Journal
BIORESOURCE TECHNOLOGY
Volume 250, Issue -, Pages 102-109Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.11.029
Keywords
Cellulosic bioethanol; Sulfite pretreatment; Monterey pine; Undetoxified; Whole slurry SSF
Funding
- Hong Kong General Research Fund - Early Career Scheme [25201114]
- Guangdong-Hong Kong jointed innovation program [2014B050505019]
- Sinopec Chemical Commercial Holding Company Limited
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The economic feasibility of high-concentration cellulosic bioethanol production remains challenging because it requires easily available feedstock and low energy consumption process. Simultaneous saccharification and fermentation (SSF) of sulfite pretreated Momentary pine slurry at 20% (w/w) loadings increased ethanol concentration from 59.3 g/L to 68.5 g/L by washing strategy. Effects of inhibitors in pretreatment liquor were further investigated. Besides HMF, furfural and acetic acid, other inhibitors and/or their synergistic effects proved to be responsible for a lower fermentability. To bypass the inhibition and achieve high-efficient bioethanol concentration, a fermentation temperature of 28 degrees C was optimized for both cell growth and ethanol production. Under the optimal conditions with prehydrolyzed 25% (w/w) whole undetoxified slurry, a high ethanol concentration (up to 82.1 g/L) were produced with a yield of 205 kg/ton Monterey pine in the SSF. Thus, this high cellulosic bioethanol production from Monterey pine makes it a potential strategy for biofuel production.
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