Caractérisation avancée et valorisation des plastiques mélangés postconsommation : étude de cas chez Gaudreau Environnement inc

Authors: Jacob-Vaillancourt, Colin
Advisor: Galvez, RosaSorelli, Luca
Abstract: According to recent estimates, only 32% of all postconsumer plastics are collected by curbside collection programs in the province of Quebec (CANADA), and an even smaller amount may be actually recycled into new products. Recycling has nonetheless been identified as one of the key strategies needed to enable a transition to a fully circular economy for plastics. At this time, a lack of precise data, transferable between all stakeholders of the plastics value chain, prevents the implementation of efficient measures to upgrade the quality of plastics channelled towards thermomechanical recycling. Also, very few recycling techniques are designed for heterogeneous plastic streams, while an increasingly varied array of plastic packaging is found on the consumer market. This research aimed to study the quality of a mixed plastics stream produced by Gaudreau Environnement Inc.’s material recovery facility, and develop a recycling technique able to process an heterogeneous plastic stream. A combination of industrial machineries and laboratory analyses was used to characterize the quality of the mixed plastics, and a quality index was generated to estimate the concentration of a targeted polymer in a sorted plastic stream. A characterization of contaminants showed that polystyrene and polyvinyl chloride streams experienced more variation in terms of quality for recycling. A potential valorization route was investigated, where recycled plastic aggregates were substituted to sand in experimental concrete blends. Plastic aggregates helped confer greater elastic toughness and a higher thermal resistance to concrete. Plastic aggregates with a high bulk density, such as those derived from PVC, generated concretes with the best mechanical performances. This recycling technique seems promising for heterogeneous plastic streams, particularly when several polymers are present, since its quality parameters differ from conventional thermomechanical recycling.
Document Type: Mémoire de maîtrise
Issue Date: 2018
Open Access Date: 24 April 2018
Grantor: Université Laval
Collection:Thèses et mémoires

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