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Energy Integration of Thermal Pretreatment in Anaerobic Digestion of Wheat Straw

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  • Alfonso García Álvaro

    (Department of Chemical Engineering and Environmental Technology, University of Valladolid (UVa), Campus Universitario Duques de Soria, 42004 Soria, Spain
    Institute of Sustainable Process, University of Valladolid (UVa), 47011 Valladolid, Spain)

  • César Ruiz Palomar

    (Department of Chemical Engineering and Environmental Technology, University of Valladolid (UVa), Campus Universitario Duques de Soria, 42004 Soria, Spain
    Institute of Sustainable Process, University of Valladolid (UVa), 47011 Valladolid, Spain)

  • Israel Díaz Villalobos

    (Institute of Sustainable Process, University of Valladolid (UVa), 47011 Valladolid, Spain
    Department of Chemical and Environmental Engineering, University of Valladolid (UVa), Dr. Mergelina s/n, 47011 Valladolid, Spain)

  • Daphne Hermosilla

    (Department of Forest and Environmental Engineering and Management, Universidad Politécnica de Madrid, José Antonio Novais 10, 28040 Madrid, Spain)

  • Raúl Muñoz

    (Institute of Sustainable Process, University of Valladolid (UVa), 47011 Valladolid, Spain
    Department of Chemical and Environmental Engineering, University of Valladolid (UVa), Dr. Mergelina s/n, 47011 Valladolid, Spain)

  • Ignacio de Godos

    (Department of Chemical Engineering and Environmental Technology, University of Valladolid (UVa), Campus Universitario Duques de Soria, 42004 Soria, Spain
    Institute of Sustainable Process, University of Valladolid (UVa), 47011 Valladolid, Spain)

Abstract

Cereal straw stands out as one of the most abundant and globally distributed agricultural residues. Traditional applications cope with a limited amount of production, leaving the remainder in the field for natural decomposition. Managing cereal straw through controlled biological transformation under anaerobic conditions holds the potential to generate added value in the form of bioenergy. However, the lignocellulosic composition of these substrates poses challenges for organic degradation, often requiring energy-intensive pretreatments. A detailed study with a comprehensive calculation of the overall energy balance of the integrated process is proposed, aiming to provide real added value and replicability. Three scenarios for wheat straw transformation were investigated, incorporating two preliminary pre-treatment stages—mechanical milling and physicochemical steam explosion. Three conditions of pretreatment were essayed, varying the time exposure of the steam explosion. The subsequent energy integration analysis revealed that the process was optimized by up to 15% in the final energy balance when the steam explosion was set to 10 min. The macromolecular composition determination revealed that the thermal pretreatment reduced the lag phase of the hydrolysis step through hemicellulose breakdown.

Suggested Citation

  • Alfonso García Álvaro & César Ruiz Palomar & Israel Díaz Villalobos & Daphne Hermosilla & Raúl Muñoz & Ignacio de Godos, 2024. "Energy Integration of Thermal Pretreatment in Anaerobic Digestion of Wheat Straw," Energies, MDPI, vol. 17(9), pages 1-14, April.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:9:p:2030-:d:1382579
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    References listed on IDEAS

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