duct overflows due to the head difference h of the water surface caused by the height of the side wall above the drainage duct 5, thereby sinking from the sieve mesh. A suction flow is generated so as not to suck sand, and only gravel and dust collected near the center of the bottom wall 4 are sucked together with water and discharged to the outside.

The sedimentation tank 2 is continuously disposed below the solid-liquid separation tank 1 with the bottom wall 4 as a boundary. In this embodiment, the sedimentation tank 2 is formed in a rectangular shape in which a screw conveyor 9 is integrally disposed at the lower part. .
A backwash pipe 18 is connected to the settling tank 2, and drive water is supplied from the drive water pump 22 of the jet pump 21 through the backwash pipe 18 during a water supply backwash process.

On the other hand, in the sand separating and cleaning apparatus, as shown in FIG. 5, an air supply device 14 that supplies bubbles from below to the opening 41 of the bottom wall 4 and generates turbulence near the center of the bottom wall 4 is provided. Can do.
The air supply device 14 generates a large number of fine bubbles from the air diffuser nozzle 17 installed below the opening 41 of the bottom wall 4 from the blower 15 through the pipe 16.
Further, as shown in FIG. 6, the air supply device 14 can also supply fine bubbles to the back surface of the bottom wall 4 from below.
For example, when backwash water is supplied from a backwash pipe 18 installed under the bottom wall 4, in order to enhance the backwash effect, air from the blower 15 is blown from the diffuser nozzle 17 side to the backwash nozzle on the back of the bottom wall. The valve is switched to the 19th side, and the dust adhering to the sieve of the bottom wall 4 can be floated by the air blow effect.

In the sand separating and cleaning apparatus, as shown in FIG. 7, the dust is collected in the vicinity of the center of the bottom wall 4 on the swirl flow formed on the surface of the bottom wall 4 and is extracted by the upward flow of the drainage duct 5. It is like that.
By the way, for example, the thin-plate-like garbage 20 such as a pull tab of can juice or a thin rubber is easy to ride on the swirling flow because the area receiving the water flow is large.
However, since the thin-plate-like garbage 20 is collected in a vertical posture by the action of the swirling flow, the area that receives the water flow becomes small with respect to the upward flow, and it becomes difficult to ride the flow. It settles from the opening part 41.
Therefore, as shown in FIG. 5, by supplying bubbles to the opening 41 of the bottom wall 4 from below and generating turbulent flow near the center of the bottom wall 4, thin plate-like shapes gathered in a vertical orientation are collected. The garbage 20 is placed in a posture other than the vertical direction in which it is easily sucked into the drainage duct 5 by turbulent flow, so that the thin plate-like dust 20 that tends to sink is sucked in the upward flow of the drainage duct 5.

Next, the operation of this sand separation and cleaning apparatus will be described.
A swirling flow is generated by causing the sewage mixed water introduced from the jet pump 21 to flow from the tangential direction of the cylindrical solid-liquid separation tank 1.
Sand, gravel, and dust are dispersed by centrifugal force generated by the swirling flow generated here and separated by specific gravity, and sand and dust are separated by a conical sieve on the bottom wall 4.
The sand that has passed through the conical sieve due to the water sieve effect settles in the rectangular sedimentation tank 2 and is carried out by the screw conveyor 9.

On the other hand, the separated dust and gravel naturally gather near the center of the bottom wall 4 due to the synergistic effect of the conical shape of the sieve and the swirl effect caused by the swirling flow.
Then, the dust is caused to overflow with the drainage by the suction flow generated at the center of the bottom wall 4, and the gravel is dropped from the opening 41 of the bottom wall 4 to the settling tank 2 and carried out together with the sand.
Since the conventional sand washer separates the specific gravity in a state where sand, dust and gravel are mixed, the suction flow velocity of the drainage duct 5 could not be increased in order to suppress the outflow of sand. In this case, since the gravel and garbage are greatly different in weight, it is possible to increase the suction flow velocity as compared with the conventional case, and it is possible to increase the efficiency of removing the dust.
In addition, by causing a flow in the rectangular sedimentation tank 2 by the suction flow of the drainage duct 5, the passing flow rate of the sieve can be increased, and the sieving effect can be enhanced.

