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Characteristics of PCE Reductive Dechlorination using Benzoate as an Electron Donor  

Lee, Il-Su (School of Environmental and Civil Engineering, Inha University)
Bae, Jae-Ho (School of Environmental and Civil Engineering, Inha University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.28, no.3, 2006 , pp. 292-299 More about this Journal
Abstract
Batch experiments were performed to evaluate the effects of the electron donor dosage and the initial biomass on the reductive dechlorination of perchloroethene(PCE) with benzoate as an electron donor. When benzoate was added less than the theoretical requirement for dechlorination(electron donor/acceptor ratio=0.5 and 1), the dechlorination efficiency increased from 71% to 94.3% with the increase in benzoate dosage, but the fraction of electron equivalent utilized for dechlorination decreased from 92.7% to 79.6%. Methane production was observed when the hydrogen concentration was higher than the threshold value(10 nM) after PCE and trichloroethene (TCE) were reduced to cis-1,2-dichloroethene(cDCE). When benzoate was added more than the theoretical requirement, the residual hydrogen converted into methane after the completion of dechlorination. The increase in the seeding biomass shortened the lag time for dechlorination, but it did not affect the maximum dechlorination rate as it was mainly governed by the benzoate fermentation rate. When the seeding biomass concentration was high, active dechlorination during the early period increased dechlorination efficiency while decreasing methane production.
Keywords
Reductive Dechlorination; Chlorinated Ethenes; Hydrogen; Benzoate; Electron Donor/Acceptor Ratio;
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