Fermentation Techniques of Producing Alcohol with Cassava Starch

The fermentation conditions for generating alcohol from cassava starch were studied in this experiment using alcohol concentration as index.The single factors used in fermentation were carried out on reaction time,temperature,pH,nitrogen source,additive dosage of ammonium sulfate and yeast.The results showed that with reacting time 72to 84h,temperature 35to 40℃,pH 4.5to 5.0,ammonium sulfate 1.0%to 1.2%and yeast 10% to 15%,the alcohol generating of cassava starch revealed the best efficiency.By orthogonal experiment,the optimum fermentation conditions were determined as adding 1.2%ammonium sulfate and 15%yeast,fermenting at 40℃for 84h;of which the alcohol concentration and the yield of liquor reached to 11.16%(V/V)and 52.19%,respectively.