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- W2977649160 abstract "The objective of this study was to evaluate possiblebioremediation strategy for aerobic aquifers by combining ZVIchemical reduction and microbial reductive dechlorination for TCEand ClO4-. To achieve this objective, continuous flow-through soilcolumns were used to test the hypothesis that bioaugmentation withdechlorinating enrichment cultures downstream of the ZVI injectioncan lead to complete reduction of TCE and ClO4- in aerobicaquifers. We obtained soil and groundwater from a Superfund site inArizona. The experiments consisted of 205 cm3 columns packed withsoil and ZVI, which fed 1025 cm3 columns packed with soil,biostimulated with fermentable substrates and bioaugmented. Aerobicgroundwater was pumped through the ZVI columns. The ZVI reduced theoxidation-reduction potential (ORP) of groundwater from +150 mV to-190 mV. The reduced groundwater and biostimulation withfermentable substrates created anaerobic conditions in thebioaugmentation columns favorable for anaerobic microbial activity.Perchlorate (ClO4-) reduction to non-detectable levels occurredafter biostimulation. Reduction of TCE to cis-dichloroethene, vinylchloride and ethene was observed only after bioaugmentation. Within~120 days of continuous columns operation, ethene was produced inthe bioaugmentation columns this dechlorination activity wassustained until the end of experiments. The groundwater from theSuperfund site had high concentration of sulfate (~1000 mg/L).Substantial sulfate reduction occurred in the bioaugmentationcolumns. Complete microbial reduction of TCE and perchlorate isusually challenging in the presence of high sulfate concentration;however, the strategy tested in this study suggests that abioremediation scheme for simultaneous reduction of TCE andperchlorate in aerobic aquifers containing high sulfateconcentration is feasible." @default.
- W2977649160 created "2019-10-10" @default.
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- W2977649160 date "2019-01-01" @default.
- W2977649160 modified "2023-09-25" @default.
- W2977649160 title "Concurrent reduction of trichloroethylene and perchlorate in continuous flow-through soil columns" @default.
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