Evaluation of Karaj Solid Waste Landfill with Regional and Local Screening Method

In regarding to the adverse impacts of solid waste landfilling in improper places, selection of proper sites according to the criteria and rules has great importance. In this study Karaj solid waste landfill is evaluated with regional and local screening method. For evaluating this site in regional scale 22 km radius from the center of Karaj city was selected. Then regional criteria including distance from surface water, distance from residential centers, water ground depth, geology, etc were studied with producing different layers in geographical information system. In order to inspect these criteria in regional studies; maps were produced from related organizations and centers. After production of basic maps in order to product the final suitability map in regional scale according to the pattern, layers were reclassified with three proper, average and improper class. In the end, final reclassified map was produced. According to this map the mensuration of improper sites is 142915/8 hectare, the mensuration of average sites is 5089/3 hectare and the mensuration of improper sites is 4046/9 hectare and also the landfill suitability is evaluated as improper. For evaluating needed land for studied solid waste landfill, factors like population growth rate, the amount of yearly solid waste, shape and height of the landfill were studied and the mensuration of the site was evaluated as improper. Then the landfill was studied in local scale and the criteria like soil depth, natural land cover of the site and landscape of the site, etc were studied with weight and point method and its suitability was evaluated as average