The use of oxygen uptake rate to optimise air feed rate to a continuous ethanol fermentation

Catherine Hack, R Marchant, W McClean

Research output: Contribution to journalArticlepeer-review


In a continous ethanol fermentation in a stirred tank reactor, the effect of oxygen transfer rate on the biomass concentration, specific activity and overall ethanol productivity of a thermo-tolerant yeast Kluyveromyces marxianus was investigated. The dissolved oxygen concentration was maintained at zero. Although an increased oxygen transfer rate led to an increase in biomass concentration, the reduction in specific activity led to a reduction in overall ethanol productivity. The optimum oxygen transfer rate was zero. The maximum ethanol productivity was 1.3 mL/L h. The ethanol productivity in the stirred tank reactor was compared with two alternative fermenter configurations: - two fermenters in series - poorly mixed aerated fermenter An ethanol productivity of 3.9 mL/L h was achieved in both these systems.
Original languageEnglish
Pages (from-to)187-190
JournalPrehrambeno-tehnoloska i Biotehnoloska Revija
Issue number4
Publication statusPublished (in print/issue) - Oct 1994

Bibliographical note

2nd Croatian Congress of Food Technologists, Biotechnologists and Nutritionists, ZAGREB, CROATIA, JUN 15-17, 1994


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