JPH0889999A - Bag for dehydrating sludge and dehydrating method of sludge - Google Patents

Abstract

PURPOSE: To dehydrate a large amount of sludge at a time without causing a substantial increase in thickness, a rise in cost and a generation of burst. CONSTITUTION: The inner layer 2 of a tubular bag 1 for dehydrating sludge having internal and external two-layer structure is composed of nonwoven fabric high in corrosion resistance and tear resistance and capable of permeating only water and the outer layer is composed of woven fabric high in corrosion resistance and tensile strength and capable of permeating only water. The bag 1 comes to possess both high tear resistance and high tensile strength, and even if a diameter of the bag 1 for dehydration is enlarged so as to treat large amount of the sludge at a time and thus large tensile stress is allowed to act on the bag 1 for dehydration, since sufficient tensile strength is ensured for the bag 1 by the nonwoven fabric, a burst of the bag 1 is prevented without increasing markedly its thickness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge dewatering bag having a large diameter and a sludge dewatering method using the same.

[0002]

2. Description of the Related Art Among what are commonly called sludge,
There is sludge accumulated at the bottom of sewage channels, rivers, ponds, sea, etc. To treat this sludge, first of all, the dehydration treatment to remove the water contained in these is indispensable. Was made by the mechanical device of.

However, when the dehydration treatment of sludge is carried out by a mechanical device as described above, the mechanical device is expensive, and therefore, especially on a small scale (the sludge treatment amount is 10 m ^{3 to} 5000).
There is a problem in that the dehydration treatment of m ³ ) is expensive.

When the dehydration treatment is carried out by a mechanical device,
It was necessary to remove foreign matters such as stones, empty cans, cloth, and plastic bags contained in the sludge in advance, which was a difficult task.

Therefore, a method has been proposed in which the sludge is dehydrated by using a sludge dehydration bag instead of using a mechanical device. In this method, as shown in FIG. 11, the peripheral edge of the opening of the other end of the tubular sludge dewatering bag 101 with one end closed is supported by the support frame 1.
The sludge 107 is attached to the sludge injection pipe 106 and the sludge 107 is put into the sludge dehydration bag 101 to dehydrate the sludge 107.

However, since the sludge dewatering bag 101 is conventionally made of a woven fabric or a film which is easy to tear, the sludge dewatering bag 101 is easily torn by a sharp portion such as a stone or an empty can contained in the sludge 107. However, there was a problem that normal processing could not be performed.

[0007] Therefore, the applicant has proposed a sludge treatment method using a sludge dewatering bag made of a plastic non-woven fabric such as polyester, polypropylene, acryl, nylon, etc., which has high corrosion resistance and tear resistance and allows only water to permeate. It was previously proposed (see Japanese Patent Laid-Open No. 2-157099).

[0008]

However, according to the above method, there is a problem that the work efficiency is poor because the amount of sludge to be processed at one time is small.

In order to solve the above problem, a method of increasing the diameter of the sludge dewatering bag and inserting a large amount of sludge into the sludge dewatering bag at one time can be considered first.

However, if the diameter of the sludge dehydration bag is increased and a large amount of sludge is put into the sludge dehydration bag at the same time, an excessive tensile stress acts on the sludge dehydration bag to provide sufficient tensile strength. No sludge dewatering bag could burst.

In order to prevent the above burst, it is sufficient to increase the thickness of the sludge dehydration bag. However, if the thickness is increased, not only the sludge dehydration bag becomes heavy and the workability deteriorates, but also the cost of the sludge dehydration bag increases. The problem of inviting occurs. The present invention has been made in view of the above problems, and the object thereof is to dehydrate a large amount of sludge at a time without causing a large increase in thickness, cost increase, and occurrence of burst. It is to provide a sludge dehydration bag and a sludge dehydration method using the same.

[0012]

In order to achieve the above object, the invention according to claim 1 has one of an inner layer and an outer layer of a tubular sludge dewatering bag having an inner and outer two-layer structure, which has high corrosion resistance and tear resistance and water content. It is characterized in that it is made of a non-woven fabric that allows only water to pass through, and the other is made of a woven fabric that has high corrosion resistance and high tensile strength and allows only water to pass through.

