JPH06304796A - 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 a sludge dehydrating part by bending a filter cloth belt, and constructing so that sludge comes into contact with both surfaces of the filter cloth belt alternately. CONSTITUTION:One endless filter cloth belt 30 is engaged with rollers 31, 32 and 33 respectively so that it is possible to run, and a first filter cloth belt part 36 and a second filter cloth belt part 37 are constructed. And, a shear dehydrating part S is constructed between filter cloth belt parts 36 and 37 respectively by reversing the filter cloth belt by 180 deg. in the middle of the endless filter cloth belt. Sludge 1 is squeezed with shearing rollers 35 in the shear dehydrating part S and dehydrated, and peeled off after becoming a dehydrated cake 42. The filter cloth belt parts 36 and 37 are reversed respectively, the sludge 1 comes into contact with the front side and the rear side of each surface of each filter cloth belt part 36 and 37, and since it returns to the original position after making four rounds, the damage of the endless filter cloth belt 30, is 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. 12, 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. 13, and therefore has the following problems. That is, the above sludge dewatering device has a problem that at least rollers for supporting the upper and lower two belts are required, the climate becomes complicated, and the equipment itself becomes large.

Therefore, an object of the present invention is to solve the above-mentioned problems, and at least three filter cloth belts are provided.
Sludge dewatering part that bends and polymerizes by using one roller is used, and by using the filter cloth belt in double, it is possible to dewater sludge with one filter cloth belt, and the number of parts such as rollers Is to provide a sludge dewatering device in which the device itself is configured simply and compactly.

[0006]

In order to achieve the above object, the present invention is configured as follows. That is, according to the present invention, a first filter cloth belt portion and a second filter cloth belt portion, which are respectively movably mounted on a plurality of rollers and are turned 180 degrees in the middle, are connected endlessly. Endless filter cloth belt, part of the first filter cloth belt portion and the second filter cloth belt portion of the endless filter cloth belt are face-to-face polymerized with each other, and the first filter cloth belt portion and the second filter cloth belt. Shear dewatering section configured between the cloth belt section,
And a plurality of shear rollers for applying a shearing force to the sludge to perform shear dewatering by sandwiching the sludge running in the shear dewatering section between the first filter cloth belt portion and the second filter cloth belt portion, The present invention relates to a sludge dewatering device having:

Further, in this sludge dewatering device, 180
The first filter cloth belt portion and the second filter cloth belt portion, which are in a state of being inverted, invert two overlapped filter cloth belt members by 180 degrees, respectively, and one end of the filter cloth belt member is the other. The filter cloth belt unit is connected to both ends.

Alternatively, in this sludge dewatering device, 18
The first filter cloth belt portion and the second filter cloth which are inverted by 0 degrees.
In the filter cloth belt portion, one filter cloth belt unit is inverted by 360 degrees to connect the ends to each other, and 360 degree inversion is performed by the first filter cloth belt portion and the second filter cloth belt portion.
It is configured by sharing the inversion of 80 degrees.

In this sludge dewatering apparatus, the shear dewatering section is constructed of a sun roller and a sludge circumscribing the sun roller so that the sludge can be rotatably supported around the sun roller. A plurality of planetary rollers for applying force are provided.

[0010]

The sludge dewatering device according to the present invention is constructed as described above, and therefore operates as follows. That is, in this sludge dewatering device, as described above, one endless filter cloth belt is reversed and used in duplicate, and the first filter cloth belt portion and the second filter cloth belt portion are used.
It is possible to perform shear dewatering by sandwiching the sludge with the filter cloth belt portion. On the other hand, when two filter cloth belts are used in a doubled manner as in the conventional sludge dewatering device, delicate alignment adjustment of the filter cloth belts is required and it becomes difficult to put into practical use. Further, in the conventional sludge dewatering device, the filter cloth belt sometimes meanders in the axial direction of the roller during operation, but in the sludge dewatering device according to the present invention, when the filter cloth belt meanders, it returns to the original state. Since the force works, stable operation of the filter cloth belt is possible. Furthermore, since this sludge dewatering device uses one filter cloth belt in double, it can produce the following effects.

