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Co-production of high-gravity bioethanol and succinic acid from potassium peroxymonosulfate and deacetylation sequentially pretreated sugarcane bagasse by simultaneous saccharification and co-fermentation

Bu, Jie, Yan, Xing, Wang, Yu-Tao, Zhu, Si-Ming, Zhu, Ming-Jun
Energy conversion and management 2019 v.186 pp. 131-139
bioethanol, biorefining, ethanol, fermentation, lignin, lignocellulose, moieties, potassium, saccharification, succinic acid, sugarcane bagasse, yeasts
Pretreatment is a necessary step in the process of biorefinery of lignocellulosics. Here, a novel sequential sugarcane bagasse (SCB) pretreatment method was developed based on potassium peroxymonosulfate (PMS) and alkaline deacetylation (AD) under mild conditions. The co-pretreatment could efficiently remove the lignin and acetyl groups, resulting in a holocellulose-rich (83.5%) solid with superior degradability and a high overall recovery of holocellulose (81.2%). Meanwhile, the highest ethanol titer of 120.77 g/L and succinic acid production of 34.84 g/L were obtained by simultaneous saccharification and co-fermentation (SSCF) without the sterilization process for the pretreated SCB (equivalent to an ethanol yield of 0.36 g/g and a succinic acid yield of 0.10 g/g from the holocellulose in raw SCB). These results demonstrated that a high level of bioethanol and bio-based succinic acid can be achieved by the combination of the newly-developed SCB pretreatment method and the robust yeast strain.