According to a second aspect of the present invention, plastic film-like wariffs are adhered in a grid pattern to the outer surface of a tubular bag body made of a non-woven fabric having high corrosion resistance and tear resistance and allowing only water to pass therethrough. It is characterized by constituting a dehydration bag.

According to a third aspect of the present invention, both ends of a tubular sludge dewatering bag formed by including a non-woven fabric having high corrosion resistance and tear resistance and allowing only water to permeate are closed, and a sludge injection pipe is inserted into the sludge dewatering bag. The sludge is dehydrated by injecting the sludge into the sludge dehydration bag from the sludge injection pipe.

The invention according to claim 4 is characterized in that, in the invention according to claim 3, a plurality of the sludge injection tubes are inserted into the sludge dehydration bag at appropriate intervals in the longitudinal direction thereof.

[0016]

According to the invention described in claim 1, since the sludge dehydration bag has an inner and outer two-layer structure composed of a non-woven fabric having high tear resistance and a woven fabric having high tensile strength, the non-woven fabric and the woven fabric have respective disadvantages. On the other hand, they complement each other in the other advantage, and as a result, the sludge dehydration bag has both high tear resistance and high tensile strength.

Therefore, the diameter of the sludge dewatering bag is increased so that a large amount of sludge can be treated at one time. Therefore, even if a large tensile stress acts on the sludge dewatering bag, the sludge dewatering bag does not Since sufficient tensile strength is ensured by the nonwoven fabric, bursting of the sludge dehydration bag can be prevented without significantly increasing the thickness thereof. Further, since the thickness of the sludge dewatering bag is not required to be significantly increased, it is easy to handle and the workability is good, and the cost increase of the sludge dewatering bag can be suppressed.

According to the second aspect of the present invention, the sludge dewatering bag has a high tear resistance due to the non-woven fabric and a high tensile strength due to the wariff at the same time. Therefore, the same effect as that of the first aspect can be obtained. .

According to the third aspect of the present invention, the sludge is dehydrated by relatively easily injecting the sludge into the sludge dehydration bag from any position in the longitudinal direction of the sludge dehydration bag using the sludge injection pipe. be able to.

According to the fourth aspect of the present invention, since the sludge can be simultaneously injected into the sludge dehydration bag by using a plurality of sludge injection tubes arranged in the longitudinal direction of the sludge dehydration bag, a considerably long sludge can be injected. Even with a dehydration bag, a large amount of sludge can be injected into the bag at one time for dehydration processing, further improving the processing capacity.

[0021]

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

<First Embodiment> FIG. 1 is a cross-sectional perspective view of a sludge dewatering bag according to this embodiment, FIG. 2 is a cross-sectional view showing how sludge is put into the sludge dewatering bag, and FIG. FIG. 4 is a sectional perspective view of the sludge dewatering bag, and FIG. 4 is a cutaway perspective view showing a deployed state of the sludge dewatering bag.

The sludge dehydration bag 1 according to the present invention is a tubular bag having an inner-outer two-layer structure as shown in FIG.
The inner layer 2 is made of a non-woven fabric made of polyester, acrylic, polypropylene, nylon, glass, carbon or the like or a mixture thereof which has high corrosion resistance and tear resistance and is permeable to only water, and the outer layer 3 has a smooth surface and corrosion resistance and It is made of a woven fabric that has high tensile strength and allows only moisture to pass through. As the material of the woven cloth, the same material as the above-mentioned material of the non-woven cloth is selected.

In the production of the sludge dewatering bag 1, the band-shaped nonwoven fabric is rolled into a tubular shape, and the ribbon-shaped tape 4 is adhered to the outer periphery of the butted portion to form the inner layer 2.

Next, if the outer surface of the tubular inner layer 2 is covered with a band-shaped woven cloth having a thickness smaller than that of the non-woven fabric, and the outer layer 3 is formed by sewing the mating portion of the woven cloth, The sludge dewatering bag 1 having an inner and outer two-layer structure with the inner layer 2 and the outer layer 3 is obtained.

