Department of Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
Bioenergy Research Unit, National Center for Agricultural Utilization Research, USDA-ARS, Peoria, IL 61604, USA.
Bioresour Technol. 2019 Oct;289:121663. doi: 10.1016/j.biortech.2019.121663. Epub 2019 Jun 18.
Chemical-free pretreatments are attracting increased interest because they generate less inhibitor in hydrolysates. In this study, pilot-scaled continuous hydrothermal (PCH) pretreatment followed by disk refining was evaluated and compared to laboratory-scale batch hot water (LHW) pretreatment. Bioenergy sorghum bagasse (BSB) was pretreated at 160-190 °C for 10 min with and without subsequent disk milling. Hydrothermal pretreatment and disk milling synergistically improved glucose and xylose release by 10-20% compared to hydrothermal pretreatment alone. Maximum yields of glucose and xylose of 82.55% and 70.78%, respectively were achieved, when BSB was pretreated at 190 °C and 180 °C followed by disk milling. LHW pretreated BSB had 5-15% higher sugar yields compared to PCH for all pretreatment conditions. The surface area improvement was also performed. PCH pretreatment combined with disk milling increased BSB surface area by 31.80-106.93%, which was greater than observed using LHW pretreatment.
无化学预处理方法因在水解物中产生较少抑制剂而受到越来越多的关注。在这项研究中，评估并比较了中试规模连续热液（PCH）预处理后再进行盘式精磨与实验室规模分批热水（LHW）预处理。采用 160-190°C 热液预处理 10min 对生物质甜高粱渣（BSB）进行预处理，同时或不进行后续的盘式磨浆。与单独的热液预处理相比，热液预处理和盘式磨浆协同作用可将葡萄糖和木糖的释放率提高 10-20%。当 BSB 在 190°C 和 180°C 下预处理并随后进行盘式磨浆时，可分别实现 82.55%和 70.78%的最大葡萄糖和木糖收率。与 PCH 相比，对于所有预处理条件，LHW 预处理的 BSB 的糖收率均高 5-15%。还进行了表面积改善。PCH 预处理与盘式磨浆相结合，使 BSB 的表面积增加了 31.80-106.93%，大于 LHW 预处理的增加幅度。
