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Ethanol Production from High Solid Loading of Rice Straw by Simultaneous Saccharification and Fermentation in a Non-Conventional Reactor

Author

Listed:
  • Inês C. Roberto

    (Departamento de Biotecnologia, Escola de Engenharia de Lorena, Universidade de São Paulo, Lorena/SP 12602-810, Brazil)

  • Rafael C. A. Castro

    (Departamento de Biotecnologia, Escola de Engenharia de Lorena, Universidade de São Paulo, Lorena/SP 12602-810, Brazil)

  • João Paulo A. Silva

    (Departamento de Engenharia Química, Escola de Engenharia de Lorena, Universidade de São Paulo, Lorena/SP 12602-810, Brazil)

  • Solange I. Mussatto

    (Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Kemitorvet, Building 220, 2800 Kongens Lyngby, Denmark)

Abstract

Simultaneous saccharification and fermentation (SSF) at high solid loading is a potential approach to improve the economic feasibility of cellulosic ethanol. In this study, SSF using high loading of rice straw was assessed using a vertical ball mill reactor. First, the conditions of temperature and number of glass spheres were optimized at 8% ( w / v ) initial solids (41.5 °C, 18 spheres). Then, assays were carried out at higher solid loadings (16% and 24% w / v ). At 8% or 16% solids, the fermentation efficiency was similar (η F ~75%), but the ethanol volumetric productivity (Q P ) reduced from 1.50 to 1.14 g/L.h. By increasing the solids to 24%, the process was strongly affected (η F = 40% and Q P = 0.7 g/L.h). To overcome this drawback, three different feeding profiles of 24% pre-treated rice straw were investigated. Gradual feeding of the substrate (initial load of 16% with additions of 4% at 10 and 24 h) and an inoculum level of 3 g/L resulted in a high ethanol titer (52.3 g/L) with Q P of 1.1 g/L.h and η F of 67%. These findings demonstrated that using a suitable fed-batch feeding strategy helps to overcome the limitations of SSF in batch mode caused by the use of high solid content.

Suggested Citation

  • Inês C. Roberto & Rafael C. A. Castro & João Paulo A. Silva & Solange I. Mussatto, 2020. "Ethanol Production from High Solid Loading of Rice Straw by Simultaneous Saccharification and Fermentation in a Non-Conventional Reactor," Energies, MDPI, vol. 13(8), pages 1-17, April.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:8:p:2090-:d:348768
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    References listed on IDEAS

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    1. Castro, Rafael Cunha de Assis & Mussatto, Solange I. & Roberto, Inês Conceição, 2017. "A vertical ball mill as a new reactor design for biomass hydrolysis and fermentation process," Renewable Energy, Elsevier, vol. 114(PB), pages 775-780.
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    Cited by:

    1. Mussatto, Solange I. & Yamakawa, Celina K. & van der Maas, Lucas & Dragone, Giuliano, 2021. "New trends in bioprocesses for lignocellulosic biomass and CO2 utilization," Renewable and Sustainable Energy Reviews, Elsevier, vol. 152(C).
    2. Sanjeev Kumar Soni & Apurav Sharma & Raman Soni, 2023. "Microbial Enzyme Systems in the Production of Second Generation Bioethanol," Sustainability, MDPI, vol. 15(4), pages 1-26, February.
    3. Sharma, Sumit & Swain, Manas R. & Mishra, Abhishek & Mathur, Anshu S. & Gupta, Ravi P. & Puri, Suresh K. & Ramakumar, S.S.V. & Sharma, Ajay K., 2021. "High solid loading and multiple-fed simultaneous saccharification and co-fermentation (mf-SSCF) of rice straw for high titer ethanol production at low cost," Renewable Energy, Elsevier, vol. 179(C), pages 1915-1924.
    4. Pandey, Ajay Kumar & Kumar, Mohit & Kumari, Sonam & Gaur, Naseem A., 2022. "Integration of acid pre-treated paddy straw hydrolysate to molasses as a diluent enhances ethanol production using a robust Saccharomyces cerevisiae NGY10 strain," Renewable Energy, Elsevier, vol. 186(C), pages 790-801.

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