MODELING OF CHLORINE DECAY IN NUST DRINKING WATER DISTRIBUTION SYSTEM

Abstract

Water quality deterioration in drinking water distribution network has a great impact on public health. Residual chlorine in distribution system decays gradually and should be maintained within the acceptable limit to avoid recontamination and microbial growth. The objective of this study is to investigate the ability of EPANET 2.0 and WaterCAD V 8 XM to simulate residual chlorine decay along drinking water distribution network, taking water-age analysis into consideration and to locate points on the network where chlorine boosters should be installed. Hydraulic model was run by using the data provided by University's project management office. Bulk decay coefficient was calculated by regression method in the laboratory and wall decay coefficient was assumed from the literature review. Calculated bulk decay value was -0.0711fl and wall decay coefficient value was 0 ft/day. Water quality analysis showed that the initial chlorine dosage currently used was not enough to provide clean drinking water to all the consumers. 8 points were located for the installation of chlorine boosters, which are to provide water with required chlorine levels to the consumers.