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ABSTRACT
Solid waste management is a world environmental challenge in the urban areas, due to the increase in the numbers of migrants which in turn leads to increase in the quantity of municipal solid waste generation and more difficulty of locating suitable land areas to be used as landfills. The problem of environmental pollution caused by waste disposal can be resolved by selecting suitable locations for their proper disposal with the least possible adverse effect on the environment and humans. Waste disposal in the Benin-city which is the study area of this research, is mainly by open space dumping which has the potential to contaminate both surface and groundwater and other environmental hazards in and around these open dumps. This research combined Multi Criteria Approach and Geographic Information System (GIS), in the selection of a landfill site in the study. The locations should meet both the economic and environmental requirements of a landfill site. The factors considered include land use, surface water bodies and distance to roads. The rest are railway line, settlements/residential area, geology and slope. The use of GIS was a vital tool for the preparation of multi criteria map layers. Analytical Hierarchy Process (AHP) model was used for pairwise comparison of all criteria and relative weights of importance were generated. All the criteria were standardized to a common scale before combining them. All the criteria were combined using weighted overlay analysis tools in ArcGIS with their corresponding weights of importance. The resultant suitability index map showed areas that are suitable for siting of a landfill based on all the input criteria
