Site Selection of Reduce, Reuse, Recycle-Based Solid Waste Processing Facility (3RSWPF) in Singaraja Peri-Urban Area Using Analytical Hierarchy Process (AHP)

Abstract

The growth of the population has led to an increase in solid waste on a daily basis, particularly in urban areas. The urban area of Singaraja is encountering difficulties in waste management due to the excessive amount of untreated waste surpassing the capacity of processing facilities. Employing the Reduce, Reuse, Recycle Based Solid Waste Processing Facility (3RSWPF) can diminish the volume of waste at the source. However, regional regulations prevented the facility from being constructed directly in the urban area. Therefore, the peri-urban area was deemed appropriate for 3RSWPF. Conducting a site suitability analysis was necessary to identify the most ideal locations for 3RSWPF. This study employed the Geographic Information System (GIS) analysis, paired with Analytical Hierarchy Process (AHP) to determine seven suitability criteria. A pairwise comparison matrix was used to determine the weights of each criterion. These criteria include flood-prone areas with an analysis weight of 23.8%, followed by land use/land cover (LULC) type at 21.1%, proximity to road at 13.3%, road classification at 11.2%, building density at 10.9%, proximity to settlement at 10.3% and population at 9.4%. The AHP model revealed a consistency ratio (CR) of 3.2%, providing evidence of the model’s validity and reliability. Based on the criteria’s weights, a 3RSWPF suitability map was created using weighted overlay. Utilizing field validation method, this study found 52 suitable locations for 3RSWPF, distributed in 8 villages. The study results provide a spatial insight regarding the necessity of municipal solid waste facilities.