||Anaerobic Biodegradation of Nitrogen-Substituted and Sulfonated Benzene Aquifer Contaminants.
Kuhn, E. P.;
Suflita., J. M.;
||Oklahoma Univ., Norman. Dept. of Botany and Microbiology.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Water pollution control;
Nitrogen organic compounds;
Sulfur organic compounds;
Sulfate reducing bacteria;
Biological industrial waste treatment;
Biologically stable substances
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||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.
||Pub. in Hazardous Waste and Hazardous Materials, v6 n2 p121-133 1989. Sponsored by Robert S. Kerr Environmental Research Lab., Ada, OK.
|NTIS Title Notes
||Reprint: Anaerobic Biodegradation of Nitrogen-Substituted and Sulfonated Benzene Aquifer Contaminants.
||68D; 68C; 57K; 48G
||PC A03/MF A01