Continuous alkaline pretreatment of Miscanthus sacchariflorus using a bench-scale single screw reactor
2015
Cha, Young-Lok | Yang, Jungwoo | Park, Yuri | An, Gi Hong | Ahn, Jong-Woong | Moon, Youn-Ho | Yoon, Young-Mi | Yu, Gyeong-Dan | Choi, In-Hu
Miscanthus sacchariflorus ‘Goedae-Uksae 1’ (GU) was developed as an energy crop of high productivity in Korea. For the practical use of GU for bioethanol production, a bench-scale continuous pretreatment system was developed. The reactor performed screw extrusion, soaking and thermochemical pretreatment at the following operating conditions: 3mm particle size, 22% moisture content, 140°C reaction temperature, 8min residence time, 15g/min biomass feeding and 120mL/min NaOH input. As a result of minimizing NaOH concentration and enzyme dosage, 90.8±0.49% glucose yield was obtained from 0.5M NaOH-pretreated GU containing 3% glucan with 10FPUcellulase/g cellulose at 50°C for 72h. The separate hydrolysis and fermentation of 0.5M NaOH-pretreated GU containing 10% glucan with 10–30FPU for 102h produced 43.0–49.6g/L bioethanol (theoretical yield, 75.8–87.6%). Thus, this study demonstrated that continuous pretreatment using a single screw reactor is effective for bioethanol production from Miscanthus biomass.
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