JPH06304795A - Sludge dehydrator - Google Patents

Abstract

PURPOSE:To prevent flowing out of sludge from a filter cloth belt at the time of dehydration without injecting coagulant. CONSTITUTION:Fluid sludge is supplied into a filter cloth belt 1 from one place of the opening part 3 of the upward filter cloth belt 1, is received by a bent part 2, and is stored in the filter cloth belt 1. When squeezing the fluid sludge by a dehydrating roller 14, when a squeezing force is applied toward the bent part 2 side from the opening part 3 side of the filter cloth belt 1, it can prevent that the sludge flows out of the opening part 3 of the filter cloth belt 1. The sludge is gradually dehydrated by the dehydrating roller 14 to become a dehydrated cake. Since the double folded filter cloth belt 1 has a part whose opening part 3 faces downward by turning half, when a part of the portion is widened, the dehydrated cake drops quickly by dead weight.

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 dewatering device in which two endless filter cloth belts are movably mounted on a plurality of rollers in a face-to-face overlapping state, and sludge is sandwiched between these filter cloth belts to depressurize under pressure. Is
There are various things. In particular, in recent years, in addition to the pressure dehydration unit,
Further, a sludge dewatering device provided with a shear dewatering unit having a plurality of shear rollers has been attracting attention. This sludge dewatering device further improves 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. 14, 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 to face the overlapping portions of the filter cloth belts 53 and 54, and further to 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.
After passing through, the filter cloth belt 53 and the filter cloth belt 54 separate from each other, and are separated from the filter cloth belts 53 and 54 and fall 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 belt-type sludge dewatering device uses two filter cloth belts, and the sludge dewatering depends on the tension of the filter cloth. The force in the perpendicular direction must be uniform. Moreover, since the sludge sandwiched between the overlapping portions of the two filter cloth belts is in a fluid state, when the sludge is pressed, a force acts uniformly on the entire sludge according to the principle of Pascal, and both sides of the filter cloth belt are affected. Sludge will flow out from the neighborhood. In order to prevent the sludge from flowing out from both sides, various attempts have been conventionally made by devising the shape of the belt, but it has hardly been solved.

Therefore, in a belt type sludge dewatering device, generally, an organic polymer coagulant such as a polymer is injected into sludge,
The mainstream is to change the sludge properties and dehydrate. However, it is not possible to directly discharge the filtrate in which the residual polymer is mixed and the filtrate of high color due to the polymer. In addition, under certain conditions, for example, under conditions such as collecting the filtrate generated from the construction site and reusing water, chemical injection uses an inorganic polymer or sludge without chemical injection. Will be processed. However, inorganic polymers do not provide the same binding flocs as the above-mentioned organic polymers, and in practice, filter press by chemical injection is the mainstream.

Therefore, an object of the present invention was developed in consideration of the above-mentioned circumstances, and one endless filter cloth belt is used, and the filter cloth belt itself is subjected to shear dewatering.
By having the function of stopping the outflow of sludge,
It is an object of the present invention to provide a sludge dewatering device that can prevent sludge from flowing out of a filter cloth belt during dewatering without injecting a coagulant.

[0007]

The present invention is configured as follows to achieve the above object. That is, according to the present invention, there is provided a closed portion in which a plurality of roller groups are respectively movably hooked and connected endlessly in a state of being inverted by 180 degrees at two locations on the way, and one side edge in the longitudinal direction is closed. One endless filter cloth belt having an opposed filter cloth portion formed in an opening whose side edge is open, and a part of the opposed filter cloth portion of the endless filter cloth belt is face-to-face polymerized with each other to form the opposed filter cloth. Shearing dewatering unit configured between the parts, a plurality of shearing rollers for applying a shearing force to the sludge in order to perform shear dewatering by pressing the sludge between the opposing filter cloth parts by the shearing dewatering unit, and among the roller group And a drive device for driving the endless filter cloth belt to drive the at least one roller.

Further, in this sludge dewatering device, the endless filter cloth belt has a bent portion formed by bending a central portion in the longitudinal direction at the closing portion, and both side edges in the width direction are opposed to each other to form the opening portion. It was done.

