Effects of sulfuroxy anions on degradation of pentachlorophenol by a methanogenic enrichment culture

We studied the degradation of pentachlorophenol (PCP) under methanogenic and sulfate-reducing conditions with an anaerobic mixed culture derived from sewage sludge. The consortium degraded PCP via 2,3,4,5-tetrachlorophenol, 3,4,5-trichlorophenol, and 3,5-dichlorophenol and eventually accumulated 3-c...

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Bibliographic Details
Published in:Applied and Environmental Microbiology 1991-09, Vol.57 (9), p.2453-2458
Main Authors: Madsen, T, Aamand, J
Format: Article
Language:English
Subjects:
anaerobic bacteria
biodegradation
Biological and medical sciences
dechlorination
Environmental and Public Health Microbiology
Fundamental and applied biological sciences. Psychology
inhibition
methane
methanogenic bacteria
Molecular and cellular biology
Molecular genetics
pentachlorophenol
sewage sludge
sulfates
sulfites
sulfuroxy anions
thiosulfates
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Summary:We studied the degradation of pentachlorophenol (PCP) under methanogenic and sulfate-reducing conditions with an anaerobic mixed culture derived from sewage sludge. The consortium degraded PCP via 2,3,4,5-tetrachlorophenol, 3,4,5-trichlorophenol, and 3,5-dichlorophenol and eventually accumulated 3-chlorophenol. Dechlorination of PCP and metabolites was inhibited in the presence of sulfate, thiosulfate, and sulfite. A decrease in the rate of PCP transformation was noted when the endogenous dissolved H2 was depleted below 0.11 micromole in sulfate-reducing cultures. The effect on dechlorination observed with sulfate could be relieved by addition of molybdate, a competitive inhibitor of sulfate reduction. Addition of H2 reduced the inhibition observed with sulfuroxy anions. The inhibitory effect of sulfuroxy anions may be due to a competition for H2 between sulfate reduction and dechlorination. When cultured under methanogenic conditions, the consortium degraded several chlorinated and brominated phenols.
ISSN:0099-2240
1098-5336
DOI:10.1128/aem.57.9.2453-2458.1991