Reductive Dechlorination of Polychlorinated Biphenyls by Anaerobic Microorganisms from Sediments

  title={Reductive Dechlorination of Polychlorinated Biphenyls by Anaerobic Microorganisms from Sediments},
  author={John F. Quensen and James M. Tiedje and Stephen A. Boyd},
  pages={752 - 754}
Microorganisms from Hudson River sediments reductively dechlorinated most polychlorinated biphenyls (PCBs) in Aroclor 1242 under anaerobic conditions, thus demonstrating PCB dechlorination by anaerobic bacteria in the laboratory. The most rapid dechlorination was observed at the highest PCB concentration used; at 700 parts per million Aroclor, 53 percent of the total chlorine was removed in 16 weeks, and the proportion of mono- and dichlorobiphenyls increased from 9 to 88 percent… 

Anaerobic dechlorination of aroclor 1242 as affected by some environmental conditions

The effect of electron acceptors and biphenyl on reductive dechlorination was investigated using the commercial polychlorinated biphenyl mixture Aroclor 1242 and sediment microorganisms from the

Dechlorination of Fenclor 54 and of a synthetic mixture of polychlorinated biphenyls by anaerobic microorganisms

The low product yield deriving from reductive dechlorination of PCBs, and the slow rate of PCB biotransformation can be attributed to a lower dehalogenation capability of artificially contaminated soil microorganisms and, perhaps, also to the inadequacy of the adopted anaerobic medium.

Microbial reductive dechlorination of PCBs

It is now reasonable to field test reductive dechlorination of PCBs in cases where the PCB concentration is in the range where regulatory standards may be directly achieved by de chlorination, where a subsequent aerobic treatment is feasible, where any co-contaminants do not pose an inhibitory problem, and where anaerobic conditions can be established.

Microbial reductive dehalogenation of polychlorinated biphenyls.

  • WiegelWu
  • Environmental Science
    FEMS microbiology ecology
  • 2000
Temperature, pH, availability of naturally occurring or of supplemented carbon sources, and the presence or absence of H(2) or other electron donors and competing electron acceptors influence the de chlorination rate, extent and route of PCB dechlorination.

Reductive dechlorination of PCB-contaminated raisin river sediments by anaerobic microbial granules.

This study is the first demonstration of enhanced reductive dechlorination of sediment PCBs by an exogenous anaerobic microbial consortium.

Altered biologic activities of commercial polychlorinated biphenyl mixtures after microbial reductive dechlorination.

The data presented here establish that the biologic activities of commercial PCB mixtures are altered by microbial reductive dechlorination and that an assessment of their toxic potential requires an array of tests that include the different mechanisms associated with PCBs.



Polychlorinated Biphenyl Dechlorination in Aquatic Sediments

The polychlorinated biphenyl (PCB) residues in the aquatic sediments from six PCB spill sites showed changes in PCB isomer and homolog (congener) distribution that indicated the occurrence of

Environmental dechlorination of PCBs

The polychlorinated biphenyls (PCBs) in sediment and/or fish samples from at least five different locations show changes in gas chromatographic (GC) peak distribution indicative of reductive

Extensive degradation of Aroclors and environmentally transformed polychlorinated biphenyls by Alcaligenes eutrophus H850

A strain of Alcaligenes eurtrophus, designated H850, is isolated and characterized that rapidly degrades a broad and unusual spectrum of polychlorinated biphenyls (PCBs) including many tetra- and pentachlorobipenyls and several hexachlorOBiphenylS.

General method for determining anaerobic biodegradation potential

A revised anaerobic salts medium was developed which minimizes problems of a biological gas production (CO2), avoids precipitation, and meets the requirements of theAnaerobic microbiota.

Evidence for novel mechanisms of polychlorinated biphenyl metabolism in Alcaligenes eutrophus H850

The atypical congener selectivity pattern and novel metabolites produced suggest that A. eutrophus H850 may degrade certain PCB congeners by a new route beginning with attack by some enzyme other than the usual 2,3-dioxygenase.

Effect of chlorine substitution on the bacterial metabolism of various polychlorinated biphenyls

Two major metabolites of a chlorobenzoic acid and an unknown compound accumulated always in the metabolism of this group of polychlorinated biphenyls, which are all chlorinated at the 2,4'-position in the molecules in common.

High-resolution PCB analysis: synthesis and chromatographic properties of all 209 PCB congeners.

With some additional analytical improvements, isomer-specific PCB analysis can be utilized to determine the composition of commercial PCBs and accurately follow the fate and distribution of these pollutants within the global ecosystem.

Halogenated biphenyls: molecular toxicology.

This group of PCBs exhibits many of the properties of 2,3,7,8-TCDD and related polychlorinated dibenzo-p-dioxins; there is a close parallel in the relative potencies of these PCBs for AHH induction and their binding affinities for the Ah receptor protein and some ofThese PCBs are also toxic.

Effects of sorption on biological degradation rates of (2,4-dichlorophenoxy) acetic acid in soils

Three mathematical models proposed to describe the effects of sorption of both bacteria and the herbicide (2,4-dichlorophenoxy)acetic acid on the biological degradation rates of 2, 4-D in soils indicated that sorbed 2,3-D is completely protected from degradation and that both sorbed and solution bacteria are capable of degrading 2,4,D in solution.