JPH0631882B2 - Waste treatment facility - Google Patents

Description

TECHNICAL FIELD The present invention relates to a treatment facility for waste such as low-level radioactive waste or industrial waste.

[Problems to be solved by the invention]

As a method of treating low-level radioactive waste, land disposal as well as ocean dumping were performed. The usual method of land disposal is called burial in shallow ground, and it was basically to place waste in trenches that open to the surface of the earth, cover it with soil, and then slightly fill it up above the ground surface and close it tightly. However, the waste container is corroded to create a harmful void inside the trench, and the soil is submerged to flood the inside, which stays inside the trench and leach out radioactive materials, and the surrounding soil and There were many cases where groundwater was contaminated and became a problem.

In addition, the facilities for treating general waste such as industrial waste are usually
Although it is piled up in layers on the flat land alternately with mountain soil and buried in valleys and landfills, heavy metals have leached out and mixed with the surrounding soil and groundwater to cause pollution.
Low-level radioactive waste or highly toxic heavy metal waste is usually stored in a closed container and buried in the ground. Even in this case, measures against leakage when the container is damaged are required.

The present invention has been made in view of the above problems. The purpose is to propose a waste treatment facility that can prevent pollution of soil, groundwater, etc. by adsorbing the materials leached from the waste.

[Means and Examples for Solving Problems]

This waste treatment facility stores the waste in a closed container,
In a waste treatment facility buried in the ground, a shielding material made of soil mortar mixed with a zeolite adsorbent is filled around a closed container.

Fig. 1 shows a soil mortar in which the ground 1 is excavated, the waste 3 is embedded in the excavation hole in a drum container that is a closed container, and the adsorbent is mixed in the excavation hole in the surrounding area This is a waste treatment facility in which the shielding material 2 is filled.

In this example, even if the drum container is damaged and the metal in the waste leaks, and this is dissolved in the submerged water, the shielding material 2 mixed with zeolite adsorbs dissolved substances in water as described below. The metal solution or radioactive material does not exist in the aqueous solution that has permeated the two layers of the shielding material having the desired thickness, and the contamination of the surrounding soil and groundwater can be prevented.

Further, even when a void is formed inside due to corrosion of the drum container, depression of the surrounding soil mortar shielding material is unlikely to occur, and expansion of contamination due to flooding from the outside can be prevented.

Below, we made soil mortar mixed with zeolite as an adsorbent and investigated its adsorption characteristics.

The above values are the results obtained by bringing 5 g of each of the mortar I and II of the example, the loam of the comparative example, and sand into contact with 300 ml of the isotope stock solution.

Fig. 2 shows that low-level radioactive waste 3 contained in a drum container is buried in an excavation hole on a rock bed 4 without excavating a ground pit, and adsorbed in the excavation hole around it. This facility is filled with a shielding material 2 made of soil mortar mixed with a chemical agent, covered with waste material 3, and covered with soil 5 at the top. Even if radioactive material leaks and dissolves in flooded water at this treatment facility, the shielding material adsorbs the dissolved material and prevents contamination of surrounding soil and groundwater.

[Advantages of the Invention] The present invention is as described above. In this treatment facility, a shielding material made of soil mortar with excellent adsorption performance is filled around the closed container that contains the waste, so even if radioactive material or harmful metals leak out, contact with the leachate of these materials As a result, harmful substances can be adsorbed and contamination of surrounding soil or groundwater can be prevented.

Since the shielding material made of soil mortar is easily compatible with the surrounding ground and avoids the concentration of stress, it has advantages over concrete materials even during an earthquake, and has the advantages of low material cost and easy construction. Further, since it has sufficient strength to support the closed container, it is unlikely to be depressed even when the closed container is corroded, and it is possible to prevent the spread of contamination due to the infiltration of water from the outside.

[Brief description of drawings]

Fig. 1 is a vertical cross-sectional view of a treatment facility installed in a ground drilling hole filled with shielding material around a closed container containing waste, and Fig. 2 is around a closed container containing low-level radioactive waste. FIG. 3 is a vertical cross-sectional view of a treatment facility provided in a rock drilling hole in which a shielding material is filled. 1 ... Ground, 2 ... Shielding material, 3 ... Waste, 4 ... Bedrock, 5 ... Soil cover.

Claims (1)

[Claims] 1. In a waste treatment facility in which waste is stored in a closed container and buried in the ground, a shielding material made of soil mortar mixed with a zeolite adsorbent is filled around the closed container. Waste treatment facility characterized by the following.