That is, in the conventional sludge dewatering device, if the filter cloth belt is to be washed from both sides of the filter cloth belt, it is of course necessary to install a cleaning device on each of the inner side surface and the outer side surface of the filter cloth. However, there is a problem that the number of cleaning devices increases, but with this sludge dewatering device, both the first filter cloth belt portion and the second filter cloth belt portion can be installed simply by installing the cleaning device in one place. Since cleaning can be performed, the number of cleaning devices installed can be reduced and the cost of the entire device can be reduced. Further, in the conventional sludge dewatering device, when the supplied sludge is in a fluid state, there is a problem that the sludge flows out in the width direction of the filter cloth belt unless the filter cloth belt is maintained in a horizontal state. However, according to this sludge dewatering device,
Sludge can be supplied in a horizontal portion formed in the sludge inverting section, and even if the filter cloth belt is configured to run vertically, the problem that sludge flows out in the width direction of the filter cloth belt Does not happen.

Moreover, in order to improve the filtration capacity,
Conventionally, the filter width had to be designed to be large, and therefore the installation space for the sludge dewatering device was very large, but with this sludge dewatering device, even if the width of the filter cloth belt is increased, Since the filter cloth belt can be configured to run vertically, the installation area hardly increases. Moreover,
When the filter cloth belt is configured to run vertically,
The dehydrated filtrate easily flows out in the vertical direction, and sludge is easily separated because it is in the gravity direction.

Further, in this sludge dewatering device, the water draining rollers can be arranged so that the axis of the water draining rollers is in the vertical direction or the inclined direction, and the filter cloth belt is squeezed between the water draining rollers to remove the water from the filter cloth. The exposed cleaning water is smoothly discharged vertically, and the cleaning water can be drained smoothly.

As described above, the sludge dewatering device according to the present invention can reduce the number of parts such as the roller and the cleaning device, and also can greatly reduce the installation space.
The sludge dewatering apparatus as a whole can be made extremely small and the cost can be reduced.

[0015]

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 11 show a first embodiment of a sludge dewatering device according to the present invention.

Next, another embodiment of the sludge dewatering device according to the present invention will be described with reference to FIGS. 1 to 11 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. 3 is a perspective view of the completed filter cloth belt, and FIG.

The filter cloth belt 30 of this embodiment has a filter cloth belt member 28 (center line is indicated by CL ₁ ) and a filter cloth belt member 29 (center line is indicated by CL ₂ ) as shown in FIG. It is produced by superposing each other on each other.
That is, as shown in FIG. 2, two filter cloth belt members 28,
29 is twisted by 180 degrees, that is, inverted, and the points G and N, the points H and M, the points J and K, the points I and L are overlapped, and the sides of the ends are connected to each other. One endless filter cloth belt 30 as shown in FIG. 3 is manufactured. When each side of the filter cloth belt 30 is traced, the upper side becomes G → I → L → N → G. Then, it is reversed by G → I and L → N. The lower side is H → J → K → M → H. Then, it is reversed by H → J and K → M. The center line is L ₁ → L ₂ → L ₃ → L ₄ .

In the sludge dewatering apparatus of this embodiment, the endless filter cloth belt 30 shown in FIG. 3 is mounted on at least three rollers 31, 32 and 33 as shown in FIG. It has a basic structure. In FIG. 4, the three rollers 31, 32, 33 are installed in the vertical direction. FIG. 5 is an explanatory view showing an embodiment of the sludge dewatering device according to the present invention. One endless filter cloth belt 30 has at least 3
An inner filter cloth belt portion 36 and an outer filter cloth belt portion 37 mounted on a drive compression roller 31, an inner driven roller 32, and an outer driven roller 33, which correspond to a book roller, are connected endlessly, The inner filter cloth belt portion 36 and the outer filter cloth belt portion 37 are respectively configured to be 180 degrees inverted in the middle. The arrows in FIG. 5 indicate the rotation directions of various rollers and the traveling direction of the filter cloth belt 30.

