Mixing and oxygen transfer in conventional stirred fermentors.
A set of experiments has been performed in an industrial 112 m(3) fermentor in order to get a complete map of oxygen concentration and temperature distribution in the system. Five fermentations of non-Newtonian broths of two different strains, in various operating conditions, were examined. A simple model has been developed which takes into account both the mixing and the mass-transfer properties of the fermentor, and a dimensionless parameter has been identified which is sufficient to characterize the oxygen axial distribution in the reactor in any operating condition.
Farmitalia, C. Erba S.p.A., Prod., Bios. Bioingegneria, Settimo Torinese, Italy.
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Manfredini
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Cavallera
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Marini
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Donati