Abstract
The behaviour of dispersed gas in large aerated stirred tank reactors is modelled by means of a Markov-process, which distinguishes between small recirculation bubbles with “stagnant gas” content, large rising bubbles with “active gas” content and exchange of stagnant and active gas contents, the “gas exchange” region at the impeller. The measurements of the gas residence time distributions (RTDs) in an 1.5 m3 aerated stirred tank reactor with water and Penicillium chrysogenum cultivation medium are interpreted by this model.
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