JPH06304797A - Sludge dehydrator - Google Patents

Abstract

PURPOSE:To provide a sludge dehydrator equipped with a filter cloth belt with a long life, and possible to prevent deterioration in a filter capacity by constructing so that various rollers and sludge come into contact with both surfaces of the filter cloth belt alternately. CONSTITUTION:An endless filter cloth belts 3 and 4 manufactured by twisting a filter cloth belt member by 180 deg., and connecting its both ends are used. Sludge 1 is shear dehydrated by a shear dehydrating part S between the endless filter cloth belts 3 and 4, and peeled off after becoming a dehydrated cake 10. The endless filter cloth belts 3 and 4 are guided by reversing guide rollers 21, and are reversed, and a surface opposite to the surface of a filter cloth belt coming into contact with the sludge 1, comes into contact with the following sludge 1. It follows that the sludge 1 and various rollers 6, 7, 8 and 14 come into contact with the front side and the rear side of the filter cloth belt surface alternately, and the damage of the endless filter cloth belts 3 and 4, is remarkably reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge dewatering device for continuously dewatering sludge generated in water treatment of sewage, industrial wastewater and other water treatment.

[0002]

2. Description of the Related Art A sludge dewatering device in which two endless filter cloth belts are movably mounted on a plurality of roller groups in a face-to-face overlapping state, and sludge is sandwiched between these filter cloth belts for pressure dehydration. There are various types. In particular, in recent years, a sludge dewatering device, which has a shear dewatering unit including a plurality of shear rollers in addition to the pressure dewatering unit, has been attracting attention. These sludge dewatering devices further improve the dewatering effect by applying a shearing force by a shear roller to the sludge dewatered under pressure between the filter cloth belts to perform shear dewatering.

Examples of the above-mentioned sludge dewatering device include those disclosed in Japanese Examined Patent Publication No. 64-3600 and Japanese Utility Model Publication No. 2-34000. As shown in FIG. 11, in the conventional sludge dewatering device, an endless filter cloth belt 53 that receives the supply of the sludge 51 from the supply unit 52 and an endless filter cloth belt 54 that does not receive the supply of the sludge 51, The driving roller 56 connected to the driving device 55 and rotating at the same speed and a plurality of roller groups 57 are mounted so as to be able to run in parallel in a face-to-face overlapping state. The sludge 51 is pressurized and dehydrated by a pressure roller 58 provided opposite to the overlapping portion of the filter cloth belts 53 and 54, and further with a sun roller 63 provided on the downstream side in the traveling direction of the filter cloth belts 53 and 54. Shear dewatering is performed in a shear dewatering unit S including a plurality of planetary rollers 64. Then, the dehydrated cake 60 obtained by the shear dehydration is the pressing roller 59.
And the filter cloth belts 53 and 54 are separated from each other,
It separates from the filter cloth belts 53 and 54 and falls on the conveyor 61. Further, after the sludge is peeled off, the filter cloth belts 53 and 54 to which the sludge 51 is attached are washed by the washing device 62 in order to prevent the deterioration of the filtering ability.

[0004]

However, the conventional filter cloth belts 53, 5 used in the above sludge dewatering device.
No. 4 is an endless filter cloth belt produced by connecting both ends A, C and B, D of a belt-shaped filter cloth belt member as shown in FIG. 12, and therefore has the following problems. First, both of the filter cloth belts 53 and 54 are in contact with the roller surfaces of the drive roller 56, the roller group 57 and the pressure roller 58 only on one side, that is, on the inner side surface, and further, the pressing roller 59 and the planetary roller 64.
It is also the inner surface of the filter cloth belts 53, 54 that they contact.
In this way, only the inner side surfaces of the filter cloth belts 53, 54 come into contact with the various rollers, so the filter cloth belts 53, 5
Only one of the inner surfaces of 4 wears due to contact with the roller,
Since the roller rotation is not smooth, excessive friction is likely to occur, and the filter cloth belt is liable to be damaged, damaged, cut, etc., resulting in a short service life of the filter cloth belt.

Further, since the filter cloth belts 53 and 54 are in contact with the sludge 51 only on the outer surface, the filtrate always flows from the outer surface to the inner surface of the filter cloth during dehydration. However, there is a problem in that the suspended matter, organic matter, and heavy metals are easily accumulated inside the filter cloth, and the filtration ability is apt to decrease.

