Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Experimental Examination of Integrated Soil Vapor Extraction Techniques.
Author Johnson, R. L. ; Bagby, W. ; Perrott, M. ; Chen, C. T. ;
CORP Author Oregon Graduate Inst. of Science and Technology, Beaverton. Dept. of Environmental Science and Engineering.;Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab.
Publisher c1992
Year Published 1992
Report Number EPA-R-816947; EPA/600/J-92/280;
Stock Number PB93-131738
Additional Subjects Oil spills ; Land pollution control ; Water pollution control ; Hydrocarbons ; Ground water ; Organic compounds ; Injection ; Water table ; Performance evaluation ; Air flow ; Petroleum products ; Dewatering ; Experimental design ; Sand aquifers ; Aeration ; Remedial action ; Reprints ; Soil vapor extraction ; Air sparging
Library Call Number Additional Info Location Last
NTIS  PB93-131738 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/12/1993
Collation 15p
Soil vapor extraction (SVE) has been shown to be effective at removing hydrocarbons from the unsaturated zone. However, at many spill sites significant fractions of the mass are at or below the water table, in which case SVE is far less effective. To improve its efficiency in cases where gasoline is trapped below the water table, SVE can be used in conjunction with other techniques to get at that trapped mass. In the last few years the direct injection of air into the formation below the water table (i.e., in situ sparging) has become a popular technique. Another approach is to lower the water table to improve air flow in the vicinity of the trapped product. This can be accomplished either in the localized area of a groundwater drawndown cone or as the result of larger scale dewatering. In experiments conducted at the Oregon Graduate Institute (OGI), hydrocarbon spills into a large three-dimentional physical model filled with sand are being used to study the efficiencies of SVE combined with other techniques. Experiments to date have examined SVE operating as a stand-alone technique, as well as in conjunction with air sparging below the water table, dewatering of the 'smear zone' (i.e., where product is trapped as residual below the water table), and air injection into the dewatered smear zone.