| 摘要 |
PROBLEM TO BE SOLVED: To provide a cleaning method for contaminated soil where artificial zeolite powder maintaining required performance is dispersed and mixed into water so as to be a cleaning liquid, the liquid is penetrated and diffused into gaps between contaminated soil, and the contaminated soil can easily be purified at a low cost. SOLUTION: This cleaning method for contaminated soil comprises: the survey of the soil of a land to be cleaned; an excavation stage of excavating cleaning liquid injection holes at uniform intervals and a required hole size and a depth on the whole face of the contaminated soil by a boring machine; and a cleaning liquid injection stage where a cleaning liquid is penetrated and diffused into the gaps between the contaminated soil through the insides of the cleaning liquid injection holes under a required injection pressure by using an injection tube. The cleaning method further comprises a backfilling stage where the soil is subjected to backfilling by using the cleaning liquid consisting of the artificial zeolite powder mixed in the weight ratio of 10 to 35% to water, and having a particle diameter of≤30μm and a specific surface area of≥100 m<SP>2</SP>/g, and whose volume (meq/100g) expressed in terms of a base is≥200 mg, and cleaning packed sand blended with 10 to 35 wt.% artificial zeolite powder based on the excavated and discharged sand through the cleaning liquid injection holes. COPYRIGHT: (C)2005,JPO&NCIPI
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