Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300130, China.
Bioresour Technol. 2023 Feb;370:128569. doi: 10.1016/j.biortech.2022.128569. Epub 2022 Dec 31.
Food waste was used to produce ethanol by yeast fermentation and volatile fatty acids (VFAs) by hydrolytic acidogenesis for chain elongation. Effectiveness of mole ratio of ethanol in yeast fermentation effluent (YFE) to VFAs in hydrolytic acidification effluent (HAE) on chain elongation was examined. The ideal YFE to HAE ratio for chain elongation was 2:1, the highest n-caproate production was 169.76 mg COD/g vS and the food waste utilization was 65.43 %. Electron transfer and carbon distribution did not completely correspond to n-caproate production, suggesting timely product extraction. The abundance of Romboutsia and Clostridium_sensu_stricto_12 increased as chain elongation progressed, which was critical for the chain elongation to n-caproate. The food waste shunting ratio of yeast fermentation to hydrolytic acidogenesis was 6:5, and 572.6 CNY can be created through chain elongation from shunting fermentation of 1 t food waste. This study proposed a new approach for efficient producing n-caproate from food waste.
采用酵母发酵将食物垃圾转化为乙醇，利用水解产酸将挥发性脂肪酸（VFAs）转化为链延伸的挥发性脂肪酸（VFAs）。考察了酵母发酵废水中乙醇与水解酸化废水中挥发性脂肪酸摩尔比对链延伸的影响。链延伸的最佳 YFE 与 HAE 比为 2:1，最大正己酸产量为 169.76mgCOD/gVS，食物垃圾利用率为 65.43%。电子转移和碳分布与正己酸的生成不完全对应，这表明需要及时提取产物。随着链延伸的进行，Romboutsia 和 Clostridium_sensu_stricto_12 的丰度增加，这对链延伸到正己酸至关重要。酵母发酵到水解酸化的食物垃圾分流比为 6:5，从 1 吨食物垃圾的分流发酵中通过链延伸可创造 572.6 元人民币的价值。本研究提出了一种从食物垃圾中高效生产正己酸的新方法。
