College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China; National Energy R&D Center for Non-Food Biomass, China Agricultural University, Beijing 100193, China; Department of Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
College of Water Resource and Civil Engineering, China Agricultural University, Beijing 100193, China; Department of Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Bioresour Technol. 2019 May;279:57-66. doi: 10.1016/j.biortech.2019.01.095. Epub 2019 Jan 23.
Hydrothermal pretreatment (HTP) using an acidic catalyst is known to be effective for reducing lignocellulosic biomass recalcitrance. Post-hydrothermal liquefaction wastewater (PHW) from hydrothermal liquefaction of swine manure contains a large fraction of organic acids and thus was introduced to improve the HTP of cornstalk in this study. The response surface methodology was performed to optimize operating parameters of HTP for preserving structural polysaccharides while removing the barrier substances. A remarkable co-extraction of cell wall polymers was observed during PHW-catalyzed HTP at 172 °C for 88 min. The analysis of particle size, crystalline cellulose, the degree of polymerization (DP), mole number (MN) and SEM suggested that the co-extraction effect could distinctively alter lignocellulosic structures associated with recalcitrance and thus accelerate biomass saccharification. Additionally, the biodegradability of PHW was improved after HTP as a result of balanced nutrients and increased acids and sugars suitable for biogas production via anaerobic fermentation.
水热预处理（HTP）使用酸性催化剂被认为是降低木质纤维素生物质顽固性的有效方法。来自猪粪水热液化的后水热液化废水（PHW）含有大量的有机酸，因此被引入到本研究中以改善玉米秸秆的 HTP。采用响应面法优化 HTP 的操作参数，以在去除障碍物质的同时保留结构多糖。在 172°C 下进行 88 分钟的 PHW 催化 HTP 时，观察到细胞壁聚合物的显著共提取。颗粒大小、结晶纤维素、聚合度（DP）、摩尔数（MN）和 SEM 的分析表明，共提取效应可以明显改变与顽固性相关的木质纤维素结构，从而加速生物质糖化。此外，由于营养物质平衡以及适合通过厌氧发酵生产沼气的酸和糖增加，HTP 后 PHW 的生物降解性得到提高。
