JP2002263625A - Method for treating waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for safely and surely treating incineration ash, sludge or the like. SOLUTION: The bottom part (21) of a protective layer (20) is formed in a molding flask (10). A partition frame is placed on the part (21). Concrete constituting the layer (20) is cast into the outside of the partition frame. The kneaded material of waste and concrete is packed inside the partition frame. Such an intermediate layer (40) is formed by removing the partition frame that the concrete constituting the layer (20) is mixed with the concrete contained in the kneaded material. The layer (20) on the outside and the kneaded material on the inside are integrated with each other by the layer (40).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating waste, and more particularly to a method for safely and surely treating incinerated ash and sludge.

[0002]

2. Description of the Related Art It is widely used to dispose of industrial waste and household garbage by incineration and to dispose of incinerated ash by landfill. Also, sludge collected from rivers and drains is treated by landfill.

[0003] However, incinerated ash and sludge sometimes contain harmful substances such as heavy metals and dioxins. If harmful substances are contained in high concentrations, harmful substances may leak to the environment for some reason. Since there is a risk of polluting the environment, it is necessary to reduce the concentration or detoxification of harmful substances contained in incineration ash or sludge before landfill treatment, which complicates the treatment and increases costs.

[0004] Recently, a method has been proposed in which incineration ash and sludge are kneaded into concrete, and the kneaded material is filled in a concrete protection container prepared in advance and sealed in the concrete protection container. .

[0005]

However, in the above-mentioned closed system, the concrete inside is kneaded with incineration ash and sludge to have different physical properties from the concrete of the protective container, and the internal concrete and the concrete of the protective container are separated. Therefore, if an impact is applied to the protective container for some reason, there is a risk that cracks may enter the protective container made of concrete or the protective container may be damaged, and harmful substances such as incineration ash and sludge may flow out.

[0006] In view of the above problems, the present invention provides a waste disposal method which can safely and reliably treat waste without causing harmful substances contained in the waste such as incinerated ash and sludge to flow out. The task is to provide.

[0007]

SUMMARY OF THE INVENTION Accordingly, a method for treating waste according to the present invention is a method of solidifying powdery, granular, small or muddy waste with concrete and treating the waste in the form of a box having an open top surface. Concrete is cast at a predetermined thickness into the formwork to form a bottom of the protective layer, and a flat closed partition having a predetermined thickness is placed on the bottom of the protective layer in the formwork. Along with placing concrete forming a protective layer between the partition frame and the formwork, and mixing the waste and concrete kneaded material inside the partition frame with a height substantially equal to the concrete forming the protective layer or Fill it to a height less than that, raise the partition frame to a height almost equal to or higher than the height of the concrete that forms the protective layer, and mix the concrete that forms the protective layer with the concrete in the kneaded material. After forming the intermingled intermediate layer,
The cast concrete and the filled kneaded material are solidified,
The solidified product of the outer protective layer and the inner kneaded material is integrated with each other by an intermediate layer.

One of the features of the present invention is that concrete forming a protective layer is cast outside and a kneaded material of waste and concrete is filled inside, and then a partition plate between the two is lifted up. The point is that both concretes are mixed in the gap to form an intermediate layer.

[0009] Thus, the outer protective layer and the inner kneaded material are integrated by the intermediate layer to form an integral concrete block as a whole. Therefore, even if any impact is applied to the outer protective layer, the inner kneaded layer will form the outer protective layer. It reinforces and absorbs shocks as a whole, and does not crack or damage the outer protective layer.

[0010] As a result, even when the waste such as incineration ash or sludge contains a high concentration of the hazardous substance, there is no danger of the hazardous substance leaking into the environment, and the safety of the waste disposal can be greatly improved. Becomes

The present invention has a great effect when applied to the treatment of incinerated ash and sludge. However, the present invention can be similarly applied to the treatment of small pieces of waste such as fluorescent lamps and cathode ray tubes, and mercury and cathode ray tubes of fluorescent lamps. These wastes can be treated while reliably preventing lead from flowing into the environment.

The concrete layer may be fixed over the protective layer and the kneaded material by covering it, but it is preferable to form a protective layer cover portion in which concrete is cast.

The partition frame may be lifted after the concrete of the protective layer and the kneaded material of waste and concrete are substantially solidified, but the intermediate layer is not formed well.
There may be a step in physical properties between the two. Therefore,
When the concrete of the protective layer is cast and lifted immediately after filling the kneaded material, the concrete from the kneaded material and the concrete from the protective layer side mix well,
A strong intermediate layer can be formed.

It is also possible to perform the casting of the concrete constituting the protective layer, the filling of the kneaded material, and the lifting of the partition frame only once to form a lid for the protective layer thereon.
There is a possibility that bubbles may be mixed into the concrete and the strength may be reduced. Therefore, the casting of the concrete constituting the protective layer, the filling of the kneaded material, and the raising of the partition frame are repeated over almost the entire height of the formwork, and then the concrete is poured into the upper end portion of the formwork to form the kneaded material on the inner side. Should be sealed in the protective layer.

The bottom of the protective layer may be flat. However, if unevenness is formed on the bottom surface, the adhesion between the waste and concrete kneaded material and the bottom of the protective layer is increased, and the protective layer is kneaded. An object can be firmly integrated, and the impact resistance can be further improved. That is, it is preferable that the bottom surface of the protective layer is formed in an uneven shape so that the kneaded material and the bottom of the protective layer are in close contact with each other.

Further, in order to increase the overall strength, a reinforcing reinforcing bar may be arranged between the formwork and the partitioning frame.

