JPH0552915B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is a method for compressing and reducing the volume of, for example, radioactive waste stored in a cylindrical container such as a drum, together with the container, so that it can be stored in an optimal shape for storage. This invention relates to a method for compressing and reducing the volume of solid waste for restoring it in containers.

(Prior Art) Combustible or non-combustible miscellaneous solid waste is usually disposed of in a landfill after being incinerated or compressed depending on its properties. However, radioactive waste contaminated with radioactivity generated from nuclear facilities such as nuclear power plants, nuclear research facilities, nuclear fuel handling facilities, nuclear fuel reprocessing plants, and radioisotope handling facilities, as well as toxic substance manufacturing processes or their handling processes. Toxic waste contaminated by generated toxic substances cannot be disposed of in a landfill, so it is currently stored at the source where it is generated.

In this case, solid waste is normally stored in cylindrical containers such as drums to prevent radioactivity and toxic substances from scattering, but the increase in storage volume In order to save storage space, solid waste is compressed while still being filled in a cylindrical container.

(Problems to be Solved by the Invention) In the volume reduction process described above, the volume of the container itself can be reduced and storage space can be saved to some extent, but the compressed body obtained by the method described above is It is pellet-shaped with a circular cross section, and if it is refilled into a cylindrical storage container and stored, a dead space will be created between the storage containers, increasing the storage space and making it unstable when stacked. It was hot.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for compressing and reducing the volume of solid waste, which eliminates the above-mentioned problems and allows efficient use of storage space.

(Means for Solving the Problems) The method for compressing and reducing the volume of solid waste of the present invention is to combine a cylindrical container filled with solid waste with a cylindrical large-diameter portion with an upper inner circumferential surface. It is compressed with a high-pressure press having a compression sleeve consisting of a small diameter part of a square or hexagonal shape at the bottom and a tapered part at the middle part, and has a large number of longitudinal grooves that engage with protrusions provided on the periphery of the press ram. It is characterized in that the crushed objects have a hexagonal shape, and a plurality of crushed objects are housed and sealed in a storage container having a square or hexagonal cross-sectional shape.

(Function) The present invention is configured to crush the entire cylindrical container filled with waste and store it again in a storage container having a square or hexagonal cross-sectional shape, so that the volume reduction rate is extremely high. and efficient use of storage space can be achieved. Further, when a cylindrical drum is crushed into a square or hexagon, even better filling efficiency can be achieved since the shape matches the cross-sectional shape of the storage container.

(Example) The present invention will be described in detail below with reference to the drawings.

FIGS. 1a to 1e are diagrams showing one embodiment of the compression volume reduction treatment method of the present invention in the order of steps. First, solid waste powder such as radioactive waste to be treated is
It is filled into a cylindrical container 1 such as a drum as shown in FIG. Next, the cylindrical container 1 filled with waste is first compressed in a high-pressure press with a suitable compression sleeve.
Crush as shown in Figure b. Crushed compressed body 2
In this embodiment, the compressed body 2 has a substantially hexagonal shape as shown in FIG. Fill by stacking multiple pieces. After the storage container 3 filled with a plurality of compressed bodies 2 is sealed, it is stored in a storage warehouse or the like without any gaps, as shown in FIG. 1e.

FIGS. 2a to 2e are diagrams showing another embodiment of the compression volume reduction treatment method of the present invention in order of steps. Figure 2 a~
In e, the same members as in FIGS. 1 a to e are given the same reference numerals, and their explanations will be omitted. In this embodiment, as shown in FIG. 2c, the shape of the compressed body 4 is square, and the cross-sectional shape of the storage container 5 is also square. Even if the storage container 5 has a rectangular shape as in this embodiment, it can be stored without any space in a storage container such as a pit, as shown in FIG. 2e.

As the high pressure press machine used in the present invention, the third
As shown in the figure, the inner circumferential surface consists of an upper cylindrical large diameter part 11, a lower part a small diameter part 12 having a desired shape, for example, a square or hexagon, and an intermediate tapered part 13, and the periphery of the press ram 14. protrusion 15 provided on
a compression sleeve 16 provided with a number of longitudinal grooves that engage the
A high-pressure press machine 17 having the following is preferable because it can perform accurate compression and volume reduction processing by preventing extrusion and spouting of solid waste during the compression process. In addition, in the present invention, the cross-sectional shape (outer shape) of the storage container is limited to a square or hexagonal shape, so that when the compressed material is filled therein and stored in a storage location such as a pit, the dead space is reduced and This is because it is the most preferable shape to prevent the stack from shifting.

In addition, with the compression volume reduction treatment method of the present invention, the volume reduction rate can be reduced to 1/4 to 1/5 compared to the conventional method of filling and storing waste in cylindrical containers such as drums. Compared to storing compressed bodies with a circular cross section, storage efficiency can be improved by 20 to 25%.

(Effects of the Invention) As is clear from the detailed explanation above, according to the solid waste compression and volume reduction treatment method of the present invention, each cylindrical container filled with waste is preferably rectangular or hexagonal. Since it is configured to crush and store it again in a storage container having a square or hexagonal cross-sectional shape, an extremely large volume reduction rate can be achieved and storage space can be used efficiently.

[Brief explanation of drawings]

Figures 1 a to e are diagrams showing one embodiment of the compression volume reduction treatment method of the present invention in the order of steps, and Figures 2 a to e are diagrams showing other embodiments of the compression volume reduction treatment method of the present invention. FIG. 3 is a diagram showing one embodiment of a high-pressure press used in the present invention. 1... Cylindrical container, 2, 4... Compressed body, 3, 5
... storage container, 11 ... large diameter section, 12 ... small diameter section, 13 ... taper section, 14 ... press ram,
15... Projection, 16... Compression sleeve, 17...
High pressure press machine.

Claims (1)

[Claims] 1. A cylindrical container filled with solid waste, whose inner circumferential surface consists of a cylindrical large diameter part at the top, a square or hexagonal small diameter part at the bottom, and a tapered part in the middle, and is installed at the periphery of the press ram. A high-pressure press having a compression sleeve provided with a large number of longitudinal grooves that engage with the ridges is used to compress the material into a crushed product having a square or hexagonal shape. 1. A method for compressing and reducing the volume of solid waste, which is characterized by containing crushed material and storing it in a hermetically sealed manner.