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Wool Agro-Waste Biomass and Spruce Sawdust: Pellets as an Organic Soil Amendment

Author

Listed:
  • Aldo Dal Prà

    (Institute of Bioeconomy (IBE), National Research Council, 50145 Florence, Italy)

  • Francesca Ugolini

    (Institute of Bioeconomy (IBE), National Research Council, 50145 Florence, Italy)

  • Martino Negri

    (Institute of Bioeconomy (IBE), National Research Council, 50145 Florence, Italy)

  • Sara Bortolu

    (Institute of Bioeconomy (IBE), National Research Council, 50145 Florence, Italy)

  • Pierpaolo Duce

    (Institute of Bioeconomy (IBE), National Research Council, 50145 Florence, Italy)

  • Cristina Macci

    (Research Institute on Terrestrial Ecosystems (IRET), National Research Council, Via Moruzzi 1, 56124 Pisa, Italy)

  • Andrea Lombardo

    (Istituto Zooprofilattico Sperimentale del Lazio e Della Toscana “M. Aleandri”, Via Castelpulci 43, 50018 Florence, Italy)

  • Martina Benedetti

    (Istituto Zooprofilattico Sperimentale del Lazio e Della Toscana “M. Aleandri”, Via Castelpulci 43, 50018 Florence, Italy)

  • Giovanni Brajon

    (Istituto Zooprofilattico Sperimentale del Lazio e Della Toscana “M. Aleandri”, Via Castelpulci 43, 50018 Florence, Italy)

  • Lucia Guazzini

    (Istituto Zooprofilattico Sperimentale del Lazio e Della Toscana “M. Aleandri”, Via Castelpulci 43, 50018 Florence, Italy)

  • Stefano Casini

    (Istituto Zooprofilattico Sperimentale del Lazio e Della Toscana “M. Aleandri”, Via Castelpulci 43, 50018 Florence, Italy)

  • Sara Spagnul

    (Istituto Zooprofilattico Sperimentale del Lazio e Della Toscana “M. Aleandri”, Via Castelpulci 43, 50018 Florence, Italy)

  • Francesca Camilli

    (Institute of Bioeconomy (IBE), National Research Council, 50145 Florence, Italy)

Abstract

The production of wool is an economic burden and an issue for sheep breeders in many countries of the European Union because shorn greasy wool is defined as an animal byproduct (category 3) and must be sent to landfill as a special waste if not addressed in the textile supply chain. Nevertheless, wool is an important source of nitrogen, with high potential as agricultural renewable and sustainable organic fertilizer. To apply wool to soil, any contamination from harmful bacteria (e.g., Listeria monocytogenes and Salmonella spp.) should be excluded. In this study, we developed sheep wool pellets to test their suitability for use as an organic fertilizer. Wool was rich in N (12% of dry material) and was mixed to spruce sawdust at sawdust: wool ratios of at 2:1; 1:1 ( v / v ) to increase soil organic carbon. Despite the different mix of wool and sawdust, pellets were similar in size (diameter and length), and the content of the elements suited the requirements of fertilizers and did not present harmful bacteria after pelletization. Therefore, wool pellets may represent a feasible solution to provide sheep wool with an added value, introducing it in a circular economy process. However, further study is needed to test the effects of the produced fertilizing pellets in real cropping systems.

Suggested Citation

  • Aldo Dal Prà & Francesca Ugolini & Martino Negri & Sara Bortolu & Pierpaolo Duce & Cristina Macci & Andrea Lombardo & Martina Benedetti & Giovanni Brajon & Lucia Guazzini & Stefano Casini & Sara Spagn, 2024. "Wool Agro-Waste Biomass and Spruce Sawdust: Pellets as an Organic Soil Amendment," Sustainability, MDPI, vol. 16(6), pages 1-14, March.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:6:p:2228-:d:1352668
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    References listed on IDEAS

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    2. Samuelsson, Robert & Larsson, Sylvia H. & Thyrel, Mikael & Lestander, Torbjörn A., 2012. "Moisture content and storage time influence the binding mechanisms in biofuel wood pellets," Applied Energy, Elsevier, vol. 99(C), pages 109-115.
    3. Montanarella, Luca & Panagos, Panos, 2021. "The relevance of sustainable soil management within the European Green Deal," Land Use Policy, Elsevier, vol. 100(C).
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