Complete dechlorination of tetrachloroethene to ethene in presence of methanogenesis and acetogenesis by an anaerobic sediment microcosm |
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Authors: | Aulenta Federico Majone Mauro Verbo Paolo Tandoi Valter |
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Affiliation: | (1) Department of Chemistry, University of Rome ``La Sapienza', P.le Aldo Moro 5, 00185 Rome, Italy;(2) Water Research Institute, National Research Council (IRSA-CNR), Via Reno 1, 00198 Rome, Italy |
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Abstract: | An anaerobic consortium taken from brackish sediments, enriched byPCE/CH3OH sequential feeding, was capable of completely dechlorinating tetrachloroethene(PCE) to ethene (ETH). In batch experiments, PCE (0.5 mM) was dechlorinated to ethene (ETH) in approximately 75 h with either CH3OH or H2 as the electron donor. When VC (0.5 mM) was added instead of PCE it was dechlorinated without any initial lag by the PCE/CH3OHenriched consortium, although at a lower dechlorination rate. In batch tests H2 could readilyreplace CH3OH for supporting PCE dechlorination, with a similar PCE dechlorination rate andproduct distribution with respect to those observed with methanol. This indicates that H2 productionduring CH3OH fermentation was not the rate-limiting step of PCE or VC dechlorination.Acetogenesis was the predominant activity when methanol was present. A remarkable homoacetogenicactivity was also observed when hydrogen was supplied instead of methanol. |
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Keywords: | ethene homoacetogenesis reductive dechlorination sediment microcosm tetrachloroethene vinyl chloride |
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