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Features of a Staged Acidogenic/Solventogenic Fermentation Process To Improve Butanol Production from Rice Straw
Energy & Fuels ( IF 5.2 ) Pub Date : 2018-12-31 00:00:00 , DOI: 10.1021/acs.energyfuels.8b03095 Xue Chi 1, 2 , Jianzheng Li 1 , Shao-Yuan Leu 3 , Xin Wang 1 , Yafei Zhang 1 , Ying Wang 3
Energy & Fuels ( IF 5.2 ) Pub Date : 2018-12-31 00:00:00 , DOI: 10.1021/acs.energyfuels.8b03095 Xue Chi 1, 2 , Jianzheng Li 1 , Shao-Yuan Leu 3 , Xin Wang 1 , Yafei Zhang 1 , Ying Wang 3
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This study introduced an innovative two-stage fermentation process to maximize sugar utilization and biobutanol production from alkaline-pretreated rice straw. The new bioconversion process was composed of an acidogenic fermentation process followed by an acetone–butanol–ethanol (ABE) fermentation process. A sugar-rich hydrolysate (90.4 g/L reducing sugar) and a high acid content fermentation broth (33.9 g/L butyric acid), both produced from rice straw, were mixed together to increase the yield of the biofuels in the ABE fermentation process. Butyric acid and acetic acid generated from the acidogenic fermentation process play a critical role in the ABE fermentation process, which was confirmed by gene expression analysis of five messenger RNAs. Compared with the conventional process, this unique strategy increased the final butanol concentration from 6.2 to 15.9 g/L with 3-fold lower cellulase loading. Furthermore, an enhanced production of 149 g butanol and 36 L hydrogen gas from 1 kg rice straw was achieved, which is approximately equivalent to the energy contained in 124 and 15 g gasoline, respectively. Thus, the novel two-stage fermentation process was an effective and economic new approach for energy generation from lignocellulosic biomass.
中文翻译：
分阶段产酸/产溶剂发酵工艺的特点，可提高稻草中丁醇的产量
这项研究引入了创新的两阶段发酵工艺，以最大程度地利用碱预处理的稻草来利用糖和生产生物丁醇。新的生物转化过程包括产酸发酵过程，然后是丙酮-丁醇-乙醇（ABE）发酵过程。将稻草生产的富含糖的水解产物（90.4 g / L的还原糖）和高酸含量的发酵液（33.9 g / L的丁酸）混合在一起，以提高ABE发酵过程中生物燃料的产量。产酸发酵过程中产生的丁酸和乙酸在ABE发酵过程中起着关键作用，这通过对五个信使RNA的基因表达分析得到证实。与传统工艺相比，这种独特的策略将最终丁醇的浓度从6.2 g / L提高到15.9 g / L，纤维素酶含量降低了3倍。此外，从1千克稻草中获得了149克丁醇和36升氢气的增产，这分别相当于124克和15克汽油中的能量。因此，新颖的两阶段发酵过程是从木质纤维素生物质产生能量的有效且经济的新方法。
更新日期：2018-12-31
中文翻译：
分阶段产酸/产溶剂发酵工艺的特点，可提高稻草中丁醇的产量
这项研究引入了创新的两阶段发酵工艺，以最大程度地利用碱预处理的稻草来利用糖和生产生物丁醇。新的生物转化过程包括产酸发酵过程，然后是丙酮-丁醇-乙醇（ABE）发酵过程。将稻草生产的富含糖的水解产物（90.4 g / L的还原糖）和高酸含量的发酵液（33.9 g / L的丁酸）混合在一起，以提高ABE发酵过程中生物燃料的产量。产酸发酵过程中产生的丁酸和乙酸在ABE发酵过程中起着关键作用，这通过对五个信使RNA的基因表达分析得到证实。与传统工艺相比，这种独特的策略将最终丁醇的浓度从6.2 g / L提高到15.9 g / L，纤维素酶含量降低了3倍。此外，从1千克稻草中获得了149克丁醇和36升氢气的增产，这分别相当于124克和15克汽油中的能量。因此，新颖的两阶段发酵过程是从木质纤维素生物质产生能量的有效且经济的新方法。
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