Abstract:
A landfill is one of the optimal solution for dumping municipal solid waste. Since the solid waste management and disposal in the study area were impropriate and unsecured. As a result, facing serious problems in the environment, Social, and economy on the community. The main objective of the present study was to select a suitable municipal solid waste disposal sites using GIS and multi-criteria decision analysis. The samples were collected from 193 households for 7 days from selected residential, commercial, institutional, public bin as well as street sweeping using a stratified and systematic random sampling technique. The present study was used primary and secondary data. The study carried out Onsite physical characterization and chemically characterized in the laboratory. The concentration of heavy metals was analyzed using atomic absorption spectrophotometer. This study adopted a system dynamic model to estimate the present and future quantity of municipal solid waste generation. In addition, GIS integrated with MCDA were adopted to analyze the relative weight of each criterion and overall suitability map and considered nine criteria within their respective constraints. The study result revealed that the SW generation rate of the town was 0.37 kg/cap/day within the range of urban towns of Ethiopia. Whereas, the total daily and annual production were 30.73, 11217.1 tone/year respectively. Besides, the study output showed that 18.6% were recyclable and 81.4% non-recyclable materials. The proximate analysis of the study showed the percentage of moisture contents, volatile matters content, ash content, and fixed carbon were 30%, 55.6%, 13.3%, and 1.1% respectively. And also, the pH was 7.5 and bulk density was 263.5 kg/m3. As the result showed that the Zn, Pb, Cu, Cd, Cr, and Fe content was 154.67, 58.50 172.50, 8.53, 13.70, and 215.33 mg/kg respectively. As outcome revealed that the total quantity of generation without recyclable was 84951.5 tone/year and the total area covered was 10.00275 ha /year at the design year of 2035. As the overall suitability analysis shows that four candidate sites were selected; accordingly, 7.9 % were unsuitable 33.9 %, less suitable 56.8 %, moderately suitable, and 1.3 % highly suitable for municipal solid waste disposal sites. Therefore, a highly suitable area of the landfill site was sufficient to the estimated total area required for the predicted quantity of municipal solid waste at the end of design year. In the perspective of health, economy, and environment a suitable landfill site was selected for Shire Town for the next 15 years. This study suggested that needs further study on detail design and analysis of disposal site selection in the study area.