Next, a sludge dewatering method using the sludge dewatering bag 1 will be described with reference to FIGS. 2 to 4.

In the sludge dehydration process, as shown in FIG. 2, one end of the sludge dehydration bag 1 is folded back and attached to the support frame 5. Then, the sludge 7 is injected from the sludge injection pipe 6 into the inside of the folded back portion of the sludge dehydration bag 1.

Then, the sludge dewatering bag 1 advances in the direction of the arrow in FIG. 2 while being reversed by the pressure (weight) of the sludge 7.
When the sludge dewatering bag 1 is inverted in this way, as shown in detail in FIG. 3, the inner layer 2 of the sludge dewatering bag 1 is located on the outer side and the outer layer 3 is located on the inner side. Moisture contained in 7 penetrates through the mesh of the woven fabric forming the outer layer 3 and the non-woven fabric forming the inner layer 2 and oozes to the outside, so that the sludge 7 is dehydrated without using an expensive mechanical device. In addition, sled 7 has a pond,
Includes sludge accumulated at the bottom of lakes, rivers, seas, dams, and mud generated during construction work.

By the way, the dehydrated sludge 7 is used for, for example, revetment work while being packed in the sludge dehydration bag 1. However, as shown in FIG. If the sludge dewatering bag 1 is passed between the plurality of guide pillars 8 that are erected along the coastal shape of the sea, pond, etc. while reversing and determining the traveling direction of the sludge dewatering bag 1 using the tow belt 9, The sludge dehydration bag 1 is arranged in a curved shape along the coastal shape. As a result, the injection of the sludge 7 into the sludge dewatering bag 1 and the disposition of the sludge dewatering bag 1 are efficiently performed in parallel.

Thus, according to this embodiment, since the sludge dehydration bag 1 has an inner and outer two-layer structure composed of a non-woven fabric having high tear resistance and a woven fabric having high tensile strength, the non-woven fabric and the woven fabric are disadvantageous to each other. The points complement each other in the other advantage, and as a result, the sludge dehydration bag 1 is provided with both high tear resistance and high tensile strength.

Therefore, the sludge dewatering bag 1 is made large in diameter so that a large amount of sludge 7 can be processed at a time. Therefore, even if a large tensile stress acts on the sludge dewatering bag 1, the sludge dewatering bag 1 is processed. Since the bag 1 has a sufficient tensile strength secured by the non-woven fabric, the sludge dehydration bag 1 can be prevented from bursting without significantly increasing the thickness thereof. Further, since the thickness of the sludge dewatering bag 1 is not required to be significantly increased, it is easy to handle and the workability is good, and the cost increase of the sludge dewatering bag 1 can be suppressed.

<Second Embodiment> Next, a second embodiment of the present invention will be described with reference to FIGS. 5 is a cross-sectional perspective view of the sludge dehydration bag according to this embodiment, FIG. 6 is a cross-sectional view showing the sludge injecting state into the sludge dehydration bag, and FIG. 7 is an enlarged detail view of a portion A of FIG. [Fig. 3] is a cross-sectional perspective view of a sludge dehydration bag into which sludge has been put.

The sludge dehydration bag 11 according to this embodiment is also shown in FIG.
As shown in FIG. 3, the inner bag 12 is a tubular bag having an inner and outer two-layer structure, but unlike the first embodiment, the inner layer 12 is made of a woven cloth that has a smooth surface, high corrosion resistance and high tensile strength, and allows only moisture to pass therethrough. The outer layer 13 is made of a non-woven fabric having high corrosion resistance and tear resistance and allowing only moisture to pass through.

In the production of the sludge dewatering bag 11, the strip-shaped nonwoven fabric is rolled into a tubular shape, and the ribbon tape 14 is adhered to the outer periphery of the butted portion to form the outer layer 1.
Make up 3.

Next, the inner layer 12 formed into a tubular shape by using a thin woven cloth is drawn into the outer layer 13 so that
Inner layer 12 made of woven fabric and outer layer 1 made of non-woven fabric
With 3, the sludge dehydration bag 11 having an inner and outer two-layer structure is obtained.

A sludge dewatering method using the sludge dewatering bag 11 will be described with reference to FIGS. 6 to 8.

