Oxygen mass-transfer performance of low viscosity gas-liquid-solid system in a split-cylinder airlift bioreactor

The O2 mass-transfer coefficient, kLa, decreased by 20% when the viscosity of a simulated broth increased from 1.38 × 10−3 to 3.43 × 10−3 Pa s in a split-cylinder airlift bioreactor with a broth volume of 41 l. When the paper pulp concentration was below 10 g l−1, kLa hardly changed. While at 30 g l−1, kLa decreased by 56%. C2O42− and Na+ were found to have some effect on the kLa value.

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