JPH0551120B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a storage facility for storing waste.

[Problem that the invention seeks to solve]

Overseas, land disposal, along with ocean dumping, was used as a treatment method for radioactive waste and other waste containing hazardous substances. One way to dispose of waste on land is to store it in a pit surrounded by a concrete wall to prevent contamination. However, this method requires a long storage period, so groundwater or rainwater may seep into the pit, or the container holding the waste may break, causing hazardous substances to dissolve in the water and migrate into the surrounding ground or underground water. It is necessary to take measures in advance to prevent accidents from occurring.

This invention has been made in view of the above-mentioned problems. The purpose is to propose a waste storage facility that can prevent accidents in which hazardous substances leak and contaminate the surrounding ground and groundwater.

[Means to solve the problem]

This waste storage facility consists of a continuous underground wall surrounding the pit where waste is stored.
This underground continuous wall is characterized in that at least a portion thereof is constructed with a water-permeable adsorbent wall unit.

〔Example〕

This will be explained below with reference to the illustrated embodiments.

In FIG. 1, low-level radioactive waste 4 filled in a drum container is stored in a rectangular parallelepiped pit 3 constructed on a bedrock 1 and having a concrete structure 2 on its upper and lower four circumferences. This facility has a rectangular surrounding area, and a continuous wall 6 is formed by building a water-permeable adsorbent wall unit 5 into the ground at a predetermined depth. The adsorbent wall unit 5 contains an adsorbent having the ability to adsorb radioactive substances and is water permeable, and is built in a detachable unit to form a continuous wall 6. In the figure, 7 is soil covering, and 8 is a partition wall that partitions the inside of the pit 3.

In the storage facility of the embodiment shown in FIG. 2, a water-stop continuous wall 9 is provided underground at a predetermined depth surrounding a rectangular parallelepiped pit 3 in a rectangular manner. Water-permeable adsorbent wall units 5 are removably built in two corners of one side.

The adsorbent used in this invention is a water-permeable material containing an adsorbent capable of adsorbing radioactive substances, such as ion exchange resin and zeolite. For example, it is a porous molded product obtained by fixing and molding a mixture of cationic ion exchange resin pellets and fillers such as sand and lightweight aggregate using a relatively small amount of a binder such as an unsaturated polyester resin. Of course, small pieces or powder such as the above-mentioned adsorbent pellets may be directly packed into a porous bag or the like to serve as an adsorbent. These adsorbents are used as molded bodies or attached to or packed in a water-permeable frame to form a plate-shaped adsorbent wall unit.

[Effect]

This invention consists of the above configuration. This facility has a continuous underground wall around the pit where the waste is stored, and this wall is either entirely composed of a water-permeable adsorbent wall unit, or it is adsorbed to a part of the water-tight wall. Since the wall unit is built-in, even if harmful substances dissolve in water and leach from the pit, they will be adsorbed in the process of permeating through the adsorbent layer of the wall unit, preventing contamination of the surrounding ground and underground water by leachate. .

The adsorbent is made into a plate-shaped wall unit, and this is built in to form a continuous wall, so the wall unit can be installed and removed as a unit, and the adsorbent can be reactivated, improving the adsorbent's function. Maintenance and management become easier.

Further, if the adsorbent layer is provided only on the downstream side of the groundwater as in the embodiment shown in FIG. 2, the adsorbent layer to be managed is narrowed, so that a high adsorption function can be provided at low cost.

〔Effect of the invention〕

This invention is as described above, and this facility can prevent contamination of the ground and underground water due to leaching of harmful substances.

[Brief explanation of drawings]

The drawings show the storage facility of the example, and FIGS. 1a and 1b are a cross-sectional view and an A-A vertical cross-sectional view of the facility in which an adsorbent wall unit is built around the pit and a continuous wall is provided, Figures 2a and 2b are a cross-sectional view and an A-A vertical cross-sectional view of a facility in which a continuous wall of adsorbent wall units is provided only on the downstream side of the underground water around the pit. 1...Bedrock, 2...Concrete construction, 3...Pit, 4...Low level radioactive waste, 5...Adsorbent wall unit, 6...Continuous wall, 7...Soil covering, 8...
...Partition wall, 9...Water stop continuous wall.

Claims (1)

[Claims] 1. A waste product characterized in that a continuous underground wall is provided surrounding a pit for storing waste, and the continuous underground wall is constructed with a water-permeable adsorbent wall unit built into at least a portion thereof. storage facility.