As shown in FIG. 6, both ends of the sludge dewatering bag 11 are tied together with a string 20 and closed, and the tip portion (lower end portion) of the sludge injecting pipe 21 is inserted at an intermediate position in the longitudinal direction of the sludge dewatering bag 11. Here, the detailed configuration of the portion of the sludge dehydration bag 11 into which the sludge injection pipe 21 is inserted will be described with reference to FIG. 7.

That is, as shown in FIG. 7, the sludge dewatering bag 11
A circular hole 13a is formed in a part of the outer layer 13 of the inner layer 12, and the insertion cylindrical portion 12a formed in the inner layer 12 extends upward through the circular hole 13a of the outer layer 13 to the outside of the outer layer 13. .

The lower end of the sludge injection pipe 21 is inserted into the insertion cylindrical portion 12a of the sludge dewatering bag 11 and is tightened and fixed to the insertion cylindrical portion 12a by the string 22.

Then, if the sludge 17 is put into the receiving container 23 attached to the upper end of the sludge injection pipe 21 from the hose 24, the sludge 17 is charged by its own weight.
It is injected into the sludge dehydration bag 11 through the.

When the sludge 17 is filled in the sludge dehydration bag 11 by the above operation as shown in FIG.
The moisture contained in the woven fabric forming the inner layer 12 and the outer layer 13
Since it penetrates through the mesh of the non-woven fabric constituting the above and oozes to the outside, the dehydration treatment of the sludge 17 can be performed without using an expensive mechanical device also in this embodiment.

As described above, also in this embodiment, since the sludge dewatering bag 11 has the inner and outer two-layer structure composed of the non-woven fabric having high tear resistance and the woven fabric having high tensile strength, it is similar to the first embodiment. The sludge dewatering bag 11 has a large diameter so that a large amount of sludge 17 can be treated at a time, and even if a large tensile stress acts on the sludge dewatering bag 11,
Since the sludge-treated bag 11 has a sufficient tensile strength secured by the nonwoven fabric, bursting of the sludge-dehydrated bag 11 can be prevented without significantly increasing the thickness thereof.

Further, according to the present embodiment, unlike the first embodiment, the work of reversing the sludge dewatering bag 11 is unnecessary,
The sludge 17 can be dehydrated by relatively easily injecting the sludge 17 into the sludge dehydration bag 11 from an arbitrary position in the longitudinal direction of the sludge dehydration bag 11 using the sludge injection pipe 21.

Although not shown, a plurality of sludge injection tubes are inserted into the sludge dehydration bag at appropriate intervals in the lengthwise direction, and the sludge is simultaneously injected into the sludge dehydration bag using these plural sludge injection tubes. By doing so, even with a considerably long sludge dehydration bag, a large amount of sludge can be injected at once to perform the dehydration process, and the processing capacity can be further enhanced.

By the way, in the sludge dewatering method in this embodiment, the sludge dewatering bag 31, as shown in FIG. 9 and FIG.
41 can also be used.

That is, the sludge dewatering bag 31 shown in FIG. 9 is obtained by stacking two strip-shaped woven fabrics and non-woven fabrics, rolling them into a tubular shape, and stacking their mating portions and sewing them together. The inner layer 32 and the outer layer 33 made of a nonwoven fabric constitute an inner-outer two-layer structure. Further, the sludge dehydration bag 41 shown in FIG. 10 has a tubular bag body 42 made of a non-woven fabric having high corrosion resistance and tear resistance and permeable only to water.
A plastic film-like wall 43 is adhered in a lattice pattern.

In the sludge dewatering bag 41, since the wariff 43 functions as a reinforcing member (functions similarly to the woven cloth), the sludge dewatering bag 41 is made of the non-woven fabric forming the bag body 42 and is therefore high. The sludge dewatering bag 41 has a large diameter so that the tear resistance and the high tensile strength of the wall 43 can be secured at the same time and a large amount of sludge can be treated at one time. Despite the action, the warrior 43 ensures sufficient tensile strength in the sludge treatment bag 41. Therefore, bursting of the sludge dehydration bag 41 can be prevented without significantly increasing the thickness of the sludge dehydration bag 41. Further, since the thickness of the sludge dewatering bag 41 is not required to be significantly increased, it is easy to handle and the workability is good, and the cost increase of the sludge dewatering bag 41 can be suppressed.

