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Oxygen transfer limitation in a respirometer

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The oxygen uptake process in a respirometer was analyzed by a mathematical model consisting of oxygen transfer accompanied with oxygen consumption reaction. The criterion to avoid an oxygen-transfer limitation was derived on the basis of the ratio of the maximum biochemical reaction rate to the maximum possible oxygen-transfer rate. The maximum biochemical reaction is described by the first-order rate equation, whereas the maximum possible oxygen-transfer rate is calculated by multiplying the oxygen-transfer coefficient with the solubility of oxygen in water. An oxygen-transfer coefficient in a respirometric reactor was estimated as 1.8 h−1, by using the model analysis of an oxygen uptake data from the same reactor. A simplified criterion for a respirometer without oxygen-transfer limitation is then obtained as XS ≪ 16.51/K1 where X and S represent concentration of biomass and substrate, respectively, and K1 is the first-order rate constant, (L/mg VSS)/h.
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Keywords: MODEL; OXYGEN TRANSFER; RESPIROMETER

Document Type: Research Article

Publication date: 1996-01-01

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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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