Optimal Planning of Door-to-Door Multiple Materials Separated Waste Collection

Separated collection is an important part of waste management, because it allows material recovery. In order to organize separate collection operations, complex decisions need to be taken on the basis of a large amount of data. In this paper, the problem of planning the door-to-door waste collection of multiple materials for a municipality is considered. A few contributions are available in the literature for this problem. A new mixed integer linear programming model is formalized and solved. A multiobjective optimization model is proposed, aiming at minimizing both operational costs and possible inefficiencies of the recycling logistic system causing negative environmental impacts. The model is applied to a real case study and a mixed integer programming heuristic algorithm is used for its solution. The obtained results are discussed and conclusions are drawn.