[0048]

As is apparent from the above description, claim 1
According to the invention described, since the sludge dewatering bag has an inner-outer two-layer structure composed of a highly tear-resistant non-woven fabric and a woven fabric having high tensile strength, it is possible to treat a large amount of sludge at one time. Even if a large tensile stress is applied to the sludge dewatering bag due to its large diameter, the thickness of the sludge dewatering bag is not significantly increased because the sludge dewatering bag has sufficient tensile strength secured by the nonwoven fabric. However, bursting of the sludge dehydration bag can be prevented. Moreover, since the thickness of the sludge dehydration bag is not required to be significantly increased, the sludge dehydration bag can be easily handled and has good workability, and the cost increase of the sludge dehydration bag can be suppressed.

According to the second aspect of the present invention, the sludge dewatering bag has a high tear resistance due to the non-woven fabric and a high tensile strength due to the wariff at the same time. Therefore, the same effect as that of the first aspect of the invention can be obtained. .

According to the third aspect of the present invention, the sludge is relatively easily injected into the sludge dehydration bag from an arbitrary position in the longitudinal direction of the sludge dehydration bag by using an injection pipe to dehydrate the sludge. The effect of being able to do is obtained.

According to the fourth aspect of the present invention, since the sludge can be simultaneously injected into the sludge dehydration bag by using a plurality of injection pipes arranged in the longitudinal direction of the sludge dehydration bag, a considerably long sludge dehydration bag can be obtained. Even in the case of a bag, a large amount of sludge can be injected into the bag at one time for dehydration, and the processing capacity can be further enhanced.

[Brief description of drawings]

FIG. 1 is a sectional perspective view of a sludge dehydration bag according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which sludge is put into a sludge dewatering bag according to the first embodiment of the present invention.

FIG. 3 is a sectional perspective view of a sludge dewatering bag into which sludge has been put.

FIG. 4 is a cutaway perspective view showing a deployed state of a sludge dehydration bag.

FIG. 5 is a sectional perspective view of a sludge dehydration bag according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a state of injecting sludge into a sludge dehydration bag according to a second embodiment of the present invention.

FIG. 7 is an enlarged detail view of a portion A in FIG. 6;

FIG. 8 is a cross-sectional perspective view of a sludge dewatering bag with sludge.

FIG. 9 is a sectional perspective view showing another embodiment of the sludge dehydration bag according to the present invention.

FIG. 10 is a sectional perspective view showing another embodiment of the sludge dehydration bag according to the present invention.

FIG. 11 is a cross-sectional view showing a conventional sludge dewatering method.

[Explanation of symbols]

 1,11 Sludge dehydration bag 2,12 Inner layer 3,13 Outer layer 21 Sludge injection pipe 31,42 Sludge dehydration bag 32 Inner layer 33 Outer layer 42 Bag 43 43 Wallif

Claims (4)

[Claims] 1. A tubular bag having an inner and outer two-layer structure, wherein one of the inner layer and the outer layer is made of a non-woven fabric having high corrosion resistance and tear resistance and allowing only moisture to pass, and the other has high corrosion resistance and tensile strength. A sludge dewatering bag, which is made of a woven fabric that allows only moisture to pass through. 2. A plastic film-like wariff is adhered in a lattice pattern to the outer surface of a tubular bag body made of a non-woven fabric having high corrosion resistance and tear resistance and permeable to only water. A sludge dewatering bag. 3. A tubular sludge dehydration bag composed of a nonwoven fabric having high corrosion resistance and tear resistance and allowing only water to permeate is closed at both ends, and a sludge injection pipe is inserted into the sludge dehydration bag. A sludge dewatering method comprising injecting sludge into a sludge dehydration bag to perform dehydration treatment of the sludge. 4. The sludge dehydration method according to claim 3, wherein a plurality of the sludge infusion pipes are inserted into the sludge dehydration bag at appropriate intervals in the longitudinal direction thereof.