SELECTING SOLIDWASTE SITES USING INTEGRATED FUZZY LOGIC MODEL AND MULTI CRITERIA APPROACH IN SHASHEMENE TOWN: OROMIA REGIONAL STATE, ETHIOPIA

Solid waste is unwanted material generated from combined residential, industrial, and commercial activities in a given area. Since landfills are permanent sites, they need special attention in selecting the location by applying an efficient method. This study employed the Fuzzy logic in combination with Weighted Linear Combination (WLC) methods for the selection of solid waste landfill site in Shashemene town. Moreover, the study used multi-criteria decision-making integrated with Geographic Information System (GIS) to evaluate solid waste site. The results show that the most considerable factors in site selection are the distance from road, river, residential areas, and commercial areas with weights of 0.242, 0.194, 0.134, and 0.119 respectively. However, slope and height are not significant criteria. Overall, the final capability map generated by the weighted linear combination method represents 41.5% of the study area is not suitable for landfill setting, whereas low, moderate, high, and the most suitable classes cover 30.7%, 16.4%, 7.5 and 3.9% of Shashemene town, respectively. The study also identified three best (3) sites of 25.9ha, 205.19ha, and 268.75ha for the landfill in the town. Keywords: Analytical Hierarchy Process (AHP), Fuzzy logic, landfill site selection, multi-criteria, solid waste, Weighted Linear Combination (WLC)