Studies on continuous ethanol fermentation of sugar cane molasses
✍ Scribed by Åke Haraldson; Carl-Gustaf Rosén
- Publisher
- Springer
- Year
- 1982
- Tongue
- English
- Weight
- 301 KB
- Volume
- 14
- Category
- Article
- ISSN
- 1432-0614
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✦ Synopsis
A new laboratory system for continuous fermentation is described. It is well suited for fermenting concentrated substrates such as moderately dilute molasses. A rotating microporous filter, which is annexed to the fermentor vessel, allows the free escape of metabolic products while retaining yeast in the fermentor.
The slop is recirculated after removal of ethanol by distillation leading to a build-up of non-fermentables. The concentration of these and of yeast cells is checked by a controlled bleed. The described system is a useful tool for small-scale experiments on continuous ethanol fermentation.
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The efficiency of ethanol yield increased from 61% to 88% of the theoretical value as the filling-up time was approached in fed-batch fermentation with Saccharomyces cerevisiae. Temporary accumulation of ethanol within the yeast cells may explain the above variation.
## Abstract **BACKGROUND:** Bio‐ethanol production from renewable sources, such as sugar cane, makes it a biofuel that is both renewable and environmentally friendly. One of the strategies to reduce production costs and to make ethanol fuel economically competitive with fossil fuels could be the us