A study of gas hold‐up, liquid velocity, and mixing time in a complex high viscosity, fermentation fluid in an airlift bioreactor

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Abstract
Whole mean gas hold‐up εg, liquid recirculation velocity U1d and mixing time tm were measured in a 0.12 m3 airlift reactor, with an external recirculation loop (ALR‐EL), which was used for the production of the exopolysaccharide, Scleroglucan, by cultivation of the filamentous fungus, Scleroticum glucanicum. Under identical fermentation conditions, the effects of air flowrate and the viscosity of the culture fluid on εg, U1d, and tm were investigated. In the range studied, empirical correlation for εg, U1d and tm with both superficial velocity Ugr and consistency coefficient K were obtained and expressed separately.
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