Remediation of Nonaqueous Phase Liquid Polluted Sites Using Surfactant-Enhanced Air Sparging and Soil Vapor Extraction

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Abstract:

A two-dimensional laboratory sand tank was installed to study the remediation efficiency of surfactant-enhanced air sparging(SEAS) coupled with soil vapor extraction (SVE) in nonaqueous phase liquid(NAPL) polluted sites. During initial stages of remediation, it was more reasonable to use conventional air sparging coupled with SVE. When most free NAPLs were removed and contaminant removal rate was maintained at a relatively low level, surfactant was added to the groundwater. During enhanced remediation, lower interfacial tension caused residual NAPLs in the porous media to slightly migrate, making the downstream contaminant concentration somewhat higher. The polluted area, however, was not more enlarged than before. The decrease in surface tension resulted in increased air saturation in the groundwater and the extent of the air influence zone. After 310 hours, 78.7% of the initial chlorobenzene mass had volatilized, 3.3% had migrated out of the sand profile, 17.5% was in the vadose zone, and 0.5% remained in the groundwater, thus revealing that SEAS/SVE can effectively improve the remediation of NAPL polluted sites.

Keywords: Surfactant-enhanced air sparging; groundwater remediation; nonaqueous phase liquids; soil vapor extraction

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143012X13560205144173

Affiliations: 1:  Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130026, P. R. China. 2:  College of Environmental Science and Engineering, Tongji University, Shanghai 200092, P. R. China.

Publication date: February 1, 2013

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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