Aerobic biodegradation of vinyl chloride by a highly enriched mixed culture

Biodegradation
Harvinder SinghBabu Z Fathepure

Abstract

Lower chlorinated compounds such as cis-dichloroethene (cis-DCE) and vinyl chloride (VC) often accumulate in chloroethene-contaminated aquifers due to incomplete reductive dechlorination of higher chlorinated compounds. A highly enriched aerobic culture that degrades VC as a growth substrate was obtained from a chloroethene-contaminated aquifer material. The culture rapidly degraded 50-250 microM aqueous VC to below GC detection limit with a first-order rate constant of 0.2 day(-1). Besides VC, the culture also degraded ethene as the sole carbon source. In addition, the culture degraded cis-DCE, but only in the presence of VC. However, no degradation of trans-DCE or TCE occurred either in the presence or absence of VC. The ability of the TRW culture to degrade cis-DCE is significant for natural attenuation since both VC and cis-DCE are often found in chloroethene-contaminated groundwater. Experiments examining the effect of oxygen threshold on VC degradation showed that the culture was able to metabolize VC efficiently at extremely low concentrations of dissolved oxygen (DO). Complete removal of 150 micromoles of VC occurred in the presence of only 0.2 mmol of oxygen (1.8 mg/L DO). This is important since most groundwater envir...Continue Reading

Citations

Apr 28, 2006·Applied Microbiology and Biotechnology·Vijai K ElangoBabu Z Fathepure
May 12, 2009·Journal of Contaminant Hydrology·Gregory B DavisColin D Johnston
Apr 4, 2006·Journal of Contaminant Hydrology·Nandita B BasuK Hatfield
Jan 4, 2018·Applied Microbiology and Biotechnology·Anne E TaylorLewis Semprini
Sep 1, 2012·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·S H Esmaeili FarajH Zilouei
Apr 6, 2017·Environmental Science and Pollution Research International·Iva DolinováAlena Ševců

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