JPH09136009A - Device for circulating and reusing waste water of sludge dehydrating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce amounts of waste water from a sludge dehydrating device to eliminate the need to use fresh water for washing a filter cloth in a device for circulating and reusing waste water discharged from a sludge dehydrating device by a method wherein particles in the waste water (suspended matter) are removed to circulate the waste water to reutilize it as filter cloth cleaning water for the sludge dehydrating device. SOLUTION: In a device for circulating and reusing waste water from a sludge dehydrating device as cleaning water in the device, at least one vertical hydro-cyclone 28 is connected to a waste water receiving tank 22 for storing waste water from a sludge dehydrating device and an outflow pipe from the cyclone 28 is connected tangentially to a cylindrical body 37 of a cylindrical cyclone 31 having particle discharge pipes 32, 33 in an axial direction and is connected to cleaning water nozzles 14, 15 through an outflow pipe connected to the body 37 in a tangential direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention removes particles (suspended substances) from wastewater of a sludge dewatering device, and supplies the separated water from which the particles have been removed to a wash water nozzle mainly as wash water for filter cloth of the sludge dewatering device. The present invention relates to a device for circulating and reusing wastewater of a sludge dehydrator.

[0002]

2. Description of the Related Art In the present invention, the sludge dewatering device includes all sludge dewatering devices such as a belt press and a filter press that discharge wastewater from the dewatering process and use water such as washing water in the dewatering process. It shall be.

One of the representative sludge dewatering devices for dewatering sludge generated from a wastewater treatment device is a belt press. As is well known, this belt press sandwiches sludge between two filter cloths, an upper filter cloth and a lower filter cloth, and runs between a plurality of rollers to apply pressure, and It is a sludge dewatering device that drains water and dewaters it.
In the belt press, since sludge adheres to the surface of the filter cloth and the texture of the filter cloth, it is necessary to spray the high pressure water to wash the filter cloth. The amount of water required to wash the filter cloth is very large, and generally 5 to 8 m ³ / hour is required per 1 m of the filter cloth width. For this reason, if a large amount of wastewater from the belt press is returned and allowed to flow into the wastewater treatment device, the load on the wastewater treatment device increases and the purification efficiency of the wastewater treatment device decreases, causing various problems.

Up to now, the wastewater of the belt press was put in a simple tank to precipitate large particles and the supernatant water of the tank was used as filter cloth washing water, or the wastewater of the sludge dewatering device was used for a fine screen or Attempts were made to remove large particles through a strainer and use the effluent water as filter cloth washing water. However, if the pressure of the washing water is set to 5 to 6 kg / cm ² and the washing water is sprayed onto the filter cloth to wash the filter cloth, the sludge adhering to the filter cloth cannot be sufficiently removed and washed. Therefore, in order to reduce the amount of water sprayed from the wash water nozzle, a wash water nozzle having a diameter of the wash water nozzle or a width of an opening of the wash water nozzle is usually about 1 mm. Since the diameter of the washing water nozzle or the width of the opening of the washing water nozzle is very small as described above, the washing water nozzle is easily clogged with particles. Therefore, clean water that does not contain particles (suspended substances) is used as the wash water. Therefore, not only is the operating cost of the sludge dewatering device increased, but the wastewater of the sludge dewatering device must be returned to the wastewater treatment device for reprocessing, which increases the load on the wastewater treatment device. The amount of washing water for the filter cloth of the sludge dewatering device is generally about 5 to 8 m per 1 m of the filter cloth width.
Since about ³ / hour is required, the increase in the load on the wastewater treatment device due to the drainage of the sludge dewatering device is extremely large especially in the case of a medium / small-scale wastewater treatment device or an advanced treatment device using ultrafiltration or activated carbon filtration. It is a serious problem.