As described above, in the conventional sludge dewatering device, various rollers come into contact with only the inner surface of the filter cloth belt, and sludge comes into contact with only the outer surface of the filter cloth belt. In the conventional sludge dewatering device, it has been a problem to configure various rollers and sludge so as to contact both surfaces of the filter cloth belt.

Therefore, an object of the present invention is to solve the above-mentioned problems, and a pair of filter cloth belts is used to press sludge between the filter cloth belts for dewatering, and in particular, each filter cloth belt. Both sides of the filter cloth are sequentially repeated to make it the surface in contact with sludge so that both surfaces of the filter cloth belt can be used for dewatering, thereby extending the service life of the filter cloth belt and preventing the deterioration of the filtration capacity of filtration dewatering. The present invention is to provide a sludge dewatering device.

[0008]

In order to achieve the above object, the present invention is configured as follows. That is, according to the present invention, a pair of endless filter cloth belts which are respectively movably mounted on a plurality of rollers and endlessly connected in a state of being inverted 180 degrees on the way, and a part of the endless filter cloth belts are mutually connected. A shearing dewatering part formed between the endless filter cloth belts by face-to-face polymerization and a shearing dewatering part between the filter cloth belts are clamped to the running sludge to give shearing force to the sludge for shearing dewatering. Multiple shear rollers,
The present invention relates to a sludge dewatering device having:

In this sludge dewatering device, the endless filter cloth belt which is turned 180 degrees is constructed by turning one filter cloth belt member 180 degrees halfway and connecting both ends.

[0010]

The sludge dewatering device according to the present invention is constructed as described above, and therefore operates as follows. That is, this sludge dewatering device applies the principle of an endless belt in which both ends are connected by twisting the filter cloth belt unit once, that is, the Mobius strip principle. As shown in FIG. 1, the filter cloth belt unit using the Mobius strip principle twists or inverts one end A, B and the other end C, D of the filter cloth belt unit by 180 degrees, that is, D becomes A. , C is a curved surface in which both ends are overlapped and connected so that C overlaps B, and the curved surface as a whole has no distinction between front and back.

That is, when it is transmitted along the center line of one surface of the filter cloth belt unit, it makes one round and reaches the opposite surface,
If you make another turn, you will return to the original surface. When such a filter cloth belt is used, the filter cloth surface of the filter cloth belt is not flush with the front and back, and the surface contacting various rollers such as a driving roller, a roller group, a pressure roller, or a squeezing roller and a planetary roller is In the case of the conventional filter cloth belt, which has been referred to as the inner surface and the outer surface, both surfaces are formed, and the surface damage of the filter cloth belt can be significantly reduced.

Further, since the surface contacting the sludge corresponds to both the front surface and the back surface of the conventional filter cloth surface, the filtrate should flow alternately from one surface to the other surface of the filter cloth during dehydration. Therefore, turbidity components, organic substances, and heavy metals in the filtrate are less likely to be accumulated inside the filter cloth, and the filtering ability is less likely to decrease. Therefore, the contamination of the filter cloth surface of the filter cloth is greatly reduced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A sludge dewatering device according to the present invention will be described below with reference to the drawings. 1 to 10 show an embodiment of a sludge dewatering device according to the present invention. 1 to 3 are explanatory views showing a manufacturing process of a filter cloth belt, FIG. 1 is a front view showing a rectangular band used for manufacturing the filter cloth belt, and FIG. 2 is a case where the rectangular band is twisted by 180 degrees. And FIG. 3 is a perspective view of the completed filter cloth belt.
The filter cloth belt used in the sludge dewatering device of the present invention is made of band-shaped filter cloth belt members 3F and 4F as shown in FIG. That is, as shown in FIG. 2, the filter cloth belt member 3
The F and 4F are twisted by 180 degrees, that is, inverted, and the filter cloth belt members 3F and 4F are overlapped so that the point D and the point C of the ends overlap with the point A and the point B, respectively, as shown in FIG. The filter cloth belts 3 and 4 are manufactured by overlapping and connecting the sides of both ends.
The filter cloth belts 3 and 4 have a curved surface to which the principle called Mobius strip is applied. When the filter cloth belts 3 and 4 proceed along the center line, they make one turn and return to their original positions. It will reach the surface on the opposite side of and will return to the surface of the original position when it makes another turn. By utilizing the above principle, the filter cloth belts 3 and 4 can be used as a curved surface having no distinction between the front surface and the back surface.

