Oxygen Transfer in a Loop Reactor for Viscous Non-Newtonian Biosystems

概要

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The gas-liquid and liquid-solid mass transfer in biosuspensions of low and high viscosity is closely related to the power input, the air flow rate, the geometry of the reactor and the stirrer, as well as the rheological properties of the medium. Due to this multiple dependency and to interactions that cannot be mathematically described with accuracy, it is not possible to make exact observations of reactions. An overall consideration of the mass flux and determination of its location are therefore necessary. The result of this can be a compartmentalized mass transfer model consisting of two parts : The stirrer region as the active reaction volume φV_L(convective transfer)and the bulk as the nonactive reaction volume(1-φ)V_L(mainly diffusive transfer). The proportion of the active mass transfer volume to the nonactive volume was determined in several chemostat experiments with different fluid dynamics. Oxygen transfer studies were performed using cultures of Trichosporon cutaneum, a strictly aerobic yeast. Xanthan gum was used to thicken the culture medium.
社団法人日本生物工学会の論文
1983-10-25