Urban parks and gardens green waste: A valuable resource for the production of fillers for biocomposites applications

Viretto Amandine, Gontard Nathalie, Angellier-Coussy Hélène. 2021. Urban parks and gardens green waste: A valuable resource for the production of fillers for biocomposites applications. Waste Management, 120 : 538-548.

Quartile : Q1, Sujet : ENGINEERING, ENVIRONMENTAL / Quartile : Q1, Sujet : ENVIRONMENTAL SCIENCES

Résumé : Urban parks and gardens green waste constitute a low-cost and highly available lignocellulosic-rich resource, that is currently treated in composting or anaerobic digestion processes. The present work investigated for the first time the potential of using urban green waste as raw resource for the production of lignocellulosic fillers by dry fractionation (combination of sorting and grinding processes). Five fractions of lignocellulosic fillers with controlled composition were produced: a branches-rich fraction, a grasses-rich fraction, a leaves-rich fraction, and two fractions constituted of a mixture of constituents. All the fractions were ground to reach an average median diameter around 100 μm. The reinforcing effect of each fraction was investigated and compared to that of the sample as a whole. Biocomposites based on a poly(3-hydroxybutyrate-co-3-hydroxyvalerate) as matrix were produced by melt extrusion, with filler contents up to 30 wt%. It was shown that the branches-rich fraction displayed the best reinforcing effect (e.g. stress at break of 37 ± 1 MPa for a filler content of 15 wt%, similar to that of the neat matrix) whereas the grasses-rich fraction slightly degraded the overall mechanical performance (e.g. stress at break of 33.5 ± 1.5 MPa for a filler content of 15 wt%). The dry fractionation and formulation steps could be thus adapted depending on the targeted application, e.g. by choosing to use the whole urban green waste resource, or to remove grasses, or to keep only branches.

Mots-clés Agrovoc : déchet organique, déchet urbain, biocomposite, urbanisation, compost

Mots-clés libres : Urban green waste, Dry fractionation, Lignocellulosic fillers, Biocomposites

Agences de financement européennes : European Commission

Programme de financement européen : H2020

Projets sur financement : (EU) REsources from URban BIo-waSte

Auteurs et affiliations

• Viretto Amandine, CIRAD-PERSYST-UPR BioWooEB (FRA)
• Gontard Nathalie, INRAE (FRA) - auteur correspondant
• Angellier-Coussy Hélène, INRAE (FRA) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/605195/)

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