Further, in this sludge dewatering device, the first vertical axis roller movably hangs the filter cloth belt with the opening portion facing upward, and the filter cloth belt with the opening portion facing downward. A second vertical roller movably mounted, a sludge supply unit formed by expanding a part of the opening facing upward and supplied with sludge, and a part of the opening facing downward. And a sludge discharge part for discharging the dehydrated cake.

Further, in this sludge dewatering device, expandable and contractable partition members are provided between the opposed filter cloth portions in the longitudinal direction, and the filter members folded in half are in a half-opened state. It can be made of an elastic material such as rubber so that it spreads like a fan when opened, or it can be made foldable with a filter cloth or the like.

[0011]

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, fluid sludge is supplied into the filter cloth belt through the opening, and is received by the middle bent portion in the longitudinal direction of the filter cloth belt. If you squeeze using a group of rollers to close the folded opening and apply force toward the bent part, the sludge will dehydrate without flowing out from the filter cloth belt. be able to.

Further, in this sludge dewatering device, the fluid sludge is discharged at one place of the opening of the filter cloth belt facing upward,
That is, it is supplied from the sludge supply unit into the filter cloth belt, received by the bent portion, and stored in the filter cloth belt. The fluid sludge stored in the filter cloth belt is squeezed by the dewatering roller. At that time, if the squeezing force is applied so that the opening of the filter cloth belt is closed and the squeezing force is applied toward the bent portion side. The sludge can be prevented from flowing out from the filter cloth belt. In this way, the bent portion of the filter belt has the function of stopping the outflow of sludge, so that even if the coagulant is not injected,
It is possible to prevent sludge from flowing out of the filter cloth belt during dewatering. The dehydrated cake formed by dehydration is dropped from the filter cloth belt by its own weight only by expanding a part of the opening portion facing downward (sludge dehydration part), and is quickly discharged.

[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 7 show an embodiment of a sludge dewatering device according to the present invention. FIG. 1 is an explanatory view showing a manufacturing process of a filter cloth belt. Filter cloth belt 1
Is an elongated band-shaped filter cloth AB as shown in FIG.
First, as shown in (b), the CD is folded in two in the longitudinal direction at the center line MN, and then, as indicated by the symbol E in (c), the filter cloth is twisted by 180 degrees, and then (d) ) Further, as shown by the symbol F in FIG. The filter cloth belt 1 is
As described above, it is twisted by 360 degrees for convenience, and is manufactured by connecting both ends of the folded filter cloth to each other.

The completed filter cloth belt 1 has a shape as shown in FIG. The filter cloth belt 1 has a bent portion 2 and an opening 3 formed when the filter cloth is folded in two in the longitudinal direction. FIG. 2 is an inclined view showing the basic configuration of this sludge dewatering device, in which the filter cloth belt 1 is hung on two vertical rollers 4 and 5. As a method of hanging the filter cloth belt 1 on the vertical axis rollers 4 and 5, there is also a method of hanging the filter cloth belt 1 so that the opening is on both vertical axis rollers, but in this embodiment, The first vertical axis roller 4 is hooked so that the opening 3 is on the upper side, and the second vertical axis roller 5 is hooked so that the opening 3 is on the lower side. This is because the latter is easier to operate considering the inflow of sludge into the filter cloth belt and the discharge of the dehydrated cake. Further, as in this embodiment, of the two vertical rollers 4 and 5, one is generally a driving roller for traveling the filter cloth belt 1 and the other is a driven roller. is there.

Since the filter cloth belt 1 is formed by twisting the filter cloth 360 degrees, the filter cloth belt 1 hung on the roller groups 4 and 5 has an inversion portion in which the opening 3 turns from the upper side to the lower side. ,
Although the reversal portion in which the opening 3 rolls from the lower side to the upper side is naturally formed, in practice, a guide roller is used for accurately reversing the filter cloth belt 1 at a predetermined position. The filter cloth belt is guided and held by the guide rollers by providing a plurality of pairs of guide rollers arranged so as to sandwich the filter cloth belt, and by providing each set of guide rollers so that the angle gradually changes. However, it can be flipped smoothly.

