Population dynamics of polychlorinated biphenyl-dechlorinating microorganisms in contaminated sediments.

Applied and Environmental Microbiology
J Kim, G Rhee

Abstract

The growth dynamics of polychlorinated biphenyl (PCB)-dechlorinating microorganisms were determined for the first time, along with those of sulfate reducers and methanogens, by using the most-probable-number technique. The time course of Aroclor 1248 dechlorination mirrored the growth of dechlorinators; dechlorination ensued when the dechlorinating population increased by 2 orders of magnitude from 2.5 x 10(sup5) to 4.6 x 10(sup7) cells g of sediment(sup-1), at a specific growth rate of 6.7 day(sup-1) between 2 and 6 weeks. During this period, PCB-dechlorinating microorganisms dechlorinated Aroclor 1248 at a rate of 3.9 x 10(sup-8) mol of Cl g of sediment(sup-1) day(sup-1), reducing the average number of Cl molecules per biphenyl from 3.9 to 2.8. The growth yield was 4.2 x 10(sup13) cells mol of Cl dechlorinated(sup-1). Once dechlorination reached a plateau, after 6 weeks, the number of dechlorinators began to decrease. On the other hand, dechlorinators inoculated into PCB-free sediments decreased over time from their initial level, suggesting that PCBs are required for their selective enrichment. The numbers of sulfate reducers and methanogens increased in both PCB-free and contaminated sediments, showing little difference bet...Continue Reading

References

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Jun 1, 1995·Applied and Environmental Microbiology·D YeS A Boyd

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Citations

May 14, 2009·Journal of Environmental Monitoring : JEM·Peter Ruiz-Haas, James Ingle
May 7, 2015·Critical Reviews in Toxicology·T B Henry
Oct 1, 2002·FEMS Microbiology Ecology·Young-Cheol ChoG-Yull Rhee
Apr 26, 2000·FEMS Microbiology Ecology·J Wiegel, Q Wu

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