FIG. 4 is an explanatory view showing an embodiment of the sludge dewatering device according to the present invention. The endless filter cloth belt 3 that receives the supply of the sludge 1 from the supply unit 2 and the endless filter cloth belt 4 that does not receive the supply of the sludge 1 are connected to a drive device 5 and are driven by a drive roller 6 and a drive roller 6 that rotate at the same speed. Multiple roller group 7
The two are mounted so that they can run in parallel while facing each other.

A pressure roller 8 is provided so as to face the filter cloth belts 3 and 4 at the superposition section where the filter cloth belts 3 and 4 are face-to-face polymerized. In addition, in the overlapping portion where the filter cloth belt 3 and the filter cloth belt 4 are face-to-face overlapped with each other, following the pressure roller 8, a shearing dehydration section including a sun roller 13 and a plurality of planetary rollers 14 as shearing rollers. S is deployed. The polymerized filter cloth belt 3 and the filter cloth belt 4 are hooked on the shearing / dewatering section S and then on the pressing roller 9. After passing through the pressing roller 9, the filter cloth belt 3 and the filter cloth belt 4 are separated into two hands, in which case the dehydrated cake 10 is separated from the filter cloth belts 3 and 4 and drops onto the conveyor 11. After the dehydrated cake 10 is separated from the filter cloth belts 3 and 4, the filter cloth belts 3 and 4 are cleaned by the cleaning device 12, respectively.

The structure of the shear dewatering section S is as shown in FIGS. 5 and 6 (see Japanese Patent Publication No. Sho 64-3600).
The sun roller 13 and a plurality of planet rollers 14 mounted on the sun roller 13
Both ends of the rotary shaft 15 of the sun roller 13 are rotatably held by the frame 16. Both the sun roller 13 and the planetary roller 14 are rotatably supported by a circular support member 17 having a gear formed on the outer circumference. The outer peripheral gear portion of the support member 17 meshes with a pinion gear 20, and the pinion gear 20 rotates integrally with a chain wheel 18 that is connected to a variable speed motor (not shown) via a chain 19. That is, the support member 17 is rotated by the variable speed motor via the chain wheel 18 and the pinion gear 20, and the planetary roller 14 revolves with respect to the sun roller 13 in accordance with the rotation.

As shown in FIG. 4, the filter cloth belt 3 has the filter cloth belt 3 inverted by 180 degrees on the way,
The reversing part of is located between the drive roller 6 and the supply part 2 of the sludge 1. An inversion guide roller 21 is provided in order to make the inversion of the filter cloth belt 3 smooth. The reversing guide rollers 21 are arranged along the traveling direction with the filter cloth belt 3 sandwiched from both sides, and guide and hold the vertical state and the inclined state for reversing the filter cloth belt 3. The filter cloth belt 3 cleaned by the cleaning device 12 contains a large amount of cleaning water, but by squeezing the filter cloth belt 3 with the reversing guide roller 21, the drainage of the filter cloth belt 3 is easily performed.
Therefore, the reverse guide roller 21 is also referred to as a water draining roller. Since the filter cloth belt 3 is oriented vertically in the inverted portion, the water exposed from the filter cloth belt 3 is smoothly drained downward and collected in the draining tray 22. As for the other filter cloth belt 4, a reverse guide roller 21, that is, a water draining roller 21, is provided in the reverse portion thereof, as in the case of the filter cloth belt 3.

Inversion guide roller 21 having a draining function
For example, as shown in FIGS. 7, 8 and 9. The reversing guide roller 21 shown in FIG. 7 is a general roller having a smooth roller surface, and the pair of reversing guide rollers 21 presses the filter cloth belts 3 and 4 to dewater sludge. Inversion guide roller 21 shown in FIG.
Is a drainage groove 23 on the roller surface in the vertical direction or the inclined direction.
And a pair of reversing guide rollers 21.
The filter cloth belts 3 and 4 are squeezed to dewater the sludge. These draining grooves 23 may have a linear shape, a curved shape, or a grid shape. If a passage through which the cleaning water exposed from the filter cloth belts 3 and 4 is smoothly discharged is formed by forming protrusions or ribs on the roller surface, the drainage groove 2
3 may have any form. Further, the reversing guide roller 21 shown in FIG. 9 is composed of a cylindrical water absorbing body 24 such as a sponge and a roller 25 arranged around the water absorbing body 24. The reversal guide roller 21 can remove water with the water absorbing body 24.

