بهبود برنامه ريزي جمع آوري پسماندهاي شهري در ابعاد واقعي (مطالعه موردي: شهر تهران)

A MATHEMATICAL MODEL AND SOLUTION METHOD TO ENHANCE \tr THE URBAN WASTE COLLECTION PROCESS IN TEHRAN

This paper describes a heuristic method, which consists of three algorithms to solve the vehicle routing prob¬lem for overnight collection of solid waste generated in residential areas. Operational costs, e.g. labor, fuel and maintenance costs can be optimized, if the total distance traversed by the vehicles is minimized. In addition, the air pollution generated by the used trucks will be re¬duced. First, the PILP model of the problem is defined; then, considering numerous variables and constraints involved in real size problems and many practical limitations, such as calling close and one way streets, which are diffi¬cult to include in classic models, we proposed a practical solution method. The solution method consists of three algorithms: Zoning Algorithm, Route Generating Algo¬rithm and Combination Algorithm. The experimental results on a real problem, one of the Tehran districts, showed the superiority of the solution method to the solution generated and used by human experts.