Anaerobic biodegradation of nitrogen-substituted and sulfonated benzene aquifer contaminants
A literature survey of ground water contaminants indicated that aquifers are repositories for hazardous wastes, including N- and S-substituted benzene derivatives. The susceptibility of several anilines, benzamides, benzenesulfonic acids and benzenesulfonamides to anaerobic metabolism by aquifer microorganisms was examined. Under sulfate-reducing and methanogenic conditions the carboxylated anilines were biotransformed within 1 to 3 months while unsubstituted or methylated anilines required longer incubation times. Benzamide as well as an aryl methyl and an N-methyl derivative were biodegraded under both redox conditions. The anerobic degradation of the N-methylated benzamide was favored in sulfate-reducing rather than methanogenic incubations. However, the addition of a second N-alkyl group rendered the resulting compounds resistant to anaerobic decay. Only 1 of 7 benzenesulfonates and 2 of 5 benzene-sulfonamides proved amenable to anaerobic metabolism. The authors found 37-75% of the theoretically expected amount of methane from aquifer slurries amended with the aminobenzoic acids, benzamide, and p-toluamide. In the sulfate-reducing aquifer slurries 89-100% of the oxidized benzamide, p-toluamide and N-methylbenzamide could be accounted for by sulfate reduction. These results help indicate which hazardous waste constituents will likely persist in anoxic aquifers and the types of chemical substitution patterns that favor anaerobic biotransformation.
- Research Organization:
- Oklahoma Univ., Norman, OK (USA). Dept. of Botany and Microbiology
- OSTI ID:
- 7244725
- Report Number(s):
- PB-90-140708/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
560300 -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANAEROBIC CONDITIONS
AQUIFERS
AROMATICS
BACTERIA
BENZENE
BIODEGRADATION
CHEMICAL REACTIONS
CONTAMINATION
CONTROL
DECOMPOSITION
GROUND WATER
HAZARDOUS MATERIALS
HYDROCARBONS
HYDROGEN COMPOUNDS
MATERIALS
MICROORGANISMS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
POLLUTION CONTROL
SULFATE-REDUCING BACTERIA
WATER
WATER POLLUTION CONTROL