Further, the waste water of the belt press is put in a simple tank to precipitate large particles and the supernatant water of the tank is used as filter cloth washing water, or the waste water of the sludge dewatering device is used as a fine screen or a strainer. Conventional methods and devices such as removing large particles through the filter and using the effluent as filter cloth wash water cannot sufficiently remove particles in the wastewater, and the wash water nozzle is constantly clogged. So, in practice, it could not be used continuously without constant maintenance.

That is, until now, there has been no effective and economical device for circulating and reusing the waste water of the sludge dewatering device as the filter cloth washing water.

[0007]

In order to achieve the above object, the present invention has various improvements as follows.

That is, the sludge dewatering is performed by connecting the drainage receiving tank for containing the drainage from the sludge dewatering device to the washing water nozzle via at least one vertical hydrocyclone and at least one cylindrical cyclone connected in series. A device was constructed to circulate and reuse the wastewater from the device as washing water in the sludge dewatering device.

In the above, the cylindrical cyclone comprises a cylindrical body having a substantially circular cross section, a first separated water outflow pipe and a second separated water outflow pipe attached to the cylindrical body in a tangential direction, and an axial direction attached to the cylindrical body. It consists of only one or two particle discharge pipes. The cylindrical cyclone may have a structure in which the cylindrical side opening of the particle discharge pipe is inserted into the cylindrical body and a funnel-shaped take-out portion is attached to one or both of the openings. Also, a flow rate control valve can be provided in the second separated water outflow pipe.

Further, a gas mixing means can be interposed in the first separated water outflow pipe connecting the vertical hydrocyclone and the cylindrical cyclone.

[0011]

[Advantage] By adopting the above-mentioned structure, the vertical hydrocyclone removes all particles in the drainage water from the dehydrator that have a higher specific gravity than the water and cause clogging of the wash water nozzle. You can

[0012] Usually, depending on the type of sludge to be dewatered, particles having a smaller specific gravity than many water such as small plastic pieces, wood pieces and fibers are contained in the wastewater of the sludge dewatering device, and the particles having a specific gravity smaller than those of water are contained. Although light particles cannot be removed by the vertical hydrocyclone, a cylindrical cyclone is connected in series to the vertical hydrocyclone, and the effluent water from the vertical hydrocyclone, that is, the first
By introducing separated water into the cylindrical cyclone,
It is possible here to remove these particles, which have a lower specific gravity than water.

Thus, the outflow water from the cylindrical cyclone, that is, the second separated water from which all the particles that cause clogging of the wash water nozzle in the wastewater of the sludge dewatering device are removed, is guided in series to the wash water nozzle. , Reused as filter cloth washing water.

According to the cylindrical cyclone of the present invention, the vertical hydrocyclone is connected to the cylindrical body having a substantially circular cross section through the first separated water outflow pipe tangentially attached to the cylindrical body. Since effluent water, that is, the first separated water, flows in, a vortex is generated in the cylindrical body,
Particles having a lower specific gravity than water gather in the center of the cylinder, while water from which particles having a lower specific gravity than water have been removed gathers near the peripheral wall of the cylinder due to the centrifugal force of the vortex and is tangential to the cylinder. It will flow out through the attached second separated water outflow pipe. Then, the particles having a lower specific gravity than water gathered in the central portion of the cylindrical body are removed through one or two particle discharge pipes which are axially attached to the cylindrical body.

Here, in the cylindrical body of the cylindrical cyclone, the pressure at the central portion of the cylindrical body becomes lower than that in the vicinity of the peripheral wall of the cylindrical body due to the vortex flow generated by the inflow of the first separated water. That is, the pressure in the central portion of the cylindrical cyclone becomes lower than the pressure of the inflow water from the vertical hydrocyclone, that is, the first separated water and the outflow water from the cylindrical cyclone, that is, the second separated water. On the other hand, in order to remove particles having a smaller specific gravity than water collected in the center of the cylindrical body by the vortex flow through the particle discharge pipe, at least the pressure in the center of the cylindrical cyclone is the outlet side pressure of the particle discharge pipe, that is, Must be higher than atmospheric pressure. So, the outflow of the cylindrical cyclone,
That is, by providing a flow rate control valve in the second separated water outflow pipe, the outflow amount of the second separated water is adjusted, the resistance on the outflow side is increased, and the pressure in the central portion of the cylindrical cyclone is made higher than atmospheric pressure,
Particles having a lower specific gravity than water can be efficiently removed from the central portion of the cylindrical body through the particle discharge pipe.

