TemporalandSpatialVariationsinBulkChlorineDecay文献.pdfVIP

Temporal and Spatial Variations in Bulk Chlorine Decay within a Water Supply System 1 2 3 Benjamin J. Courtis ; John R. West ; and John Bridgeman Abstract: Modern water treatment must maintain an acceptable balance between the microbial safety of potable water supply, the costs of treatment, and the formation of potentially harmful disinfection by-products DBPs. In order to achieve the optimum balance, it is essential to understand and predict both the formation of DBP and the decay of chlorine, in relation to source water, treatment processes, storage, and supply. Reported herein are new data which demonstrate the lack of durability, precision, and accuracy associated with earlier empirical chlorine decay rate equations. This work develops an improved methodology for the prediction of variation in chlorine decay rates in distribution systems enabling practical, cost-effective prediction of the effects of both seasonal variations and management interventions on chlorine levels at treatment works and in distribution systems. DOI: 10.1061/ASCE0733-93722009135:3147 CE Database subject headings: Kinetics; Regression models; Water distribution systems; Water quality; Water sampling; Chlorine. Introduction dC = − kB . C 1 dt Disinfection of drinking water via the addition of chlorine has been practised globally for over 100 years White 1999. Chlorine