This powerpoint presentation begins by providing a brief overview of Dallas Water Utilities and a case study involving colored water complaints. The study design included
monitoring 16 distribution system locations for a
period of 12 months, and monitoring of parameters that included:
pH;
disinfection residual; assimilable organic carbon (AOC);
biological growth indicators - HPCs;
nitrification indicators - Nitrite, Nitrate, AOB; and,
corrosion indicators - iron, turbidity. Elements contributing to the cause of colored water were identified as the following:
water leaving the treatment plants was
biologically unstable;
biological re-growth,
nitrification and lowering of pH in the distribution system; and, the leaching of pipe scale resulted in red water at customer taps. A pilot study of pipe wall/
water interactions is presented, along with colored water management
strategies for
treatment plants including
enhanced
coagulation,
biological
filtration, and chlorine/ammonia
ratio of 5:1. Recommended colored water treatment strategies for the
distribution
system included
periodic
flushing,
booster
chlorination, and corrosion
inhibitor
addition. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 2.1 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 28 |
| Published : | 11/01/2008 |