In the case of treating pulverized low radioactive waste or incinerated ash, radioactive contamination is a concern. In such a case, a layer having a property of blocking radiation, for example, a layer of stainless steel or lead may be formed on the outer surface of the protective layer.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to specific examples. FIG. 1 and FIG. 2 schematically show a preferred embodiment of a waste disposal method according to the present invention. When processing wastes such as incinerated ash and sludge of industrial waste and household waste, crushed pieces of fluorescent lamps and cathode ray tubes, etc., these powdery, granular or muddy wastes are mixed with ready-mixed concrete. As shown in FIG. 2 (a), a box-shaped formwork 10 having an open upper surface is formed in a flat rectangular shape, for example, 1 m long, 1 m wide,
It is assembled to a height of 1 m, and the back is reinforced with a reinforcing pipe 11. The mold 10 may have another planar shape, for example, a circular shape.

Next, concrete is poured into the mold 10 at a predetermined height, for example, a height of 15 cm, and the surface is formed unevenly except for a flat surface having a width of about 10 cm outside. Build the bottom 21 of

When the bottom 21 of the protective layer 20 can be constructed, as shown in FIG. 2B, a flat rectangular shape smaller than the mold 10 by a predetermined dimension, for example, 80 cm long, 80 cm wide and 15 to 15 cm high. A partition frame 12 of about 20 cm is placed on the bottom 21 of the protective layer 20. The partition frame 12 preferably has a planar shape similar to the mold frame 10, but may have another planar shape as long as strength can be secured.

Then, concrete is poured into the outside of the partition frame 12 to a predetermined height, for example, about 10 cm, and the inside of the partition frame 12 is approximately equal to the concrete height of the protective layer 20 into which the above-mentioned kneaded material is placed. Fill to a height, for example, about 10 cm.

When the concrete has been poured into the protective layer 20 and the kneaded material has been filled, the partition frame 12 is pulled up by about 10 cm. Then, the concrete contaminated by the waste is leached outward from the inner kneaded material into the gap where the partition frame 12 is lifted, and clean concrete is leached inward from the outer protective layer 20, so that both concretes are leached. The intermediate layer 40 can be mixed.

The concrete of the intermediate layer 40 is shown in FIG.
As shown in (c), the outer concrete 22 has such a characteristic that the dirt continuously rises from the outer concrete 22 toward the inner kneaded material 30, and the outer concrete 22 and the inner kneaded material 30 are strongly integrated. Becomes

Thereafter, the casting of the outer concrete 22 and the filling of the kneaded material, and the construction of the intermediate layer 40 by raising the partition frame 12 are repeated up to a predetermined height of the mold frame 10, and finally the partition frame 12 is removed. Concrete is poured into the upper end portion of the mold 10 and when the concrete solidifies, the form 1
Remove 0.

Then, as shown in FIG. 1, the outside of the kneaded material 30 obtained by kneading and solidifying the waste and the concrete is sealed by the protective layer 20 made of concrete via the intermediate layer 40 having an adhesive function. The resulting structure is obtained.

The outer protective layer 20 and the inner kneaded material solidified body 3
0 is substantially integrated with the intermediate layer 40 to form an integral concrete block as a whole. Therefore, even if any impact is applied to the protective layer 20, the kneaded kneading layer 30 is hardened.
However, the protective layer 20 reinforces the protective layer 20 and absorbs impact as a whole, so that the protective layer 20 is not cracked or the protective layer 20 is not damaged.

As a result, even when the waste contains a high concentration of harmful substances such as heavy metals and dioxins, there is no risk of the harmful substances leaking into the environment, and the safety of the waste treatment can be guaranteed.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a preferred embodiment of a waste disposal method according to the present invention.

FIG. 2 is a diagram schematically showing a structure obtained in the embodiment.

[Description of Signs] 10 Formwork 20 Protective layer 21 Bottom of protective layer 22 Side of protective layer 23 Cover of protective layer 30 Kneaded material 40 Intermediate layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C02F 11/00 101 B09B 3/00 ZAB

Claims (4)

[Claims] 1. When powdery, granular, small or muddy waste is solidified with concrete and treated, concrete is poured into a box-shaped form with an open upper surface to a predetermined thickness to protect it. Forming a bottom of the layer, placing a flat closed partition having a predetermined thickness on the bottom of the protective layer in the mold, and forming a protective layer between the partition and the mold. And
The inside of the partition frame is filled with the kneaded material of waste and concrete to a height substantially equal to or less than the height of the concrete constituting the protective layer, and the height of the concrete constituting the protective layer substantially fills the partition frame. After raising to a height approximately equal to or higher than the height, and forming an intermediate layer in which the concrete constituting the protective layer and the concrete in the kneaded material are mixed, the cast concrete and the filled kneaded material are solidified, A method for treating waste, wherein a solidified product of an outer protective layer and an inner kneaded material is integrated with each other by an intermediate layer. 2. The casting of the concrete constituting the protective layer, the filling of the kneaded material, and the lifting of the partition frame are repeated by a predetermined height over substantially the entire height of the mold frame. 2. A concrete material is poured into an upper end portion to seal an inner kneaded material in a protective layer.
Waste treatment method as described. 3. The method for treating waste according to claim 1, wherein the bottom surface of the protective layer is formed in an irregular shape so that the kneaded material and the bottom of the protective layer are brought into close contact with each other. 4. The waste disposal method according to claim 1, wherein a reinforcing reinforcing bar is arranged between the formwork and the partitioning frame.