||Microbial Degradation of Nitrogen, Oxygen and Sulfur Heterocyclic Compounds under Anaerobic Conditions: Studies with Aquifer Samples.
Kuhn, E. P. ;
Suflita, J. M. ;
||Oklahoma Univ., Norman. Dept. of Botany and Microbiology.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Anaerobic processes ;
Hazardous materials ;
Water pollution ;
Heterocyclic compounds ;
Ground water ;
Industrial wastes ;
Waste disposal ;
Sulfur heterocyclic compounds ;
Nitrogen heterocyclic compounds ;
Oxygen heterocyclic compounds ;
Sulfate reducing bacteria ;
Environmental transport ;
Environmental effects ;
Methane bacteria ;
Land pollution ;
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The potential for anaerobic biodegradation of 12 heterocyclic model compounds was studied. Nine of the model compounds were biotransformed in aquifer slurries under sulfate-reducing or methanogenic conditions. The nitrogen and oxygen heterocyclic compounds were more susceptible to anaerobic biodegradation than those compounds containing a sulfur deteroatom. In contrast, only small amounts of methane were detected in aquifer slurries amended with compounds containing an oxygen heteroatom, even though a decrease in the parent substrate concentration occurred. Pyridine, 2-picoline and 4-picoline were biotransformed within three months under sulfate-reducing conditions. However, longer incubation times were required for the degradation of these substrates in methanogenic aquifer slurries. A literature survey reveals the widespread contamination of ground waters with heterocyclic compounds from waste management practice and fossil-fuel-related industries.