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Fungal Pretreatments on Non-Sterile Solid Digestate to Enhance Methane Yield and the Sustainability of Anaerobic Digestion

Author

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  • Andrea Zanellati

    (Mycotheca Universitatis Taurinensis (MUT), Department of Life Sciences and Systems Biology, University of Turin, Viale Mattioli 25, 10125 Turin, Italy)

  • Federica Spina

    (Mycotheca Universitatis Taurinensis (MUT), Department of Life Sciences and Systems Biology, University of Turin, Viale Mattioli 25, 10125 Turin, Italy)

  • Luca Rollé

    (Department of Agriculture, Forestry and Food Science (DISAFA), Mechanics Section, University of Turin, Largo Paolo Braccini 2, 10095 Grugliasco, Italy)

  • Giovanna Cristina Varese

    (Mycotheca Universitatis Taurinensis (MUT), Department of Life Sciences and Systems Biology, University of Turin, Viale Mattioli 25, 10125 Turin, Italy)

  • Elio Dinuccio

    (Department of Agriculture, Forestry and Food Science (DISAFA), Mechanics Section, University of Turin, Largo Paolo Braccini 2, 10095 Grugliasco, Italy)

Abstract

Fungi can run feedstock pretreatment to improve the hydrolysis and utilization of recalcitrant lignocellulose-rich biomass during anaerobic digestion (AD). In this study, three fungal strains ( Coprinopsis cinerea MUT 6385, Cyclocybe aegerita MUT 5639, Cephalotrichum stemonitis MUT 6326) were inoculated in the non-sterile solid fraction of digestate, with the aim to further (re)use it as a feedstock for AD. The application of fungal pretreatments induced changes in the plant cell wall polymers, and different profiles were observed among strains. Significant increases ( p < 0.05) in the cumulative biogas and methane yields with respect to the untreated control were observed. The most effective pretreatment was carried out for 20 days with C. stemonitis , causing the highest hemicellulose, lignin, and cellulose reduction (59.3%, 9.6%, and 8.2%, respectively); the cumulative biogas and methane production showed a 182% and 214% increase, respectively, compared to the untreated control. The increase in AD yields was ascribable both to the addition of fungal biomass, which acted as an organic feedstock, and to the lignocellulose transformation due to fungal activity during pretreatments. The developed technologies have the potential to enhance the anaerobic degradability of solid digestate and untap its biogas potential for a further digestion step, thus allowing an improvement in the environmental and economic sustainability of the AD process and the better management of its by-products.

Suggested Citation

  • Andrea Zanellati & Federica Spina & Luca Rollé & Giovanna Cristina Varese & Elio Dinuccio, 2020. "Fungal Pretreatments on Non-Sterile Solid Digestate to Enhance Methane Yield and the Sustainability of Anaerobic Digestion," Sustainability, MDPI, vol. 12(20), pages 1-15, October.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:20:p:8549-:d:428867
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    1. Cristiane Romio & Michael Vedel Wegener Kofoed & Henrik Bjarne Møller, 2021. "Digestate Post-Treatment Strategies for Additional Biogas Recovery: A Review," Sustainability, MDPI, vol. 13(16), pages 1-27, August.
    2. Giulia Grisolia & Debora Fino & Umberto Lucia, 2022. "Biomethanation of Rice Straw: A Sustainable Perspective for the Valorisation of a Field Residue in the Energy Sector," Sustainability, MDPI, vol. 14(9), pages 1-22, May.

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