Enhanced enzymatic digestibility of bamboo by a combined system of multiple steam explosion and alkaline treatments

Author

Shao-Long Sun, Jia-Long Wen, Ming-Guo Ma and Run-Cang Sun

Applied Energy, 2014, vol. 136, issue C, pages 519-526

Abstract: A combined system based on multiple steam explosion pretreatments (direct pretreatment and presoaked in 1% KOH aqueous solution followed by pretreatment under different conditions) and mild alkaline post-treatment has been developed to obtain digestible substrates from bamboo stems for bioethanol production. After the pretreatments, the enzymatic digestibility of cellulose increased to 17.1–32.2%, as compared to that of the untreated bamboo stems (5.8%). Direct pretreatment followed by alkaline treatment increased the enzymatic digestibility of cellulose to a maximum value of 73.8%. Alkaline treatment removed most of lignin and hemicelluloses, and incurred a higher crystalline index of the cellulose-rich residue obtained after a synergistic treatment as compared to the only steam-exploded substrates. The combination of direct pretreatment and alkaline treatment is an environmentally friendly and economical feasible method for the production of glucose and high-purity lignin, which will be further converted into high value-added products based on biorefinery.

Keywords: Bamboo stem; Steam explosion; Alkaline treatment; Cellulose digestibility; Enzymatic hydrolysis (search for similar items in EconPapers)
Date: 2014
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