运动发酵单胞菌酒精发酵糟液的全回流技术

酒精生产会产生大量的酒糟废液,若不适当处理,将会对环境造成严重的污染。文中将细菌酒精发酵废液经过过滤后,代替拌料用水,循环用于酒精生产。回流发酵进行了8批,酒精产量没有降低,体积分数稳定在7.3％左右。发酵液残糖和最终pH也趋于稳定,分别在1.5g/L和4.0上下波动。相对于酵母酒糟回流技术,细菌酒糟回流技术所需的处理过程更简单。而且在回流中,不需要每次都添加氮源,这样可以减少发酵有害物质的积累,有利于实现酒糟滤液全回流。

Study on Recycling Process of the Stillage in the Ethanol Fermentation by Zymomonas mobilis

Ethanol production could carry out large amount of ethanol stillage, which is one of main pollution sources in ethanol fermentation. But if the filtrate from stillage is used to replace process water in the ethanol fermentation, the pollution can be eliminated and the nutrients in the stillage can be re-used. In this paper, the filtrate of the ethanol stillage is used as water and nourishment for ethanol production. The average value with 7.3% (v/v) was obtained from eight recycle periods by the new process. By the same token, the residual sugar of 1.5g/L and final pH of 4.0 were observed. The new Zymomonas mobilis fermentation process only needs a simple apparatus for filtration of the fermented broth; the nitrogen sources, such as peptone and yeast extract, can be reused each time. As a result, this new process eliminates pollution and reduces the cost of ethanol production.