In this article a modeling of a draft‐tube airlift fermentor (ALF) based on perfect backmixing of liquid and plugflow for gas bubbles has been carried out to optimize the design and operation of fermentation units at different working capacities. With reference to a whey fermentation by yeasts the economic optimization has led to a slim ALF with an aspect ration of about 15. As far as power expended per unit of oxygen transfer is concerned, the responses of the model are highly influenced by kLa However, a safer use of the model has been suggested in order to assess the feasibility of the fermentation process under study.
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Mauro Moresi (1981) studied this question.
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