Relative contributions of Dehalobacter and zerovalent iron in the degradation of chlorinated methanes

Environmental Science & Technology
Matthew LeeMike Manefield

Abstract

The role of bacteria and zerovalent iron (Fe(0)) in the degradation of chlorinated solvents in subsurface environments is of interest to researchers and remediation practitioners alike. Fe(0) used in reactive iron barriers for groundwater remediation positively interacted with enrichment cultures containing Dehalobacter strains in the transformation of halogenated methanes. Chloroform transformation and dichloromethane formation was up to 8-fold faster and 14 times higher, respectively, when a Dehalobacter-containing enrichment culture was combined with Fe(0) compared with Fe(0) alone. The dichloromethane-fermenting culture transformed dichloromethane up to three times faster with Fe(0) compared to without. Compound-specific isotope analysis was employed to compare abiotic and biotic chloroform and dichloromethane degradation. The isotope enrichment factor for the abiotic chloroform/Fe(0) reaction was large at -29.4 ± 2.1‰, while that for chloroform respiration by Dehalobacter was minimal at -4.3 ± 0.45‰. The combined abiotic/biotic dechlorination was -8.3 ± 0.7‰, confirming the predominance of biotic dechlorination. The enrichment factor for dichloromethane fermentation was -15.5 ± 1.5‰; however, in the presence of Fe(0) the f...Continue Reading

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Citations

Feb 18, 2020·Rapid Communications in Mass Spectrometry : RCM·Xifen ZhuPing'an Peng
Jul 29, 2017·Genome Announcements·Françoise BringelStéphane Vuilleumier
Jan 7, 2021·Environmental Science and Pollution Research International·Parisa Ebrahimbabaie, John Pichtel

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