JPH0947797A - Method for treating sludge and sludge treating device using the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently remove the water and air contained in sludge in a short time without causing environmental pollution. SOLUTION: The water and air contained in sludge are removed, and the sludge is regenerated and utilized in banking, etc., by this' method. A drain pipe 2 connected to a vacuum pump 4 is arranged at the bottom of a panel 1, drain materials 7 are laid at regular intervals and brought into contact with the drain pipe 2, the sludge is then wound up over the upper face, and the upper face of a sludge layer 10 is covered with an airtight sheet 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge treating method for removing water and air contained in sludge so that the sludge can be reused as an embankment material, and a sludge treating apparatus using the method. More particularly, the present invention relates to a sludge treatment method capable of efficiently removing water and air contained in sludge in a short period of time without causing pollution problems, and a sludge treatment apparatus using the method.

[0002]

2. Description of the Related Art Conventionally, a method of treating sludge by removing water and air contained in sludge so that it can be reused as a material for embankment includes treating a large amount of sludge and a small amount of sludge. There are two methods.

When a large amount of sludge is to be treated, the sludge mixed with the sedimentation agent at the time of dredging is sprinkled out in a pool and about 1
The thickness is about 0 m. After the surface layer of the sludge layer is hardened by the mixed sedimenting agent, a drain material is driven into the sludge layer at a predetermined interval. Moisture and air contained in the sludge are sucked out to the surface of the sludge layer through the driven drain material, and the sludge layer is gradually solidified.

There is also a method in which lime or cement is mixed in the sludge and water and air are removed from the sludge by utilizing the heat of the hydration reaction of lime, instead of placing the drain material.

On the other hand, when treating a small amount of sludge, a method of removing moisture and air in the sludge by heat using a filter press, or moisture in the sludge by sunlight, aeration, or leaving it naturally There are many methods used to remove air and air. In addition, a method may be adopted in which lime and cement are mixed in the sludge and water and air are removed from the sludge by utilizing heat generated by the hydration reaction of lime.

[0006]

However, in the conventional sludge treatment method, when the drainage material is used to remove the consolidated water in the sludge layer together with the air, the drain material is surrounded by the consolidated water. In addition, solidification may occur due to the removal of air and air, which may block the passage of compacted water and air from the portion of the sludge layer separated from the drain material to the drain material. For this reason, the compacted water and air cannot be removed from the portion of the sludge layer separated from the drain material, which causes a problem that sufficient sludge treatment cannot be performed.

On the other hand, when a filter press is used, the treatment amount is as small as 10 m ³ / day, and in the case of a method such as sunlight or natural standing, it takes 3 to 6 months to completely remove it. Was.

Mixing lime and cement in the sludge,
In the case of the method of removing water and air from the sludge by utilizing the heat from the hydration reaction of lime, the reaction product after solidification becomes industrial waste, and if left as it is, it may cause pollution problems. It was happening.

The present invention has been made in view of the above problems, and a sludge treatment method and a sludge treatment method capable of efficiently removing water and air contained in sludge in a short period of time without causing pollution problems. It is an object of the present invention to provide a sludge treating apparatus using the method.

[0010]

In order to achieve the above object, the invention according to claim 1 is a method for treating sludge by removing water and air contained in the sludge so that the sludge can be reused as a filling material. So, while arranging the drain pipe connected to the vacuum pump at the bottom of the pool, laying the drain material at a predetermined interval so as to come into contact with this drain pipe,
The gist is a method for treating sludge, which is characterized by sprinkling sludge on the upper surface and then covering the upper surface of the sludge layer with an airtight sheet.

A second aspect of the present invention has as its gist a sludge treatment method characterized in that the entire sludge layer is surrounded by a drain material. .

According to the third aspect of the present invention, after the entire sludge layer is surrounded by the drain material, another drain material is connected to the upper portion of the drain material, the sludge is sprinkled out again, and then the sludge is stacked on another drain material. The gist is a method for treating sludge, which is characterized in that the operation of surrounding the whole layer is repeated according to the amount of sludge sprinkled in the pool, and then the uppermost upper surface of the sludge layer is covered with an airtight sheet.

