The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.
Bioresour Technol. 2012 Sep;120:206-11. doi: 10.1016/j.biortech.2012.06.032. Epub 2012 Jun 26.
An integrated ethanol-methane fermentation system was proposed to resolve wastewater pollution in cassava ethanol production. In the integrated system, wastewater originating from ethanol distillation was treated by two-stage anaerobic digestion and then used in medium for the next batch of ethanol fermentation. Ammonium and other components in the effluent promoted yeast growth and fermentation rate but did not increase the yield of ethanol. Fermentations with the effluent as the nitrogen source showed higher growth and ethanol production rates (0.215 h(-1) and 1.276 g/L/h, respectively) than urea that resulted in corresponding rates of 0.176 h(-1) and 0.985 g/L/h, respectively. Results indicated that anaerobic digestion effluent can be used as nitrogen source for the ethanol fermentation instead of urea in the ethanol-methane fermentation system.
提出了一种集成的乙醇-甲烷发酵系统，以解决木薯乙醇生产中的废水污染问题。在集成系统中，来自乙醇蒸馏的废水经过两段厌氧消化处理，然后用于下一批乙醇发酵的培养基中。废水中的铵和其他成分促进了酵母的生长和发酵速率，但不会增加乙醇的产量。以废水为氮源的发酵表现出更高的生长和乙醇生产速率（分别为 0.215 h(-1)和 1.276 g/L/h），而尿素的相应速率分别为 0.176 h(-1)和 0.985 g/L/h。结果表明，厌氧消化废水可以用作乙醇-甲烷发酵系统中乙醇发酵的氮源，而不是尿素。
