a new mathematical model for designing a municipal solid waste system considering environmentally issues

Nowadays, produced wastes in urban areas are growing exponentially all over the world. moreover, the environment and natural resources are on the way to destruction. one way to deal with increasing waste generation and protecting the environment is proper management of municipal solid wastes. one aspect of municipal solid waste management is locating the various facilities and the routing between them. in this study, a new mathematical model is developed for the location-routing problem in mswm system. the integrity of mswm facilities is the focus of this study. the proposed model meets two objectives including minimization of system costs and environmental impacts. in this model, the location of waste collection centers and reverse logistics centers are determined. in order to improve the efficiency and practicality of the proposed model, a solution method based on the nsga-ii is proposed. also, a new method based on best-worst approach was developed to parameter tuning of nsga-ii. as a result, it was observed that the total costs of the system increases exponentially as a result of increase in the volume of waste in sources. numeral experiments indicate the efficiency of the proposed algorithm in achieving approximate optimum solution in an acceptable time.