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On the Optimization of Fermentation Conditions for Enhanced Bioethanol Yields from Starchy Biowaste via Yeast Co-Cultures

Author

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  • Mohamed Hashem

    (Department of Biology, College of Science, King Khalid University, Abha 61413, Saudi Arabia
    Botany and Microbiology Department, Faculty of Science, Assiut University, Assiut 71516, Egypt)

  • Saad A. Alamri

    (Department of Biology, College of Science, King Khalid University, Abha 61413, Saudi Arabia)

  • Tahani A. Y. Asseri

    (Department of Biology, College of Science, King Khalid University, Abha 61413, Saudi Arabia)

  • Yasser S. Mostafa

    (Department of Biology, College of Science, King Khalid University, Abha 61413, Saudi Arabia)

  • Gerasimos Lyberatos

    (Zografou Campus, School of Chemical Engineering, National Technical University of Athens, GR 15780 Athens, Greece
    Institute of Chemical Engineering Sciences, Foundation for Research and Technology, GR 26504 Patra, Greece)

  • Ioanna Ntaikou

    (Zografou Campus, School of Chemical Engineering, National Technical University of Athens, GR 15780 Athens, Greece
    Institute of Chemical Engineering Sciences, Foundation for Research and Technology, GR 26504 Patra, Greece)

Abstract

The present study aims to assess the impact of the type of yeast consortium used during bioethanol production from starchy biowastes and to determine the optimal fermentation conditions for enhanced bioethanol production. Three different yeast strains, Saccharomyces cerevisiae , Pichia barkeri, and Candida intermedia were used in mono- and co-cultures with pretreated waste-rice as substrate. The optimization of fermentation conditions i.e., fermentation time, temperature, pH, and inoculum size, was investigated in small-scale batch cultures and subsequently, the optimal conditions were applied for scaling-up and validation of the process in a 7-L fermenter. It was shown that co-culturing of yeasts either in couples or triples significantly enhanced the fermentation efficiency of the process, with ethanol yield reaching 167.80 ± 0.49 g/kg of biowaste during experiments in the fermenter.

Suggested Citation

  • Mohamed Hashem & Saad A. Alamri & Tahani A. Y. Asseri & Yasser S. Mostafa & Gerasimos Lyberatos & Ioanna Ntaikou, 2021. "On the Optimization of Fermentation Conditions for Enhanced Bioethanol Yields from Starchy Biowaste via Yeast Co-Cultures," Sustainability, MDPI, vol. 13(4), pages 1-13, February.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:4:p:1890-:d:496657
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    References listed on IDEAS

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    1. Rita H. R. Branco & Mariana S. T. Amândio & Luísa S. Serafim & Ana M. R. B. Xavier, 2020. "Ethanol Production from Hydrolyzed Kraft Pulp by Mono- and Co-Cultures of Yeasts: The Challenge of C6 and C5 Sugars Consumption," Energies, MDPI, vol. 13(3), pages 1-15, February.
    2. Chohan, Naseeha A. & Aruwajoye, G.S. & Sewsynker-Sukai, Y. & Gueguim Kana, E.B., 2020. "Valorisation of potato peel wastes for bioethanol production using simultaneous saccharification and fermentation: Process optimization and kinetic assessment," Renewable Energy, Elsevier, vol. 146(C), pages 1031-1040.
    3. Ben-Iwo, Juliet & Manovic, Vasilije & Longhurst, Philip, 2016. "Biomass resources and biofuels potential for the production of transportation fuels in Nigeria," Renewable and Sustainable Energy Reviews, Elsevier, vol. 63(C), pages 172-192.
    4. Aikaterini Konti & Dimitris Kekos & Diomi Mamma, 2020. "Life Cycle Analysis of the Bioethanol Production from Food Waste—A Review," Energies, MDPI, vol. 13(19), pages 1-14, October.
    5. Jambo, Siti Azmah & Abdulla, Rahmath & Marbawi, Hartinie & Gansau, Jualang Azlan, 2019. "Response surface optimization of bioethanol production from third generation feedstock - Eucheuma cottonii," Renewable Energy, Elsevier, vol. 132(C), pages 1-10.
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    Cited by:

    1. Ntaikou, I. & Alexandropoulou, M. & Kamilari, M. & Alamri, S.A. & Moustafa, Y.S. & Hashem, M. & Antonopoulou, G. & Lyberatos, G., 2023. "Saccharification of starchy food waste through thermochemical and enzymatic pretreatment, towards enhanced bioethanol production via newly isolated non-conventional yeast strains," Energy, Elsevier, vol. 281(C).
    2. Bitew, Dagnew & Alemu, Marye & Tesfaye, Anteneh & Andualem, Berhanu, 2024. "Ethanologenic yeasts from Ethiopian fermented beverages and optimization of fermentation conditions," Renewable and Sustainable Energy Reviews, Elsevier, vol. 190(PA).

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