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In-situ groundwater remediation by selective colloid mobilization

United States Patent

5,846,434
December 8, 1998
View the Complete Patent at the US Patent & Trademark Office
Savannah River National Laboratory - Visit the Technology Transfer Website
An in-situ groundwater remediation pump and treat technique effective for reclamation of aquifers that have been contaminated with a mixed, metal-containing waste, which promotes selective mobilization of metal oxide colloids with a cationic surfactant, preferably a quaternary alkylammonium surfactant, without significantly reducing formation permeability that often accompanies large-scale colloid dispersion, thus increasing the efficiency of the remediation effort by enhancing the capture of strongly sorbing contaminants associated with the oxide phases. The resulting suspension can be separated from the bulk solution with controlled pH adjustments to destabilize the oxide colloids, and a clear supernatant which results that can be recycled through the injection well without further waste treatment.
Seaman; John C. (New Ellenton, SC), Bertch; Paul M. (Aiken, SC)
University of Georgia Research Foundation (Athens, GA)
08/ 808,253
February 28, 1997
STATEMENT OF GOVERNMENT INTEREST This invention was made with government support under Grant No. DE-AC0976SR00-819 granted by the Department of Energy. The government has certain rights in this invention.