木薯酒精发酵时,采用"酒精沼气双发酵耦联"工艺会积累SO42-及其还原产物,对"双发酵耦联"工艺的顺利进行不利,为解决该问题,研究了硫酸盐、亚硫酸盐以及S2-对木薯酒精高浓发酵(料水比1∶2.2)的影响,结果表明,SO42-对木薯酒精发酵基本没有影响,而SO32-和S2-对木薯酒精发酵影响显著。在实验所添加的SO32-和S2-浓度范围内,随着硫化物浓度的增加,酒精产量逐渐降低,而副产物甘油产量逐渐升高;并且S2-的加入使发酵时间延长,当S2-浓度为6.0 mmol/L时,发酵时间延迟48 h。后两者均对乙醇发酵不利,应在双循环耦联工艺中去除。

The sulphate and its reduction products could be accumulated in Dual Coupling of Ethanol and Methane Fermentation Process which do harm to the whole process.The effect of three sulfides including sulphate sulfite and sulfion on ethanol fermentation of very high gravity cassava mashes(the ratio of cassava and water to 1∶ 2.2(w/w) was researched in this article.The final results showed that sulfite and sulfion had great influence on ethanol fermentation,but sulphate had not.With the sulfite and sulfion concentration increased under the experiments concentration,the yield of ethanol decreased and the byprocuct glycerol increased.The lag phase delayed when the fermentation mashes added with sulfion.It delayed to 48h when the sulfion concentration was 6.0 mmol/L.Both of the two sulfides that harmed ethanol fermentation needed to be eliminated during the dual coupling fermentation.