| 摘要 |
PROBLEM TO BE SOLVED: To provide a decontamination method of soil, which allows the volume of contaminated soil to be reduced with improved decontamination efficiency, by finely peeling the surface of coarse soil particles to make fine soil particles to which radioactive substances are adsorbed and then by removing the fine soil particles such that no radioactive substances remain in the coarse soil particles.SOLUTION: Calcium oxide and/or calcium hydroxide, and water are added to the soil contaminated with radioactive substances, agitated and mixed to form a processed product in slurry form. The processed soil in the processed product is separated based on a predetermined particle diameter Da, so that the soil having particle diameter Da or smaller is extracted as contaminated soil and the soil having particle larger than diameter Da is extracted as decontaminated soil. The separation of the processed soil in the processed product is gradually performed on an as needed basis. The processed soil produced in the separation step is repeatedly agitated, mixed, and separated. The processed product is drained in the separation step on an as needed basis. |
