| 摘要 |
PROBLEM TO BE SOLVED: To efficiently recover and remove contaminants in a hardly gas permeable-water permeable layer essentially consisting of clay or silt having low water permeability and gas permeability. SOLUTION: In this method for treating the contaminated soil, at first, a well 3 for treatment is piercingly installed in a hardly gas permeable-water permeable layer 2 in contaminated soil 1 which is a hardly water permeable layer and also a hardly gas permeable layer (step 101). After the well 3 for treatment is piercingly installed in the hardly gas permeable-water permeable layer 2, a refrigerant is injected into the well 3 for treatment (step 102). Next, gap water within a treatment region is frozen with the refrigerant, so as to form a dome-shaped rigidity-increased region 21, and then, the treatment region 18 is fused (step 103). Next, water passing or gas passing is performed to the inside of the treatment region 18, so as to recover the contaminants via the well 3 for treatment, or the injection of a chemical is performed via the well 3 for treatment, so as to make the contaminants harmless (step 104). COPYRIGHT: (C)2006,JPO&NCIPI
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