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Microbial dynamics in a continuously stirred tank reactor with 100% cell recycle

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Effects of continuous cultivation on the dynamics of heterogenous populations were investigated by employing a continuously stirred tank reactor (CSTR) with 100% cell recycle to minimize biomass waste and any shifts in microbial populations. Phenol was used as model substrate and as the sole carbon source. Activated sludge bacteria, acclimated to phenol, were grown in a CSTR with 100% cell recycle operated at the same dilution rate but with different influent phenol concentrations. During the steady state, the kinetic parameters for the Haldane model (µ m , K s , and K 1 ) characterizing growth on phenol were determined by a long-term batch experiment. The dominant microbial species at each steady state were analyzed by biochemical assays. There was a shift in microbial species at different influent phenol concentrations with a corresponding change in µ m values whereas the values of K s and K 1 were not influenced. Even though the changes in microbial populations and kinetic parameters were attributed to changes in the influent phenol concentration, there was no direct correlation between them.

Keywords: biodegradation; continuous culture; growth; kinetics; phenol

Document Type: Research Article


Publication date: September 1, 1992

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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