ISSN:
1432-0614
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Summary Continuous fermentation of concentrated molasses to ethanol with simultaneous product removal has been studied in a series of week-long continuous experiments. Influence of oxygen tension on ethanol yield and yeast growth has been studied for two different yeast strains, one Saccharomyces cerevisiae and one Schizosaccharomyces pombe. As expected, ethanol yield showed a steady decline for increasing oxygen tension. Yeast growth which increases with oxygen tension up to about 1,000 ppb, is sufficient for continuous fermentation already at 50 ppb O2. In contrast to Saccharomyces cerevisiae, Schizosaccharomyces pombe shows a somewhat decreased growth at oxygen tensions above 103 ppb. A product yield of 90% could be sustained on a continuous basis, and no inhibition was observed as a result of the accumulation of non-fermentables up to at least 20% dry solids equivalent to an osmotic pressure of about 2,500 m Osm.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00498467
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