Further, when a gas mixing means is interposed in the first separated water outflow pipe connecting the vertical hydrocyclone and the cylindrical cyclone, the bubbles mixed in the first separated water have particles having a specific gravity smaller than that of water. Since the particles adhere to the surface of the cylindrical cyclone and are more easily collected in the central portion of the cylindrical cyclone, the removal of particles having a specific gravity smaller than that of water can be promoted.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A device for circulating and reusing wastewater from a sludge dewatering device as washing water in the sludge dewatering device, wherein at least one vertical drainage receiving tank 22 for containing the wastewater from the sludge dewatering device is used. Connect in series to the hydrocyclone 28, where particles with a higher specific gravity than water are removed,
Outflow water from the vertical hydrocyclone 28 from which particles having a higher specific gravity than water, that is, the first separated water, is applied to at least one cylindrical cyclone 31 connected in series to the vertical hydrocyclone 28 to the cylindrical cyclone 31. From the tangential direction of the cylindrical body 37 that constitutes the first separated water inflow pipe 39
b through the cylindrical body 37.
Generated by the centrifugal force of the vortex, water containing particles having a smaller specific gravity than water is separated into the central portion of the cylindrical body 37, and water from which the particles have been removed is separated into the vicinity of the inner peripheral wall of the cylindrical body 37. Water containing particles having a lighter specific gravity is discharged through particle discharge pipes 32 and 33 axially attached to the center of the side wall of the cylindrical body 37, while water from which particles having a lighter specific gravity are removed is removed. A circulation reuse device for wastewater of a sludge dewatering device, characterized in that the second separated water is tangentially attached to an outflow pipe 39c attached to the cylindrical body 37 and is connected to the wash water nozzles 14 and 15.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view briefly showing the most general structure and operation of a belt press type sludge dewatering device used for dewatering sludge.

The sludge in which flocculant is added by adding the flocculant is first fed into the feed box 1 and supplied onto the lower filter cloth 2. The free water in the sludge flocs falls through the texture of the lower filter cloth 2 in this feed box 1 and enters the pan 4. The lower filter cloth runs in the direction of the arrow 3A, and the sludge is sent to the wedge-shaped pre-compression zone 5 formed by the lower filter cloth 2 and the upper filter cloth 6, in which the sludge is gently compressed. Of the free water is further discharged into the pan 13. The upper filter cloth 6 runs as indicated by the arrow 3B. And top and bottom 2
The sludge sandwiched between the pieces of filter cloth then passes around the plurality of compression rollers 7 and 8, where pressure is applied to the sludge by the tension of the filter cloth, and water is squeezed out from the sludge. The water squeezed out by the action of these compression rollers 7 and 8 is
Enter the bread 13. Next, the sludge travels around rollers 9, 10 equipped with scrapers 11 and 12, and at this time, the dehydrated sludge, that is, the dehydrated cake on the surfaces of the upper and lower filter cloths is peeled off by the scrapers 11 and 12.

Although the scrapers 11 and 12 can remove the dehydrated cake on the surface of the filter cloth, they cannot remove sludge firmly adhered to the surface of the filter cloth or sludge that has entered the texture of the filter cloth. Can not. The sludge adhering to these filter cloths must be removed before the filter cloths return to the feed box 1 and are fed again onto the filter cloths. For this reason, the upper and lower filter cloths are cleaned by washing with high pressure water. This cleaning is performed by the upper filter cloth cleaning water nozzle 1 having a plurality of nozzles.
Lower filter cloth wash water nozzle with 5 and multiple nozzles 1
From 4, the high-pressure water is usually sprayed onto the back surfaces of the upper and lower filter cloths.

