Summary
A series of continuous fermentations were carried out with a production strain of the yeast Saccharomyces cerevisiae in a membrane bioreactor. A membrane separation module composed of ultrafiltration tubular membranes retained all biomass in a fermentation zone of the bioreactor and allowed continuous removal of fermentation products into a cell-free permeate. In a system with total (100%) cell recycle the impact of fermentation conditions [dilution rate (0.03–0.3 h−1); substrate concentration in the feed (50–300 g·1−1); biomass concentration (depending on the experimental conditions)] was studied on the behaviour of the “immobilized” cell population and on ethanol formation. Maximum ethanol productivity (15 g·1−1·h−1) was attained at an ethanol concentration of 81 g·1−1. The highest demands of cells for maintenance energy were found at the maximum feed substrate concentration (300 g·1−1) and at very low concentrations of cells in the broth.
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Melzoch, K., Rychtera, M., Markvichov, N.S. et al. Application of a membrane recycle bioreactor for continuous ethanol production. Appl Microbiol Biotechnol 34, 469–472 (1991). https://doi.org/10.1007/BF00180572
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DOI: https://doi.org/10.1007/BF00180572