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• W2912483202 abstract "Widespread use of chlorinated solvents for commercialand industrial purposes makes co-occurring contamination by1,1,1-trichloroethane (TCA), trichloroethene (TCE), and 1,4-dioxane(1,4-D) a serious problem for groundwater. TCE and TCA often aretreated by reductive dechlorination, while 1,4-D resists reductivetreatment. Aerobic bacteria are able to oxidize 1,4-D, but thebiological oxidation of 1,4-D could be inhibited TCA, TCE, andtheir reductive transformation products. To overcome the challengesfrom co-occurring contamination, I propose a two-stage synergisticsystem. First, anaerobic reduction of the chlorinated hydrocarbonstakes place in a H2-based hollow-fiber “X-film” (biofilm orcatalyst-coated film) reactor (MXfR), where “X-film” can be a“bio-film” (MBfR) or an abiotic “palladium-film” (MPfR). Then,aerobic removal of 1,4-D and other organic compounds takes place inan O2-based MBfR. For the reductive part, I tested reductivebio-dechlorination of TCA and TCE simultaneously in an MBfR. Ifound that the community of anaerobic bacteria can rapidly reduceTCE to cis-dichloroethene (cis-DCE), but further reductions ofcis-DCE to vinyl chloride (VC) and VC to ethene were inhibited byTCA. Also, it took months to grow a strong biofilm that couldreduce TCA and TCE. Another problem with reductive dechlorinationin the MBfR is that mono-chloroethane (MCA) was not reduced toethane. In contrast, a film of palladium nano-particles (PdNPs),i.e., an MPfR, could the simultaneous reductions of TCA and TCE tomainly ethane, with only small amounts of intermediates:1,1-dichloroethane (DCA) (~3% of total influent TCA and TCE) andMCA (~1%) in continuous operation. For aerobic oxidation, Ienriched an ethanotrophic culture that could oxidize 1,4-D withethane as the primary electron donor. An O2-based MBfR, inoculatedwith the enriched ethanotrophic culture, achieved over 99% 1,4-Dremoval with ethane as the primary electron donor in continuousoperation. Finally, I evaluated two-stage treatment with a H2-basedMPfR followed by an O2-MBfR. The two-stage system gave completeremoval of TCA, TCE, and 1,4-D in continuousoperation." @default.
• W2912483202 created "2019-02-21" @default.
• W2912483202 creator A5024076164 @default.
• W2912483202 date "2018-01-01" @default.
• W2912483202 modified "2023-09-27" @default.
• W2912483202 title "Synergistic Reductive Dechlorination of 1,1,1‐Trichloroethane and Trichloroethene and Aerobic Degradation of 1,4‐Dioxane" @default.
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