The mixing and mass transfer have been investigated in industrial bioreactors of capacity 10,30,50 and 150 m cu.meter. used for citric acid fermentation.Hydrodynamic parameters were examined on water using mineral acid as a trace. Volumetric (kLa) was determined by balance method. It was found that the examined have similar lespite their different capacities. The differences were found in maximum values of kLa which coresponded to the citric acid yield and productivity.
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