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Enhancing Bioenergy Yields from Sequential Bioethanol and Biomethane Production by Means of Solid–Liquid Separation of the Substrates

Author

Listed:
  • Lisandra Rocha-Meneses

    (Institute of Technology, Chair of Biosystems Engineering, Estonian University of Life Sciences, Kreutzwaldi 56, 51006 Tartu, Estonia)

  • Jorge A Ferreira

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

  • Nemailla Bonturi

    (Institute of Technology, ERA Chair in Synthetic Biology, University of Tartu, Nooruse 1, 50411 Tartu, Estonia)

  • Kaja Orupõld

    (Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51006 Tartu, Estonia; Kaja.Orupold.emu.ee)

  • Timo Kikas

    (Institute of Technology, Chair of Biosystems Engineering, Estonian University of Life Sciences, Kreutzwaldi 56, 51006 Tartu, Estonia)

Abstract

The production of second-generation ethanol using lignocellulosic feedstock is crucial in order to be able to meet the increasing fuel demands by the transportation sector. However, the technology still needs to overcome several bottlenecks before feasible commercialization can be realized. These include, for example, the development of cost-effective and environmentally friendly pretreatment strategies and valorization of the sidestream that is obtained following ethanol distillation. This work uses two chemical-free pretreatment methods—nitrogen explosive decompression (NED) and synthetic flue gas explosive decompression—to investigate the potential of a bioethanol production sidestream in terms of further anaerobic digestion. For this purpose, samples from different stages of the bioethanol production process (pretreatment, hydrolysis, and fermentation) and the bioethanol sidestream went through a separation process (involving solid–liquid separation), following which a biomethane potential (BMP) assay was carried out. The results show that both factors being studied in this article (involving the pretreatment method and the separation process) served to influence methane yields. Liquid fractions that were obtained during the process with NED gave rise to methane yields that were 8% to 12% higher than when synthetic flue gas was used; fermented and distillation sidestream gave rise to the highest methane yields (0.53 and 0.58 mol CH4/100 g respectively). The methane yields from the liquid fractions were between 60–88% lower than those that were obtained from solid fractions. Samples from the bioethanol sidestream (solid fraction) that were pretreated with NED had the highest methane yield (1.7 mol CH 4 /100 g). A solid–liquid separation step can be a promising strategy when it comes to improving the energy output from lignocellulosic biomass and the management of the ethanol distillation sidestream.

Suggested Citation

  • Lisandra Rocha-Meneses & Jorge A Ferreira & Nemailla Bonturi & Kaja Orupõld & Timo Kikas, 2019. "Enhancing Bioenergy Yields from Sequential Bioethanol and Biomethane Production by Means of Solid–Liquid Separation of the Substrates," Energies, MDPI, vol. 12(19), pages 1-16, September.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:19:p:3683-:d:271003
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    References listed on IDEAS

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    1. Naik, S.N. & Goud, Vaibhav V. & Rout, Prasant K. & Dalai, Ajay K., 2010. "Production of first and second generation biofuels: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(2), pages 578-597, February.
    2. Merlin Raud & Vahur Rooni & Timo Kikas, 2018. "The Efficiency of Nitrogen and Flue Gas as Operating Gases in Explosive Decompression Pretreatment," Energies, MDPI, vol. 11(8), pages 1-12, August.
    3. Rocha-Meneses, Lisandra & Raud, Merlin & Orupõld, Kaja & Kikas, Timo, 2019. "Potential of bioethanol production waste for methane recovery," Energy, Elsevier, vol. 173(C), pages 133-139.
    4. Raud, M. & Krennhuber, K. & Jäger, A. & Kikas, T., 2019. "Nitrogen explosive decompression pre-treatment: An alternative to steam explosion," Energy, Elsevier, vol. 177(C), pages 175-182.
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    Cited by:

    1. Chen, Jiaxin & Zhang, Biying & Luo, Lingli & Zhang, Fan & Yi, Yanglei & Shan, Yuanyuan & Liu, Bianfang & Zhou, Yuan & Wang, Xin & Lü, Xin, 2021. "A review on recycling techniques for bioethanol production from lignocellulosic biomass," Renewable and Sustainable Energy Reviews, Elsevier, vol. 149(C).
    2. Lisandra Rocha-Meneses & Oghenetejiri Frances Otor & Nemailla Bonturi & Kaja Orupõld & Timo Kikas, 2019. "Bioenergy Yields from Sequential Bioethanol and Biomethane Production: An Optimized Process Flow," Sustainability, MDPI, vol. 12(1), pages 1-19, December.
    3. Ó Céileachair, Dónal & O'Shea, Richard & Murphy, Jerry D. & Wall, David M., 2021. "Alternative energy management strategies for large industry in non-gas-grid regions using on-farm biomethane," Applied Energy, Elsevier, vol. 303(C).
    4. Nikki Sjulander & Timo Kikas, 2022. "Two-Step Pretreatment of Lignocellulosic Biomass for High-Sugar Recovery from the Structural Plant Polymers Cellulose and Hemicellulose," Energies, MDPI, vol. 15(23), pages 1-18, November.

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