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Article

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

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Mycotheca Universitatis Taurinensis (MUT), Department of Life Sciences and Systems Biology, University of Turin, Viale Mattioli 25, 10125 Turin, Italy
2
Department of Agriculture, Forestry and Food Science (DISAFA), Mechanics Section, University of Turin, Largo Paolo Braccini 2, 10095 Grugliasco, Italy
*
Authors to whom correspondence should be addressed.
Sustainability 2020, 12(20), 8549; https://doi.org/10.3390/su12208549
Received: 2 September 2020 / Revised: 9 October 2020 / Accepted: 12 October 2020 / Published: 15 October 2020
(This article belongs to the Collection Biodiversity 2020: Agriculture, Environment and Wellbeing)
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. View Full-Text
Keywords: digestate; solid fractions (SFDs); lignocellulose; pretreatment; fungi; biogas digestate; solid fractions (SFDs); lignocellulose; pretreatment; fungi; biogas
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MDPI and ACS Style

Zanellati, A.; Spina, F.; Rollé, L.; Varese, G.C.; Dinuccio, E. Fungal Pretreatments on Non-Sterile Solid Digestate to Enhance Methane Yield and the Sustainability of Anaerobic Digestion. Sustainability 2020, 12, 8549. https://doi.org/10.3390/su12208549

AMA Style

Zanellati A, Spina F, Rollé L, Varese GC, Dinuccio E. Fungal Pretreatments on Non-Sterile Solid Digestate to Enhance Methane Yield and the Sustainability of Anaerobic Digestion. Sustainability. 2020; 12(20):8549. https://doi.org/10.3390/su12208549

Chicago/Turabian Style

Zanellati, Andrea, Federica Spina, Luca Rollé, Giovanna C. Varese, and Elio Dinuccio. 2020. "Fungal Pretreatments on Non-Sterile Solid Digestate to Enhance Methane Yield and the Sustainability of Anaerobic Digestion" Sustainability 12, no. 20: 8549. https://doi.org/10.3390/su12208549

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