In this sludge dewatering device, the endless filter cloth belt 30 is bent to form an inner filter cloth belt portion 36 and an outer filter cloth belt portion 37, and the respective portions 36,
Since it is reversed at 37, the sludge 1 comes into contact with the front and back of each surface of the filter cloth belt portions 36, 37, and returns to the original position after four laps, and contacts the sludge 1 on each surface. The number of times is four, which is intermittently twice, and damage to the endless filter cloth belt 30 is reduced. The drive pressing roller 31 is a sun roller and has a function corresponding to the shearing / dewatering section S and a function of running the filter cloth belt 30 at the same time. Therefore, in this embodiment, one device performs two functions, and the number of parts is reduced. The structure of the drive pressing roller 31 is almost the same as that of the shear dehydration unit S described later.

The structure of the shear dewatering section S is shown in FIGS.
(See JP-B-64-3600), the sun roller 13 and a plurality of planetary rollers 14 mounted on the sun roller 13 are provided, and both ends of the rotary shaft 15 of the sun roller 13 are rotatably held by the frame 16. Has been done. 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 is a pinion gear 20.
The pinion gear 20 rotates integrally with the 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.

In this sludge dewatering apparatus, the first filter cloth belt portion of the endless filter cloth belt 30, that is, the inner filter cloth belt portion 3
No. 6 changes its direction by the driving pressing roller 31 of the sun roller, changes its direction by the inner driven roller 32, and then reverses it by 180 degrees. The second filter cloth belt portion, that is, the outer filter cloth belt portion 37 is changed in direction by the driving press roller 31, then changed in direction by the outer driven roller 33, and then inverted by 180 degrees. Moreover, the inner filter cloth belt portion 36 and the outer filter cloth belt portion 37 are face-to-face polymerized with each other in the area of the drive squeeze roller 31, and shear dewatering occurs between the inner filter cloth belt portion 36 and the outer filter cloth belt portion 37. Section S is constructed.
The sludge 1 traveling in the shear dewatering section S is pinched between the inner filter cloth belt portion 36 and the outer filter cloth belt portion 37 so as to apply a shearing force to the sludge 1 by a plurality of planetary roller shearing rollers 35. And shear dewatering is performed.

Since this sludge dewatering device has a double structure in which the inner filter cloth belt portion 36 runs in parallel with the inner filter cloth belt portion 37, the installation space is much smaller than the conventional one. Becomes smaller. Therefore, this sludge dewatering device is much smaller than the conventional one. Further, since the filter cloth belt 30 is installed in the vertical direction except for the filter cloth reversing portion 38, the installation area hardly changes even if the filter cloth width is increased.

Further, the sludge 1 is supplied in the gap between the inner filter cloth belt portion 36 and the outer filter cloth belt portion 37 of the filter cloth reversing section 38, that is, the area indicated by the arrow F in FIG. The filter cloth belt 30 includes a reverse guide roller 39 at the filter cloth reverse section 38.
Guided to, gradually change from the vertical state to the horizontal state, and then rotate in the same direction to become the vertical state.
Reverse 0 degrees. Since the sludge 1 is supplied in the horizontal portion of the filter cloth reversing section 38 as described above, the sludge 1 can be uniformly introduced in the width direction of the filter cloth belt 30.

The supplied sludge 1 is sandwiched between the inner filter cloth belt portion 36 and the outer filter cloth belt portion 37, and the filter cloth belt 30 changes from the horizontal state to the vertical state in the sandwiched state. Therefore, the sludge 1 does not flow out from both sides of the filter cloth belt 30. The sludge 1 is squeezed in the shear dewatering section S while being subjected to a shearing force by the driving compression roller 31, and dehydration is performed during that time. Since the filter cloth belt 30 is running in a vertical state, the dehydrated filtrate flows out in the direction of gravity and is smoothly removed.

