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TETRACHLOROETHENE RELEASE AND DEGRADATION DURING COMBINED ERH AND SODIUM PERSULFATE OXIDATION
Costanza, J., T. Marcet, N.L. Capiro, and K.D. Pennell.
Groundwater Monitoring & Remediation 37(4):43-50(2017)

A study was conducted to determine the extent of PCE degradation during bench-scale thermal treatment of a PCE-contaminated silty clay loam using electrical resistance heating (ERH). The soil was collected from a contaminated area at a former dry cleaning facility. After 30 days of ERH, 52% of the initial PCE mass was recovered, potentially indicating that 48% of the PCE was degraded during ERH. The potential benefit of adding heat-activated sodium persulfate during treatment was evaluated in a second experiment. After 19 days of ERH and three persulfate injections, 93% of the initial PCE was recovered, with 3% PCE destruction based on chloride evolution. The difference in mass recovery between the first and second experiments might have been due to differences in the initial mass of PCE, even though both experiments used soil from the same core. Results suggest that most of the mass recovered during ERH of the PCE-contaminated soil at the former dry cleaning facility can be attributed to volatilization and gas phase extraction rather than abiotic degradation.



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