Next, the operation of this sludge dewatering device will be described. As shown in FIG. 4, when the drive device, that is, the motor 5 is turned on, the drive rollers 6 and 6 rotate in the directions of the arrows, respectively, and the rotation of the drive rollers 6 and 6 causes the roller groups 7 and 7 to be mounted. The filter cloth belts 3 and 4 thus made run. The filter cloth belts 3 and 4 are formed by connecting the filter cloth belt members 3F and 4F to 180
It is an endless filter cloth belt in which both ends of the filter cloth belt members 3F and 4F are connected by twisting or reversing. Therefore, as shown in FIG. 10, for example, even when a force to meander the filter cloth belts 3 and 4 acts in the E direction or the F direction, the filter cloth belts 3 and 4 return to their original positions, so Cloth belt 3,
The roller 4 does not meander in the axial direction of the rollers 6 and 7.

The sludge 1 to be dehydrated is supplied from the supply unit 2 onto the filter cloth belt 3 and transferred while being gravity dehydrated. The filter cloth belt 3 is turned by the rollers 7 and face-to-face polymerized with the filter cloth belts 4, and the sludge 1 is rollingly sandwiched between the filter cloth belts 3 and 4 while being pressed and dehydrated by the pressure roller 8.

Next, the sludge 1 that has been dehydrated under pressure reaches the shear dehydration section S while being sandwiched between the filter cloth belts 3 and 4. In the shear dehydration section S, the polymerized filter cloth belts 3 and 4 run outside the plurality of planetary rollers 14 while being tensioned, and are sequentially subjected to shearing force by the planetary rollers 14. At this time, by rotating the support member 17 by the motor, the planetary roller 1
4, the contact portion between the planetary roller 14 and the superposed filter cloth belts 3, 4 is moved by the relative speed generated by the difference between the running speed of the superposed filter cloth belts 3, 4 and the number of shears by the planetary roller 14. Can be increased, and the sludge 1 can be efficiently dehydrated.

The sludge 1 that has been subjected to the pressure dehydration and the shear dehydration as described above is then squeezed by the squeeze roller 9 to become the dehydrated cake 10, and then the filter cloth belts 3, 4
When it is divided into two parts, the dehydrated cake 10 is peeled off from the filter cloth belts 3 and 4, and is conveyed by the conveyor 11 or the like.

After the dehydrated cake 10 is peeled off, the filter cloth belts 3 and 4 are washed by receiving washing water from the washing device 12. The washed filter cloth belts 3, 4 are guided by the reversing guide rollers 21 and gradually move from the horizontal state to the vertical state in the width direction while they are running, and then change to the horizontal state again, and the opposite surface is changed. The filter cloth belts 3 and 4 are turned upside down. Therefore, when the surfaces of the filter cloth belts 3 and 4 that were in contact with the sludge 1 are turned over again after reaching the overlapping portion, the surfaces on the opposite side will contact the sludge 1 this time. In this way, the filter cloth belts 3 and 4 alternately change the surfaces with which the sludge 1 comes into contact with each other. Similarly, since the surfaces of the filter cloth belts 3 and 4 in contact with the various rollers are alternately changed, the surface damage of the filter cloth belts 3 and 4 is significantly reduced.

Further, only one cleaning device 12 is installed on each of the filter cloth belts 3 and 4, but since the filter cloth belts 3 and 4 are turned over once, the filter cloth belts 3 and 4 are reversed. Both sides will be washed alternately. Since the washing water is sprayed from the surface of the filter cloth belts 3 and 4 opposite to the contact surface with the sludge 1, that is, the surface opposite to the passage direction of the filtrate, suspended matter, organic matters and heavy metals in the filtrate are filtered. It is hard to be accumulated inside the cloth, and it is possible to prevent the deterioration of the filtering ability. Of course, the surfaces of the filter cloth belts 3 and 4 that spray the cleaning water may be the surfaces in contact with the sludge 1.

Inversion guide roller 21 having a draining function
Squeezes the filter cloth belts 3 and 4 from both sides, the washing water contained in the filter cloth is exposed from the filter cloth surface, and the draining pan 22
Is discharged to. At that time, since the reverse guide roller 21 and the filter cloth belts 3 and 4 are in the vertical state or the inclined state,
The washing water exposed from the filter cloth is smoothly discharged along the surface of the reversing guide roller 21 or the water drain groove 23.

