Effect of coplanar PCB concentration on dechlorinating microbial communities and dechlorination in estuarine sediments.

  title={Effect of coplanar PCB concentration on dechlorinating microbial communities and dechlorination in estuarine sediments.},
  author={Chuan Hsin Ho and Shiu-Mei Liu},
  volume={82 1},
The effect of concentration of coplanar PCB on the dechlorinating microbial community and dechlorination were investigated in anoxic estuarine sediment collected from Er-Jen River and enriched with 10 and 50 mg L⁻¹ of 3,4,4',5-tetrachlorobiphenyl, 3,3',4,4',5-pentachlorobiphenyl, and 3,3',4,4',5,5'-hexachlorobipheny. Dechlorination rates were similar in the cultures enriched with 10 and 50 mg L⁻¹ of 3,4,4',5-tetrachlorobiphenyl, whereas significantly higher dechlorination rates were observed in… 
A Chloroflexi bacterium dechlorinates polychlorinated biphenyls in marine sediments under in situ-like biogeochemical conditions.
It is suggested that a single dechlorinator is responsible for the observed extensive de chlorination of Aroclor 1254 and that a Chloroflexi species similar to those already detected in freshwater and estuarine contaminated sediments mediates PCB dechlorination in the marine sediment adopted in this study under biogeochemical conditions resembling those occurring in situ in the Brentella Canal of Venice Lagoon.
Changes in selected dioxin-like PCB concentration and toxicity in anaerobically stabilized sewage sludge
AbstractThe process of methane digestion was conducted in two parallel cultures with different sewage sludge. The digestion was conducted three times: the thermophilic one (37°C) for 14 d, the
Bioremediation of PCB-contaminated marine sediments:From identification of indigenous dehalorespirers to enhancement of microbial reductive dechlorination
Marine sediments are the main accumulation reservoir of organic recalcitrant pollutants such as polychlorinated biphenyls (PCBs). In the anoxic conditions typical of these sediments, anaerobic
Identification of two organohalide-respiring Dehalococcoidia associated to different dechlorination activities in PCB-impacted marine sediments
These findings confirm the presence of different PCB-respiring microorganisms in the indigenous microbial communities of Venice Lagoon sediments and relate two non-Dehalococcoides phylotypes of the class DehalococCOidia to different PCB dechlorination rates and specificities.
Microbial dehalogenation of organohalides in marine and estuarine environments.
The activity of dehalogenating microbes may contribute, if properly stimulated, to the in situ bioremediation of marine and estuarine contaminated sediments.
In situ treatment of PCBs by anaerobic microbial dechlorination in aquatic sediment: are we there yet?
  • K. Sowers, H. May
  • Environmental Science, Medicine
    Current opinion in biotechnology
  • 2013
Lab research over the past 25 years is now leading to new microbial technologies that could soon be tested for treatment of PCB impacted sediments in the field, and these could include anaerobic dechlorination of highly chlorinated congeners.
Potential Impacts of PCBs on Sediment Microbiomes in a Tropical Marine Environment
Within the tropical marine study site of Guanica Bay, Puerto Rico, polychlorinated biphenyls (PCBs) are subjected to coastal and oceanic currents coupled with marine microbial and geochemical
Ecotoxicology of polychlorinated biphenyls in fish—a critical review
  • T. Henry
  • Biology, Medicine
    Critical reviews in toxicology
  • 2015
Overall, there appears to be little evidence that PCBs have had any widespread effect on the health or survival of wild fish.


Biodegradation of coplanar polychlorinated biphenyls by anaerobic microorganisms from estuarine sediments.
During 2 years' incubation under sulfidogenic conditions, biphenyl was persistent, while all other chlorinated congeners, except for 345-345 CB, were dechlorinated with or without a lag period in sediment slurries collected from both rivers.
Microbial Reductive Dechlorination of Weathered and Exogenous Co-planar Polychlorinated Biphenyls (PCBs) in an Anaerobic Sediment of Venice Lagoon
The occurrence of reductive dechlorination processes towards pre-existing PCBs and five exogenous coplanar PCBs were investigated in a contaminated sediment of Porto Marghera suspended in water collected from the same site under strictly anaerobic conditions.
Microbial Reductive Dechlorination of Aroclor 1260 in Anaerobic Slurries of Estuarine Sediments
  • Qingzhong Wu, K. Sowers, H. May
  • Medicine, Chemistry
    Applied and Environmental Microbiology
  • 1998
The first confirmed report of microbial ortho dechlorination of a commercial polychlorinated biphenyl mixture was investigated in anaerobic slurries of estuarine sediments from Baltimore Harbor, indicating that the addition of a single congener stimulated the dechlorinated Aroclor 1260.
Anaerobic ortho Dechlorination of Polychlorinated Biphenyls by Estuarine Sediments from Baltimore Harbor
The results indicate that unique anaerobic dechlorinating activity is catalyzed by microorganisms in the estuarine sediments from Baltimore Harbor, and this activity was reproducible and could be sustained through sequential transfers.
Microbial dechlorination of three PCB congeners in river sediment.
The reductive dechlorination of 2,3,4,5-tetrachlorobiphenyl in three different sediment cultures: evidence for the involvement of phylogenetically similar Dehalococcoides-like bacterial populations.
Results provide evidence that Dehalococcoides-like populations were involved in the removal of doubly flanked chlorines from 2,3,4,5-CB, and the successful enrichment of these populations from geographically distant and geochemically distinct environments indicates the widespread presence of these PCB-dechlorinating, Dehal bacteria.
Dehalococcoides ethenogenes strain 195 reductively dechlorinates diverse chlorinated aromatic pollutants.
D. ethenogenes strain 195 has the ability to dechlorinate many different types of chlorinated aromatic compounds, in addition to its known chloroethene respiratory electron acceptors.