Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Modeling Chlorine Residuals in Drinking-Water Distribution Systems.
Author Rossman, L. A. ; Clark, R. M. ; Grayman, W. M. ;
CORP Author Environmental Protection Agency, Cincinnati, OH. Drinking Water Research Div.
Publisher 1994
Year Published 1994
Report Number EPA/600/J-94/379;
Stock Number PB95-125530
Additional Subjects Potable water ; Distribution systems ; Water distribution ; Chlorine ; Computerized simulation ; Water pollution abatement ; Reprints ; Disinfection ; Microbial degradation ; Reaction kinetics ; Water quality management ; Mass transfer ; EPANET computer program
Library Call Number Additional Info Location Last
NTIS  PB95-125530 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 03/06/1995
Collation 22p
A mass transfer-based model is developed for predicting chlorine decay in drinking water distribution networks. The model considers first order reactions of chlorine to occur both in the bulk flow and at the pipe wall. The overall rate of the wall reaction is a function of the rate of mass transfer of chlorine to the wall and is therefore dependent on pipe geometry and flow regime. The model can thus explain field observations that show higher chlorine decay rates associated with smaller pipe sizes and higher flow velocities. It has been incorporated into a computer program call EPANET that can perform dynamic water quality simulations on complex pipe networks. The model is applied to chlorine measurements taken at nine locations over a 53 hour period from a portion of the South Central Connecticut Regional Water Authority's service area. Good agreement with observed chlorine levels over a range of assumed wall decay constants is obtained at locations where the hydraulics are well-characterized. The model should prove to be a valuable tool for managing chlorine disinfection practices in drinking water distribution systems.