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SCREENING OF ZYMOMONAS MOBILIS AND SACCHAROMYCES CEREVISIAE STRAINS FOR ETHANOL PRODUCTION FROM CASSAVA WASTE

Natarajan Raman, C. Pothiraj

Abstract

The efficient ethanol production using Zymomonas mobilis (NRRL B808) and Saccaromyces cerevisiae (NRRL Y898) in utilizing the sago industry waste (Tippi), was studied in the liquid state fermentation process. The fermentation parameter for ethanol production was optimized for various pH and temperature ranges. Both strains of Z.mobilis and S.cerevisiae were selected for ethanol production potential at optimized conditions because Z.mobilis can tolerate in higher sugar concentration (more than 15%) and also S.cerevisiae is higher ethanol tolerant. Ethanol production at pH 6.0 and 36 h (residence time) of fermentation was the highest in the Z.mobilis mediated fermentation (5 % more) than the ethanol production rate of S.cerevisiae.

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Key concepts: Zymomonas mobilis, Ethanol fuel, Fermentation, Ethanol fermentation, Ethanol, Saccharomyces cerevisiae, Chemistry, Food science