PMID: 11345446May 10, 2001Paper

Kinetics of polychlorinated biphenyl dechlorination and growth of dechlorinating microorganisms

Environmental Toxicology and Chemistry
G Y RheeT Erkkila

Abstract

The present study has investigated a correlation between the kinetics of polychlorinated biphenyl (PCB) dechlorination and the growth of dechlorinating microbial populations. Microorganisms were eluted from Aroclor 1248-contaminated St. Lawrence River (NY, USA) sediments and inoculated into clean sediments spiked with Aroclor 1248 at 10 concentrations ranging from 0 to 3.12 micromol/g sediment (0-900 ppm). The time course of PCB dechlorination and population growth were concurrently determined by congener-specific analysis and the most probable number technique, respectively. The specific growth rate was a saturation function of PCB concentrations above the threshold concentration (0.14 micromol/g sediment, or 40 ppm), below which no dechlorination or growth of dechlorinations were observed. The maximum growth rate was 0.20/d with a half-saturation constant of 1.23 micromol/g sediment. The yield of dechlorinating microorganisms showed a peak at 0.70 micromol/g sediment (200 ppm), with a value of 10.3 x 10(12) cells/mol Cl removed, and decreased below and above this concentration. The dechlorination rate (micromol Cl removed/g sediment/d) was a linear function of Aroclor concentration. Both the log of this rate and the maximum l...Continue Reading

Citations

Nov 24, 2007·Environmental Pollution·Jim A Field, Reyes Sierra-Alvarez
Oct 1, 2002·FEMS Microbiology Ecology·Young-Cheol ChoG-Yull Rhee
Apr 16, 2002·Environmental Toxicology and Chemistry·Young-Cheol ChoG-Yull Rhee

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