Electrolytic Reactive Barriers for Chlorinated Solvent Remediation
The e-barrier is an emerging technology that applies fundamental electrochemical principles to a permeable reactive barrier (PRB). The e-barrier consists of closely spaced (e.g., 1 centimeter [cm]) permeable electrodes installed in a trench that intercepts a plume of contaminated groundwater (Figure 17.1). Low-voltage direct current (DC) sufficient to drive the degradation reactions of interest is applied to the electrodes. If sufficient electrical potential is applied, oxidizing conditions develop at the anode (positive electrode) and reducing conditions develop at the cathode (negative electrode). Since a complete electrical circuit is present, the dissolved contaminants are subject to sequential oxidation-reduction or reduction-oxidation, depending on the sequence of charges applied to the electrode set. This sequence can be altered depending on the contaminant of interest and the chemistry of the local groundwater. Through sequential oxidation-reduction (or reduction-oxidation), an aqueous phase chlorinated compound is degraded into thermodynamically favored carbon dioxide or methane and chloride.
KeywordsProgrammable Logic Controller Sheet Pile Permeable Reactive Barrier Energetic Compound Field Demonstration
- Ballaban MN. 2003. Electrolytic reactors (e-barrier) for in situ treatment of chlorinated compounds in groundwater: Borden field experiment. MS Thesis, University of Waterloo, Waterloo, Ontario, Canada.Google Scholar
- Gilbert DM, Sale TC, Petersen MA. 2008. Addendum to Final Report: Electrically Induced Redox Barriers for Treatment of Groundwater. Addendum to Environmental Security Technology Certification Program (ESTCP) Project CU-0112 Final Report. ESTCP, Arlington, VA, USA. http://www.estcp.org/viewfile.cfm?Doc=ER%2D0112%2DFR%2DAddendum%2Epdf. Accessed Jun 18, 2009.
- Petersen MA. 2003. Sequential Electrolytic Processes for the Treatment of Trichloroethene in Ground Water. Masters Thesis, Colorado State University, Fort Collins, CO, USA.Google Scholar
- Sale TC, Petersen MA, Gilbert DM. 2005. Electrically Induced Redox Barriers for Treatment of Groundwater. ESTCP CU-0112 Final Report. ESTCP, Arlington, VA, USA. http://www.estcp.org/viewfile.cfm?Doc=cu%2D0112%2Dfr%2D01%2Epdf. Accessed June 18, 2009.
- USEPA (U.S. Environmental Protection Agency). 2002. Economic Analysis of the Implementation of Permeable Reactive Barriers for Remediation of Contaminated Groundwater. EPA/600/R-02/034. USEPA, Washington, DC, USA.Google Scholar