Dépôt numérique

Physical process to sort construction and demolition waste (C&DW) fines components using process water.

Taillard, Vincent, Mercier, Guy, Pasquier, Louis-César ORCID: https://orcid.org/0000-0002-7155-3257, Blais, Jean-François ORCID: https://orcid.org/0000-0003-3087-4318 et Martel, Richard ORCID: https://orcid.org/0000-0003-4219-5582 (2022). Physical process to sort construction and demolition waste (C&DW) fines components using process water. Waste Management , vol. 143 . p. 125-134. DOI: 10.1016/j.wasman.2022.02.012.

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Modern societies are generating considerable volume of Construction and Demolition Wastes (C&DW) annually. Most recycling facilities offers viable sorting and recycling options for the coarser particles of the different materials found in those wastes. However, usual dry mechanical sorting and human sorting are not efficient on C&DW fines particles (C&DF, <10 mm) representing the third of the C&DW produced and being composed of similar materials. Recent environmental issues related to the landfilling of C&DF have pointed out the need to develop innovative alternative and adapted recycling paths for the C&DF. This study presents an efficient sorting process train based on physical separation steps used in the mining and the soil treatment industries. The use and recirculation of process water allowed to segregate and concentrate the gypsum from the 2–12 mm C&DF into a specific fraction (55–65% gypsum content) representing 40% of the total mass. Other constituents were sorted based on their relative density, size and shapes; thanks to hydraulic classification and physical sorting forming four more fractions with high recycling potential: coarse aggregates (15%), fine aggregates (9.4%), organic and inorganic fibers (10.8%) and light organic compounds (24.8%). The process has been designed to be integrated in existing sorting facilities and the process costs were evaluated to 38 CAN$/t.

Type de document: Article
Mots-clés libres: construction and demolition (C&amp;D); fines; sorting process; physical sorting; gypsum; recycling
Centre: Centre Eau Terre Environnement
Date de dépôt: 23 juin 2022 15:03
Dernière modification: 23 juin 2022 15:03
URI: https://espace.inrs.ca/id/eprint/12666

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