바이오에탄올 생산을 위한 폐MDF의 전처리 및 효소 당화

Abstract

The objective of this study was designed to determine the possibility of bioethanol production from wasted medium density fiberboard (wMDF). We were investigated the enzymatic saccharification characteristics using the enzyme (Cellic CTec3) after pretreatment with sodium chlorite. According to the component analysis results, the lignin contents before and after the pretreatment of wMDF (milling using sieve size of <TEX>$1,000{\mu}m$</TEX>) was significantly reduced from 31.13% to 4.11%. Therefore, delignification ratio of pretreated wMDF was found to be up to about 87-89% depending on the sieve size. And we were tested to compare the saccharification ratio according to the sieve size of wMDF (<TEX>$1,000{\mu}m$</TEX>, <TEX>$200{\mu}m$</TEX>), but it was no significance depending on the sieve size. When enzyme dosage was 5% based on the substrate concentration, enzymatic saccharification ratio was obtained up to 70% by maintaining at <TEX>$50^{\circ}C$</TEX> for 72 hours. We could made the substrate concentration of pretreated wMDF (<TEX>$1,000{\mu}m$</TEX>) up to 12% and then enzymatic saccharification ratio was 76.8%, also contents of glucose and xylose were analyzed to 77,750 and 14,637 mg/L, respectively.