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Microwave Assisted Alkaline Pretreatment of Algae Waste in the Production of Cellulosic Bioethanol

Author

Listed:
  • Rocío Maceiras

    (Centro Universitario de la Defensa, Escuela Naval Militar, Plaza de España s/n, 36920 Marín, Spain)

  • Víctor Alfonsín

    (Centro Universitario de la Defensa, Escuela Naval Militar, Plaza de España s/n, 36920 Marín, Spain)

  • Luis Seguí

    (Escuela Naval Militar, Plaza de España s/n, 36920 Marín, Spain)

  • Juan F. González

    (Department of Applied Physics, School of Industrial Engineering, University of Extremadura, 06006 Badajoz, Spain)

Abstract

Biomass pretreatment has an important role in the production of cellulosic bioethanol. In this study, the effectiveness of microwave assisted alkaline pretreatment of algae waste was analysed. After pretreatment, the product was hydrolysed using sulphuric acid. The effects of microwave power, irradiating time, solid–liquid ratio and NaOH concentration were examined. Under the best conditions, the fermentable sugars were converted to cellulosic bioethanol using Saccharomyces Cerevisiae with a bioethanol yield of 1.93 ± 0.01 g/g and a fermentation efficiency of 40.4%. The reducing sugars concentration was 30% higher than that obtained from conventional hydrolysis without pretreatment. The obtained results suggest that microwave assisted alkaline pretreatment is effective in improving the production of cellulosic bioethanol of algae waste compared to that without microwave effect. Considering energy consumption, low microwave power and short microwave irradiation time are favourable for this pretreatment.

Suggested Citation

  • Rocío Maceiras & Víctor Alfonsín & Luis Seguí & Juan F. González, 2021. "Microwave Assisted Alkaline Pretreatment of Algae Waste in the Production of Cellulosic Bioethanol," Energies, MDPI, vol. 14(18), pages 1-10, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:18:p:5891-:d:637511
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    References listed on IDEAS

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    1. Mata, Teresa M. & Martins, António A. & Caetano, Nidia. S., 2010. "Microalgae for biodiesel production and other applications: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(1), pages 217-232, January.
    2. Lior, Noam, 2008. "Energy resources and use: The present situation and possible paths to the future," Energy, Elsevier, vol. 33(6), pages 842-857.
    3. Sudhakar, K. & Mamat, R. & Samykano, M. & Azmi, W.H. & Ishak, W.F.W. & Yusaf, Talal, 2018. "An overview of marine macroalgae as bioresource," Renewable and Sustainable Energy Reviews, Elsevier, vol. 91(C), pages 165-179.
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