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AWWA ACE61702
- Pilot Study of Greater Boston Drinking Water Quality Changes - Monochloramine and pH Change
- Conference Proceeding by American Water Works Association, 06/17/2005
- Publisher: AWWA
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A pilot study was conducted from July 2001 to November 2003 to understand theimpact of ozonation on monochloramine decay and pH change in the futureMassachusetts Water Resources Authority's (MWRA) drinking water system. Theimpact of the distribution system, which consists of old cast-iron pipes, was alsoinvestigated.Homogeneous and heterogeneous samples were taken from the Pipe Loop Pilot Plant(PLPP), which represented the best and the worst scenarios respectively, i.e. a veryclean distribution system, or dead ends far from the main.The results suggested that corrosion and biological activity inside the pipe were themajor causes of the deteriorated water quality in heterogeneous samples. Inhomogeneous samples, ozonation may cause faster monochloramine decay and largerdecrease of pH. Therefore, more chemicals may be needed for pH adjustment andresidual disinfectant when the new Walnut Hill Water Treatment Plant (WHWTP) isonline. Includes 15 references, tables, figures.
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