Abstract

For tower fermentors, i.e., bubble columns (BCs), treating various foaming liquids, the critical disk rotational speed N c required for foam-breaking of rotating-disk mechanical foam-breakers (MFRDs) fitted to BCs was studied in relation to the foaming characteristics of the liquids. An empirical equation was presented for predicting N c in foam-breaking regions. With this equation, it was found that prediction of N c of MFRDs fitted to BCs treating various liquids was possible regardless of the type of foaming liquid or its concentration.

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