Specifically, the sludge dewatering device has a structure as shown in FIG. FIG. 3 is a plan view showing a sludge dewatering device. The filter cloth belt 1 is wound around a pressing drive roller 4 which is a first vertical axis roller and a driven roller 5 which is a second vertical axis roller. The filter cloth belt 1 is mounted so that the opening 3 is on the upper side and the bent portion 2 is on the lower side with respect to the squeezing drive roller 4, but the opening 3 is opposite to the driven roller 5. Is hung on the lower side and the bent portion 2 is on the upper side. In addition, the portion where the direction of the opening 3 changes from the lower side to the upper side, that is, the reversing portion 6, the driven roller 5 to the squeezing drive roller 4
It is located on the way to. A part of the opening portion 3 facing upward is spread and the fluid sludge is supplied into the filter cloth belt 1 from the spread portion. The location where this sludge is supplied is referred to as the sludge supply unit 7. In addition, the opening facing downwards is partly expanded,
The dehydrated cake is discharged from the spread portion.
The place where this dehydrated cake is discharged is called the sludge discharge unit 8.

The squeezing drive roller 4 is provided with a sun roller 9 and a plurality of planet rollers 10 which are mounted on the sun roller 9, and its mechanism is the same as that of the conventional one. When the switch of the variable speed motor, which is a driving device, is turned on, the rotation of the variable speed motor is transmitted to the sun roller 9 and the planetary roller 10 via the transmission mechanism, and the sun roller 9 rotates and the planetary roller 1 rotates.
0 revolves around the sun roller 9. At that time, the filter cloth belt 1 travels outside the plurality of planetary rollers 10 while being tense, and is sequentially subjected to shearing force by the planetary rollers 10. Therefore, the squeezing drive roller 4 has a function as a drive roller for running the filter cloth belt 1 and a function as a shear dewatering section for shear squeezing the sludge.

The sludge supply unit 7 has a structure as shown in FIG. FIG. 4 is a perspective view showing the sludge supply unit 7. In the sludge supply unit 7, a pair of upper opening rollers 11 arranged at intervals is inserted into the opening 3 from above, and the closed opening 3 is spread laterally by the upper opening roller 11. Then, the filter cloth belt 1 opens in a V shape. Since the upper opening roller 11 has a conical shape, the size of the opening can be adjusted smoothly by adjusting the vertical position of the upper opening roller 11.
A supply pipe 12 is inserted into the opening 3 spread by the upper opening roller 11, and the sludge 13 is supplied from the supply pipe 12 into the filter cloth belt 1. The sludge 13 supplied is received by the bent portion 2 of the filter cloth belt 1.

Three sets of primary dewatering rollers 14 are arranged in front of the sludge supply unit 7 in the running direction of the filter cloth belt 1 (direction of arrow X in FIGS. 3 and 4) so as to sandwich the filter cloth belt 1 therebetween. There is. The opening 3 spread by the upper opening roller 11 is closed again by the three sets of primary dewatering rollers 14. The structure of the primary dewatering roller 14 is as shown in FIG. The primary dewatering roller 14 shown in FIG.
Is located closest to the sludge supply unit 7, the primary dewatering roller 14 shown in (c) is located closest to the squeezing drive roller 4, and the primary dewatering roller 14 shown in (b) is at an intermediate position between them. It is arranged.

