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Production of Ethanol and Biomass from Thin Stillage Using Food-Grade Zygomycetes and Ascomycetes Filamentous Fungi

Author

Listed:
  • Jorge A. Ferreira

    (Swedish Centre for Resource Recovery, University of Borås, Borås SE-50190, Sweden)

  • Patrik R. Lennartsson

    (Swedish Centre for Resource Recovery, University of Borås, Borås SE-50190, Sweden)

  • Mohammad J. Taherzadeh

    (Swedish Centre for Resource Recovery, University of Borås, Borås SE-50190, Sweden)

Abstract

A starch-based ethanol facility producing 200,000 m 3 ethanol/year also produces ca. 2 million m 3 thin stillage, which can be used to improve the entire process. In this work, five food-grade filamentous fungi, including a Zygomycete and four Ascomycetes were successfully grown in thin stillage containing 9% solids. Cultivation with Neurospora intermedia led to the production of ca. 16 g·L −1 biomass containing 56% (w/w) crude protein, a reduction of 34% of the total solids, and 5 g·L −1 additional ethanol. In an industrial ethanol production process (200,000 m 3 ethanol/year), this can potentially lead to the production of 11,000 m 3 extra ethanol per year. Cultivation with Aspergillus oryzae resulted in 19 g·L −1 biomass containing 48% (w/w) crude protein and the highest reduction of the thin stillage glycerol (54%) among the Ascomycetes . Cultivation with Rhizopus sp . produced up to 15 g·L −1 biomass containing 55% (w/w) crude protein. The spent thin stillage had been reduced up to 85%, 68% and 21% regarding lactic acid, glycerol and total solids, respectively. Therefore, N. intermedia , in particular, has a high potential to improve the ethanol process via production of additional ethanol and high-quality biomass, which can be considered for animal feed applications such as for fish feed.

Suggested Citation

  • Jorge A. Ferreira & Patrik R. Lennartsson & Mohammad J. Taherzadeh, 2014. "Production of Ethanol and Biomass from Thin Stillage Using Food-Grade Zygomycetes and Ascomycetes Filamentous Fungi," Energies, MDPI, vol. 7(6), pages 1-14, June.
    • Handle: RePEc:gam:jeners:v:7:y:2014:i:6:p:3872-3885:d:37309
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    References listed on IDEAS

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    1. Sarkar, Nibedita & Ghosh, Sumanta Kumar & Bannerjee, Satarupa & Aikat, Kaustav, 2012. "Bioethanol production from agricultural wastes: An overview," Renewable Energy, Elsevier, vol. 37(1), pages 19-27.
    2. ,, 2000. "Problems And Solutions," Econometric Theory, Cambridge University Press, vol. 16(2), pages 287-299, April.
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    1. Karthik Rajendran & Sreevathsava Rajoli & Mohammad J. Taherzadeh, 2016. "Techno-Economic Analysis of Integrating First and Second-Generation Ethanol Production Using Filamentous Fungi: An Industrial Case Study," Energies, MDPI, vol. 9(5), pages 1-13, May.
    2. Troiano, D. & Orsat, V. & Dumont, M.J., 2020. "Status of filamentous fungi in integrated biorefineries," Renewable and Sustainable Energy Reviews, Elsevier, vol. 117(C).
    3. Rodica Niculescu & Adrian Clenci & Victor Iorga-Siman, 2019. "Review on the Use of Diesel–Biodiesel–Alcohol Blends in Compression Ignition Engines," Energies, MDPI, vol. 12(7), pages 1-41, March.
    4. Sajjad Karimi & Nasrollah Mahboobi Soofiani & Amir Mahboubi & Mohammad J. Taherzadeh, 2018. "Use of Organic Wastes and Industrial By-Products to Produce Filamentous Fungi with Potential as Aqua-Feed Ingredients," Sustainability, MDPI, vol. 10(9), pages 1-19, September.
    5. Rahul Thunuguntla & Amir Mahboubi & Jorge A. Ferreira & Mohammad J. Taherzadeh, 2018. "Integration of Membrane Bioreactors with Edible Filamentous Fungi for Valorization of Expired Milk," Sustainability, MDPI, vol. 10(6), pages 1-16, June.

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