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COLUMN VAPOR EXTRACTION EXPERIMENTS ON GASOLINE CONTAMINATED SOIL
Citation:
Miller, M., T. Pederson, C. Kaslick, AND C. Fan. COLUMN VAPOR EXTRACTION EXPERIMENTS ON GASOLINE CONTAMINATED SOIL. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-92/254.
Description:
Soil vapor extraction (SVE) is a technique that is used to remove volatile organic compounds from unsaturated soils. ir is pumped from the contaminated area and the chemicals are removed from the resulting vapor stream. n this work laboratory, soil column experiments were conducted using a gasoline residually saturated sandy soil to evaluate the performance of SVE under controlled conditions. oth vapor extraction and aqueous leaching of the soil columns were conducted. he progress of the vapor extraction event was continuously monitored by an in-line total hydrocarbon analyzer. erformance of vapor extraction was evaluated by a series of soil chemical analyses including total petroleum hydrocarbons, headspace measurements, and extraction techniques with quantification by GC/FID and GC/MS. ontaminant levels in aqueous percolate were compared before and after SVE. fter 60 pore volumes of water flow through a column, the percolate from the contaminated soil still contained at least 100 ppm of total hydrocarbons by 99.9% while subsequent aqueous leaching resulted in percolate concentrations of 3.7 ppm initially and 0.6 ppm after 60 pore volumes of water flow. his work was conducted under the sponsorship of USEPA RREL. he data is currently undergoing EPA review and no endorsement is implied.