초록
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<SUP>o</SUP>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<SUP>o</SUP>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.