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The explosive waste recycling is a significant concern because it has immense impacts on economy and safety during its transportation among multiple depots. A number of studies on the hazardous waste management have been documented in the past. However, the vehicle-routing optimisation, including the tour planning, the vehicle acquisition and the return-trip design of such activities, has been overlooked. In this study, we develop a multi-depot vehicle-routing model with the minimisations of total cost and total risk. Unlike other works in the literature, this model is formulated through the two-commodity flow formulation, and it is characterised by simultaneously planning tours and vehicle acquisitions for the explosive waste collection, and designing the return-trips between collection centres and recycling centres. To solve this bi-objective problem, a modified lexicographic weighted Tchebycheff method is proposed. A case study in Nanchuan of South-west China and related test instances are provided to elucidate the developed approach.
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Zhao et al. (2015) studied this question.
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