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Sustainable Use of Digestate from Biogas Plants: Separation of Raw Digestate and Liquid Fraction Processing

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  • Mateusz Nowak

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

  • Wojciech Czekała

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

Abstract

This review provides an overview of the various aspects involved in the digestate separation process with a focus on the best solution. The paper discusses the possibility of processing the liquid fraction using membrane separation processes and evaporation. Despite the identical goal of digestate separation, the solutions presented have many differences. These differences affect each process’s capital, operating costs, efficiency, and complexity. Among the selected solutions, the most popular technology for separating digestate is a screw press. Its advantage is the simplicity of its design compared to the centrifuges or filter presses used. In addition to the economic aspect, a definite advantage of mechanical separation is the possibility of using the liquid fraction to reduce the dry matter of the feedstock for biogas plants. Regardless of the chosen technology, striving for the closed-cycle operation of biogas plants and optimizing production processes is now becoming necessary. Proper management of the digestate is a crucial element of the operational efficiency of any biogas plant in case of the sustainable energy. The prepared article will fill some gaps in knowledge and indicate further directions of action. It is necessary to further develop research on methods of digestate separation.

Suggested Citation

  • Mateusz Nowak & Wojciech Czekała, 2024. "Sustainable Use of Digestate from Biogas Plants: Separation of Raw Digestate and Liquid Fraction Processing," Sustainability, MDPI, vol. 16(13), pages 1-16, June.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:13:p:5461-:d:1423455
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    References listed on IDEAS

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    1. Gurinder Kaur & Ronald Kander, 2023. "The Sustainability of Industrial Hemp: A Literature Review of Its Economic, Environmental, and Social Sustainability," Sustainability, MDPI, vol. 15(8), pages 1-15, April.
    2. Orlando Corigliano & Marco Iannuzzi & Crescenzo Pellegrino & Francesco D’Amico & Leonardo Pagnotta & Petronilla Fragiacomo, 2023. "Enhancing Energy Processes and Facilities Redesign in an Anaerobic Digestion Plant for Biomethane Production," Energies, MDPI, vol. 16(15), pages 1-29, August.
    3. Joanna Mikusińska & Monika Kuźnia & Klaudia Czerwińska & Małgorzata Wilk, 2023. "Hydrothermal Carbonization of Digestate Produced in the Biogas Production Process," Energies, MDPI, vol. 16(14), pages 1-18, July.
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