Role of cometabolism in reductive dehalogenation of aromatics
- C.C. Johnson and Malhotra, Detroit, MI (United States)
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Civil and Environmental Engineering
Anaerobic reactions are sequential, so that the effective transformation of chemicals is brought about by the combined action of several different groups of bacteria. Reductive dehalogenation reactions are the first step in the anaerobic degradation of toxic halogenated pollutants, but these reactions alone do not provide the carbon necessary for bacterial growth. Complete removal of the halogen atoms from the aromatic ring is required for these compounds to support growth under anaerobic conditions. The study described in this paper addresses the reductive dehalogenation of several polychlorinated phenols under anaerobic conditions. The tests provided clear evidence of the existence of cometabolic reactions in which the enzymes responsible for the dehalogenation reactions were developed during prior growth on organic cosubstrates. The cometabolic sequential dehalogenation reactions were modeled using a comprehensive toxicity model which takes into account the presence of parent compounds, intermediates, and final products.
- OSTI ID:
- 400694
- Report Number(s):
- CONF-941124--; ISBN 0-935470-85-9
- Country of Publication:
- United States
- Language:
- English
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