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In November 2000 the Washington Aqueduct (WA), the water treatmentprovider to the District of Columbia, switched its disinfectant from chlorine tochloramines in order to reduce disinfection byproducts (DBP). This disinfection changeproved successful as total trihalomethanes and halo acetic acids decreased considerablyin the distribution system, which is operated by the District of Columbia Water sub4/sub. Over the next 12 months,WASA studied the formation of lead phosphate and the stability of the phosphate scale inthe distribution system through the data collected from lead profiles.This paper discusses the results of the research conducted prior to and after thestart of orthophosphate corrosion control. Specifically this paper describes proceduresand results from laboratory circulation loops and lead profiles conducted at residentialhomes with lead service lines in relation to the lead concentrations being released, thetype of lead being released (i.e. dissolved Lead-II or particulate Lead-IV), and the amountof time for the orthophosphate to properly passivate the lead in the service lines. Includes 3 references, figures.

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Edition: Vol. - No. Published: 11/01/2005 Number of Pages: 16File Size: 1 file , 400 KB