Thus, in the operation method of the sand separation and washing apparatus of the present embodiment, the dirty sand mixed water is introduced into the solid-liquid separation tank 1 in the tangential direction by the jet pump 21, and the dirty sand and waste are dispersed by the centrifugal force by the swirl flow. In the operation method of the sand separating and washing apparatus that separates the specific gravity and separates the particle size of sand and gravel by the inverted conical sieve 3, the backwash pipe is provided below the sieve 3 from the driving water pump 22 of the jet pump 21. 18 is connected, and the sand concentration process for introducing the sewage mixed water and the water supply backwash process for supplying water through the backwash pipe 18 are alternately repeated for an arbitrary time to adjust the sand concentration of the sewage mixed water. Therefore, even when the jet pump 21 unloads a large amount of sand at a time after heavy rain, etc., the sand-mixed water sand can be obtained by alternately repeating the sand-rolling step and the water supply back-washing step each time. The concentration can be adjusted for each site. More, it is possible to prevent the throughput over the sand separator cleaning device.
Moreover, a pump for backwashing becomes unnecessary, and it becomes possible to carry out sanding, sand collection, water supply and backwashing with one conventional driving water pump.

In this case, the sand separation and cleaning device includes a solid-liquid separation tank 1 into which the waste sand mixed water is introduced, and a sedimentation tank 2 installed under the solid-liquid separation tank 1, and the solid-liquid separation tank 1 is From the cylindrical tube wall 3 that generates a swirling flow descending along the peripheral wall by flowing the mixed sand water in the tangential direction, and an inverted conical sieve disposed at the bottom of the tube wall 3 Provided with a bottom wall 4 and a drainage duct 5 for discharging water near the center of the bottom wall 4 to disperse dirt sand and waste by centrifugal force due to swirling flow and separate the specific gravity difference. Sand and gravel are separated in particle size by the sieve of the wall 4, thereby collecting dust and gravel having a large specific gravity difference near the center of the bottom wall 4, and gravel having a large specific gravity is transferred from the center of the bottom wall 4 to the settling tank 2. While dropping and collecting with sand, waste with small specific gravity is efficiently and selectively collected with water by the drainage duct 5 It can be out.
That is, conventionally, since the specific gravity difference separation is performed in a state where sand, waste, and gravel are mixed, the suction flow velocity of the drainage duct 5 cannot be increased in order to suppress the outflow of sand. In the embodiment, gravel and waste having different specific gravities are separated by specific gravity difference, so that the suction flow rate can be increased as compared with the conventional case, and the removal efficiency of dust can be increased.
Moreover, by sucking the water in the sedimentation tank 2 with a strong suction flow of the drainage duct 5, the flow rate of the sieve wall passing through the bottom wall 4 can be increased, thereby enhancing the sieving effect.

Further, by supporting the bottom wall 4 so as to be movable up and down, the sieve of the bottom wall 4 is caused by water pressure that constantly fluctuates due to gravel, dust collision, dust accumulation and swirling flow, etc. The gravitational force that is vibrated (oscillated) and trapped on the sieve surface is always subjected to an inertia force in the vertical direction, so that gravel can be prevented from being caught in the sieve mesh.
In addition, after the operation is completed, when water is introduced from the inflow pipe 7 while draining water with the drain, the falling energy of the inflowing water can be converted into the bending energy of the spring, and when the inflow is stopped, the sieve starts damped vibration. Therefore, the mesh cleaning effect by backwashing can be obtained by the inertial force due to the damped vibration.

On the other hand, by providing an air supply device 14 that supplies bubbles from below to the opening 41 of the bottom wall 4 and generates turbulent flow near the center of the bottom wall 4, a thin plate shape that is collected in a vertical orientation by a swirling flow The waste 20 can be in a posture that can be easily sucked into the drainage duct 5 by turbulent flow, whereby the thin plate-like dust 20 that tends to settle can be sucked into the drainage duct 5 and discharged.
In addition, the air supply device 14 supplies air bubbles from below to the back surface of the bottom wall 4, so that dust attached to the screen of the bottom wall 4 can be lifted by the air blow effect during backwashing.