In the filter cloth belt 30, the inner filter cloth belt portion 36 and the outer filter cloth belt portion 37 are overlapped with each other in a portion from the driving pressing roller 31 to the sludge separating roller 41, but the diameter of the inner driven roller 32 is large. Is smaller than the diameter of the outer driven roller 33, the inner filter cloth belt portion 36 and the outer filter cloth are disposed in the sludge separating section 40 from the sludge separating roller 41 to the inner driven roller 32 and the outer driven roller 33. The belt portions 37 are separated from each other.
In the sludge stripping section 40, the dehydrated cake 42 is stripped from the filter cloth belt 30 and falls by its own weight because the space between the vertically running inner filter cloth belt portion 36 and the outer filter cloth belt portion 37 is separated.

A cleaning device 43 is installed in the sludge stripping section 40. Filter cloth belt 30 washed by the washing device 43
Is sandwiched and squeezed by a pair of draining rollers 44 arranged so as to face each other. By this pressing, the filter cloth belt 3
The wash water is removed from 0. The draining roller 44 is shown in FIG.
And has a structure as shown in FIG. 8 is a perspective view of the draining roller, and FIG. 9 is a sectional view taken along the line P-P of FIG. The groove 47 of the water draining roller 44 is inclined with respect to the axis line, and its inclination direction coincides with the direction in which the rotation speed of the water draining roller 44 and the water falling speed are combined, so that the water draining is smoothly performed. . The draining roller 44
In addition to the above, the structure shown in FIGS. 7 to 9 may be used. Further, the reverse guide roller 39 may have the function of the water draining roller 44.

This sludge dewatering device has the above-mentioned structure and operates as follows. First, when the motor is turned on, the drive pressing roller 31 rotates and the filter cloth belt 30 runs. The sludge 1 supplied in the area indicated by the symbol F in the horizontal portion of the filter cloth reversing portion 38 is the inner filter cloth belt portion 36 and the outer filter cloth belt portion 3 of the filter cloth belt 30.
It is transferred to the driving pressing roller 31 while being sandwiched between the driving pressing roller 31 and the driving pressing roller 31. The drive pressing roller 31 dehydrates the sludge 1 while pressing it, and the dehydrated dehydrated cake 42 is transferred to the sludge peeling section 40. In the sludge peeling section 40, the inner filter cloth belt portion 36 and the outer filter cloth belt portion 3 of the filter cloth belt 30 that have been polymerized
Since 7 and 2 are separated from each other, the dehydrated cake 42 is easily peeled off by its own weight and dropped onto the conveyor. Then, filter cloth belt 3
0 is washed by the washing device 43. Filter cloth belt 30
The washing water contained in (1) is removed by the draining roller 44. Then, the filter cloth belt 30 is reversed while being guided by the reverse guide roller 39. By this reversal, the surface holding the sludge 1 faces outward, and the outer surface not holding the sludge 1 faces the inner surface to hold the sludge 1.

In this sludge dewatering device, only one sludge-peeling roller 41 is provided. However, if a plurality of sludge-peeling rollers 41 are installed as shown in FIG. Since the filter cloth belt 30 can be quickly separated into two pieces, sludge can be peeled off more favorably.

In the case of difficult dehydration, a scraping scraper may be installed to scrape off the sludge adhered to the filter cloth belt 30 after the sludge is peeled off.

Further, in this sludge dewatering device, the drive pressing roller 31 is provided. However, as shown in FIG. 7, the drive pressing roller 31 is one driving roller 45 and a plurality of pressing rollers 4.
You may comprise from six.

[0031]

Since the sludge dewatering device according to the present invention is constructed as described above, it has the following effects.
That is, since the sludge dewatering device according to the present invention is configured as described above, the filter cloth belt may meander in the axial direction of the roller during operation of the conventional sludge dewatering device.
In the sludge dewatering device according to the present invention, when the filter cloth belt meanders, a force for returning to the original works, so that stable operation of the filter cloth belt can be performed.

Conventionally, if the filter cloth belt is to be washed 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 is a problem that the number of washing devices increases, this sludge dewatering device can wash both the first filter cloth belt portion and the second filter cloth belt portion only by installing the washing device in one place. Therefore, the number of cleaning devices installed is reduced,
The cost of the entire device can be reduced.

