This document is available in the Adobe Acrobat PDF Format. Hazardous materials are separated from soils as concentrates, which are then disposed or recycled. Treated soil can be returned to the site. The soil is slurried at 100 o C and the resulting vapors are condensed.
Water is recycled through the system after the soluble organics are removed.
In the metal extraction step, the soil slurry is washed with hydrochloric acid. Subsequent countercurrent washing with water removes residual acid from the soil. The solids are then separated from the final wash solution by gravimetric sedimentation. This process can be applied to soils and sludges contaminated with organics, inorganics, and heavy metals. Three pilot-scale tests have been completed on three soils, for a total of nine tests.