According to a fourth aspect of the present invention, there is provided a sludge treating apparatus for removing water and air contained in sludge so that the sludge can be reused as a filling material, which is connected to a vacuum pump arranged at the bottom of the pool. The drain pipe, a drain material that is laid at a predetermined interval so as to come into contact with the drain pipe, and an airtight sheet that covers the upper surface of the sludge layer sprinkled on the upper surface of the drain material. The sludge processing device is defined as the gist.

A fifth aspect of the present invention has as its gist a sludge treatment device characterized in that strip-shaped drain members are laid at predetermined intervals.

A sixth aspect of the present invention has as its gist a sludge treating apparatus characterized in that strip-shaped drain members are laid vertically and horizontally at predetermined intervals.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The sludge treatment method of the present invention and the sludge treatment apparatus using the method will be described in more detail below. The sludge treated by the treatment method of the present invention is generated during dredging of the lake bottom and refers to liquefied soil having a water content ratio of about 400%. The present invention proposes a novel method for efficiently removing water and air contained in the sludge in a short period of time so that the sludge can be reused as a filling material.

In the sludge treatment method of the present invention (hereinafter simply referred to as a treatment method), a drain pipe connected to a vacuum pump is arranged at the bottom of the pool, and a drain is provided at a predetermined interval so as to come into contact with the drain pipe. There is a step of laying the material, a step of sprinkling sludge on the upper surface of the drain material, and a step of covering the upper surface of the sludge layer with an airtight sheet.

First, as shown in FIGS. 1, 2 and 3, a drain pipe 2 connected to a vacuum pump 4 at the bottom of the pool 1
Place. In addition to the concrete structure shown in FIG. 3, the pool 1 may be a hole formed by simply excavating the ground, or a sheet pile around the hole. The size and shape of the pool 1 are arbitrary and may be appropriately determined according to the amount of sludge to be processed. According to the treatment method of the present invention, the pool 1 can have a size of 10 m × 10 m to a size of 100 m × 100 m. The drain pipe 2 is arranged at the bottom of the pool 1. A vacuum pump 4 is connected to the drain pipe 2 via a vacuum tank 3, and a drain tank 5 is connected to the vacuum tank 3.

The drainage pipe 2 is a pipe body having a large number of holes (not shown), and a fiber sheet 6 such as a non-woven fabric is formed on the peripheral surface thereof.
Is attached to prevent clogging of holes and pipes.
The number of the drainage pipes 2 and the position where they are arranged are arbitrary. In FIGS. 1 and 2, only one is arranged in the length direction of the bottom of the pool 1, but depending on the size and depth of the pool 1, a plurality of pools may be arranged side by side in the vertical direction or in a vertical and horizontal lattice pattern. It can also be arranged in parallel, or can be arranged parallel to the upper and lower parts.

A drain member 7 is laid on the bottom of the pool 1 at a predetermined interval, preferably 0.7 to 1.0 m, so as to come into contact with the drain pipe 2. The drain material 7 is in the form of a strip having a width of 10 to 30 cm. As shown in FIG. 7, the drain material 7 is composed of a net 8 and a fiber sheet 9 laminated on both surfaces thereof. 8 and the fiber sheet 9 and the gaps between the fibers forming the fiber sheet 9 are allowed to enter and move (note that the fiber sheet may be non-woven fabric, woven fabric, knitted fabric, paper, or the like. ), Or similarly, a net may be used in which fiber sheets are laminated and integrated only on one surface side of the net. The distance between the drain members 7 is appropriately changed according to the soil constant.

Further, as shown in FIGS. 8 and 9, the drain material 7 is arranged in a lattice form at intervals of 0.7 to 1.0 m vertically and horizontally, and a net fixed to each intersection is fixed by a stapler 11. It can also be used. In this case, since the entire sludge layer is surrounded by the net, it is possible to remove water and air more efficiently.

