Affiliations: Department of Chemistry, Harbin Institute of Technology, Harbin 150090, China | Department of Civil Engineering, Yaraaguchi University, Ube 755, Japan | School of Civil Engineer, Harbin Institute of Technology, Harbin 150090, China
Abstract: Water quality within water distribution system may vary with both location and time. Water quality models are used to predict the spatial and temporal variation of water quality throughout water system. A model of residual chlorine decay in water pipe has been developed, given the consumption of chlorine in reactions with chemicals in bulk water, bio-films on pipe wall, in corrosion process, and the mass transport of chlorine from bulk water to pipe wall. Analytical methods of the flow path from water sources to the observed point and the water age of every observed node were proposed. Model is used to predict the decay of residual chlorine in an actual distribution system. Good agreement between calculated and measured values was obtained.
Keywords: residual chlorine, bulk water, corrosion, bio-film, water quality, water distribution system, flow path, water age