FIG. 8 shows a second embodiment of the operation method of the sand separation and cleaning apparatus of the present invention.
The sand separation and cleaning device includes a solid-liquid separation tank 1 into which dirty sand mixed water is introduced, and a sedimentation tank 2 installed under the solid-liquid separation tank 1.
The solid-liquid separation tank 1 is disposed at a cylindrical cylindrical wall 3 that generates a swirling flow that descends along the peripheral wall by allowing the sewage mixed water to flow in a tangential direction, and at the bottom of the cylindrical wall 3. Connected to a part of the circulation duct 11, a bottom wall 4 made of an inverted frustoconical sieve, a circulation duct 11 connecting the opening 41 of the bottom wall 4 and the upper part of the solid-liquid separation tank 1 And an ejector 12.
The operation method of the sand separating and cleaning apparatus of the present embodiment is as follows. In this sand separating and cleaning apparatus, the backwash pipe 18 is connected to the lower side of the sieve 3 from the driving water pump 22 of the jet pump 21 to introduce the contaminated sand mixed water. The sand process and the water supply back-washing process of supplying water through the backwash pipe 18 are alternately repeated at arbitrary times to adjust the sand concentration of the sewage-mixed water.
In FIG. 8, the same members as those in the first embodiment are designated by the same reference numerals, and the description thereof is omitted.

The sand separation and cleaning apparatus of the first embodiment described above is provided with an opening communicating with the settling tank 2 in the vicinity of the center of the bottom wall 4, so that the gravel pieces, glass pieces, etc. having the same specific gravity and weight as gravel are gravel. At the same time, there is a possibility of settling in the settling tank 2.
In this embodiment, the opening 41 at the center of the bottom wall is connected to the circulation duct 11 without communicating with the settling tank 2 as a means for removing dust at a higher level.
At this time, since dust and gravel accumulate on the sieve and the circulation duct 11, the inside of the solid-liquid separation tank 1 is recirculated by the ejector 12 every predetermined time, and the sieving operation is repeated. The gravel is pulled out of the tank from the branch pipe 13.
In addition, since it is necessary to isolate | separate gravel and waste on disposal, a gravel waste separator is required in a post process, but the upward flow type classifier etc. of a conventional product can be used for a gravel waste separator.
Gravel is collected in a container, etc., and waste is washed away with waste water and returned to the sand basin.

Thus, in the operation method of the sand separation and washing apparatus of the present embodiment, the dirty sand mixed water is introduced into the solid-liquid separation tank 1 in the tangential direction by the jet pump 21, and the dirty sand and waste are dispersed by the centrifugal force generated by the swirling flow. In the operation method of the sand separating and washing apparatus that separates the specific gravity and separates the particle size of sand and gravel by the inverted conical sieve 3, the backwash pipe is provided below the sieve 3 from the driving water pump 22 of the jet pump 21. 18 is connected, and the sand concentration process for introducing the sewage mixed water and the water supply backwash process for supplying water through the backwash pipe 18 are alternately repeated for an arbitrary time to adjust the sand concentration of the sewage mixed water. Therefore, even when the jet pump 21 unloads a large amount of sand at a time after heavy rain, etc., the sand-mixed water sand can be obtained by alternately repeating the sand-rolling step and the water supply back-washing step each time. The concentration can be adjusted for each site. More, it is possible to prevent the throughput over the sand separator cleaning device.
Moreover, a pump for backwashing becomes unnecessary, and it becomes possible to carry out sanding, sand collection, water supply and backwashing with one conventional driving water pump.

  In this case, the sand separation and cleaning device includes a solid-liquid separation tank 1 into which the waste sand mixed water is introduced, and a sedimentation tank 2 installed under the solid-liquid separation tank 1, and the solid-liquid separation tank 1 is From the cylindrical tube wall 3 that generates a swirling flow descending along the peripheral wall by flowing the mixed sand water in the tangential direction, and an inverted conical sieve disposed at the bottom of the tube wall 3 By providing the bottom wall 4, the circulation duct 11 that connects the opening 41 of the bottom wall 4 and the upper part of the solid-liquid separation tank 1, and the ejector 12 that is connected to a part of the circulation duct 11, Disperse dirt sand and waste by centrifugal force due to swirl flow and separate the specific gravity difference, and separate the particle size of sand and gravel by the sieve of the bottom wall 4 to dispose the waste having a large specific gravity near the center of the bottom wall 4 Gravel is collected, and the waste and gravel collected at regular intervals by the ejector 12 and the circulation duct 11 are separated into solid and liquid. Recirculates 1, by pulling the remaining dirt and gravel after the operation completes outside the tank, distinguished from potential gravel pieces or glass fragments to settle with gravel, it is possible to recover the sand only.