The cleaning waste water is collected in the pan 16 and the pan 17 and discharged. The diameter of the washing water nozzle or the size of the width of the opening of the washing water nozzle is usually about 1 mm, and the pressure of the washing water is usually about 5 to 6 kg / cm ² . Since the diameter of the wash water nozzle or the width of the opening of the wash water nozzle was very small as described above, the wash water nozzle was easily clogged with particles.

FIG. 2 shows a conventional belt press type sludge dewatering device shown in FIG. 1 in which a device for circulating and reusing wastewater from the sludge dewatering device according to the present invention as washing water in the sludge dewatering device. It is explanatory drawing showing an Example.

Breads 4, 13, 1 shown in FIG.
The waste water of the sludge dewatering device collected at 6, 17 enters the waste water receiving tank 22 shown in FIG. 2 by the drain pipes 18, 19, 20, 21 respectively shown in FIG. FIG. 2 shows the pan 13 and the drain pipe 1 for ease of explanation.
The description of 9 is omitted. In addition, the first free water in the sludge flocs entering the bread 4 from the feed box 1 has a relatively large amount of water, and is usually another bread, that is, the bread 1.
It is relatively cleaner than the wastewater entering 3, 16 and 17. Therefore, among the wastewater from the other pans, the wastewater that is extremely dirty, for example, the wastewater collected in the pan 13 is not put into the drainage receiving tank 22, and the drainage pipe 19 is discharged as a separate system and directly returned to the wastewater treatment device. it can. The drainage receiving tank 22 may be provided with a hopper 24 so that large sludge particles can be settled. In this case, the settled sludge can be discharged by the valve 26.

Pump 2 for drainage from the drainage receiving tank 22 with a pipe 25
7 and then the waste water is pumped to a vertical hydrocyclone 28, where particles having a higher specific gravity than the liquid are removed.
The removed particles are discharged from the lower part of the vertical hydrocyclone 28. When the storage container 29 is provided below the vertical hydrocyclone 28, the removed particles are collected in the main storage container 29. The valve 30 is intermittently, for example, 30-
When opened for 60 seconds for a few seconds, the removed particles are discharged from the vertical hydrocyclone 28 as highly concentrated sludge.
This sludge can be mixed with the sludge flowing into the feed box 1 and dehydrated again.

Excess water in the drainage receiving tank 22 overflows from the pipe 23 and is returned to the wastewater treatment device. When using the device of the present invention, the wastewater returned to the wastewater treatment device,
In principle, there is only excess water from this drainage receiving tank 22. Therefore, as compared with the conventional belt press type sludge dewatering device, the amount of wastewater returned to the wastewater treatment device is significantly reduced, and the load on the wastewater treatment device is significantly reduced.

FIG. 3 schematically shows the internal structure of the vertical hydrocyclone 28 used in the present invention. This vertical hydrocyclone 28 is conventionally known, and usually has an inner diameter of 80 mm to 100 mm.
It is possible to use a medium size.

The wastewater flowing from the pump 27 into the vertical hydrocyclone 28 through the inflow pipe 40 rotates at high speed in the cyclone, and particles heavier than water gather at the bottom of the cone 38.
Next, it is collected in the storage container 29. The first separated water from which particles having a higher specific gravity than water are removed, that is, the outflow water of the vertical hydrocyclone 28 flows out from the outflow pipe 39a as indicated by an arrow 41, and is connected to the downstream side of the outflow pipe 39a. The separated water flows into the cylindrical cyclone 31 via the inflow pipe 39b.

Vertical cone 38 of hydrocyclone 28
Is 10 to 20 °, and the smaller the cone angle α, the better the particle removal effect.

When the vertical hydrocyclone 28 and the cylindrical cyclone 31 were used to treat the wastewater of the sludge dewatering equipment of the metal surface treatment plant, the state of particles contained in the treated water was measured and the results are as follows. Became.

