Industrial Crops and Products ( IF 5.9 ) Pub Date : 2021-01-30 , DOI: 10.1016/j.indcrop.2021.113268 Xiangyu Gu , Xiao Fu , Shulin Chen
Although it is considered to be an environmental-friendly approach to reduce recalcitrance of lignocellulosic biomass, current fungal pretreatment methods suffer from major weaknesses, including inefficient delignification, loss of cellulose, and the need for long processing time. The addition of Mn to white-rot fungal treatment process could facilitate selective removal of lignin. However, the effect of Mn addition on the thermal decomposition and conversion of fungi-pretreated biomass is not clear. In this study, three types of lignocelluloses (poplar, wheat straw, and corn stover) were pretreated with fungi that was cultured with Mn supplements. Results demonstrated that the Mn addition affected thermogravimetric properties, as well as lignin and hemicellulose contents. The poplar samples showed the highest delignification (50.5 %) and lowest loss of cellulose (1.1 %). The initial degradation temperatures were lowered by 11–36 ℃, measured with thermogravimetric analysis. Additionally, fungi-pretreated feedstocks were converted in a two-stage hydrothermal liquefaction process to produce hydrolyzed sugars and value-added derivatives in a stepwise manner. A 163.6 % more hemicellulose sugars were recovered from poplar with the addition of Mn compared with untreated samples, while 75.2 % of hemicellulose sugar production was achieved in the first stage from fungi-treated corn stover with the Mn addition. Pretreating lignocelluloses with fungi that includes Mn supplements significantly improved sugar production. Thus, the combination of fungal pretreatment with the subsequent thermochemical conversion process offers a promising alternative technical route for lignocellulosic biomass valorization.
中文翻译:
木质素纤维素的水热液化转化及增强的真菌预处理
尽管它被认为是减少木质纤维素生物质顽固性的环保方法,但是当前的真菌预处理方法仍存在主要缺点,包括效率低下的脱木素,纤维素损失以及需要较长的加工时间。在白腐真菌处理过程中添加锰可以促进木质素的选择性去除。但是,Mn添加对真菌预处理的生物质的热分解和转化的影响尚不清楚。在这项研究中,三种类型的木质纤维素(杨木,小麦秸秆和玉米秸秆)都用真菌进行了预处理,该真菌与Mn补充剂一起培养。结果表明,锰的添加会影响热重性能,以及木质素和半纤维素的含量。杨树样品显示出最高的脱木素率(50。5%)和最低的纤维素损失(1.1%)。用热重分析法测得的初始降解温度降低了11–36℃。另外,将经过真菌预处理的原料在两阶段水热液化过程中进行转化,以逐步生产水解糖和增值衍生物。与未处理的样品相比,添加了Mn的白杨收成的半纤维素糖多了163.6%,而在添加了Mn的经过真菌处理的玉米秸秆的第一阶段中,半纤维素糖的产量达到了75.2%。用含有锰的真菌对木质纤维素进行预处理可以显着提高糖的产量。从而,