Laboratory Study of Treatment of Trichloroethene by Chemical Oxidation Followed by Bioremediation

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• 作者：Leila Hrapovic ; Brent E. Sleep ; David J. Major ; and Eric D. Hood
• 刊名：Environmental Science & Technology
• 出版年：2005
• 出版时间：April 15, 2005
• 年：2005
• 卷：39
• 期：8
• 页码：2888 - 2897
• 全文大小：224K
• 年卷期：v.39,no.8(April 15, 2005)
• ISSN：1520-5851

文摘

Studies were conducted with columns containing soil andemplaced trichloroethene (TCE) to investigate thepotential for TCE source zone remediation with chemicaloxidation followed by biologically mediated reductivedehalogenation. Following permanganate flushing of fourcolumns, which resulted in rapid but incomplete removal ofTCE DNAPL, no biological activity was observed followingthe addition of distilled water amended with ethanoland acetate, including two of the four columns that werebioaugmented with a TCE-dechlorinating microbialculture. Flushing with unsterilized site groundwater led toconsumption of acetate and ethanol, accompanied bymanganese reduction and methanogenesis. Reductivedechlorination of TCE to cis-1,2-dichloroethene (cis-DCE)followed the onset of ethanol and acetate biodegradation inbioaugmented columns only. Partial dechlorination ofTCE to ethene was observed only in one of the bioaugmentedcolumns after it was inoculated for a third time. At theend of the study (290 days), a trace amount of cis-DCE wasobserved in one of the two columns which was notbioaugmented. Reduced conditions created by biostimulationwere also conducive to reduction of Mn(IV) from MnO₂in both bioaugmented and nonbioaugmented columns resultingin an increased dissolved manganese (Mn²⁺) concentrationin groundwater.