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Short ozonation for effective removal and detoxification of fermentation inhibitors resulting from thermal pretreatment

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  • Rosen, Yan
  • Maslennikov, Alona
  • Trabelcy, Beny
  • Gerchman, Yoram
  • Mamane, Hadas

Abstract

Common pretreatment methods for bioethanol production from lignocellulosic biomass are carried out under acidic conditions at high temperatures and result in formation of by-products, such as formic acid, levulinic acid, furfural and HMF (5-hydroxymethylfurfural). These by-products have an inhibitory effect on yeasts, reducing yeast growth and fermentation, and thus ethanol production. In this study, the inhibitory dose of these by-products was investigated along with the use of short ozonation as a means of their detoxification. When the effect of ozone was tested directly on yeasts (without inhibitors), they exhibited tolerance to ozone, suggesting the utilization of ozonation in simultaneous saccharification and fermentation. Fifteen minutes of ozonation removed over 90% of the inhibitory effect originating from 50 mM furfural, 50 mM formic acid, 25 mM HMF, and 100 mM levulinic acid. Thermal pretreatment and enzymatic hydrolysis of pine sawdust resulted in inhibition of microaerobic yeast growth. This inhibition was relieved after short ozonation; however, continuous ozonation has motivated further inhibition, suggesting the formation of additional inhibitory compounds. The results demonstrate the applicability of short ozonation as a practical approach for removing by-products’ inhibitory effects originating from thermal pretreatment of lignocellulosic waste.

Suggested Citation

  • Rosen, Yan & Maslennikov, Alona & Trabelcy, Beny & Gerchman, Yoram & Mamane, Hadas, 2022. "Short ozonation for effective removal and detoxification of fermentation inhibitors resulting from thermal pretreatment," Renewable Energy, Elsevier, vol. 189(C), pages 1407-1418.
    • Handle: RePEc:eee:renene:v:189:y:2022:i:c:p:1407-1418
    DOI: 10.1016/j.renene.2022.03.065
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    References listed on IDEAS

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    1. Rosen, Yan & Mamane, Hadas & Gerchman, Yoram, 2021. "Immersed ozonation of agro-wastes as an effective pretreatment method in bioethanol production," Renewable Energy, Elsevier, vol. 174(C), pages 382-390.
    2. Nikki Sjulander & Timo Kikas, 2020. "Origin, Impact and Control of Lignocellulosic Inhibitors in Bioethanol Production—A Review," Energies, MDPI, vol. 13(18), pages 1-20, September.
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    Cited by:

    1. Antonio Manuel Pérez-Merchán & Gabriela Rodríguez-Carballo & Benjamín Torres-Olea & Cristina García-Sancho & Pedro Jesús Maireles-Torres & Josefa Mérida-Robles & Ramón Moreno-Tost, 2022. "Recent Advances in Mechanochemical Pretreatment of Lignocellulosic Biomass," Energies, MDPI, vol. 15(16), pages 1-34, August.

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