The primary dewatering rollers 14 shown in FIGS. 5A and 5B are a pair of vertical rollers 15 arranged so that their central axes coincide with each other in the vertical direction, and a horizontal direction below the vertical rollers 15. The filter cloth belt 1 is surrounded by a vertical roller 15 and a horizontal roller 16. The vertical roller 15 is composed of an upper cylindrical portion 17 and a lower conical portion 18. The reason why the conical portion 18 is formed on the primary dewatering roller 14 is that the filter cloth belt 1 swells on the side of the bent portion 2 when sludge is supplied. This is to prevent excessive force from acting on the filter cloth belt during pressing. The inclination angle of the conical portion 18 is larger in (a) than in (b).
In other words, the distance L ₁ between the vertical rollers in (a) is larger than the distance L ₂ between the vertical rollers in (b) (L ₁ >).
L ₂ ). Therefore, the cross-sectional area of the portion surrounded by the vertical roller 15 and the horizontal roller 16 is larger in the cross-sectional area A ₁ in (a) than in the cross-sectional area A _{2 in} (b) (A ₁ > A ₂ ). The columnar portion 17 of the vertical roller 15 has an action of sandwiching the opening 3 of the filter cloth belt 1 to prevent sludge from jumping out during pressing. Particularly, the side of the filter cloth belt 1 is coated with rubber or the like 19
Therefore, the adhesion at the opening 3 is good.
Further, the conical portion 17 of the vertical roller 15 has a function of pressing the filter cloth belt 1. When the filter cloth belt 1 is squeezed by the conical portion 18, the filter cloth belt 1 receives a large downward force, so that the horizontal roller 16 applies a reaction force to the bent portion 2 of the filter cloth 1 to filter the cloth. It prevents unreasonable force from acting on the belt 1.

On the other hand, the primary dewatering roller 1 shown in FIG.
4 is composed of an upper large-diameter cylindrical portion 20 and a lower small-diameter cylindrical portion 21. The large-diameter columnar portion 20 has an action of sandwiching the opening 3 of the filter cloth belt 1 to prevent sludge from jumping out, and the small-diameter columnar portion 21 has a function of sandwiching the filter cloth belt 1. Since the cross-sectional area A ₃ between the pair of small-diameter cylindrical portions 21 is smaller than the cross-sectional area A ₂ of the primary dewatering roller 14 in (b), after all, A ₁
There is a relation of> A ₂ > A ₃ . Therefore, as the filter cloth belt 1 travels in the direction of the arrow X, it is gradually squeezed by the three sets of the primary dewatering rollers 14 as shown in (a), (b) and (c), and the water content of the sludge is reduced. It drops and is dehydrated primarily. The primary dewatering rollers 14 do not necessarily have to be three sets.

The filter cloth belt 1 hung on the squeezing drive roller 4 has the opening 3 on the upper side, but before reaching the driven roller 5, the opening 3 faces downward on the reversing portion 22. A sludge discharge unit 8 is provided between the reversing unit 22 and the driven roller 5.
6 and 7 show the sludge discharge unit 8, and FIG.
FIG. 7 is a sectional view taken along the line AA of FIG. A pair of conical lower opening rollers 23 are arranged inside the filter cloth belt 1 with a space therebetween, and the opening 3 of the filter cloth belt 1 is spread by the lower opening roller 23 so as to be widely opened. Open. In the sludge discharge unit 8, as shown in FIG. 6, the opening 3 has an inverted V-shaped cross section.
Is facing down and has a wide mouth, so dehydrated cake 2
4 easily peels from the filter cloth. In order to wash away the sludge attached to the filter cloth after the dehydrated cake 24 is peeled off, a set of cleaning devices 25 is provided as shown in FIG. 7. Since the filter cloth belt 1 is sprayed with washing water from the surface opposite to the surface on which sludge is attached, turbid matter, organic matter,
Heavy metals are less likely to be accumulated inside the filter cloth, and it is possible to prevent deterioration of the filtering ability.

The filter cloth belt 1 hung on the driven roller 5.
The filter cloth belt 1 is twisted by 180 degrees at the reversing portion 6, so that the opening portion 3 rolls from the lower side to the upper side. The filter cloth belt 1 is in a state in which the opening 3 is closed up to the pair of nipping rollers 26, and the opening 3 is opened by the sludge supply unit 7. The reversing portions 6 and 22 are provided with guide rollers that guide and hold the filter cloth belt in order to smoothly reverse the filter cloth belt, but they are not shown.

