NDLI: Aerobic biodegradation of vinyl chloride by a highly enriched mixed culture

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Aerobic biodegradation of vinyl chloride by a highly enriched mixed culture

Content Provider	Springer Nature Link
Author	Sing, Harvinder Löffler, Frank E. Fathepure, Babu Z.
Copyright Year	2004
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 μM 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 mu;moles of VC occurred in the presence of only 0.2 mmol of oxygen (1.8 mg/L DO). This is important since most groundwater environments contain low DO (1–2 mg/L). Studies showed that the culture was able to withstand long periods of VC starvation. For example, the culture was able to assimilate VC with minimal lag time even after 5 months of starvation. This is impressive from the point of its sustenance under field conditions. Overall the culture is robust and degrades VC to below the detection limit rendering this culture suitable for field application.
Starting Page	197
Ending Page	204
Page Count	8
File Format	PDF
ISSN	09239820
Journal	Biodegradation
Volume Number	15
Issue Number	3
e-ISSN	15729729
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geochemistry Soil Science & Conservation Terrestrial Pollution Waste Management/Waste Technology Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Environmental Engineering Bioengineering Microbiology

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