Electrokinetic demonstration at Sandia National Laboratories: Use of transference numbers for site characterization and process evaluation

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Electrokinetic remediation is generally an in situ method using direct current electric potentials to move ionic contaminants and/or water to collection electrodes. The method has been extensively studied for application in saturated clayey soils. Over the past few years, an electrokinetic extraction method specific for sandy, unsaturated soils has been developed and patented by Sandia National Laboratories. A RCRA RD&D permitted demonstration of this technology for the in situ removal of chromate contamination from unsaturated soils in a former chromic acid disposal pit was operated during the summer and fall of 1996. This large scale field test represents the first ... continued below

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9 p.

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Lindgren, E.R. & Mattson, E.D. March 1, 1997.

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  • Lindgren, E.R. Sandia National Labs, Environmental Restoration Technologies, Albuquerque, NM (United States)
  • Mattson, E.D. SAT-UNSAT, Inc., Albuquerque, NM (United States)

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Electrokinetic remediation is generally an in situ method using direct current electric potentials to move ionic contaminants and/or water to collection electrodes. The method has been extensively studied for application in saturated clayey soils. Over the past few years, an electrokinetic extraction method specific for sandy, unsaturated soils has been developed and patented by Sandia National Laboratories. A RCRA RD&D permitted demonstration of this technology for the in situ removal of chromate contamination from unsaturated soils in a former chromic acid disposal pit was operated during the summer and fall of 1996. This large scale field test represents the first use of electrokinetics for the removal of heavy metal contamination from unsaturated soils in the United States and is part of the US EPA Superfund Innovative Technology Evaluation (SITE) Program. Guidelines for characterizing a site for electrokinetic remediation are lacking, especially for applications in unsaturated soil. The transference number of an ion is the fraction of the current carried by that ion in an electric field and represents the best measure of contaminant removal efficiency in most electrokinetic remediation processes. In this paper we compare the transference number of chromate initially present in the contaminated unsaturated soil, with the transference number in the electrokinetic process effluent to demonstrate the utility of evaluating this parameter.

Physical Description

9 p.

Notes

INIS; OSTI as DE97003005

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  • Waste Management `97, Tucson, AZ (United States), 2-7 Mar 1997

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  • Other: DE97003005
  • Report No.: SAND--97-0281C
  • Report No.: CONF-970335--14
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 459804
  • Archival Resource Key: ark:/67531/metadc675667

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • March 1, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • June 13, 2016, 7:22 p.m.

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Lindgren, E.R. & Mattson, E.D. Electrokinetic demonstration at Sandia National Laboratories: Use of transference numbers for site characterization and process evaluation, article, March 1, 1997; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc675667/: accessed October 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.