Site Selection of Construction Waste Landfill Based on Combination of Fuzzy AHP and Geospatial Information System (GIS) (Case Study: Qazvin, Iran)

Today, with the increasing urban development, construction waste is a major problem for urban life. The city of Qazvin is no exception to this, and researching an optimum landfill site is an important necessity. The purpose of this research is to optimum site selection areas for landfill of Construction wastes using the geographic information system (GIS) in a boundary area of Qazvin county which taking into account the terms and conditions of organizations such as the Municipality, Waste Management and Environmental Protection Organization. In this study, 16 layers of information including geology, soil type and permeability, Landuse, climate, river distance, distance from protected areas, aspect, etc. in the boundary of Qazvin county were used. After producing the preliminary maps, the sub-criteria of each information layer are classified and evaluated and the values are converted to fuzzy values between zero and one. Then, Fuzzy Hierarchical Process (FAHP) method have been used to determine the absolute weight of each information layer and by integrating and overlapping weighted layers, to the landfill suitability map of construction landfill for Qazvin city is produced. According to the suitability map, sites for landfill were identified in five distinct zones and high-lying areas of the fifth zone (with value 9) were suggested as the best landfill site for a 40-year period. The results showed that northwest of Qazvin due to good soil type, suitable land use, distance from rivers, faults and access to communication road and dry climate could be the most suitable site for landfill.