In-Pile Thermal Desorption for Treatment of Dioxin-Contaminated Soil in Japan

摘要

A demonstration of thermal treatment of dioxin-contaminated soil was completed in Japan, under the sponsorship of the Japan Ministry of the Environment. TerraTherm’s proprietary In-Pile Thermal Desorption process was demonstrated to successfully treat the soil to the required standard of 1,000 picograms of 2,3,7,8tetrachlorodibenzodioxin (TCDD) toxic equivalents (TEQ) per gram (i.e., pg-TEQ/g), over a 28-day operation period, where the soil was heated to a minimum temperature of 325oC and exposed to vacuum extraction. Off-gases were treated using thermal oxidation and activated carbon adsorption, meeting the Japanese air emission standards. A detailed environmental impact assessment was completed, with favorable outcome for the thermal process.