Evaluation of in situ air sparging for MTBE removal from a gasoline source

Illa L. Amerson, Richard L. Johnson

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Abstract

A study was performed to determine how much MTBE could be removed from a gasoline source by volatilization and to evaluate the overall impact of the in situ air sparging (IAS) system on downgradient concentrations after treatment. Gasoline was released at the water table at 1 m below ground surface. Over a 12-hr period, ~ 200 L of gasoline were introduced. A dissolved plume was established by flowing water through tank for several days. Soil vapor extraction offgas levels were monitored by a GC/FID, which automatically sampled a portion of the offgas stream. MTBE had the highest concentration in the offgas, but the magnitudes of mass removal of MTBE, isooctane, toluene, and o-xylene, were in the same order as the constituents' levels in the original gasoline. High levels of MTBE in the offgas and corresponding high mass removal resulted in removing relatively low percentages of the contaminant from the source zone. With a proper density of IAS wells, effective source zone treatment can be achieved using IAS. However, recontamination of the aquifer is possible if residual gasoline containing MTBE is not removed.

Original languageEnglish (US)
Pages (from-to)247-250
Number of pages4
JournalACS Division of Environmental Chemistry, Preprints
Volume40
Issue number1
StatePublished - Mar 26 2000
Event219th ACS National Meeting - San Francisco, CA, United States
Duration: Mar 26 2000Mar 30 2000

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ASJC Scopus subject areas

  • Chemical Engineering(all)

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