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EFFECTS OF REACTION PARAMETERS ON ELECTROCHEMICAL DECHLORINATION OF TRICHLOROETHYLENE RATE AND BY-PRODUCTS
Citation:
AL-ABED, S. R. AND Y. FANG. EFFECTS OF REACTION PARAMETERS ON ELECTROCHEMICAL DECHLORINATION OF TRICHLOROETHYLENE RATE AND BY-PRODUCTS. Presented at The Fifteenth Annual AEHS Meeting and West Coast Conference on Soils, Sediments and Water, San Diego, CA, March 14 - 17, 2005.
Impact/Purpose:
to present information
Description:
Trichloroethylene (TCE) was electrochemically dechlorinated in aqueous environments using granular graphite cathode in a mixed reactor. Effects of pH, current, electrolyte type, and flow rate on TCE dechlorination rate were evaluated. TCE dechlorination rate constant and gas production were proportional to applied current in both solutions. TCE dechlorination rates were similar at pH7 and pH4 in 0.1 N ammonium acetate solution and both had similar gas production. At pH10 slower dechlorination rate was observed and lower gas production and dechlorination. TCE dechlorination in ammonium acetate under three flow rates exhibited similar overall dechlorination rate constant but different gas production. Lower flow rate resulted in higher gas production. Product distributions as well as current efficiency during TCE dechlorination under various conditions will also be discussed. Our results confirmed the effectiveness of ECD to dechlorinate TCE with the potential of using this technology to remediate contaminants other than TCE such as PAHs, PCBs, fuels, and arsenic in contaminated sediments and groundwater. We will present the strategy of how ECD can be applied in contaminated sediments and soils.