Abstract
Article history: Received June 25, 2015 Received in revised format: June 28, 2015 Accepted August 20, 2015 Available online August 25 2015 Waste collection is an important municipal service that charges large expenditures to waste management (WM) system. In this study, a hierarchical structure is proposed in order to minimize total cost of waste collection routing problem. Moreover, in second stage destructive environmental effects of waste transportation are minimized concurrently through taking advantage of a road/rail transportation system. In the proposed multimodal transportation system, waste packs are transferred to final destination while travel time and risk of environmental threatening is minimized. The discussed problem is formulated mathematically in two stages. In the first stage, a household waste collection routing problem is formulated while, in second stage a multimodal transportation system is routed to transfer waste packs to final destination through roads and railroads. In order to solve the proposed NP hard models, an improved genetic algorithm is developed. Comparison of the obtained results with those of GAMS for small-size samples validates the proposed models. Growing Science Ltd. All rights reserved. 6 © 201
Highlights
In a supply chain, transportation system connects different components of any system
Comparison of results shows that genetic algorithm has about 4%-10% diversification from GAMS results based on which authors claim that the solution approach is an efficient method to solve the models
In order to importance of waste management (WM), cooperating the Vehicle Routing Problem (VRP) and WM has been attracted by researchers
Summary
Transportation system connects different components of any system. By considering the inevitability of waste production in everyday life and their destructive effect on the environment, along with other threats to people health, associate governors and executive managers are required to route vehicles optimally in order to reduce 1) required time for waste collection operations, and 2) traffic. Implementing a multimodal transportation system enables transporting wastes through different types of routes by reduction of undesirable impacts on environment and health. Reusability of some types of solid wastes causes using them as raw materials for some industries This fact is considered in this study and after separating and packing solid wastes in disposal sites, they are delivered to a manufacturer as final destination.
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