摘要
研究了用酒精滤液代替原来的工艺用水进行细菌酒精连续发酵试验的可行性;建立了单级无回流连续发酵系统,在稀释率为0.35h-1时,酒精产量为64.0g/L,发酵强度达到22.4g/(L·h);考察了回流比分别为0.5,1.0,稀释率为0.3,0.35,0.4h-1时,滤液回流对连续发酵系统的影响.结果表明:进行一定时间的酒糟滤液全回流的连续回流发酵是可行的,但最大稀释率不宜大于0.35h-1,此时连续发酵的生产强度为22.1g/(L·h),酒精产量为63.1g/L.
Distillage recycle, as a kind of economic and effective method to eliminate pollutant in the ethanol production, was studied in the continuous fermentation system in this paper.Different operating parameters such as recycle ratio(0.5,1.0) and dilution rate (0.3,0.35,0.4 h^(-1)) were tested in the continuous system. The continuous ethanol production with complete distillage recycle was availiable for a certain period provided that the dilution rate was controlled below (0.35) h^(-1), while an ethanol concentration and productivity of 63 g/L and 22.1 g/(L·h) could be achieved by this continuous fermentation system. The results showed the feasibility of the continuous fermentation system with full distillage recycle.
基金
江苏省科委青年基金项目(BQ98039)资助课题.
