Limited degradation of chlorophenols by anaerobic sludge granules

Article Abstract:

The effects of potentially important factors on the rate and extent of degradation of chlorophenols (CPs) by anaerobic sludge granules were examined. The sludge granules were limited in their ability to degrade, via reductive halogenation, the CPs tested and were not capable of mineralization of CPs with meta- or para-chlorine substituents. The initial concentration affected the rate and extent of dechlorination while temperature affected the rate of dechlorination. Addition of electron donors or acceptors also did not increase the extent of degradation.

Environmental aspects, Biodegradation, Sludge

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Reductive dehalogenation of chlorophenol by Desulfomonile tiedjei DCB-1

Article Abstract:

Anaerobically grown pure cultures of Desulfominile tiedjei DCB-1 reductively dehalogenates pentachlorophenols. D. tiedjei was shown to specifically remove chlorine substituents in the meta position. It also completely metabolizes phenols with high chlorine content. This dehalogenation serves as a cell detoxification mechanism and appears to be induced by 3-chlorobenzoate. It requires formate as a reductant and is catalyzed by livingcells.

Analysis, Sulfur bacteria

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Influence of sulfur oxyanions on reductive dehalogenation activities in Desulfomonile tiedjei

Article Abstract:

Microbiological research shows that sulfate, sulfite and thiosulfate inhibits growth in the microorganism Desulfomonile tiedjei via a number of physiological mechanisms, all of which affect the enzyme reductive dehalogenation and involve sulfur oxyanions. Evidence suggests that sulfur oxyanions act as preferred electron acceptors and negatively influence dehalogenation activity via active aryl dehalogenase level control.

Halocarbons, Pollutants, Enzymatic analysis

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