Chlorine decay Analysis in Water Distribution System

by Eyob Sebhatu

Submitted : Spring 2018

The production of safe and clean water involves a disinfection processes that is mainly accomplished by adding chlorine at the treatment plant. Due its highly reactive nature chlorine decays overtime, as a result of its reaction with contaminants and pipe materials. This results in the reduction of available chlorine as the water travels in the distribution system. The amount of residual chlorine in the distribution system is one of the important parameters used to assess the safety of the drinking water. Drinking water quality standards require that a drinking water supplied through a municipal distribution system should have a residual chlorine of more than 0.5 mg/L. It, is therefore, is important to know the critical points in the distribution system where chlorine concentration would fall below the required residual levels. This project estimates the travel time of water in the distribution system at which point the residual chlorine falls below the standard values. This is important to implement booster chlorination system to ensure that minimum residual chlorine is maintained throughout the distribution system and provide safe drinking water to all customers at all time.

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