Further, in the conventional sludge dewatering device, when the supplied sludge is in a fluid state, the sludge flows out in the width direction of the filter cloth belt unless the filter cloth belt is maintained in the horizontal state. However, according to this sludge dewatering device, it is possible to supply the sludge in the horizontal portion formed in the sludge reversing portion, and even if the filter cloth belt is configured to run in a vertical state, There is no problem of sludge flowing out in the width direction of the filter cloth belt.

Moreover, in order to improve the filtration capacity,
Conventionally, the filter width had to be designed to be large, and therefore the installation space for the sludge dewatering device was very large, but with this sludge dewatering device, even if the width of the filter cloth belt is increased, Since the filter cloth belt can be configured to run vertically, the installation area hardly increases. Moreover,
When the filter cloth belt is configured to run vertically,
The dehydrated filtrate easily flows out in the vertical direction, and sludge is easily separated because it is in the gravity direction.

Further, in this sludge dewatering device, the draining rollers can be arranged so that the axis of the draining rollers is vertical or inclined, and the filter cloth belt is squeezed between the draining rollers to remove it from the filter cloth. The exposed cleaning water is smoothly discharged vertically, and the cleaning water can be drained smoothly.

As described above, the sludge dewatering device according to the present invention can reduce the number of parts such as the roller and the cleaning device, and also can greatly reduce the installation space.
The sludge dewatering apparatus as a whole can be made extremely small 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 an 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 of FIG. 1 is twisted or inverted 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 for explaining meandering of an endless filter cloth belt in this sludge dewatering device.

FIG. 5 is an explanatory view showing an embodiment of the sludge dewatering device according to the present invention.

FIG. 6 is a partial plan view showing an example in which a large number of sludge peeling rollers are provided.

FIG. 7 is a partial plan view showing an example in which a large number of pressing rollers are provided.

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

9 is a cross-sectional view taken along the line P-P in FIG.

FIG. 10 is a partial cross-sectional front view of a shear dewatering unit in this sludge dewatering device.

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

FIG. 12 is a side view showing an example of a conventional sludge dewatering device.

FIG. 13 is a perspective view showing a conventional filter cloth belt.

[Explanation of symbols]

 1 Sludge 30 Filter cloth belt 32 Inner driven roller 33 Outer driven roller 36 Inner filter cloth belt portion (first filter cloth belt portion) 37 Outer filter cloth belt portion (second filter cloth belt portion) 38 Filter cloth reversing portion 39 Inversion guide Roller 40 Sludge stripping section 41 Sludge stripping roller 42 Dewatering cake 43 Cleaning device S Shear dewatering section

Claims (3)

[Claims] 1. A single endlessly connected first filter cloth belt portion and second filter cloth belt portion that are respectively movably mounted on a plurality of rollers and are turned 180 degrees in the middle. Endless filter cloth belt, part of the first filter cloth belt portion and the second filter cloth belt portion of the endless filter cloth belt are face-to-face polymerized with each other, and the first filter cloth belt portion and the second filter cloth A shear dewatering section configured between the belt section and the shear dewatering section between the first filter cloth belt section and the second filter cloth belt section for pinching and performing shear dewatering. A sludge dewatering device, comprising: a plurality of shear rollers that apply a shearing force to the sludge. 2. The first filter cloth belt portion and the second filter cloth belt portion which are turned over 180 degrees are overlapped with each other.
The filter cloth belt member of one book is inverted by 180 degrees, and both ends of one of the filter cloth belt members are connected to both ends of the other filter cloth belt member, respectively, and configured. Sludge dewatering device. 3. The first filter cloth belt portion and the second filter cloth belt portion which are turned 180 degrees are connected to each other by turning one filter cloth belt member by turning the filter cloth belt member 360 degrees. The sludge dewatering device according to claim 1, wherein the first filter cloth belt portion and the second filter cloth belt portion are configured to share 180 degree inversion in degrees.