216 還元加熱+金属Na分散体法を用いたPOPs等汚染土壌の浄化処理および浄化済土壌の緑化材への適用(安定化・無害化及び循環型廃棄物処理技術,資源循環・廃棄物処理技術)

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  • 216 POPs contaminated soil treatment with Reductive heating and Sodium dispersion method and its recycling for material of green planting

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Reductive heating and Sodium dispersion method is a combined process of reductive heating for reduction of POPs (Persistent Organic Pollutants: Such as PCB, Dioxins, and Organic Chlorinate Agricultural Chemicals) from contaminated soil, and sodium dispersion for the decomposition of POPs material. We investigated the applicability of this process for three characteristic soils at Okinawa region. BHC (Benzene Hexachloride) is reduced from 10mg/kg to lower than 0.001mg/kg in each soil and PCB is also reduced from 53mg/kg to lower than 0.5μg/kg by reductive heating. Dioxins in discharged gas shows lower than 0.1ng-TEQ/m^3N. From the result of green planting test with treated soil, the growth rate of plant is same as that of normal soil, and it is also confirmed that treated soil is able to be recycled for green planting.

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