Oxygen transfer limitation in a respirometer
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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Document Type: Research Article
Publication date: 1996-01-01
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