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This paper discusses how a utility and its bulk supplier have been working cooperatively on a pilot study of entrypoint chloramination to quench the formation of additional disinfection byproducts in thedistribution system. The bulk supplier constructed chloramination facilities at the entrypoint and has been operating these facilities since June 2002. The utility and its bulksupplier have been monitoring relevant entry point and distribution system water qualityparameters quarterly or monthly since 1998. The monitoring data illustrate the temporaland spatial extent of disinfection byproduct control achieved through entry pointchloramination. The costs to construct and operate the pilot facilities provide benchmarksfor other utilities facing a similar challenge.Chloramination of the entry point appears to have reduced the formation of additionaldisinfection byproducts significantly. Chloramination also appears to have other waterquality benefits in the distribution system. The effort, financial and otherwise, needed toimplement entry point treatment is one that utilities should consider only afterimplementing other strategies to minimize the formation of disinfection byproducts.Other systems with variable bulk water quality, competing water quality objectives,extensive reliance on unlined cast iron pipe, poorly configured pipe networks and limitedfunds may benefit from the experiences of this system. Benefiting systems include thoseconsidering boosting residuals in their distribution systems, as well as other consecutivesystems. Includes 4 references, figures.

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Edition: Vol. - No. Published: 11/02/2003 Number of Pages: 14File Size: 1 file , 420 KB