Ethanol production from Eucalyptus plantation thinnings

详细信息	查看全文 | 推荐本文 |

• 作者：S. McIntosh^a ; T. Vancov^a ; ^b ; ^{tony.vancov@industry.nsw.gov.au} ; J. Palmer^a ; M. Spain^a
• 关键词：Cellic® ; Ctec 2 ; Enzyme saccharification ; Eucalyptus dunnii ; Ethanol fermentation ; Pretreatment
• 刊名：Bioresource Technology
• 出版年：2012
• 期刊代码：11_09608524
• 类别：ce
• 出版时间：April, 2012
• 卷：110
• 期：Complete
• 页码：264-272
• 文件大小：351 K

摘要

Conditions for optimal pretreatment of eucalypt (Eucalyptus dunnii) and spotted gum (Corymbia citriodora) forestry thinning residues for bioethanol production were empirically determined using a 3³ factorial design. Up to 161 mg/g xylose (93%theoretical) was achieved at moderate combined severity factors (CSF) of 1.0-1.6. At CSF > 2.0, xylose levels declined, owing to degradation. Moreover at high CSF, depolymerisation of cellulose was evident and corresponded to glucose (155 mg/g, 鈭?3%cellulose) recovery in prehydrolysate. Likewise, efficient saccharification with Cellic庐 CTec 2 cellulase correlated well with increasing process severity. The best condition yielded 74%of the theoretical conversion and was attained at the height of severity (CSF of 2.48). Saccharomyces cerevisiae efficiently fermented crude E. dunnii hydrolysate within 30 h, yielding 18 g/L ethanol, representing a glucose to ethanol conversion rate of 0.475 g/g (92%). Based on our findings, eucalyptus forest thinnings represent a potential feedstock option for the emerging Australian biofuel industry.