分級, 比重選別, 表面研磨等による重金属汚染土壌浄化実用技術の一例

概要

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The states of contaminated soil vary widely; therefore, the techniques applicable to the soil concerned and appropriate equipment should be selected and used with care. The authors developed a contamination diagnosis method involving an investigation into types of contamination and contaminated states of different grain-size fractions, as well as a highly efficient method of remediating heavy metal-contaminated soil using grain sorting, gravity separation, and grainsurface attrition according to the properties of the soil. We conducted soil remediation using contamination diagnosis and highly efficient remediation methods for both on-site and fixed-site (off-site) cleaning cases, and achieved cleaning efficiencies exceeding 80% in both cases (more than 80% of contaminated soil was cleaned). The cleaned soil obtained in the on-site case was reused as backfill at the site. The cleaned soil in the fixed-site case (off-site case) was effectively recycled as a raw material for fine aggregate.
2007-12-25