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TiO2 supported natural zeolites as biogas enhancers through photocatalytic pre-treatment of Miscanthus x giganteous crops

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  • Tedesco, S.
  • Hurst, G.
  • Imtiaz, A.
  • Ratova, M.
  • Tosheva, L.
  • Kelly, P.

Abstract

Miscanthus giganteous is probably the most fast growing and low nutrient bioenergy crop among lignocellulosic feedstocks. Despite its significant content in fermentable sugars, currently Miscanthus biomass is not used for biogas/methane production due to the high-lignin and low moisture content in the winter/spring harvest as well as cellulose crystallinity, which limit access to enzymatic action for all lignocellulosic feedstock. This study identified that a photocatalytic pretreatment prior to anaerobic digestion helps increase the substrate’s biodegradability by oxidising the lignin fraction, leading to increased methane yield up to 46% compared to the untreated. A novel photocatalyst was manufactured by reactive magnetron-sputtering deposition of TiO2 particles onto natural zeolite supports, which provided important trace elements for the anaerobic digestion process and retained a large surface area that acted as biofilm to boost growth of the microbial community. A load of 2% w/w catalyst in the bioreactor after 3 h of photocatalytic treatment led to 220 mLN gVS−1, with a net energy balance that is achieved for the whole process when treating the dispersed phase suspension at concentrations above 10 g m−3.

Suggested Citation

  • Tedesco, S. & Hurst, G. & Imtiaz, A. & Ratova, M. & Tosheva, L. & Kelly, P., 2020. "TiO2 supported natural zeolites as biogas enhancers through photocatalytic pre-treatment of Miscanthus x giganteous crops," Energy, Elsevier, vol. 205(C).
    • Handle: RePEc:eee:energy:v:205:y:2020:i:c:s0360544220310616
    DOI: 10.1016/j.energy.2020.117954
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    References listed on IDEAS

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    1. Tedesco, S. & Daniels, S., 2018. "Optimisation of biogas generation from brown seaweed residues: Compositional and geographical parameters affecting the viability of a biorefinery concept," Applied Energy, Elsevier, vol. 228(C), pages 712-723.
    2. Tedesco, S. & Daniels, S., 2019. "Evaluation of inoculum acclimatation and biochemical seasonal variation for the production of renewable gaseous fuel from biorefined Laminaria sp. waste streams," Renewable Energy, Elsevier, vol. 139(C), pages 1-8.
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    Cited by:

    1. Ma, Shuaishuai & Li, Yuling & Li, Jingxue & Yu, Xiaona & Cui, Zongjun & Yuan, Xufeng & Zhu, Wanbin & Wang, Hongliang, 2022. "Features of single and combined technologies for lignocellulose pretreatment to enhance biomethane production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 165(C).
    2. Hurst, George & Ahmed, Ash & Taylor, Steven & Tedesco, Silvia, 2023. "Anaerobic digestion of recycled paper crumb and effects of digestate on concrete performance," Renewable Energy, Elsevier, vol. 208(C), pages 577-582.

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