Risk Assessment of Urban Waste Management through EFMEA and TOPSIS Methods (Case Study: District ۶ of Tehran Municipality, Iran)

Background: We assessed and ranked environmental risks in the mechanized urban waste collection and storage systems in Tehran municipality (Iran) to locate safe areas for the establishment of these systems. Methods: This descriptive-analytical study first identified and classified the effective factors in locating the mechanized systems of the studied district in seven criteria (socioeconomic, physical-spatial, hydrological-climatic, geological, and three passive defenses including dispersion, lifeline, and high-risk facilities). Risk factors were evaluated using the FMEA technique and prioritized using the TOPSIS method. Results: The FMEA results classified the identified passive defense and environmental risks into three levels (high, medium, low), with ۶۹% of the risks at the low level, ۱۷% at the medium level, and ۱۴% at the high level. The TOPSIS ranking results identified "Distance to nearest fire station", "Distance to a fault" and "Distance to power substation" as the highest risk factors with the similarity to ideal solution (cli)values of ۰.۸۶۱, ۰.۷۷۴ and ۰.۷۷۱, respectively, as well as "Distance to gas pressure-reducing stations" (cli = ۰.۱۳۴) as the least important risk factor. Conclusion: New urban waste collection and storage stations in the studied district should be established according to the population of the areas and at a suitable distance to the nearest fire stations. Further, locating and designing these systems in wide open spaces is highly essential.

کلیدواژه ها:

Risk Assessment ، Waste Management ، Mechanized Collection System ، TOPSIS method ، FMEA technique ، ارزیابی ریسک ، مدیریت پسماند ، سیستم جمع آوری مکانیزه ، روش TOPSIS ، تکنیک FMEA