Momayez Forough, Karimi Keikhosro, Sárvári Horváth Ilona
Department of Chemical Engineering, Isfahan University of Technology Isfahan 84156-83111 Iran.
Swedish Centre for Resource Recovery, University of Borås 501 90 Borås Sweden
RSC Adv. 2019 Sep 3;9(47):27692-27701. doi: 10.1039/c9ra05285b. eCollection 2019 Aug 29.
The use of liquid fraction of biogas digestate (LFBD) instead of fresh water (hydrothermal) for the pretreatment of wheat straw was evaluated to improve the yield of released sugars during the following hydrolysis step. The pretreatments were conducted at temperatures of 130, 160, and 190 °C for 30 and 60 min. In most of the cases, pretreatment using LFBD led to higher glucose yields and higher total sugars concentrations, compared to those obtained after applying hydrothermal pretreatments. The increase of temperature resulted in an increase in sugars during the enzymatic hydrolysis. The highest yields of glucose (about 59%) were observed after treatments at 190 °C for 60 min, independently of which type of pretreatment was applied and at 190 °C for 30 min using LFBD. Treatment, with LFBD at 190 °C and for 60 min, resulted in glucose and xylose concentrations of 7.36 g L and 2.41 g L, respectively, after the subsequent hydrolysis for 48 h. However, the FTIR analysis indicated that the crystallinity index remained rather constant after treatment. Both FTIR and compositional analysis showed that the removal of hemicelluloses was the main effect of the pretreatment.
评估了使用沼液消化液的液体部分（LFBD）而非淡水（水热法）对小麦秸秆进行预处理，以提高后续水解步骤中释放糖的产量。预处理在130、160和190°C的温度下进行30分钟和60分钟。在大多数情况下，与水热预处理后获得的结果相比，使用LFBD进行预处理可获得更高的葡萄糖产量和更高的总糖浓度。温度升高导致酶水解过程中糖含量增加。在190°C处理60分钟后，无论采用何种预处理类型，以及在190°C使用LFBD处理30分钟后，均观察到最高的葡萄糖产量（约59%）。在190°C使用LFBD处理60分钟后，后续水解48小时后，葡萄糖和木糖浓度分别为7.36 g/L和2.41 g/L。然而，傅里叶变换红外光谱（FTIR）分析表明，处理后结晶度指数保持相当稳定。FTIR和成分分析均表明，去除半纤维素是预处理的主要效果。
