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 nitrosamine
formation as a result of the interactions between
disinfectant residual, pipe materials, and corrosion
inhibitors;
elucidate the kinetics of disinfectant residual
degradation and DBP formation; and,
develop empirical and mechanistic models to
predict 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 disinfectant
degradation differently with respect to
disinfectant type and metals. Conclusions for HAA9 indicate: increased with reaction time and HOCl
concentration as expected;
no significant impact from corrosion inhibitors;
iron produced least HAA9; and,
degraded by iron phosphate-associated
corrosion products. Conclusions for NDMA indicate: no significant formation under chlorination;
initially increased, but leveled off or decreased
with reaction time in terms of different
corrosion inhibitors;
iron produced least NDMA; and,
no degradation by iron (+ortho) was observed. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.6 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 35 |
| Published : | 11/01/2009 |