There are two ways of connecting the drain member 7 and the drainage pipe 2, as shown in FIGS. 10 and 11, which are a direct connection method and an indirect connection method. The connection example shown in FIG. 10 is an example in which the drain member 7 is directly connected to the drain pipe 2. In this case, both may be simply laminated, but may be fixed to each other with a stopper plate (not shown) or the like. In the example shown in FIG. 11, the drain material 7 is first laid, the drainage pipe 2 is arranged on this, and the sand layer 1 is formed on this.
3 is provided.

As shown in FIGS. 1 and 2, the drain members 7 are laid in parallel in the width direction of the pool 1 at a predetermined interval, preferably 0.7 to 1.0 m. 8 or 9, the drain members 7 are arranged in a grid pattern at predetermined vertical and horizontal intervals, and the nets are fixed by fixing each intersection with a stapler 11. You can The nets shown in FIGS. 8 and 9 may be produced in advance or may be produced on site.

Next, as shown in FIG. 4, sludge is sprinkled on the upper surface of the drain material 7. The amount of sludge spread, in other words, the thickness of the sludge layer 10 is arbitrary. If the sludge layer 10 is thin, the treatment is fast, but the treatment amount per one time is small, and if the sludge layer 10 is thick, the treatment is slow, so consider the required treatment amount. It is good to decide appropriately. Specifically, a thickness of 0.5 to 1.0 m is preferable.

The drain material 7 may be provided only on the bottom of the pool 1, but the drain material 7 may surround the entire sludge layer 10 as shown in FIG. In this case, moisture and air are sucked out not only from the bottom of the sludge layer 10 but also from the side and the top, so that the moisture and air can be removed more efficiently.

The embodiment shown in FIG. 6 is an embodiment in which the thickness of the sludge layer 10 exceeds 1.0 m. In this case,
As shown in FIG. 4, after the entire sludge layer 10 is surrounded by the drain material 7, another drain material 7 is connected to the upper portion of the drain material 7 with a stapler 11 or the like, and the sludge is sprinkled out. Sludge layer 1 piled up in 7
The operation of surrounding the whole 0 is repeated according to the thickness of the amount of sludge scattered on the pool 1. Specifically, the above operation is repeated every time the thickness of the sludge layer 10 exceeds 1 m. A large amount of sludge having a thickness of the sludge layer 10 of up to 10 m can be processed at one time.

Next, as shown in FIG. 5, the upper surface of the sludge layer 10 is covered with an airtight sheet 12. As the airtight sheet, any material such as a synthetic resin sheet or a sheet obtained by laminating a synthetic resin film on the surface of a fiber sheet may be used as long as it is a material that does not allow air to pass therethrough. By covering the upper surface of the sludge layer 10 with this airtight sheet 12, the inside of the pool 1 becomes airtight.

When the vacuum pump 4 is operated, the negative pressure from the vacuum pump 4 passes through the vacuum tank 3 and the drain pipe 2
2 and 5, the moisture and air in the sludge layer 10 are sucked out to the drain material 7 through the drain material 7 connected to the drainage tube 2, as shown by the arrows in FIGS. Drained to the drainage tank 5 through the tank 3,
The water and air contained in the sludge are removed.

When the pool 1 has a large area and the sludge layer 10 has a large thickness, the vacuum pump 4, the vacuum tank 3, and the drain tank 5 connected to the drain pipe 2 shown in FIGS. Can be arranged at several places in the pool 1 to evacuate and suck out moisture and air in the sludge layer 10 from a plurality of places, and more efficient removal of moisture and vacancy can be achieved.

Next, the sludge processing apparatus of the present invention (hereinafter simply referred to as processing apparatus) will be described. This processing device is a device that removes water and air contained in sludge so that it can be reused as an embankment material or the like, and includes a drainage pipe, a drain material, and an airtight sheet.

As shown in FIGS. 1, 2 and 5, the drain pipe 2
Is a tubular body having a large number of holes (not shown), and a fiber sheet 6 such as a non-woven fabric is attached to the peripheral surface thereof to prevent clogging of the holes and the tube. Number of this drain pipe 2,
The position to arrange is arbitrary. Pool 1 in FIGS. 1 and 2
Only one is arranged in the length direction of the bottom part, but depending on the size and depth of the pool 1, a plurality of pools may be arranged side by side in the longitudinal direction, arranged in a vertical and horizontal lattice pattern, or at the top and It can also be placed parallel to the bottom.

