Record Display for the EPA National Library CatalogRECORD NUMBER: 10 OF 10
|Main Title||Sequential Anaerobic Degradation of 2,4-Dichlorophenol in Freshwater Sediments.|
|Author||Zhang, X. ; Wiegel, J. ;|
|CORP Author||Georgia Univ., Athens.;Environmental Research Lab., Athens, GA. Office of Research and Development.;Department of Energy, Washington, DC.|
|Report Number||DE-FG09-86ER-13614, EPA-R-812638; EPA/600/J-94/294;|
|Additional Subjects||Anaerobic bacteria ; Chlorohydrocarbons ; Water pollution ; Biodegradation ; Freshwater ; Sediments ; Aquatic bacteria ; Phenols ; Halohydrocarbons ; Dehalogenation ; Reprints ; 2-4-DCP(2-4-Dichlorophenol) ; Phenols/2-4-Dichloro|
2,4-Dichlorophenol (2,4-DCP) was degraded anaerobically in freshwater lake sediments. From observed intermediates in incubated sediment samples and from enrichment cultures, the following sequence of transformations was postulated. 2,4-DCP is dechlorinated to 4-chlorophenol (4-CP), 4-CP is dechlorinated to phenol, phenol is carboxylated to benzoate, and benzoate is degraded via acetate to methane and carbon carbon dioxide. At least five different organisms are involved sequentially. The rate-limiting step was the transformation of 4-CP to phenol. Sediment-free enrichment cultures were obtained that catalyzed only the dechlorination of 2,4-DCP, the carboxylation of phenols, and the degradation of benzoate, respectively.