<p>In the aftermath of a pandemic, there has been a substantial increase in the generation of infectious medical waste. This necessitates the design of effective reverse logistics supply chains to control virus transmission and promotes a sustainable waste management system. This paper focuses on optimizing the joint decisions on the location and transportation of infectious medical waste in the presence of hierarchical relations and sustainability during a pandemic. The problem is developed as a bi-level optimization model to maximize total job opportunities and minimize total costs at the first level, and minimize total infection risks at the second level. To address this complex problem, a combination of KKT conditions, the augmented ε-constraint approach, and Pareto optimization is employed. A real case from Wuhan is applied to illustrate the formulated model. The results demonstrate that the augmented ε-constraint approach significantly outperforms conventional version and linear weighted sum method in tackling the intricate issue. To establish sustainable reverse logistics supply chains for infectious medical waste, a cross-regional transportation strategy for temporary transfer points and a differentiation strategy for the establishment of disposal centers are encouraged during a pandemic. The formulated model shows potential advantages in handling uncertainties in infectious medical waste location and transportation decision-making while accommodating managers’ varying preference for multiple objectives in the context of a pandemic.</p>

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Location and transportation joint decisions for infectious medical waste in sustainable supply chains during a pandemic: a bi-level optimization approach

  • Cejun Cao,
  • Jiahui Liu,
  • Weihua Liu,
  • Mabel C. Chou,
  • Fanshun Zhang,
  • Yi Zhang

摘要

In the aftermath of a pandemic, there has been a substantial increase in the generation of infectious medical waste. This necessitates the design of effective reverse logistics supply chains to control virus transmission and promotes a sustainable waste management system. This paper focuses on optimizing the joint decisions on the location and transportation of infectious medical waste in the presence of hierarchical relations and sustainability during a pandemic. The problem is developed as a bi-level optimization model to maximize total job opportunities and minimize total costs at the first level, and minimize total infection risks at the second level. To address this complex problem, a combination of KKT conditions, the augmented ε-constraint approach, and Pareto optimization is employed. A real case from Wuhan is applied to illustrate the formulated model. The results demonstrate that the augmented ε-constraint approach significantly outperforms conventional version and linear weighted sum method in tackling the intricate issue. To establish sustainable reverse logistics supply chains for infectious medical waste, a cross-regional transportation strategy for temporary transfer points and a differentiation strategy for the establishment of disposal centers are encouraged during a pandemic. The formulated model shows potential advantages in handling uncertainties in infectious medical waste location and transportation decision-making while accommodating managers’ varying preference for multiple objectives in the context of a pandemic.