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Main Title Reductive Dechlorination of Dichlorophenols in Anaerobic Pond Sediments (Chapter 13).
Author Hale, D. D. ; Rogers, J. E. ; Wiegel, J. ;
CORP Author Environmental Research Lab., Athens, GA. ;Technology Applications, Inc., Athens, GA. ;Georgia Univ., Athens.
Publisher c1991
Year Published 1991
Report Number EPA/600/D-91/230;
Stock Number PB92-101708
Additional Subjects Dechlorination ; Water pollution sampling ; Sediments ; Microbial degradation ; Anaerobic processes ; Chemical properties ; Physical properties ; Molecular structure ; pH ; Oxidation reduction reactions ; Environmental persistence ; Phenols ; Ecosystems ; Sediment-water interfaces ; Aquatic microorganisms ; Freshwater ; Aromatic compounds ; Biodeterioration ; Reprints ; Phenol/dichloro
Library Call Number Additional Info Location Last
NTIS  PB92-101708 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 14p
The time required for the microbially mediated dechlorination of chloroaromatics in anaerobic freshwater sediments may be dependent upon sediment microbial communities and physical characteristics, as well as chlorine position on the aromatic ring. To better understand such possible relationships, the authors studied the reductive dechlorination of three dichlorophenol isomers in anaerobic sediments collected every other month for a year from five sites in one pond. Numbers of specific dechlorinating microorganisms were estimated by a most proable number technique, and sediment temperature, pH, Eh, and organic carbon content were determined. Levels of dissolved organic carbon, sulfate, and nitrate also were quantified in water samples collected with the anaerobic sediments. The relative susceptibility of the 2,4-, 2,5-, and 3,4- isomers to dechlorination was determined in sediment slurries. Dechlorination to monochlorophenols required from 2 to more than 32 weeks for completion, with the relative rates being 2,4->2,5->3,4-. The number of specific dechlorinating microbes appears to be important in determining the time required for the transformation.