Bioproducts, Sciences and Engineering Laboratory, Washington State University, Tri-Cities, Richland, WA 99354, United States.
Bioproducts, Sciences and Engineering Laboratory, Washington State University, Tri-Cities, Richland, WA 99354, United States.
Bioresour Technol. 2017 Mar;227:197-204. doi: 10.1016/j.biortech.2016.12.012. Epub 2016 Dec 21.
Volatile fatty acids (VFA) have been used as platform molecules for production of biofuels and bioproducts. In the current study, we examine the VFA production from wet-exploded corn stover through anaerobic fermentation using rumen bacteria. The total VFA yield (acetic acid equivalents) was found to increase from 22.8g/L at 2.5% total solids (TS) to 40.8g/L at 5% TS. It was found that the acetic acid concentration increased from 10g/L to 22g/L at 2.5% and 5% TS, respectively. An increased propionic acid production was seen between day 10 and 20 at 5% TS. Valeric acid (4g/L) was produced at 5% TS and not at 2.5% TS. Composition analysis showed that 50% of the carbohydrates were converted to VFA at 5% TS and 33% at 2.5% TS. Our results show that rumen fermentation of lignocellulosic biomass after wet explosion can produce high concentrations of VFA without addition of external enzymes of importance for the process economics of lignocellulosic biorefineries.
挥发性脂肪酸（VFA）已被用作生产生物燃料和生物制品的平台分子。在本研究中，我们使用瘤胃细菌通过厌氧发酵来研究从湿式爆破玉米秸秆中生产 VFA。发现总 VFA 产量（乙酸当量）从 2.5%总固体（TS）时的 22.8g/L 增加到 5%TS 时的 40.8g/L。发现乙酸浓度分别从 2.5%和 5%TS 时的 10g/L 增加到 22g/L。在 5%TS 时，丙酸产量在第 10 天到第 20 天之间增加。在 5%TS 时产生了 4g/L 的戊酸，而在 2.5%TS 时没有产生。组成分析表明，在 5%TS 时 50%的碳水化合物转化为 VFA，在 2.5%TS 时为 33%。我们的结果表明，湿式爆破木质纤维素生物质经过瘤胃发酵可以在不添加外部酶的情况下产生高浓度的 VFA，这对于木质纤维素生物炼制厂的工艺经济性很重要。