Next, the operation of this sludge dewatering device will be described. When the variable speed motor is turned on, the squeezing drive roller 4 rotates and the filter cloth belt 1 travels in the direction of arrow X in FIG. In the sludge supply unit 7, the filter cloth belt 1 opens its mouth largely by the action of the upper opening roller 11, and the sludge 13 is supplied into the filter cloth belt 1 from the supply pipe 12 protruding toward the opening 3. The sludge 13 is received by the bent portion 2 and is gradually dehydrated by its own weight. Then, when the filter cloth belt 1 passes between the three sets of the primary dewatering rollers 14, the sludge 13 is gradually dewatered as the interval between the pair of primary dewatering rollers 14 gradually narrows. . And
The thickness of the sludge passing through (c) of FIG. 5 is made uniform.

Next, the sludge that has been primarily dehydrated reaches the pressing drive roller 4 while being held between the filter cloth belts 3 and 4. In the squeezing drive roller 4, the filter cloth belt 1 runs outside the plurality of planetary rollers 10 while being tense, and is sequentially subjected to shearing force by the planetary rollers 10. At this time, planetary roller 1
The contact portion between the planetary roller 10 and the filter cloth belt 1 moves by the relative speed generated by the difference between the revolution speed of 0 and the running speed of the filter cloth belt 1, and the number of shears by the planetary roller 10 can be increased. Dehydration is performed.

The sludge thus subjected to the primary dehydration and the shear dehydration becomes the dehydrated cake 24. Dehydrated cake 24
While being sandwiched by the filter cloth belt 1, it reaches the reversing portion 22, and the opening 3 turns from the upper side to the lower side. And dehydrated cake 2
4 reaches the sludge discharge part 8. In the sludge discharge part 8, the opening 3 of the filter cloth belt 1 is on the lower side, and the mouth of the opening 3 of the filter cloth belt 1 is widened by the lower opening roller 23, so that it is sandwiched by the filter cloth belt 1. Dehydrated cake 24
Is easily peeled off from the filter cloth belt 1 by its own weight and dropped on the conveyor.

Next, the filter cloth belt 1 receives the washing water from the washing device 25 and is washed thoroughly. The cleaning water contained in the filter cloth belt 1 is removed while the filter cloth belt 1 travels around the driven roller 5. Subsequently, the filter cloth belt 1 reaches the reversing portion 6, and the opening 3 of the filter cloth belt 1 rolls from the lower side to the upper side while being guided by the reversing guide roller (not shown). Then, the filter cloth belt 1 with the opening 3 on the upper side
Will reach the sludge supply unit 7 to receive the sludge supply.

Although one embodiment of the sludge dewatering device according to the present invention has been described above, it is not limited to the above. For example, the primary dewatering roller 14 will be described. Instead of the horizontal roller shown in FIGS.
You may employ the horizontal roller 27 as shown in FIG. That is, the horizontal roller 27 of FIG. 8 is rotatably supported by a support shaft 29 suspended from above by an expansion / contraction device 28 such as a spring. Since the horizontal roller 27 is supported by the expansion / contraction device 28 so as to be movable up and down, when a sudden force is applied to the filter cloth belt 1 during the primary dehydration, the force is buffered and an excessive force is applied to the filter cloth belt 1. You can prevent it from working.

The primary dewatering roller 14 is shown in FIGS.
0 or as shown in FIG. The primary dewatering roller 14 in FIG. 9 is composed of a cylindrical portion 17 and a conical portion 18, and a draining groove 31 is formed upright in the conical portion 18, which may be used in place of FIG. 5 (a) or (b).
When the filter cloth belt 1 is squeezed by the primary dewatering roller 14, the filtrate that has passed through the surface of the filter cloth and appears on the surface of the filter cloth flows out in the direction of gravity through the draining groove 31 of the primary dewatering roller 14, It is smoothly discharged from the filter cloth belt 1.

Further, when a primary dewatering roller 14 as shown in FIG. 10 is used instead of the primary dewatering roller 14 shown in FIGS. 5A, 5B, or 9, the drainage is further improved. That is, the primary dewatering roller 14 is a conical ceramics roller 32.
When the dry air is sent from the upper surface side into the holes 33 formed in the upper part, wet air comes out from the lower side, so that the draining effect is improved.

