Abstract

Wastewater treatment systems are among the most critical infrastructure for urban development, with a fundamental role in maintaining public health and hygiene. They are also considered as secondary sources for some specific uses. Any disruption in their performance due to any type of incident will have adverse environmental, economic, and health impacts. The aim of the study is to analyze the risk of different sections of a wastewater treatment system located in one of the regions of Iran and propose mitigation strategies to reduce the adverse effects of any threat. To achieve this goal, the types of potential threats are determined based on American Society of Civil Engineers (ASCE-2004) guidelines, and then calculated the Risk Priority Number (RPN) for each section of the plant using the Federal Emergency Management Agency’s (FEMA-452) guidelines. Then, risk mitigation strategies for each section based on the study area’s situation presented and prioritized using the Measurement Alternatives and Ranking according to Compromise Solution (MARCOS) method. In the last step, the percentage reduction of the RPN as well as its most important component will be analyzed under each of the strategies. The results showed that considering the proposed mitigation strategies for the most critical threats could reduce the RPN by 89% for the wastewater collection and transmission system under flood preparedness programs, 84% for the chlorination unit by improving personnel skills and training for gas leak control, and 90% for the sludge thickening and pumping section by replacing components ahead of schedule for their useful life.

Keywords: Risk priority number, Wastewater treatment plant, Risk mitigation strategies, MARCOS multi-criteria decision-making method, Uncertainty reduction, Spherical fuzzy logic.

 

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