Development and application of a flexible controller in yeast fermentations using pO2 cascade control

The development and application of a flexible process controller in fed‐batch yeast fermentations using pO₂ cascade control was performed. A new algorithm for fed‐batch fermentations using pO₂ cascade control was developed, the concept of which could be used as a realizable solution in fermentation systems equipped according to the basic configuration. The algorithm is based on the combined influence of pO₂ and pH on the substrate feeding intensity. To test and develop this algorithm, Saccharomyces cerevisiae DY 7221 and Candida tropicalis CK‐4 fermentations were carried out. As a result of the use of the combined algorithm, the specific growth rate and productivity grew in both fermentations. In this case, the effect of the use of the algorithm was most pronounced in the C. tropicalis fermentation.