Changes of the main hydrodynamical and parameters during. in a pilot plant external-loop were investigated. the final average concentrations of biomass and citric acid obtained in experimental fermentations were 10.5g/l and 96.6 g/l, respectively. Significant influence of the increasing biomass concentration on the apparent viscosity of the broth, gas holdup, liquid velocity and volumetric oxygen transfer coeficient was found.
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