Many treatment process upgrades nationwide are implemented
without looking at how the changes will affect the disinfectant
residuals in the distribution system. This article shows
that filtration and oxidation processes can significantly affect the
chloramine residual in the distribution system. Therefore, changes to
filtration and oxidation at the treatment plant should be carefully
evaluated for their effect on chloramine secondary disinfectant. The
main premise is to minimize chloramine demand and decay in water
leaving the plant through appropriate treatment options so that stable
combined chlorine residual is developed for the distribution system.
Many utilities are moving toward chloramines to comply
with Stage 2 of the Disinfectants/Disinfection Byproducts
Rule. The tendency in the United States has been toward
higher doses of chloramines to provide a detectable residual in
distribution systems, but it may be possible with simple treatment
changes to lower these doses and provide better customer
satisfaction. The authors provide examples of a simple
test that utility personnel can perform to better understand the
characteristics of chloramines throughout the treatment
process. Includes 39 references, figures.
| Edition : | Vol. 95 - No. 7 |
| File Size : | 1
file
, 200 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 13 |
| Published : | 07/01/2003 |
