Risk Assessment for Gas Chlorination Units of Water and Wastewater Treatment with FMEA Method

Abstract

In the present paper, based on case study, risk measurement using failure mode effects analysis (FMEA1) methodology was performed in 4 chosen water and wastewater treatment plants in Mashhad. In this method, first the chlorination units were categorize to 6 classes including cylinders storage, chlorination room, gas cylinders, transportation of chlorine gas, joints of chlorination equipment, and educational systems of employee and management. The different potential modes of failures of these water and wastewater treatment units were listed and the severity rating, occurrence rating, and detectability rating were determined with interviewing the experts. According to these, risk priority number was calculated and the risk of mode of failure was prioritized in the parts of the water and water treatment plants. The results indicate that in general, the first priorities corresponded to the risks in terms of electrical and transportation; and using standard equipment and appropriate means of transport were suggested.

Keywords

• chlorination
• fmea
• risk analysis
• risk priority number
• water and wastewater treatment