[0026]

Since the sludge dewatering device according to the present invention is constructed as described above, it has the following effects.
That is, the sludge dewatering device according to the present invention applies the principle of the curved surface of Mobius strip to the filter belt,
Both the front surface and the back surface of the filter cloth belt form a surface for dehydrating sludge. Therefore, the surfaces of the various rollers in contact with the filter cloth belt correspond to the front and back surfaces of the conventional filter cloth surface, and the surface damage of the filter cloth belt is greatly reduced. That is,
The life of the filter cloth belt is, for example, about twice as long as that of the conventional sludge dewatering device in which various rollers are in contact with only one side of the filter cloth belt.

The surface of the filter cloth belt that the sludge contacts also corresponds to both the front and back sides of the conventional filter cloth surface, so that during dehydration, the filtrate alternates from one surface of the filter cloth belt to the other surface. Flow through, and therefore turbidity in the filtrate, organics,
Heavy metals are less likely to be accumulated inside the filter cloth, and the filtering ability is less likely to decrease. Therefore, sludge on the filter cloth surface of the filter cloth belt is significantly reduced.

Further, in the conventional sludge dewatering device, the filter cloth belt sometimes meanders in the axial direction of the roller during operation. However, in the sludge dewatering device according to the present invention, when the filter cloth belt meanders, Since the force to return to the original force works, stable running of the filter cloth belt is possible.

Further, in the conventional sludge dewatering device, as shown in FIG. 11, when one cleaning device is provided for one filter cloth belt, only the filter cloth belt is cleaned from one surface. Met. On the other hand, the sludge dewatering device according to the present invention is a single cleaning device, and is a filter cloth belt from the surface opposite to the surface of the filter cloth belt in contact with sludge, that is, the surface opposite to the passage direction of the filtrate. The cleaning of both sides can be alternately repeated. Therefore, the sludge dewatering device according to the present invention prevents the filtration capacity of the filter cloth belt from decreasing. Further, conventionally, if the cleaning of the filter cloth belt is to be performed from both sides of the filter cloth belt, it is naturally necessary to install a cleaning device on each of the inner side surface and the outer side surface of the filter cloth. Although there was a problem of increasing the number, the sludge dewatering device can clean the back and front of the filter cloth belt by installing the cleaning device in one place, so the number of cleaning devices installed is reduced and The cost can be reduced.

[Brief description of drawings]

FIG. 1 is a front view showing a filter cloth belt member used for manufacturing an endless filter cloth belt in a first embodiment of a sludge dewatering device according to the present invention.

FIG. 2 is a front view showing a state in which the filter cloth belt member shown in FIG. 1 is twisted or inverted by 180 degrees.

FIG. 3 is a perspective view showing an embodiment of a completed endless filter cloth belt used in the sludge dewatering device according to the present invention.

FIG. 4 is an explanatory view showing an embodiment of the sludge dewatering device according to the present invention.

FIG. 5 is a partial sectional front view of a shear dewatering section in this sludge dewatering apparatus.

6 is a cross-sectional view taken along the line QQ of FIG.

FIG. 7 is a perspective view showing an example of a draining roller.

FIG. 8 is a perspective view showing another example of the draining roller.

FIG. 9 is a plan view showing still another example of the draining roller.

FIG. 10 is an explanatory diagram for explaining meandering of the filter cloth belt.

FIG. 11 is a side view showing an example of a conventional sludge dewatering device.

FIG. 12 is a perspective view showing a conventional filter cloth belt.

[Explanation of symbols]

 1 Sludge 3,4 Filter cloth belt 3F, 4F Filter cloth belt member 5 Driving device 6 Driving roller 7 Roller group 8 Pressure roller 9 Squeezing roller 10 Dewatering cake 12 Cleaning device 21 Inversion guide roller S Shear dewatering section

Claims (2)

[Claims] 1. A pair of endless filter cloth belts, each of which is movably mounted on a plurality of rollers and connected endlessly in a state of being inverted 180 degrees in the middle, and a part of the endless filter cloth belts facing each other. A plurality of shear dewatering units configured to be polymerized between the endless filter cloth belts, and a plurality of shearing force applying a shearing force to the sludge for performing shear dewatering by sandwiching sludge running in the shear dewatering unit between the filter cloth belts. A sludge dewatering device having a shearing roller. 2. The endless filter cloth belt in a 180 ° inverted state is formed by turning one filter cloth belt member 180 degrees in the middle and connecting both ends. The sludge dewatering device according to.