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This powerpoint presentation begins by providing a brief overview of chlorination and the problems of disinfection byproduct (DBP) formation and and increased corrosion rates. Research objectives were to: investigate haloacetic acid and nitrosamineformation as a result of the interactions betweendisinfectant residual, pipe materials, and corrosioninhibitors;elucidate the kinetics of disinfectant residualdegradation and DBP formation; and,develop empirical and mechanistic models topredict haloacetic acid and nitrosamine formation. Research methodologies are presented, including: simulated distribution system (SDS); material-specific simulated distribution system (MS-SDS); uniform formation conditions (UFC); and, pipeloops. Conclusions for disinfectant degradation kinetics indicate that: first-order kinetics with this source water;fast reaction observed for HOCl; and,corrosion inhibitor affected disinfectantdegradation differently with respect todisinfectant type and metals. Conclusions for HAA9 indicate: increased with reaction time and HOClconcentration as expected;no significant impact from corrosion inhibitors;iron produced least HAA9; and,degraded by iron phosphate-associatedcorrosion products. Conclusions for NDMA indicate: no significant formation under chlorination;initially increased, but leveled off or decreasedwith reaction time in terms of differentcorrosion inhibitors;iron produced least NDMA; and,no degradation by iron (+ortho) was observed. Includes tables, figures.

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Edition: Vol. - No. Published: 11/01/2009 Number of Pages: 35File Size: 1 file , 1.6 MB