2017 : Risk Assessment of Total Coliform in X WTP’s Water Production Using Failure Mode And Effect Analysis Method

Ir. Atiek Moesriati M.Kes.


Abstract

Based on IPA Kedunguling testing report on March 2016, it is noted that the total coliform contained in the sample has exceeded the quality standard of Peraturan Menteri Kesehatan RI No 492/2010. The presence of total coliforms indicates water contamination by pathogen. Exceeding the quality standard means that the water is not safe to be consumed. The disinfection process has an importance rule in pathogen inactivation. Disinfectant performance is influenced by temperature, turbidity, pH, and the presence of organic materials. The potential risks should be measured to determine causes of the problems and to find the appropriate risk reduction. The goal of this research is to control the quality of water by using a risk management approach Failure Modes and Effect Analysis (FMEA) methods. The risk assessment is using Risk Priority Number scale as a basis prioritization of remedial action on issues. Based on identification and risk analysis using FMEA, it is known that the greatest risks of failure are the stipulation of chlorine dose and organic substances in category of high risk level, residual chlorine in category of moderate risk level, and turbidity and pH in category very low risk level category. Some improvements that can be done to reduce total coliforms presence in IPA Kedunguling are by increasing residual chlorine to 0.6 mg/l, by determining a daily chlorine level, by controlling DBPs forming through lowering the concentration of organic precursor using granular activated carbon (GAC) or aeration, by lowering the dose of disinfectant, by separating DBPs after the compound is formed using GAC, by monitoring turbidity and pH, and by …