The primary dewatering roller 14 shown in FIG. 11 corresponds to FIG. 5C, and has a spiral groove formed in the lower part of the columnar portion. The spiral grooves 34 of the pair of primary dewatering rollers are screwed together at intervals. Therefore,
The primary dewatering roller 14 in FIG. 11 has a larger dewatering effect than the simple columnar dewatering roller 14 as shown in FIG. 5C because the contact surface with the filter cloth belt 1 is larger.

In the above embodiment, the filter cloth belt 1 is not provided inside the folded filter cloth, but as shown in FIGS. 12 and 13, inside the filter cloth, the filter cloth belt 1 is arranged in the longitudinal direction of the filter cloth. It is advisable to provide orthogonal partitions 35. FIG. 12 is a side view of the filter cloth belt, and FIG. 13 is a partially cutaway perspective view of the filter cloth belt.
The partition member 35 is formed by sewing a plurality of partition cloths made of filter cloth on the inside of the filter cloth belt 1 so as to be foldable. When the opening 3 of the filter cloth belt 1 is opened greatly, the partition member 35 is separated. The member 35 spreads in a fan shape. The sludge 13 supplied into the filter cloth belt 1 in the sludge supply unit 7 is squeezed by the primary dewatering roller 14, but due to the squeezing force,
The sludge tends to move in the traveling direction of the filter cloth belt 1 and in the opposite direction. Therefore, the squeezing force is not sufficiently transmitted to the sludge,
Although the dehydration function is not perfect, the partition member 35
Since the sludge is prevented from moving in the longitudinal direction, the dewatering function is considerably improved.

In the above embodiment, as the partition member 35,
A partition cloth made of the same material as the filter cloth belt 1 is used, but a material having a high elasticity such as rubber may be used as the partition member. As long as the sludge can prevent the filter cloth belt 1 from moving in the longitudinal direction by the partition member 35 and does not hinder the opening of the opening 3 in the sludge supply unit 7 and the sludge discharge unit 8, the partition 35 can be used. Any material and shape may be used.

Further, in the above embodiment, the filter cloth belt is mounted on the two vertical rollers extending in the vertical direction, but it may be mounted on a large number of roller groups, or the roller groups are not necessarily in the vertical direction. It does not have to extend to.
For example, the filter cloth belt may be hung on a horizontal shaft roller extending in the horizontal direction. In that case, the sludge supply unit may be provided in a portion where the filter cloth belt runs horizontally,
Alternatively, the filter cloth belt may be provided at an inclined portion such as an inverted portion of the filter cloth belt. Also, the sludge discharge unit may be provided in the reversing unit. If the sludge adheres to the filter cloth belt after the sludge is peeled off, a scraping scraper for scraping the sludge may be installed.

[0035]

Since the present invention is constructed as described above, it has the following effects. That is, in the sludge dewatering device of the present invention, the endless filter cloth belt to be applied is formed by forming a band-like filter cloth at the closing portion whose one side edge in the longitudinal direction is closed and at the opening portion whose other side edge is open. The opposite filter cloth portion is formed. For example, a band-shaped filter cloth is folded in two in the longitudinal direction to form a bent portion and an opening. Moreover, the other end is twisted by 360 degrees with respect to one end of the filter cloth belt, and the twist is separately twisted by 180 degrees, and both ends of the filter cloth are connected to produce an endless filter cloth belt. Therefore, the fluid sludge supplied into the filter cloth belt is received by the bent portion and stored in the filter cloth belt. Therefore, when squeezing the fluid sludge, if the squeezing force is applied from the opening side of the filter cloth belt to the bent portion side, the sludge can be prevented from flowing out from the filter cloth belt.

The sludge stored inside the filter cloth belt is gradually dehydrated by the dewatering roller installed for draining, and the water content in the sludge gradually decreases, and eventually becomes a dehydrated cake. Therefore, by performing primary dewatering with such a sludge dewatering device, it becomes possible to deal with non-chemically injected sludge.

