Developing a Cl recovery process for PVC wastes under the guideline of ex-ante life cycle assessment

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Abstract

<p>Ex-ante life cycle assessment (LCA) is an emerging strategy to guide the development of technologies on laboratory scale for a better environmental performance. This case study focused on a chlorine (Cl) circulation system by Cl recovery from Poly (vinyl chloride) (PVC) wastes. PVC production is the biggest consumer of Cl while most of Cl contained in PVC wastes is unrecycled by current waste treatments. Moreover, undesired Cl compounds are intractable issues during the thermal treatment of PVC wastes. Thus, authors suggested a Cl recovery process for PVC wastes to realize a sustainable Cl cycle. First, the environmental impacts of PVC waste treatment in Japan were determined as a benchmark for evaluation. Next, an LCA model containing variables (de-Cl degree and efficiency parameter) for Cl recovery process was established based on experiments and chemical principles. Practical values of variables were investigated by the de-Cl experiments using real PVC wastes in an up-scale ball mill reactor. With discrete element model simulation, it was found that the impact energy of ball milling has significant influence on the de-Cl efficiency. Finally, a high de-Cl degree and low environmental impacts of the process was achieved under high impact energy and NaOH concentration.</p>

Journal

  • Proceedings of the Annual Conference of Japan Society of Material Cycles and Waste Management

    Proceedings of the Annual Conference of Japan Society of Material Cycles and Waste Management 30(0), 539, 2019

    Japan Society of Material Cycles and Waste Management

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