Complete remediation of PCE contaminated unsaturated soils by sequential anaerobic-aerobic bioventing.
Bioventing principles have been applied to completely dechlorinate tetrachloroethylene vapors in the unsaturated zone in a sequential anaerobic-aerobic pattern. The aerobic step yields trans-DCE and VC as PCE reductive dechlorination byproducts, while TCE and cis-DCE are observed as intermediates. The aerobic step results in rapid oxidation of the VC and trans-DCE to carbon dioxide. Hydrogen was delivered in the gas phase as a reducing agent for the anaerobic step at levels of 1%, and oxygen at 4.2% was used as an electron acceptor in the aerobic step. PCE and VC half lives in the anaerobic and aerobic steps respectively, where less than 10 min.
Mihopoulos
P G
PG
Department of Civil and Environmental Engineering, University of Cincinnati, Cincinnati, OH 45221-0071.
Suidan
M T
MT
Sayles
G D
GD
D001420:Bacteria, Aerobic; D001673:Biodegradation, Environmental; D017606:Chlorine Compounds / Q000378:metabolism; D004785:Environmental Pollutants / Q000378:metabolism*; D010084:Oxidation-Reduction; D012989:Soil Pollutants / Q000378:metabolism*; D013750:Tetrachloroethylene / Q000378:metabolism*; D014752:Vinyl Chloride / Q000378:metabolism; D014835:Volatilization
D017606:Chlorine Compounds; D004785:Environmental Pollutants; D012989:Soil Pollutants; D013750:Tetrachloroethylene; D014752:Vinyl Chloride