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Techno-Economic Analysis of Integrating First and Second-Generation Ethanol Production Using Filamentous Fungi: An Industrial Case Study

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  • Karthik Rajendran

    (Swedish Centre for Resource Recovery, University of Borås, 50190 Borås, Sweden
    Department of Molecular Biosciences and Bioengineering, University of Hawai’i at Mānoa, Honolulu, HI 96822, USA)

  • Sreevathsava Rajoli

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

  • Mohammad J. Taherzadeh

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

Abstract

The 2nd generation plants producing ethanol from lignocelluloses demand risky and high investment costs. This paper presents the energy- and economical evaluations for integrating lignocellulose in current 1st generation dry mill ethanol processes, using filamentous fungi. Dry mills use grains and have mills, liquefactions, saccharifications, fermentation, and distillation to produce ethanol, while their stillage passes centrifugation, and evaporation to recycle the water and dry the cake and evaporated syrup into animal feed. In this work, a bioreactor was considered to cultivate fungi on the stillage either before or after the centrifugation step together with pretreated lignocellulosic wheat bran. The results showed that the integrated 1st and 2nd generation ethanol process requires a capital investment of 77 million USD, which could yield NPV of 162 million USD after 20 years. Compared to the fungal cultivation on thin stillage modified 1st generation process, the integrated process resulted in 53 million USD higher NPV. The energy analysis showed that the thin stillage modified 1st generation process could reduce the overall energy consumption by 2.5% and increase the ethanol production by 4%. Such modifications in the 1st generation processes and integration concepts could be interesting for the ethanol industries, as integrating lignocelluloses to their existing setup requires less capital investment.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:5:p:359-:d:69901
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    References listed on IDEAS

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    1. Chovau, Simon & Degrauwe, David & Van der Bruggen, Bart, 2013. "Critical analysis of techno-economic estimates for the production cost of lignocellulosic bio-ethanol," Renewable and Sustainable Energy Reviews, Elsevier, vol. 26(C), pages 307-321.
    2. Meyer, Pimphan A. & Tews, Iva J. & Magnuson, Jon K. & Karagiosis, Sue A. & Jones, Susanne B., 2013. "Techno-economic analysis of corn stover fungal fermentation to ethanol," Applied Energy, Elsevier, vol. 111(C), pages 657-668.
    3. 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.
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    Cited by:

    1. Troiano, D. & Orsat, V. & Dumont, M.J., 2020. "Status of filamentous fungi in integrated biorefineries," Renewable and Sustainable Energy Reviews, Elsevier, vol. 117(C).
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    3. 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.
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