Abstract
Considered to be the cleanest liquid fuel, bio-ethanol can be a reliable alternative to fossil fuels. It is produced by fermentation of sugar components of plant materials. The common onions are considered to be a favorable source of fermentation products as they have high sugar contents as well as contain various nutrients. This study focused on the effective production of ethanol from Green onion (Allium fistulosum L.) by the yeast "Saccharomyces cerevisiae" in repeated batch. The results showed that the total sugar concentration of onion juice was 68.4g/l. The maximum rate of productivity, ethanol yield and final bio-ethanol percentage was 7g/l/h (g ethanol per liter of onion juice per hour), 35g/l (g ethanol per liter of onion juice) and 90%, respectively.
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