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Agronomic Evaluation of Recycled Polyurethane Foam-Based Growing Media for Green Roofs

Author

Listed:
  • Patrice Cannavo

    (Institut Agro, EPHOR, 49000 Angers, France)

  • Mathieu Artous

    (Institut Agro, EPHOR, 49000 Angers, France)

  • Olivier Lemmel

    (Brangeon Recyclage, 49300 Cholet, France)

  • Hervé Buord

    (Jaulin Paysages, Chemin des Gruellières, 44470 Carquefou, France)

  • Laure Vidal-Beaudet

    (Institut Agro, EPHOR, 49000 Angers, France)

  • René Guénon

    (Institut Agro, EPHOR, 49000 Angers, France)

Abstract

Green roofs are very popular and their individual surface area is constantly growing. Considering that the organo-mineral materials used in planting growing media (GM) are often non-renewable resources, the search for alternative materials from waste recycling is a challenge. Among these, recycled polyurethane (PU) foams are light and porous. The objective of this study was to evaluate the potential agronomic valorisation of PU foams for extensive green roofs. Three GM based on compost, PU foam and topsoil were developed and tested in situ for 18 months along with four plant species in containers containing 15 cm of GM. The agronomic properties of the GM and their contaminant contents were evaluated, as well as the plant aerial and root biomasses and trace element levels. The main results of this work are that GM are suitable for plant growth. Compost ratio effect resulted in a lower pH and higher exchangeable cations in GM1, whereas topsoil proportion effect mainly decreased macroporosity and increased nutrient contents. Furthermore, due to the high trace element load in the compost, hyperaccumulator plants such as Hypericum calycinum and Stipa tenuissima should be preferred. Ecotoxicological analyses will be carried out to validate the absence of risk of PU foam contaminants being released in the environment before proposing these types of GM to green roof developers.

Suggested Citation

  • Patrice Cannavo & Mathieu Artous & Olivier Lemmel & Hervé Buord & Laure Vidal-Beaudet & René Guénon, 2022. "Agronomic Evaluation of Recycled Polyurethane Foam-Based Growing Media for Green Roofs," Sustainability, MDPI, vol. 14(20), pages 1-19, October.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:20:p:13679-:d:949957
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    References listed on IDEAS

    as
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    3. Lê, Sébastien & Josse, Julie & Husson, François, 2008. "FactoMineR: An R Package for Multivariate Analysis," Journal of Statistical Software, Foundation for Open Access Statistics, vol. 25(i01).
    4. Stefano Cascone, 2019. "Green Roof Design: State of the Art on Technology and Materials," Sustainability, MDPI, vol. 11(11), pages 1-27, May.
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