蒸发冷凝水对乙醇发酵具有抑制作用。该文采用臭氧(O3)氧化法处理蒸发冷凝水,氧化后的蒸发冷凝水回用于乙醇发酵。结果显示,氧化后蒸发冷凝水中的抑制物苯乙醇、糠醛的含量分别降低99.5%、100%, 而乙酸、丙酸的含量分别增加16.3%、22.4%。将氧化后的蒸发冷凝水用于乙醇发酵,乙醇产量比对照组提高8.3%,高活性酵母细胞比例升高至95%。研究认为,经O3氧化后蒸发冷凝水中大分子有机物被降解形成小分子羧酸,产生的羧酸可以提高高活性酵母细胞的比例进而促进乙醇发酵并提高乙醇的产量。因此采用臭氧氧化的方法可以实现蒸发冷凝水的全部回用。
Directly reusing condensate in the ethanol fermentation would inhibit its process. In this study, O3 oxidation method was used to treat the condensate, and the oxidized condensate was reused for ethanol fermentation. The results showed that the contents of phenylethanol and furfural in the oxidized condensate were decreased by 99.5% and 100%, respectively, while the contents of acetic acid and propionic acid were increased by 16.3% and 22.4%, respectively. When the oxidized condensate was used for ethanol fermentation, the ethanol yield was increased by 8.3% and the proportion of active yeast cells was increased to 95%. The results showed that the macromolecular organics in the condensate were degraded to small molecular carboxylic acids after O3 oxidation, which could increase the proportion of active yeast cells, ethanol fermentation efficiency and the yield of ethanol. As a result, the O3 oxidation method could realize the total reutilization of condensate in the ethanol fermentation.
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