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Biodegradation of cis-Dichloroethene and Vinyl Chloride in the Capillary Fringe
Date
2014-11-18
Author
Kurt, Zöhre
Spain, Jim C.
Metadata
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This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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Volatile chlorinated compounds are major pollutants in groundwater, and they pose a risk of vapor intrusion into buildings. Vapor intrusion can be prevented by natural attenuation in the vadose zone if biodegradation mechanisms can be established. In this study, we tested the hypothesis that bacteria can use cis-dichloroethene (cis-DCE) or vinyl chloride (VC) as an electron donor in the vadose zone. Anoxic water containing cis-DCE or VC was pumped continuously beneath laboratory columns that represented the vadose zone. Columns were inoculated with Polaromonas sp. strain JS666, which grows aerobically on cis-DCE, or with Mycobacterium sp. JS60 and Nocardiodes sp. JS614 that grow on VC. Complete biodegradation with fluxes of 84 +/- 15 mu mol of cis-DCE.m(-2).hr(-1) and 218 +/- 25 mu mole VC.m(-2).h(-1) within the 23 cm column indicated that microbial activities can prevent the migration of cis-DCE and VC vapors. Oxygen and volatile compound profiles along with enumeration of bacterial populations indicated that most of the biodegradation took place in the first 10 cm above the saturated zone within the capillary fringe. The results revealed that cis-DCE and VC can be biodegraded readily at the oxic/anoxic interfaces in the vadose zone if appropriate microbes are present.
Subject Keywords
Ethene
,
Degradation
,
Vapor intrusion
,
Contaminated sites
,
Microbial mineralization
,
Vadose zone
,
Aerobic biodegradation
,
Real-time pcr
,
Oxygen-limited biodegradation;
,
sp strain js666
URI
https://hdl.handle.net/11511/42298
Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
DOI
https://doi.org/10.1021/es503071m
Collections
Department of Environmental Engineering, Article
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Z. Kurt and J. C. Spain, “Biodegradation of cis-Dichloroethene and Vinyl Chloride in the Capillary Fringe,”
ENVIRONMENTAL SCIENCE & TECHNOLOGY
, pp. 13350–13357, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/42298.