Shimizu Corp., one of Japan’s leading general contractors, developed the construction technology to purify low-concentrated arsenicum in the soil at a cost about one third of the existing construction technology. The new technology mixes upturned contaminated soil with water and a chemical agent, and separates heavy metals adhere to soil grains by melting them. Because it allows about 95% of the soil to be reused, it reduces the cost to dispose of industrial waste. In addition, the construction schedule remains almost unchanged. This technology is to cope with the intensified regulation due to the revised Soil Contamination Countermeasures Act enacted last April. The revised act classifies even the land contaminated with natural heavy metals as a contaminated area. Treatment equipment is installed in the field, and two kinds of agents are used. One is to make heavy metals adhere to the soil grain separate easily, and the other is to unstick the heavy metals. Almost soil treated in the field can be reclaimed. It costs 3,000-5,000 yen per ton to treat 100,000 tons of soil. Currently, about 30% of soil is discarded as industrial waste. Shimizu plans to market this technology to companies and local municipalities that have land in the coastal area.
Shimizu Corp., one of Japan’s leading general contractors, developed the construction technology to purify low-concentrated arsenicum in the soil at a cost about one third of the existing construction technology. The new technology mixes upturned contaminated soil with water and a chemical agent, and separates heavy metals adhere to soil grains by melting them. Because it allows about 95% of the soil to be reused, it reduces the cost to dispose of industrial waste. In addition, the construction schedule remains almost unchanged. This technology is to cope with the intensified regulation due to the revised Soil Contamination Countermeasures Act enacted last April. The revised act classifies even the land contaminated with natural heavy metals as a contaminated area. Treatment equipment is installed in the field, and two kinds of agents are used. One is to make heavy metals adhere to the soil grain separate easily, and the other is to unstick the heavy metals. Almost soil treated in the field can be reclaimed. It costs 3,000-5,000 yen per ton to treat 100,000 tons of soil. Currently, about 30% of soil is discarded as industrial waste. Shimizu plans to market this technology to companies and local municipalities that have land in the coastal area.
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