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ENHANCED SOURCE REMOVAL USING IN-SITU CHEMICAL FLUSHING
Citation:
Wood*, A L. ENHANCED SOURCE REMOVAL USING IN-SITU CHEMICAL FLUSHING. Presented at Intl. Environmental Tech. Expo '99, Atlantic City, NJ, 04/20-21/1999.
Description:
Dense non-aqueous phase liquids (DNAPL) have been identified as a major impediment to the cleanup of many contaminated sites. Conventional ground water remediation methods such as pump-and-treat have proven ineffective at these sites. As a result, alternative remediation approaches such as in-situ chemical flushing are under development and evaluation, in-situ chemical flushing is a technique whereby fluids containing chemical adjuvants are pumped through contaminated soils or aquifers in an attempt to facilitate contaminant removal through enhanced dissolution or mobilization. To be successful, this approach requires good mixing between the resident contaminants and injected remedial fluids, as well as, control and recovery of solubilized or mobilized contaminants and remedial agents. In addition, recovery and reuse of adjuvants will likely be necessary in order to minimize the cost of implementation of the technology. Surfactants and cosolvents are adjuvants which have shown promise in laboratory and small field demonstrations. Larger scale field demonstrations are needed to assess the technical and economic applicability this technology for source zone remediation.