||Extrapolation of Biodegradation Results to Groundwater Aquifers: Reductive Dehalogenation of Aromatic Compounds.
Gibson, S. A. ;
Suflita, J. M. ;
||Oklahoma Univ., Norman. Dept. of Botany and Microbiology.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Ground water ;
Water pollution ;
Chlorine organic compounds ;
Microorganism control(Water) ;
Aromatic compounds ;
Aquatic microbiology ;
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The reductive biodegradation of a variety of haloaromatic substrates was monitored in samples from two sites within a shallow anoxic aquifer and was compared with freshwater sediment and sewage sludge. The metabolic capacity existing in methane-producing aquifer material was very similar to that in sediment in that three to four chlorobenzoates, five of seven chlorophenols, and one of two chlorophenoxyacetate herbicides were reductively dehalogenated in both types of incubations. Biological removal of the sulfate in samples from this site permitted dehalogenation of a model substrate, while stimualtion of methanogenesis without removal of sulfate did not. These results demonstrate that dehalogenating microorganisms were present at this site but that their activity was at least partially inhibited by the high sulfate levels. (Copyright (c) 1986, American Society for Microbiology.)