Study On Circle Process Of Alcohol Production From Cassava

Reuse process of marsh liquid could prevent secondary pollution from the biological treatment of the alcohol distillation waste liquid. It could save plenty of water resources. Biogas from the anaerobic biological treatment could be usde as fuel, which reduced the energy input in the alcohol production. The treatment cost of alcohol distillation waste liquid reduced after abolished the aerobic biological reatment, and reduced the cost of alcohol production.It was not found the inhibitory effects of marsh liquid on liquefaction process,saccharification process and ferment process. The growth curve was determined when the yeasts were cultivated on the biogas slurry saccharification liquid and tap water saccharification liquid. On the equilibrium phase the yeast amount of the former was 1.24×10~8/ml, which was 22.8% more than the latter which was 1.01×10~8/ml.Under the same condition, the residual total sugar content and residual reducing sugar content of the biogas slurry sample was 1.97% and 0.32% respectively, and the tap water sample was 3.78% and 2.07%.The residual total sugar content and residual reducing sugar content of the former was 50.8% and 84.5% less than the latter respectively, which reflects the promotion of the biogas slurry on the alcohol fermentation.when saccharifying enzyme was added in two different time, The residual total sugar content and residual reducing sugar content was higher than the sample respectively in which the saccharifying enzyme was added in one time.The addition of urea promoted the fermentation, and accelerated the fermentation rate. The differences between different burden water disappeared while the amount of urea addition increasing. The addition of urea had little contribution to reduce the residual sugar. The optimum content of urea was 0.3% when tap water used as burden water, and 0.1% when marsh liquid used as burden water.