Department of Biological and Agricultural Engineering, Kansas State University, Manhattan, KS 66506, USA.
Bioprocess Biosyst Eng. 2012 May;35(4):615-23. doi: 10.1007/s00449-011-0642-8. Epub 2011 Oct 11.
Pelleting of biomass can increase their bulk density and thus improve storability and reduce transportation costs. The objective of this research was to determine the effects of the pelleting conditions on chemical composition and fermentable sugar yield of the biomass. Corn stover, wheat straw, big bluestem, and sorghum stalks were used for this study. Dilute sulfuric acid was used for biomass pretreatment. Accellerase 1500™ was used for cellulose hydrolysis. Effects of mill screen size, die thickness, and L/D ratio of die on chemical compositions and sugar yield were determined. Glucan content of the biomass was positively affected by die thickness and negatively affected by mill screen size. Opposite trend was observed for xylan content. Wheat straw pellets had the highest sugar yield (92.5-94.1%) and big bluestem pellets had the lowest sugar yield (83.6-91.1%). Optimum pelleting condition is 6.5 mm screen size and 44.5 mm die thickness.
颗粒化生物质可以增加其堆积密度，从而提高储存稳定性并降低运输成本。本研究的目的是确定颗粒化条件对生物质的化学成分和可发酵糖产量的影响。本研究使用了玉米秸秆、小麦秸秆、柳枝稷和高粱秸秆。采用稀硫酸对生物质进行预处理。使用 Accellerase 1500™进行纤维素水解。确定了磨盘筛尺寸、压模厚度和压模长径比对化学成分和糖产量的影响。生物质中葡聚糖的含量受压模厚度的影响呈正相关，受磨盘筛尺寸的影响呈负相关。木聚糖的含量则呈现相反的趋势。小麦秸秆颗粒的糖产量最高（92.5-94.1%），柳枝稷颗粒的糖产量最低（83.6-91.1%）。最佳颗粒化条件为 6.5mm 筛网尺寸和 44.5mm 压模厚度。