Pressure (kgf / cm ² ) 3.0 Flow rate (m ³ / hour) 7.0 SS (mg / liter) Raw water 516 Treated water 101 Sludge 54,600 Particle size (mm) Raw water 2.0 (maximum) ) 0.8 (average) Treated water 0.05 (maximum) 0.02 (average) In this measurement, the angle α of the cone 38 is 12 °, and the vertical hydrocyclone with a cyclone diameter of 80 mm and the diameter of the cylinder are 80 m.
m using a cylindrical cyclone.

Particles having a lower specific gravity than water contained in the wastewater of the sludge dewatering apparatus are removed by the cylindrical cyclone 31. The cylindrical cyclone 31 used in the present invention is a new invention, and FIG. 4 shows the internal structure thereof. From the viewpoint of economy, it is preferable that the size of the cylindrical cyclone 31 is approximately the same as the size of the normal vertical hydrocyclone 28.

The cylindrical cyclone 31 shown in FIG. 4 has a cylindrical body 37 having a substantially circular cross section, a first separated water inflow pipe 39b tangentially connected to the cylindrical body 37, and the cylindrical body 3 as well.
7, an outlet pipe 39c that is connected tangentially to take out the second separated water from which particles having a lower specific gravity than water have been removed, and one or two particle discharge pipes 32 to take out particles having a lower specific gravity than the removed water, It is composed of 33.

In this cylindrical cyclone 31, an inflow pipe 39b of the first separated water and an outflow pipe 39c of the second separated water are attached tangentially to the cylindrical body 37, respectively, and the particle discharge pipe 3
It is a necessary and sufficient condition that 2, 33 are attached to the central portion of the side wall of the cylindrical body 37 from the axial direction. Therefore, it does not matter whether the cylindrical body 37 is installed in the horizontal direction or the vertical direction. For example, the cylindrical body 37 is installed vertically, and the inflow pipe 39b is located on the upper side of the cylindrical body 37 and the outflow pipe 39b.
When c is attached to the lower side of the cylindrical body 37, conversely, the inflow pipe 39b may be attached to the lower side of the cylindrical body 37 and the outflow pipe 39c may be attached to the upper side of the cylindrical body 37. Further, even when the cylindrical body 37 is installed substantially horizontally as shown in FIG. 4 and both the inflow pipe 39b and the outflow pipe 39c are attached to the upper portion of the cylindrical body 37, the inflow pipe 39b is not shown in FIG.
Even when the upper portion of the cylindrical body 37 and the outflow pipe 39c are attached to the lower portion of the cylindrical body 37 unlike in FIG.
Alternatively, unlike in FIG. 4, the inflow pipe 39b may be attached to the lower portion of the horizontally arranged cylindrical body 37, and the outflow pipe 39c may be attached to the upper portion of the cylindrical body 37 as shown in FIG. The point is that it is sufficient if the first separated water that has entered the cylindrical body 37 from the inflow pipe 39b can generate a vortex in the cylindrical body 37. However, according to the experiment, it was found that the cylindrical cyclone 31 was installed horizontally rather than vertically, as the particle removal efficiency was better.

The outflow water of the vertical hydrocyclone 28 that has entered the cylindrical body 37 of the cylindrical cyclone 31 from the inflow pipe 39b, that is, the first separated water, is because the inflow pipe 39b is attached tangentially to the cylindrical body 37. , Rotates at high speed in the cylindrical body 37. Particles having a lower specific gravity than water are
Gather in the center of 7. The particles having a lower specific gravity than water collected in the central portion of the cylindrical body 37 are discharged from the cylindrical cyclone 31 by the particle discharge pipes 32 and 33 on the central axis of the cylindrical body 37. The particle discharge pipe is a cylindrical body 3 as shown in FIG.
It may be provided on both sides of 7, but may be provided on only one of them. Although the particle discharge pipes 32 and 33 are inserted into the cylindrical body 37 and the extending distance can be appropriately determined, water containing particles having a smaller specific gravity than water collected in the central portion due to the vortex flow generated in the cylindrical body 37 is used. So that it can be discharged efficiently
It is preferable that the cylindrical body 37 does not extend so deeply and is opened near the side wall of the cylindrical body 37.

