Zhang Bin, Liu Xiucai, Bao Jie
State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
Cathay Biotech Inc, 1690 Cailun Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China.
Bioresour Technol. 2023 Feb;369:128334. doi: 10.1016/j.biortech.2022.128334. Epub 2022 Nov 17.
Pretreatment is the first and most determinative, yet the least mature step of lignocellulose biorefinery chain. The current stagnation of biorefinery commercialization indicates the barriers of the existing pretreatment technologies are needed to be unlocked. This review focused on one of the core factors, the high lignocellulose solids loading in pretreatment. The high solids loading of pretreatment significantly reduces water input, energy requirement, toxic compound discharge, solid/liquid separation costs, and carbon dioxide emissions, improves the titers of sugars and biproducts to meet the industrial requirements. Meanwhile, lignocellulose feedstock after high solids loading pretreatment is compatible with the existing logistics system for densification, packaging, storage, and transportation. Both the technical-economic analysis and the cellulosic ethanol conversion performance suggest that the solids loading in the pretreatment step need to be further elevated towards an industrial technology and the effective solutions should be proposed to the technical barriers in high solids loading pretreatment operations.
预处理是木质纤维素生物精炼链的第一步，也是最具决定性但最不成熟的步骤。目前生物精炼商业化的停滞表明，现有预处理技术的障碍需要被突破。本综述聚焦于核心因素之一，即预处理中高木质纤维素固体负荷。预处理的高固体负荷显著减少了水的输入、能源需求、有毒化合物排放、固液分离成本和二氧化碳排放，提高了糖和副产品的滴度以满足工业需求。同时，经过高固体负荷预处理后的木质纤维素原料与现有的致密化、包装、储存和运输物流系统兼容。技术经济分析和纤维素乙醇转化性能均表明，预处理步骤中的固体负荷需要进一步提高以实现工业化技术，并应针对高固体负荷预处理操作中的技术障碍提出有效的解决方案。