In such chemical-free dehydration, it is important to remove the dehydrated cake from the filter belt. According to this invention, since the filter cloth belt folded in half has a half-rotated portion with the opening facing downward, dewatering can be performed by simply expanding a part of the portion (sludge discharge part). The cake falls by its own weight quickly. Therefore, it is not necessary to provide a special device for separating the dehydrated cake from the filter cloth belt, and the structure of the sludge dehydrator is simplified.

During dewatering, the sludge in the filter cloth belt tends to move in the traveling direction and the reverse direction of the filter cloth belt due to the pressing force. However, according to the invention of claim 4, since the partition is provided inside the filter cloth belt at a right angle to the longitudinal direction of the filter cloth belt, the movement of the sludge is prevented by this partition. Therefore, the dehydration process of the sludge by the dehydration roller can be performed more efficiently as compared with the case where the partition is not provided.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a manufacturing process of a filter cloth belt of a sludge dewatering device according to the present invention.

FIG. 2 is a perspective view showing a completed filter cloth belt.

FIG. 3 is a plan view showing an embodiment of a sludge dewatering device according to the present invention.

FIG. 4 is a perspective view showing a sludge supply unit in the sludge dewatering device of FIG.

5 is a perspective view showing a primary dewatering roller in the sludge dewatering device of FIG. 3. FIG.

6 is a cross-sectional view taken along line AA of the sludge discharge section shown in FIG.

FIG. 7 is a cross-sectional view taken along line BB of the sludge discharge unit shown in FIG.

FIG. 8 is a perspective view showing a first modified example of the primary dewatering roller.

FIG. 9 is a perspective view showing a second modified example of the primary dewatering roller.

FIG. 10 is a perspective view showing a third modified example of the primary dewatering roller.

FIG. 11 is a perspective view showing a fourth modified example of the primary dewatering roller.

FIG. 12 is a side view showing a modified example of the filter belt.

13 is a perspective view of the filter cloth belt shown in FIG. 12. FIG.

FIG. 14 is a side view showing a conventional sludge dewatering device.

[Explanation of symbols]

1 Filter cloth belt 2 Folding part 3 Opening part 4 Squeezing drive roller (first vertical axis roller, shear dewatering part) 5 Driven roller (second vertical axis roller) 7 Sludge supply part 8 Sludge discharge part 14 Primary dewatering roller 35 Partition member S Shear dewatering unit

Claims (4)

[Claims] 1. A closed portion in which a plurality of roller groups are respectively movably hooked and connected endlessly in a state of being inverted by 180 degrees at two points on the way, and one side edge in the longitudinal direction is closed and the other side. One endless filter cloth belt having an opposed filter cloth part formed in an opening with an open edge, and the opposed filter cloth part by face-to-face polymerization of parts of the opposed filter cloth part of the endless filter cloth belt. A shear dewatering unit configured between, a plurality of shearing rollers for applying a shearing force to the sludge for performing shear dewatering by sandwiching the sludge between the opposing filter cloth units by the shear dewatering unit, and among the roller group A sludge dewatering device comprising a drive device for driving at least one roller to drive the endless filter cloth belt. 2. The endless filter cloth belt is characterized in that a bent portion obtained by bending a central portion in the longitudinal direction is formed in the closed portion, and both side edges in the width direction are opposed to each other to form the opening portion. The sludge dewatering device according to claim 1. 3. A first vertical axis roller that movably hangs the filter cloth belt with the opening facing upward, and hangs the filter cloth belt movably with the opening facing downward. A second vertical axis roller, a sludge supply part formed by expanding a part of the opening facing upward and supplied with sludge, and formed by expanding a part of the opening facing downward. The sludge dewatering device according to claim 1, further comprising a sludge discharging section for discharging the dehydrated cake. 4. The sludge dewatering device according to claim 1, wherein expandable partition members are provided between the opposed filter cloth portions so as to be spaced apart in the longitudinal direction.