A vacuum pump 4 is connected to the drain pipe 2 via a vacuum tank 3, and a drain tank 5 is further connected to the vacuum tank 3. By operating the vacuum pump 4, the vacuum pump 4 can be operated. The negative pressure is transmitted to the drainage pipe 2 through the vacuum tank 3, and the drainage material 7 connected to the drainage pipe 2 evacuates and sucks out moisture and air in the sludge layer 10.

A drain member 7 is laid at the bottom of the pool 1 at a predetermined interval, preferably 0.7 to 1.0 m, so as to come into contact with the drain pipe 2. The drain member 7 is in the form of a strip having a width of 10 to 30 cm, and as shown in FIG. 7, is composed of a net 8 and fiber sheets 9 laminated on both surfaces thereof.
Which penetrates and moves through the gap between the fiber sheet 9 and the fiber sheet 9 and the fiber gap forming the fiber sheet 9 (note that the fiber sheet may be non-woven fabric, woven fabric, knitted fabric, paper, or the like). Alternatively, it is also possible to use a net, and to apply a fiber sheet laminated and integrated only on one side of the net.

Further, as shown in FIGS. 8 and 9, the drain material 7 is arranged in a lattice form at intervals of 0.7 to 1.0 m vertically and horizontally, and is fixed as a net by fixing each intersection with a stapler 11. It can also be used. In this case, since the entire sludge layer is surrounded by the net, it is possible to remove water and air more efficiently.

The drain member 7 and the drainage pipe 2 can be connected to each other by a direct connection method or an indirect connection method, as shown in FIGS. The connection example shown in FIG. 10 is an example in which the drain member 7 is directly connected to the drain pipe 2. In this case, both may be simply laminated, but may be fixed to each other with a stopper plate (not shown) or the like. The example shown in FIG. 11 is a mode in which the drain material 7 is first laid, the drainage pipe 2 is disposed on this, and the sand layer 13 is disposed on this.

An upper surface of the sludge layer 10 sprinkled on the upper surface of the drain material 7 is covered with an airtight sheet 12. As the airtight sheet 12, any material such as a synthetic resin sheet or a fiber sheet laminated with a synthetic resin film may be used as long as it is a material that does not allow air to permeate. By covering the upper surface of the sludge layer 10 with this airtight sheet 12,
The inside of the pool 1 is airtight.

When the vacuum pump 4 is operated, the negative pressure from the vacuum pump 4 passes through the vacuum tank 3 and the drain pipe 2
2 and 5, the moisture and air in the sludge layer 10 are sucked out to the drain material 7 through the drain material 7 connected to the drainage tube 2, as shown by the arrows in FIGS. Drained to the drainage tank 5 through the tank 3,
The water and air contained in the sludge will be removed.

When the pool 1 has a large area and the sludge layer 10 has a large thickness, the vacuum pump 4, the vacuum tank 3, and the drain tank 5 connected to the drain pipe 2 shown in FIGS. Can be arranged at several places in the pool 1 to evacuate and suck out moisture and air in the sludge layer 10 from a plurality of places, and more efficient removal of moisture and vacancy can be achieved.

[0039]

According to the treatment method of the first aspect, the negative pressure from the vacuum pump is reduced by covering the upper surface of the sludge layer with an airtight sheet and keeping the pool airtight and operating the vacuum pump. The water and air in the sludge layer, which is transmitted to the drain pipe via the vacuum tank and is connected to this drain pipe, is sucked out to the drain material to remove the water and air contained in the sludge. Has become. Therefore, it is possible to effectively remove water and air contained in the sludge in a short period of time without causing pollution problems.

In the treatment method according to the second aspect, since the entire sludge layer is surrounded by the drain material, moisture and air are sucked out not only from the bottom portion of the sludge layer but also from the side portion and the upper portion. Therefore, it is possible to remove water and air more efficiently.

