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Optimization and techno-economic assessment of high-solid fed-batch saccharification and ethanol fermentation by Scheffersomyces stipitis and Saccharomyces cerevisiae consortium

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  • Unrean, Pornkamol
  • Khajeeram, Sutamat

Abstract

In the present work, technological and economical potentials of sugarcane bagasse-to-ethanol process using Scheffersomyces stipitis/S. cerevisiae consortium were investigated. A fed-batch enzyme saccharification followed by fermentation (SHF) using optimized yeast consortium achieved a maximum ethanol titer of 60 g/L with ethanol yield exceeding 70% of theoretical. Techno-economic analysis was assessed using a fully integrated process flowsheeting model, showing the optimized fed-batch yeast co-culture as the most cost-effective configuration with the ethanol yield of 250 kg-ethanol/ton-bagasse. The minimal ethanol selling price was 26.7 baht/L-ethanol, closed to the current ethanol selling price from cassava-based process. Process sensitivity analyses revealed the potentials for further cost reduction up to 44% by reducing enzyme dosage and increasing ethanol titer. Hence, this study provides an economically viable prototype for high-titer lignocellulosic ethanol production using S. stipitis/S. cerevisiae consortium which may offer better economic value than starch-based process.

Suggested Citation

  • Unrean, Pornkamol & Khajeeram, Sutamat, 2016. "Optimization and techno-economic assessment of high-solid fed-batch saccharification and ethanol fermentation by Scheffersomyces stipitis and Saccharomyces cerevisiae consortium," Renewable Energy, Elsevier, vol. 99(C), pages 1062-1072.
    • Handle: RePEc:eee:renene:v:99:y:2016:i:c:p:1062-1072
    DOI: 10.1016/j.renene.2016.08.019
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    References listed on IDEAS

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    1. Geraili, A. & Sharma, P. & Romagnoli, J.A., 2014. "Technology analysis of integrated biorefineries through process simulation and hybrid optimization," Energy, Elsevier, vol. 73(C), pages 145-159.
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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. Unrean, Pornkamol & Lai Fui, Bridgid Chin & Rianawati, Elisabeth & Acda, Menandro, 2018. "Comparative techno-economic assessment and environmental impacts of rice husk-to-fuel conversion technologies," Energy, Elsevier, vol. 151(C), pages 581-593.
    3. Mesa, Leyanis & Martínez, Yenisleidy & Barrio, Edenny & González, Erenio, 2017. "Desirability function for optimization of Dilute Acid pretreatment of sugarcane straw for ethanol production and preliminary economic analysis based in three fermentation configurations," Applied Energy, Elsevier, vol. 198(C), pages 299-311.

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