Biotransformation of chlorinated aliphatic solvents in the presence of aromatic compounds under methanogenic conditions
- Stanford Univ., CA (United States). Dept. of Civil Engineering
Transformation of carbon tetrachloride (CT) and tetrachloroethylene (PCE) was studied under methanogenic conditions, in the presence or absence of toluene, ethylbenzene, phenol, and benzoate. Microbial inoculate for the experiments were derived from three groundwater aquifers contaminated by jet fuel or creosote. CT and PCE were reductively dechlorinated in all the examined castes (CT to chloroform [CF]; PCE to trichloroethylene [TCE], trans-1,2-dichloroethylene [DCE], and vinyl chloride [VC]). In the aquifer microcosms, the electron donors used for the reductive transformations were most likely the unidentified organic compounds present on aquifer solids, or storage materials in microorganisms. Alternatively, molecular hydrogen from the anaerobic incubator atmosphere could have been used. The addition of benzoate caused a decrease in rates of dechlorination if benzoate was transformed. Phenol and ethylbenzene were not degraded and did not influence the transformation of CT or PCE. Toluene, in most of the studied cases, had no influence on reductive dechlorination of either CT or PCE. Only in microcosms derived from a JP-4 jet fuel-contaminated aquifer did the anaerobic degradation of toluene occur simultaneously with reductive dechlorination of PCE, suggesting that toluene might possibly have been used as an electron donor for reductive transformation of chlorinated solvents.
- OSTI ID:
- 7078037
- Journal Information:
- Environmental Toxicology and Chemistry; (United States), Journal Name: Environmental Toxicology and Chemistry; (United States) Vol. 12:8; ISSN ETOCDK; ISSN 0730-7268
- Country of Publication:
- United States
- Language:
- English
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020900* -- Petroleum-- Environmental Aspects
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63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ALKYLATED AROMATICS
AQUIFERS
AROMATICS
BENZENE
BENZOIC ACID
BIODEGRADATION
CARBON TETRACHLORIDE
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CHLORINATED ALIPHATIC HYDROCARBONS
CREOSOTE
DECOMPOSITION
ENVIRONMENTAL EFFECTS
FUELS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
HYDROXY COMPOUNDS
JET ENGINE FUELS
LIQUID FUELS
METABOLISM
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHENOL
PHENOLS
POLLUTION
TOLUENE
WATER POLLUTION