Microbial reductive dechlorination of PCBs

  title={Microbial reductive dechlorination of PCBs},
  author={James M. Tiedje and John F. Quensen and Joanne C Chee-Sanford and Joshua P. Schimel and Stephen A. Boyd},
Reductive dechlorination is an advantageous process to microorganisms under anaerobic conditions because it is an electron sink, thereby allowing reoxidation of metabolic intermediates. In some organisms this has been demonstrated to support growth. Many chlorinated compounds have now been shown to be reductively dechlorinated under anaerobic conditions, including many of the congeners in commercial PCB mixtures. Anaerobic microbial communities in sediments dechlorinate Aroclor at rates of 3 µg… 

Reductive dechlorination of weathered Aroclor 1260 during anaerobic biotreatment of Arctic soils.

The potential for bioremediation of aerobic soil contaminated with Aroclor 1260 is demonstrated and it is shown that weathering may limit such treatment to an extent variable among different soils.

Discovery of Organohalide-Respiring Processes and the Bacteria Involved

Hazardous halogenated organic compounds are produced industrially for a variety of uses, are highly resistant to degradation by aerobic organisms, and are now widely distributed throughout the

The role of dehalorespiring bacteria in the reductive dechlorination of polychlorinated biphenyls in Baltimore harbor sediment microcosms

Microorganisms that can dechlorinate Aroclor 1260 have been identified for the first time and dechlorination of congener mixtures was shown to occur by the growthlinked complementary activities of bacterial consortia within the Chloroflexi.

Biodegradation of xenobiotics by anaerobic bacteria

For persistent compounds including polychlorinated biphenyls, dioxins, and DDT, anaerobic processes are slow for remedial application, but can be a significant long-term avenue for natural attenuation.

Bioremediation of PCB-contaminated marine sediments:From identification of indigenous dehalorespirers to enhancement of microbial reductive dechlorination

The best bioremediation approach resulted to be a combination of bioaugmentation and biOREmediation and it could be a starting point to design bioremediatedation process for actual marine sediments of the Venice Lagoon area.

Polychlorinated Biphenyls (PCBs): Environmental Fate, Challenges and Bioremediation

Different types of bacteria and fungi are reported to successfully degrade PCBs, but only a few fungi are possible degraders in the absence of alternative carbon sources.



Reductive Dechlorination of Polychlorinated Biphenyls by Anaerobic Microorganisms from Sediments

Results indicate that reductive dechlorination may be an important environmental fate of PCBs, and suggest that a sequential anaerobic-aerobic biological treatment system for PCBs may be feasible.

Effects of Organic Substrates on Dechlorination of Aroclor 1242 in Anaerobic Sediments

  • L. NiesT. Vogel
  • Environmental Science, Biology
    Applied and environmental microbiology
  • 1990
The effects of different organic substrates on the abilities of anaerobic sediment enrichments to reductively dechlorinate polychlorinated biphenyls (PCBs) were studied and significant dechlorination over time was observed.

Microbial reductive dehalogenation.

A wide variety of compounds can be biodegraded via reductive removal of halogen substituents. This process can degrade toxic pollutants, some of which are not known to be biodegraded by any other

Aerobic and Anaerobic Biodegradation of PCBs: A Review

Current research involving the aerobic biodegradation of PCBs (natural strains, recombinant organisms, and soil applications) and the dramatic new results demonstrating microbial reductive dechlorination of even highly chlorinated PCBs under anaerobic conditions are summarized.

Sequential anaerobic-aerobic biodegradation of PCBs in soil slurry microcosms

The results represent a case in which anaerobic river sediment organisms have been successfully transferred to a matrix free of river or lake sediments.

Growth yield increase linked to reductive dechlorination in a defined 3-chlorobenzoate degrading methanogenic coculture

Observations show that the electrochemical potential between the redox partners of the H+/H2 and 3-chlorobenzoate/benzoate (electron-accepting) couples is a potential source of energy and is consistent with the hypothesis that reductive dechlorination of aromatic compounds is coupled to a novel type of microbial chemotrophy.

Dechlorination of Four Commercial Polychlorinated Biphenyl Mixtures (Aroclors) by Anaerobic Microorganisms from Sediments

There are different PCB-dechlorinating microorganisms at different sites, with characteristic specificities for PCB dechlorination, suggesting that the Hudson River microorganisms were more capable than the Silver Lake organisms of removing the last para chlorine.

Reductive ortho and meta Dechlorination of a Polychlorinated Biphenyl Congener by Anaerobic Microorganisms

This is the first experimental demonstration of ortho dechlorination of a polychlorinated biphenyl by anaerobic microorganisms.

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

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.