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Solid Fraction of Digestate from Biogas Plant as a Material for Pellets Production

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  • Wojciech Czekała

    (Department of Biosystems Engineering, Poznań University of Life Sciences, Wojska Polskiego 50, 60-627 Poznań, Poland)

Abstract

One of the anaerobic digestion process products in an agricultural biogas plant is digestate (digested pulp). Large quantities of digestate generated in the process of biogas production all over the world require proper management. Fertilization is the main management of this substrate, so it is essential to look for new alternatives. The work aims to determine and discuss the possibilities of using digestate solid fraction (DSF) for pellets as biofuel production. Pellets from DSF alone and pellets with sawdust, grain straw additives were analyzed. The lower heating value (LHV) based on the dry matter for all analyzed pellets ranged from 19,164 kJ∙kg −1 to 19,879 kJ∙kg −1 . The ash content was similar for all four samples and ranged from 3.62% to 5.23%. This value is relatively high, which is related to the degree of fermentation in the anaerobic digestion process. The results showed that the DSF substrate after the anaerobic digestion process still has energy potential. Analyzing those results, it seems that DSF can be a highly valuable substrate for solid biofuels production.

Suggested Citation

  • Wojciech Czekała, 2021. "Solid Fraction of Digestate from Biogas Plant as a Material for Pellets Production," Energies, MDPI, vol. 14(16), pages 1-8, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:16:p:5034-:d:615663
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    References listed on IDEAS

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    1. Ríos-Badrán, Inés M. & Luzardo-Ocampo, Iván & García-Trejo, Juan Fernando & Santos-Cruz, José & Gutiérrez-Antonio, Claudia, 2020. "Production and characterization of fuel pellets from rice husk and wheat straw," Renewable Energy, Elsevier, vol. 145(C), pages 500-507.
    2. Czekała, Wojciech & Bartnikowska, Sylwia & Dach, Jacek & Janczak, Damian & Smurzyńska, Anna & Kozłowski, Kamil & Bugała, Artur & Lewicki, Andrzej & Cieślik, Marta & Typańska, Dorota & Mazurkiewicz, Ja, 2018. "The energy value and economic efficiency of solid biofuels produced from digestate and sawdust," Energy, Elsevier, vol. 159(C), pages 1118-1122.
    3. Peng, Jianghong & Bi, Xiaotao T. & Lim, C. Jim & Peng, Hanchao & Kim, Chang Soo & Jia, Dening & Zuo, Haibin, 2015. "Sawdust as an effective binder for making torrefied pellets," Applied Energy, Elsevier, vol. 157(C), pages 491-498.
    4. Dach, J. & Koszela, K. & Boniecki, P. & Zaborowicz, M. & Lewicki, A. & Czekała, W. & Skwarcz, J. & Qiao, Wei & Piekarska-Boniecka, H. & Białobrzewski, I., 2016. "The use of neural modelling to estimate the methane production from slurry fermentation processes," Renewable and Sustainable Energy Reviews, Elsevier, vol. 56(C), pages 603-610.
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