Classification washing treatment of radioactive cesium-contaminated soil

Soil washing treatment was conducted for remediation of radioactive cesium-contaminated soil. According to the soil washing test results, radioactive cesium in soil exists mainly in fine soil particles. Therefore separating the fine-grained fraction from soils reduces the radioactive cesium concentration of soils. The coarse-grained fraction can be handled by some post-processing treatments. Radioactive cesium in the coarse-grained fraction was efficiently reduced by surface attrition using a shaker and hydrochloric acid immersion. Similarly, some pre-processing treatments using a shaker and mill for the soil, which included the fine-grained fraction, could reduce the concentration of radioactive cesium. The coagulation-sedimentation method using a flocculant was shown to be effective for muddy water treatment. (author)