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Cassava Waste Pulp Valorization for Biohydrogen Production: A Sustainable Approach to Advancing Circular Economy

Author

Listed:
  • Bonn Jeno Rojo

    (University of Science and Technology of Southern Philippines)

  • Zarah Pagaran

    (University of Science and Technology of Southern Philippines)

  • Ma. Carmela Derecho

    (University of Science and Technology of Southern Philippines)

  • Mary Joy Dedi

    (University of Science and Technology of Southern Philippines)

  • Alexander Ido

    (University of Science and Technology of Southern Philippines)

  • Renato Arazo

    (University of Science and Technology of Southern Philippines)

Abstract

In response to the escalating issue of atmospheric emissions from fossil fuels, harnessing biofuel-based renewable energy is considered a highly promising energy option. Biohydrogen, being carbon-free and non-polluting, has gained significant attention. This study investigated the potential of cassava waste pulp (CWP) as a substrate for biohydrogen production through photofermentation, using Rhodopseudomonas palustris as the inoculum. An acid-hydrolyzed substrate with a sugar concentration of 10.2°Brix was produced via 1% hydrochloric acid hydrolysis pretreatment and used in the experiment. The optimum values for the operating variables of hydraulic retention time (HRT) and inoculation volume ratio (IVR) were assessed under controlled conditions, with a constant pH of 8.0, light intensity of 720 lx (120 W), and an ambient room temperature of 25 ± 3 °C. The results showed that the highest biogas yield was achieved with a 60 h HRT and a 30% IVR. The central composite design of the response surface methodology revealed that the model was highly significant, with a p-value of

Suggested Citation

  • Bonn Jeno Rojo & Zarah Pagaran & Ma. Carmela Derecho & Mary Joy Dedi & Alexander Ido & Renato Arazo, 2025. "Cassava Waste Pulp Valorization for Biohydrogen Production: A Sustainable Approach to Advancing Circular Economy," Circular Economy and Sustainability, Springer, vol. 5(2), pages 1003-1022, April.
    • Handle: RePEc:spr:circec:v:5:y:2025:i:2:d:10.1007_s43615-024-00431-0
    DOI: 10.1007/s43615-024-00431-0
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    References listed on IDEAS

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    1. Niño-Navarro, C. & Chairez, I. & Christen, P. & Canul-Chan, M. & García-Peña, E.I., 2020. "Enhanced hydrogen production by a sequential dark and photo fermentation process: Effects of initial feedstock composition, dilution and microbial population," Renewable Energy, Elsevier, vol. 147(P1), pages 924-936.
    2. Varinder Jain, 2019. "Fossil Fuels, GHG Emissions and Clean Energy Development: Asian Giants in a Comparative Perspective," Millennial Asia, , vol. 10(1), pages 1-24, April.
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