Soilvapor Extraction

This treatment technology removes volatile compounds from the vadose zone. Airflow is injected through extraction wells creating a vacuum and a pressure gradient that induces volatiles to diffuse through the extraction wells. The volatiles are collected as gases and treated above-ground. The technology is effective for halogenated volatiles and fuel hydrocarbons (U.S. EPA 1991a). The technology is also cost effective when large volumes of soil are involved; since treatment takes place onsite, the risks and costs associated with transporting large volumes of contaminated soils are eliminated.

The technology, however, is less effective in soils with low air permeability, low temperatures, or high carbon content. In addition, although this technology reduces the volume of the contaminants, the toxicity of the contaminants is not reduced.

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