CEA: Corporate Environmental Advisors: Remediation: SVE

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Soil Vapor Extraction/Air Sparging

Soil vapor extraction is a frequently used innovative treatment technology. It extracts contaminants from soil in vapor form and provides an oxygen source which stimulates bioremediation of some contaminants.

Air sparging is the injection of contaminant free air into the subsurface saturated zone, enabling a phase transfer of hydrocarbons and CVOC's from a dissolved state to a vapor phase form. Air sparging works in conjunction with Soil Vapor Extraction (SVE) systems. When combined with SVE, the SVE system creates a negative pressure in the unsaturated zone through a series of extraction wells to control vapor migration. Subsurface formations suitable for SVE include zones with coarse-grained soil like sand and gravel.

The advantage of air sparging is it extends the effectiveness of soil vapor extraction to include contaminants that exist in ground water. Air sparging can also accelerate cleanup at pump and treat, and SVE sites. It can be implemented with a minimal disturbance to site operations and requires no removal, treatment, storage, or discharge considerations for groundwater. It also provides an oxygen source to stimulate bioremediation.