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Saccharification of starchy food waste through thermochemical and enzymatic pretreatment, towards enhanced bioethanol production via newly isolated non-conventional yeast strains

Author

Listed:
  • Ntaikou, I.
  • Alexandropoulou, M.
  • Kamilari, M.
  • Alamri, S.A.
  • Moustafa, Y.S.
  • Hashem, M.
  • Antonopoulou, G.
  • Lyberatos, G.

Abstract

A starchy food waste containing mainly cooked wasted rice (WR) was exploited for bioethanol production using novel yeast strains was investigated. Different pretreatment schemes of the waste at solids loading 10%–30% TS WR (w/v) i.e. enzymatic, thermochemical and combined thermochemical/enzymatic pretreatment, were evaluated aiming to the maximum liberation of fermentable carbohydrates and their subsequent bioconversion to ethanol. Fermentation tests of the whole pretreated slurries were initially performed with the yeasts strains that were identified as Kluyveromyces marxianus isolate V3-19,Pichia kudriavzevii strain YF1702 and K. marxianus strain TTG-428, and their fermentation efficiencies (FE) were comparatively assessed. It was shown that the combined pretreatment led to the maximum saccharification, whereas FEs were higher for K. marxianus, V3-19, exceeding 90% of the theoretical maximum. In the case of the highest organic loading of WR, though, up to 25% of soluble carbohydrates remained unexploitable after 72 h of fermentation, indicating that kinetic restrictions occurred in the process. Further experiments with the hydrolysates that were recovered after combined pretreatment, revealed that the removal of solids enhances the consumption of sugars and leads to complete uptake for the loading 20% TS WR (w/v).

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:281:y:2023:i:c:s0360544223016535
    DOI: 10.1016/j.energy.2023.128259
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    References listed on IDEAS

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    1. 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.
    2. Ben Atitallah, Imen & Ntaikou, Ioanna & Antonopoulou, Georgia & Alexandropoulou, Maria & Brysch-Herzberg, Michael & Nasri, Moncef & Lyberatos, Gerasimos & Mechichi, Tahar, 2020. "Evaluation of the non-conventional yeast strain Wickerhamomyces anomalus (Pichia anomala) X19 for enhanced bioethanol production using date palm sap as renewable feedstock," Renewable Energy, Elsevier, vol. 154(C), pages 71-81.
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