Influence of Water Quality Characters on Kinetics of Chlorine Bulk Decay in Water Distribution Systems
Al Heboos Sonia, Dr. Licskó István

Abstract
Several water quality parameters are contributing to the bulk chlorine degradation in drinking water system. The objective of this study is investigating the influence of the bio-filtration, initial chlorine concentration, UV disinfection and the natural organic matter (NOM) on the kinetics of bulk chlorine decay. Laboratory batch tests and various treatments including zeolite filtration, coagulation, powder (PAC) and granular activated carbon (GAC) adsorption were applied on different types of water samples. Results of this study indicated that bulk chlorine demand was high and its decay rate was rapid although of the low concentrations of iron, manganese and ammonium in the investigated samples. Disinfection by UV irradiation has no important effect on chlorine decay reverse to the influence of initial chlorine concentration and COD, where most of chlorine consummation was contributed mainly by NOM, and this result was supported by the observed increase of THM concentration in the studied network.

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