  As mentioned above, although the operating method of the sand separation washing | cleaning apparatus of this invention was demonstrated based on several Example, this invention is not limited to the structure described in the said Example, In the range which does not deviate from the meaning. The configuration can be changed as appropriate.

  The operation method of the sand separation and cleaning apparatus of the present invention prevents the sand separation and cleaning apparatus from exceeding its processing capacity by adjusting the sand concentration of the contaminated sand mixed water for each site. By doing so, it can be suitably applied to a sand separation and cleaning apparatus that is excluded from the object of industrial waste.

It is explanatory drawing which shows the Example of the operating method of the sand separation washing | cleaning apparatus of this invention. It is a chart figure which shows the driving | running method of the Example. The sand separation washing | cleaning apparatus used by the operation method is shown, (a) is the sectional drawing, (b) is the sectional view which supported the bottom wall elastically. It is a general view which shows the sand separation washing | cleaning apparatus. It is sectional drawing which shows the modification which provided the air supply apparatus in the sand separation washing | cleaning apparatus. It is sectional drawing which shows the modification which provided the backwashing nozzle in the air supply apparatus. It is explanatory drawing which shows the motion of the thin-plate-like refuse by a swirl flow and an upward flow. It is sectional drawing which shows the sand separation washing | cleaning apparatus used in 2nd Example of the operating method of the sand separation washing | cleaning apparatus of this invention.

Explanation of symbols

1 Solid-liquid separation tank 2 Sedimentation tank 3 Tube wall (sieving)
4 bottom wall 41 opening 5 drainage duct 6 separation hopper 61 overflow trough 7 inflow pipe 8 coil spring 9 screw conveyor 10 backwash nozzle (water supply device)
DESCRIPTION OF SYMBOLS 11 Circulation duct 12 Ejector 13 Branch pipe 14 Air supply device 15 Blower 16 Piping 17 Air diffuser nozzle 18 Backwash pipe 19 Backwash nozzle 20 Thin plate-shaped garbage 21 Jet pump 22 Drive water pump 23 Piping

Claims (3)

  Sediment sand mixed water is introduced tangentially into the solid-liquid separation tank by a jet pump, and the sand and dust are separated and separated by specific gravity by centrifugal force generated by swirling flow. In the operation method of the sand separation and cleaning device for separating the particle size of the sand, the backwash pipe is connected to the lower part of the sieve from the driving water pump of the jet pump, The method for operating the sand separating and cleaning apparatus is characterized by adjusting the sand concentration of the sewage mixed water by alternately repeating a water supply backwashing process for supplying water in an arbitrary time.   The sand separation and cleaning device includes a solid-liquid separation tank into which dirty sand mixed water is introduced, and a sedimentation tank installed under the solid-liquid separation tank, and the solid-liquid separation tank is sand tangent in a tangential direction. A cylindrical tube wall that generates a swirling flow descending along the peripheral wall by flowing mixed water, a bottom wall made of an inverted frustoconical sieve disposed at the bottom of the tube wall, and the bottom wall The operation method of the sand separation washing | cleaning apparatus of Claim 1 provided with the drainage duct which discharges | emits the water of the center vicinity of this outside.   The sand separation and cleaning device includes a solid-liquid separation tank into which dirty sand mixed water is introduced, and a sedimentation tank installed under the solid-liquid separation tank, and the solid-liquid separation tank is sand tangent in a tangential direction. A cylindrical tube wall that generates a swirling flow descending along the peripheral wall by flowing mixed water, a bottom wall made of an inverted frustoconical sieve disposed at the bottom of the tube wall, and the bottom wall The operation method of the sand separation washing | cleaning apparatus of Claim 1 provided with the circulation duct which connects the opening part of this and the upper part of a solid-liquid separation tank, and the ejector connected to a part of this circulation duct. .

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