This powerpoint presentation begins by presenting study objectives that include the following: to investigate how low-level intrusions,
from different sources, impact the
chlorine and chloramine residuals,
and the potential for microorganism
survival; and,
if water is intruded through a leak
after a low-pressure event, determine if microbial
survival may be enhanced if the
matrix exerts a disinfectant demand. Batch disinfection kinetics studies
were conducted in continuously-mixed
500 mL glass reactors
(maintained at 10ºC). Study conclusions indicate the following:
understanding matrix characteristics is important for
determining the significance of a low-level intrusion, the
higher the total organic carbon (TOC), the greater the potential to impact
disinfection residuals;
free chlorine residuals are more sensitive to wastewater
intrusion than chloramine residuals, 0.1% intrusion of
sewage caused up to 50% decrease (instantaneous) in
chlorine residuals but did not impact chloramine residuals; maintenance of a disinfectant residual provides a
protective barrier against low-level intrusions, and microbial
risk assessments are required to determine the extent of
the barrier; and,
low-level intrusion events are likely to go undetected by
online water quality monitors. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.1 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 10 |
| Published : | 11/01/2008 |
