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Title Chlorophenol degradation coupled to sulfate reduction
Creator/Author Haeggblom, M.M. ; Young, L.Y. (New York University Medical Center, NY (USA))
Publication Date1990 Nov 01
OSTI IdentifierOSTI ID: 5950279
Other Number(s)ISSN0099-2240; CODEN: AEMID
Resource TypeJournal Article
Resource RelationApplied and Environmental Microbiology ; Vol/Issue: 56:11
Subject540310 -- Environment, Aquatic-- Basic Studies-- (1990-); CHLORINATED AROMATIC HYDROCARBONS-- BIODEGRADATION;SULFATES-- REDUCTION; ESTUARIES;PHENOLS;SEDIMENTS
Related SubjectAROMATICS;CHEMICAL REACTIONS;DECOMPOSITION;HALOGENATED AROMATIC HYDROCARBONS;HYDROXY COMPOUNDS;ORGANIC CHLORINE COMPOUNDS;ORGANIC COMPOUNDS;ORGANIC HALOGEN COMPOUNDS;OXYGEN COMPOUNDS;SULFUR COMPOUNDS;SURFACE WATERS
Description/Abstract We studied chlorophenol degradation under sulfate-reducing conditions with an estuarine sediment inoculum.^These cultures degraded 0.1 mM 2-, 3-, and 4-chlorophenol and 2,4-dichlorophenol within 120 to 220 days, but after refeeding with chlorophenols degradation took place in 40 days or less.^Further refeeding greatly enhanced the rate of degradation.^Sulfate consumption by the cultures corresponded to the stoichiometric values expected for complete oxidation of the chlorophenol to CO{sub 2}.^Formation of sulfide from sulfate was confirmed with a radiotracer technique.^No methane was formed, verifying that sulfate reduction was the electron sink.^Addition of molybdate, a specific inhibitor of sulfate reduction, inhibited chlorophenol degradation completely.^These results indicate that the chlorophenols were mineralized under sulfidogenic conditions and that substrate oxidation was coupled to sulfate reduction.^In acclimated cultures the three monochlorophenol isomers and 2,4-dichlorophenol were degraded at rates of 8 to 37 {mu}mol liter{sup {minus}1} day{sup {minus}1}.^The relative rates of degradation were 4-chlorophenol > 3-chlorophenol > 2-chlorophenol, 2,4-dichlorophenol.^Sulfidogenic cultures initiated with biomass from an anaerobic bioreactor used in treatment of pulp-bleaching effluents dechlorinated 2,4-dichlorophenol to 4-chlorophenol, which persisted, whereas 2,6-dichlorophenol was sequentially dechlorinated first to 2-chlorophenol and then to phenol.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 3255-3260
System Entry Date2001 May 13

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