Establishment of a polychlorinated biphenyl-dechlorinating microbial consortium, specific for doubly flanked chlorines, in a defined, sediment-free medium

Article Abstract:

Researchers describe the establishment of a microbial colony from an estuarine sediment that can de-chlorinate polychlorinated biphenyls (PCBs). It can be grown in sediment-free medium but it only removes para or meta chlorines, not ortho chlorines.

Microbial metabolism, Dechlorination

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Anaerobic ortho dechlorination of polychlorinated biphenyls by estuarine sediments from Baltimore Harbor

Article Abstract:

Microorganisms in the estuarine sediments of Baltimore Harbor exhibit ortho, para and meta dechlorination of polychlorinated biphenyls. The sediments dechlorinate 2,3,5,6-chlorinated biphenyl (CB), 2,3,5-CB and 2,3,6-CB in freshwater enrichment, marine and estuarine media. The dechlorination is initiated rapidly, and is sustainable and reproducible. More than 90% dechlorination is seen in media containing only 2,3,5-CB. No ortho dechlorination is seen in freshwater sediments.

Environmental aspects, Baltimore, Maryland

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Microbial reductive dechlorination of Aroclor 1260 in anaerobic slurries of estuarine sediments

Article Abstract:

Extensive meta dechlorination and moderate ortho dechlorination in all incubated cultures, except for sterilized controls, were noted in the dechlorination of Aroclor 1260 by enrichment cultures prepared with estuarine sediments. Total chlorines per biphenyl decreased by up to 34%, meta chlorines per biphenyl decreased by 65%, 55% and 45% and ortho chlorines declined by 18%, 12% and 9%. It is the first confirmed report of microbial ortho dechlorination of a commercial polychlorinated biphenyl mixture.

Oxidation-reduction reaction, Oxidation-reduction reactions

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