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Appl. Environ. Microbiol., Apr 1995, 1546-1550, Vol 61, No. 4
MM Haggblom and LY Young
Sulfidogenic consortia enriched from an estuarine sediment were maintained
on either 2-, 3-, or 4-chlorophenol as the only source of carbon and energy
for over 5 years. The enrichment culture on 4- chlorophenol was the most
active and this consortium was selected for further characterization.
Utilization of chlorophenol resulted in sulfate depletion corresponding to
the values expected for complete mineralization to CO2. Degradation of
4-chlorophenol was coupled to sulfate reduction, since substrate
utilization was dependent on sulfidogenesis and chlorophenol loss did not
proceed in the absence of sulfate. Other sulfur oxyanions, sulfite or
thiosulfate, also served as electron acceptors for chlorophenol
utilization, while carbonate, nitrate, and fumarate did not. The
sulfidogenic consortium utilized phenol, 4-bromophenol, and 4-iodophenol in
addition to 4-chlorophenol. 4-Fluorophenol, however, did not serve as a
substrate. 4-Bromo- and 4- iodophenol were degraded with stoichiometric
release of halide, and 4- [14C]bromophenol was mineralized, with 90% of the
radiolabel recovered as CO2.
Copyright © 1995, American Society for Microbiology
Anaerobic degradation of halogenated phenols by sulfate-reducing consortia
Center for Agricultural Molecular Biology, Cook College, Rutgers, State University of New Jersey, New Brunswick 08903, USA.
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