The inner diameters of the particle discharge pipes 32 and 33 must be made small so that the amount of discharged water does not become too large. However, the center of the vortex inside the cylindrical body 37 does not completely coincide with the center of the axis of the cylindrical body 37, and it is usually about 2 times the diameter of the cylindrical body 37.
It constantly fluctuates in the range of 5%. Therefore, the particle discharge pipe 3
It is preferable to attach a funnel-shaped inlet 42 having a size of about 25% of the diameter of the cylindrical body 37 to both and / or 2, 33. The particle discharge pipes 32 and 33 are axially attached to the central portion of the side wall of the cylindrical body 37, and
The side opening is inserted into the cylindrical body 37. To facilitate collecting and discharging water containing particles lighter than water through the particle discharge pipes 32 and 33, a funnel-shaped inlet 42 can be attached to the tip of the opening on the cylindrical body 37 side.
As shown in FIG. 4, the particle discharge pipes may be provided on both side walls of the cylindrical body 37, or may be provided only on one of them. Further, the funnel-shaped inlet 42 provided in the opening of the particle discharge pipes 32, 33 on the side inserted into the cylindrical body 37 may be provided in only one of the openings as shown in FIG. 4, or in both openings. It may be provided.

On the other hand, the water from which particles having a smaller specific gravity than water are removed by the centrifugal force due to the eddy current generated in the cylindrical body 37 of the cylindrical cyclone 31 gathers near the inner peripheral wall of the cylindrical body 37 and is tangential to the cylindrical body 37. The water is discharged as second separated water through the outflow pipe 39c attached from the.

The central portion of the cylindrical cyclone 31 is the cylindrical body 3
Since a vortex flow is generated within 7, the pressure becomes lower than the inflow water from the vertical hydrocyclone 28, that is, the first separated water and the outflow water from the cylindrical cyclone 31, that is, the second separated water. On the other hand, in order to take out water containing particles having a specific gravity smaller than that of water collected in the central portion of the cylindrical body 37 of the cylindrical cyclone 31 through the particle discharge pipes 32 and 33, the pressure in the central portion of the cylindrical cyclone 31 is It must be higher than the outlet side pressure of the discharge pipes 32 and 33, that is, the atmospheric pressure. Therefore, by providing the flow rate adjusting valve 35 on the outflow pipe 39c for flowing the water flowing out from the cylindrical cyclone 31, that is, the second separated water, the outflow amount of the second separated water is adjusted and the resistance on the outflow side is increased. It is effective to make the pressure at the center of the cylindrical cyclone 31 higher than atmospheric pressure.

Further, the particle removing ability of the cylindrical cyclone 31 for removing particles having a specific gravity lower than that of water is improved by mixing fine bubbles in the inflow water (first separated water). in this case,
For example, when the ejector 34 is attached to the inflow pipe 39b, air can be mixed into the inflow water (first separated water) into the cylindrical cyclone 31 as shown by the arrow 43 (FIG. 2). The mixed bubbles adhere to the particles having a lower specific gravity than water, and the action of collecting the particles in the central portion of the cylindrical cyclone 31 is further improved.

According to the above-mentioned actual measurement, the cylindrical cyclone 3
The diameter of the particles contained in the second separated water flowing out from No. 1 was 0.02 mm on average and 0.05 mm at maximum. As described above, since the washing water nozzles 14 and 15 have a nozzle diameter of about 1 mm, there is no possibility that the nozzles of the washing nozzles 14 and 15 will be clogged with water that has passed through the vertical hydrocyclone 28 and the cylindrical cyclone 31.

