Soil Vapor Extraction (SVE)

Soil vapor extraction (SVE) is an in-situ remediation technology for physical treatment of volatile and some semi-volatile contaminants in the vadose zone (unsaturated soils) (EPA, 2012). SVE is also referred to as in-situ soil venting or vacuum extraction. It is based on a mass transfer of contaminants from the solid and liquid phases into the gas phase. Vacuum blowers and extraction wells are used to induce gas flow through the subsurface. This gas phase contamination is collected at extraction wells then treated in aboveground systems tailored for the volume and constituent of concern.

Sub Slab Depressurization Systems (SSDS) are used to apply vacuum to piping underneath slab in order to remove and/or prevent the migration of chlorinated solvent or petroleum contaminated vapors. Recovered contaminated vapors are treated and then discharged.Sub Slab Depressurization Systems (SSDS) are used to apply vacuum to piping underneath slab in order to remove and/or prevent the migration of chlorinated solvent or petroleum contaminated vapors. Recovered contaminated vapors are treated and then discharged. 

Air Sparging also known as in-situ air stripping and in-situ volatilization is an in-situ remediation technology used for the treatment of saturated soil zones and groundwater contaminated with volatile organic compounds (VOCs). This technique involves injection of pressurized air into the contaminated groundwater enabling the hydrocarbons to change its state from dissolved to vapor state. The injection of air helps to flush the contaminants upward into the unsaturated zone where a vapor extraction system is typically implemented to remove the volatilized contaminants. This technology has beneficial side effects like adding dissolved oxygen to the contaminated ground water and un-saturated zone soils. This enhances biodegradation of contaminants below and above the water table.

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