User:Debra Tabron/sandbox

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CONTRIBUTOR(S): Dr. Guilherme Lotufo and Gunther Rosen

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Introduction

Ex Situ (Above Ground) Treatment Technologies for Soil

• Physical Approaches

-Excavation and off-site disposal: Applicable primarily to unsaturated soils. Requires vertical and lateral access to the contaminated material so that excavation is possible. While often required by regulators where gross contamination has been detected, excavating and treating large amounts of soil is expensive.

-Soil washing (Solvent extraction): Involves the blending of an extraction solution (surfactants, leaching/chelating agents or solvents) with the contaminated soil to extract contaminants from the soil. The solution produced by the washing process is separated from the soil and may be recycled if possible. This technology is rarely used due to high costs associated with disposal of the contaminated wash water.