Abstract
AbstractThe time delay of oxygen probe response to the signal from a fermenter makes identification of the volumetric oxygen transfer coefficient kLa by the dynamic method more complicated. A coupled model involving the transient‐state oxygen balance of the fermenter together with the dynamic model of the oxygen probe must be then formulated, solved and identified.In this paper two simple models of air‐lift loop fermenters have been proposed and a coupled mathematical model of the fermenter – oxygen probe system has been developed. The identification procedure was used to estimate kLa values in the fermenter with internal circulation flow on the basis of experimental measurements. A comparison of evaluated and experimental indications of the probes placed at various heights of the column proves that the model presented gives a possibility of the first‐step approximation of kLa in loop fermenters.
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