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High efficient ethanol production from corn stover by modified mild alkaline pretreatment

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  • Molaverdi, Maryam
  • Karimi, Keikhosro
  • Mirmohamadsadeghi, Safoora
  • Galbe, Mats

Abstract

Sodium carbonate pretreatment, an environmentally-friendly and efficient pretreatment, was used to improve solid-state ethanol production from corn stover (CS). To further enhance ethanol yield from the pretreated CS, especially at low enzyme loadings, a combined pretreatment, including steam and sodium carbonate pretreatments, was developed. The removal/modification of lignin by sodium carbonate pretreatment (at 100 °C for 3 h) helped to obtain high ethanol titer at high solids and low enzymes loadings. The maximum ethanol concentration was about 44 g/L, obtained after 72 h simultaneous saccharification and fermentation (SSF) of CS pretreated with sodium carbonate without mixing and prehydrolysis at 30% solid and 15 FPU/g enzyme loadings. Applying prehydrolysis and increasing the SSF time to 120 h improved ethanol concentration to 59 and 67 g/L, respectively. Steam pretreatment at 190 °C for 10 min before sodium carbonate pretreatment led to 76% increase in ethanol concentration. At the enzyme loading of only 5 FPU/g substrate, the modified pretreatment increased the ethanol concentration from 24 g/L to 41 g/L, compared with that of sodium carbonate pretreatment. The results showed that hemicellulose removal and delignification by steam and sodium carbonate pretreatment, respectively, considerably improved ethanol concentration at high solids and low enzyme loadings.

Suggested Citation

  • Molaverdi, Maryam & Karimi, Keikhosro & Mirmohamadsadeghi, Safoora & Galbe, Mats, 2021. "High efficient ethanol production from corn stover by modified mild alkaline pretreatment," Renewable Energy, Elsevier, vol. 170(C), pages 714-723.
    • Handle: RePEc:eee:renene:v:170:y:2021:i:c:p:714-723
    DOI: 10.1016/j.renene.2021.02.002
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    Citations

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    Cited by:

    1. He, Dingping & Chen, Xueli & Lu, Minsheng & Shi, Suan & Cao, Limin & Yu, Haitao & Lin, Hao & Jia, Xiwen & Han, Lujia & Xiao, Weihua, 2023. "High-solids saccharification and fermentation of ball-milled corn stover enabling high titer bioethanol production," Renewable Energy, Elsevier, vol. 202(C), pages 336-346.
    2. Fan, Meishan & Lei, Ming & Xie, Jun & Zhang, Hongdan, 2022. "Further insights into the solubilization and surface modification of lignin on enzymatic hydrolysis and ethanol production," Renewable Energy, Elsevier, vol. 186(C), pages 646-655.
    3. Borujeni, Nasim Espah & Alavijeh, Masih Karimi & Denayer, Joeri F.M. & Karimi, Keikhosro, 2023. "A novel integrated biorefinery approach for apple pomace valorization with significant socioeconomic benefits," Renewable Energy, Elsevier, vol. 208(C), pages 275-286.
    4. Aghili Mehrizi, Amirreza & Tangestaninejad, Shahram & Denayer, Joeri F.M. & Karimi, Keikhosro & Shafiei, Marzieh, 2023. "The critical impacts of anion and cosolvent on morpholinium ionic liquid pretreatment for efficient renewable energy production from triticale straw," Renewable Energy, Elsevier, vol. 202(C), pages 686-698.

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