Ethanol fermentation of raw cassava starch with Rhizopus koji in a gas circulation type fermentor

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Abstract
Studies have been conducted in a gas circulation type fermentor in order to characterize the ethanol fermentation of uncooked cassava starch with Rhizopus koji. Results showed that ethanol concentration reached 13‐14% (v/v) in 4‐day broth, and the maximum productivity of ethanol was 2.3 g ethanol/L broth h. This productivity was about 50% compared to the productivity of a glucose‐yeast system. Ethanol yield reached 83.5‐72.3% of the theoretical yield for the cassava starch used. The fermentor used in the present work has been proven by experiment to be suitable for ethanol fermentation of the broth with solid substrate.