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Microwave-assisted sequential green liquor-inorganic salt pretreatment for enhanced sugar recovery from sorghum leaves towards bioethanol and biohydrogen production

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  • Naidoo, Joab C.
  • Moodley, Preshanthan
  • Sanusi, Isaac A.
  • Sewsynker-Sukai, Y.
  • Meyer, Edson L.
  • Gueguim Kana, Evariste

Abstract

A two-stage green liquor-inorganic salt pretreatment was developed to enhance sugar recovery from sorghum leaves (SL) for biofuel production. Process inputs included green liquor (GL) concentration, MgCl2 concentration and microwave power intensity. A coefficient of determination (R2) of 0.86 was achieved with optimal conditions of 31% (v/v) GL, 1.46 M MgCl2 and 600 W resulting in fermentable sugar yield of 0.719 g/g. This was followed by simultaneous saccharification and bioethanol production using the pretreated SL giving rise to maximum bioethanol concentration of 12.16 g/L. Thereafter, bioethanol fermentation effluent was channelled towards biohydrogen production and a peak H2 fraction of 31.85% (78.44 ml H2/g sugar) was obtained. These findings demonstrate the sequential valorisation of SL, GL, and bioethanol fermentation effluent towards a sustainable, cost effective and eco-friendly lignocellulosic biorefinery concept.

Suggested Citation

  • Naidoo, Joab C. & Moodley, Preshanthan & Sanusi, Isaac A. & Sewsynker-Sukai, Y. & Meyer, Edson L. & Gueguim Kana, Evariste, 2024. "Microwave-assisted sequential green liquor-inorganic salt pretreatment for enhanced sugar recovery from sorghum leaves towards bioethanol and biohydrogen production," Renewable Energy, Elsevier, vol. 225(C).
    • Handle: RePEc:eee:renene:v:225:y:2024:i:c:s0960148124002908
    DOI: 10.1016/j.renene.2024.120225
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    References listed on IDEAS

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    1. Kumari, Dolly & Singh, Radhika, 2018. "Pretreatment of lignocellulosic wastes for biofuel production: A critical review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 90(C), pages 877-891.
    2. Day, Creina & Day, Garth, 2017. "Climate change, fossil fuel prices and depletion: The rationale for a falling export tax," Economic Modelling, Elsevier, vol. 63(C), pages 153-160.
    3. Pham, Huong Thi Thu & Nghiem, Nhuan P. & Kim, Tae Hyun, 2018. "Near theoretical saccharification of sweet sorghum bagasse using simulated green liquor pretreatment and enzymatic hydrolysis," Energy, Elsevier, vol. 157(C), pages 894-903.
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    1. Adrian Woźniak & Ksawery Kuligowski & Lesław Świerczek & Adam Cenian, 2025. "Review of Lignocellulosic Biomass Pretreatment Using Physical, Thermal and Chemical Methods for Higher Yields in Bioethanol Production," Sustainability, MDPI, vol. 17(1), pages 1-33, January.
    2. Lin, Haitao & Zhang, Mohang & Chauhan, Bhupendra Singh & Ayed, Hamdi & Khadimallah, Mohamed Amine & Tang, Xiaodong & Mahariq, Ibrahim, 2024. "Development, kinetic analysis, and economic feasibility of different Corn Stover-driven biorefineries to produce biohydrogen, bioethanol, and biomethane: A comparative analysis," Renewable Energy, Elsevier, vol. 237(PA).

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