A multi-depot vehicle-routing model for the explosive waste recycling
针对爆炸物废物回收中的车辆路径问题，提出了一个多车场模型，同时优化总成本和总风险，并设计了往返行程，通过中国南川案例验证了模型的有效性。
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.