The second separated water flowing out from the cylindrical cyclone 31 through the outflow pipe 39c passes through the flow rate control valve 35 and enters the treated water storage tank 36. Then, the second separated water is pressure-fed to the cleaning nozzles 14 and 15 by the cleaning water pump 37 and circulated and reused as cleaning water for the filter cloth. A strainer 44 may be attached to the treated water storage tank 36 in case there is a particle having the same specific gravity as water.

As described above, in this embodiment, the drainage receiving tank 2
The vertical hydrocyclone 28 and the cylindrical cyclone 31 are respectively provided in series between 2 and the washing water nozzles 14 and 15, but a plurality of them may be provided in series or in parallel if necessary. Is.

[0043]

EFFECTS OF THE INVENTION According to the apparatus for circulating and reusing wastewater of the sludge dewatering apparatus of the present invention, particles which may clog the wash water nozzle can be completely removed from the wastewater of the sludge dewatering apparatus. The effect of is obtained.

A. Since the particles in the waste water of the sludge dewatering device can be removed and reused as washing water for the filter cloth, it is not necessary to use fresh fresh water as washing water, which is a significant economic effect.

B. Since the amount of wastewater from the sludge dewatering treatment device that is returned to the wastewater treatment device and retreated is significantly reduced, it is possible to solve the serious problem that the load on the wastewater treatment device increases. C. Vertical hydrocyclones and cylindrical cyclones that remove particles from wastewater are very compact and inexpensive, so they can be installed in small sludge dewatering devices.

Furthermore, since the two cyclones are compact and small in size, they can be mounted next to the frame of a sludge dewatering machine, and usually no special large space is required for these cyclones.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing the structure and operation of a conventional belt press type sludge dewatering device.

FIG. 2 is an explanatory view showing the structure and action of a belt press type sludge dewatering device incorporating a circulation and reuse device for wastewater of the sludge dewatering device according to the present invention.

FIG. 3 is a sectional view simply showing the internal structure of a vertical hydrocyclone.

FIG. 4 is a perspective view showing a cylindrical cyclone.

[Explanation of symbols]

 1 Feed Box 2 Lower Filter Cloth 4, 13, 16, 17 Pan 6 Upper Filter Cloth 7, 8 Compression Roller 9, 10 Roller 11, 12 Scraper 14 Lower Filter Cloth Wash Water Nozzle 15 Upper Filter Cloth Wash Water Nozzle 18, 19, 20, 21 Drain pipe 22 Drain tank 24 Hopper 28 Vertical hydrocyclone 31 Cylindrical cyclone 32, 33 Particle discharge pipe 34 Ejector 35 Flow control valve 36 Treated water storage tank 37 Cylinder 38 Cone 39a, 39c Outflow pipe 39b Inflow pipe 42 Funnel Entrance

Claims (5)

[Claims] 1. A device for circulating and reusing wastewater from a sludge dewatering device as washing water in the sludge dewatering device, wherein at least one drainage receiving tank containing the wastewater from the sludge dewatering device is connected in series. A drainage circulation reuse device for a sludge dewatering device, which is connected to a washing water nozzle via a vertical hydrocyclone and at least one cylindrical cyclone. 2. A cylindrical cyclone, a cylindrical body having a substantially circular cross section, a first separated water outflow pipe and a second separated water outflow pipe attached tangentially to the cylindrical body, and an axial direction attached to the cylindrical body. The sludge dewatering apparatus according to claim 1, wherein the sludge dewatering apparatus is configured to include one or two particle discharge pipes. 3. The sludge dewatering device according to claim 2, wherein the cylindrical side opening of the particle discharge pipe is inserted into the cylindrical body, and a funnel-shaped take-out portion is attached to one or both of the openings. Circulation reuse equipment for wastewater. 4. The circulation reuse device for wastewater of a sludge dewatering device according to claim 2, wherein a flow rate control valve is attached to the second separated water outflow pipe. 5. The circulation reuse of wastewater of a sludge dewatering device according to claim 2, wherein a gas mixing means is interposed in the first separated water outflow pipe connecting the vertical hydrocyclone and the cylindrical cyclone. apparatus.