According to the treatment method of the third aspect, a large amount of sludge having a thickness of the sludge layer as large as 10 m can be treated at one time.

In the processing apparatus according to the fourth aspect, by covering the upper surface of the sludge layer with an airtight sheet and keeping the inside of the pool airtight and operating the vacuum pump, the negative pressure from the vacuum pump is a vacuum tank. The water and air in the sludge layer are transmitted to the drain pipe via the drain material connected to this drain pipe, and are sucked into the drain material to remove the water and air contained in the sludge. There is.
Therefore, it is possible to effectively remove water and air contained in the sludge in a short period of time without causing pollution problems.

In the processing apparatus according to the fifth aspect, since the belt-shaped drain material is laid at a predetermined interval, a drain material having a size obtained by dividing the entire pool bottom surface or a plurality of pool bottom surfaces is used. Compared to laying, the laying work is easy, and when it is transported, it can be wound in a roll shape and handled, and thus it has excellent handleability.

In the processing apparatus according to the sixth aspect of the present invention, the strip-shaped drain material is laid vertically and horizontally at a predetermined interval, and the entire sludge layer is surrounded by this net. Efficient removal of water and air is possible.

[Brief description of drawings]

FIG. 1 is a sectional view showing the entire sludge processing apparatus of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is an enlarged side sectional view showing a step of the method for treating sludge of the present invention, showing a state in which a drainage pipe and a drain material are arranged in a pool.

FIG. 4 is an enlarged side sectional view showing a state in which sludge is sprinkled on the drain material and the entire sludge layer is surrounded by the drain material.

FIG. 5 is an enlarged side sectional view showing a state in which the upper surface of the sludge layer is covered with an airtight sheet.

FIG. 6 is an enlarged side cross-sectional view showing another aspect of the processing device when the sludge layer is thick.

FIG. 7 is an enlarged main-part sectional view showing a main part of the drain member.

FIG. 8 is an enlarged perspective view showing another usage example of the drain material.

FIG. 9 is an enlarged cross-sectional view showing a state in which the intersections of the drain members arranged in a vertical and horizontal lattice pattern are fixed.

FIG. 10 is an enlarged cross-sectional view showing a connection state between the drain material and the drainage pipe.

FIG. 11 is an enlarged cross-sectional view showing another connection state of the drain material and the drainage pipe.

[Explanation of symbols]

 2 ... Drain pipe 4 ... Vacuum pump 7 ... Drain material 10 ... Sludge layer 12 ... Airtight sheet

Claims (6)

[Claims] 1. A method of treating sludge by removing water and air contained in sludge so that the sludge can be reused as an embankment material, in which a drainage pipe connected to a vacuum pump is provided at the bottom of a pool. A method for treating sludge, characterized in that a drain material is laid at a predetermined interval so as to come into contact with a drainage pipe, sludge is sprinkled on the upper surface of the drain material, and then the upper surface of the sludge layer is covered with an airtight sheet. 2. The method for treating sludge according to claim 1, wherein the entire sludge layer is surrounded by a drain material. 3. An operation of surrounding the entire sludge layer with a drain material, connecting another drain material to the upper portion of the drain material, sprinkling the sludge again, and then surrounding the entire sludge layer stacked with another drain material. 3. The method for treating sludge according to claim 2, wherein after repeating the above procedure in accordance with the amount of sludge sprinkled into the pool, the uppermost upper surface of the sludge layer is covered with an airtight sheet. 4. A sludge treatment device for removing water and air contained in sludge so that the sludge can be reused as an embankment material, and a drain pipe connected to a vacuum pump arranged at the bottom of a pool,
Treatment of sludge, comprising a drain material laid at a predetermined interval so as to come into contact with the drain pipe, and an airtight sheet covering the upper surface of the sludge layer sprinkled on the upper surface of the drain material. apparatus. 5. The sludge treating apparatus according to claim 4, wherein the strip-shaped drain material is laid at predetermined intervals. 6. The drain material in the form of a strip is laid at predetermined intervals in the vertical and horizontal directions.
The sludge treatment device described.