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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/7079

Title: Multi objective node routing problem with time windows: an alternate approach to solid waste collection and disposal in developing countries
Authors: Otoo, Dominic
Issue Date: 15-Apr-2015
Abstract: This thesis is concerned with the collection and disposal of solid waste in the developing countries where logistics for collection and improper road network is a challenge. This problem is modeled as a Capacitated Node Routing Problem with Time Windows (CNRPTW), the effect of smell from uncollected waste on the environment and the cost of transportation to the disposal sites. The first part of the study investigates the generation of waste per person per day in third class communities; the second part provides a proposed location model to optimally assign customers unto a zone base d on two primary parameters. The third part of the study provides a meta-heuristic method, which takes into account the vehicle capacity and time of collection. This is based on the improved Ant Colony Heuristic, enhanced by three parameters. The introduction of soft windows incorporates vehicle breaking time, crew lunch break and drop-off time. The fourth part of the study modeled the effect of smell from uncollected waste by incorporating factors such time and fraction of biodegradable component, the fifth part considered the implementation of a proposed model on fuel consumption in addition to the existing fuel consumption models. Computational testing is carried out on the test problems used in the literature on our improved models gave competitive results. The final part of the study deals with the implementation of our models on the real life solid waste generation, collection and transportation which exists in one of the nine sub-metropolitan areas in Kumasi Metropolitan Assembly in Kumasi. Competing results were obtained compared with the existing practices on the ground.
Description: A thesis submitted to the Department of Mathematics, School of Sciences, Kwame Nkrumah University of Science and Technology in fulfillment of the requirement for the degree of Doctor of Philosophy in Mathematics, 2014
URI: http://hdl.handle.net/123456789/7079
Appears in Collections:College of Science

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