| Popis: |
By the standard soil washing methods, only the coarse grained soils can be washed and reused. Contaminants adsorbed to the soil surface cannot be removed in the fine-grained soils. A new washing technology was proposed that utilizes a washing solution containing an ion exchange substance and freeze-thaw phenomena for ion exchange on the surface of soil particles. In this study, potassium was used as an alternative substance of a radioactive cesium and an ammonium acetate solution was used as washing solution of an ion exchange substance. The purpose of this study is to clarify the effect of washing condition on the remediation. One-dimensional freeze thaw tests were performed using samples mixed with water or ammonium acetate solution. In the experimental results, the concentration of potassium in the thaw drainage was greater ammonium acetate solution mixing sample than water mixing one. Therefore, the washing efficiency of the tests using a specimen mixed with ammonium acetate solution was greater than that mixed with water. It was indicated that potassium is desorbed before freezing because of the specimen mixed with ammonium acetate solution. |
