Bioconversion of sawdust into ethanol using dilute sulfuric acid-assisted continuous twin screw-driven reactor pretreatment and fed-batch simultaneous saccharification and fermentation
- Authors
- Kim, Tae Hyun; Choi, Chang Ho; Oh, Kyeong Keun
- Issue Date
- Feb-2013
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Lignocellulose; Ethanol; Continuous pretreatment; Extrusion; Fed-batch SSF
- Citation
- BIORESOURCE TECHNOLOGY, v.130, pp.306 - 313
- Indexed
- SCIE
SCOPUS
- Journal Title
- BIORESOURCE TECHNOLOGY
- Volume
- 130
- Start Page
- 306
- End Page
- 313
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/28867
- DOI
- 10.1016/j.biortech.2012.11.125
- ISSN
- 0960-8524
- Abstract
- Ethanol production from poplar sawdust using sulfuric acid-assisted continuous twin screw-driven reactor (CTSR) pretreatment followed by simultaneous saccharification and fermentation (SSF) was investigated. Pretreatment with high acid concentration increased the cellulose content in the pretreated solid (74.9-76.9% in the range of 4.0-5.5 wt.% H2SO4). The sugar content (XMG; xylan + mannan + galactan) in the treated-solid was 11.1-15.2% and 0.9-5.7% with 0.5 wt.% and 7.0 wt.%, respectively. The XMG recovery yield of the sample treated with 4.0 wt.% H2SO4 at 185 degrees C was maximized at 88.6%. Enzymatic hydrolysis test showed a cellulose digestibility of 67.1%, 70.1%, and 73.6% with 15, 30, and 45 FPU/gcellulose, respectively. In the fed-batch SSF tests with initial enzyme addition, the ethanol yield of each stage almost reached a maximum at 28 h, 48 h, and 56 h, respectively, with yields of 63.9% (16.5 g/L), 78.4% (30.1 g/L), and 81.7% (39.9 g/L), respectively. (C) 2012 Elsevier Ltd. All rights reserved.
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