This powerpoint presentation begins by providing a brief overview of the Mystic Water System. The problem statement includes the following:
compliance with Stage 2 Disinfectant/Disinfection Byproduct (D/DBP) Rule; and,
control of Mn and Fe.
The study objectives include the following:
evaluate impacts of pre-filter chlorine on DBP levels; and, investigate options to decrease DBP formation while
maintaining Fe and Mn removal.
The Scope of Work includes the following:
full-scale studies of sampling across plants at various prefilter
Cl<sub>2</sub> doses, DBP and metals analyses, collecting filter
media cores; and,
bench-scale studies of chlorine demand, kinetics, DBP
formation, chloramination, jar and column experiments. Presentation conclusions indicate that:
pre-filter Cl<sub>2</sub> and KMnO<sub>4</sub> rapidly oxidized iron and
manganese (with pH controlled at 7.0-7.2);
a low pre-filter chlorine dose (2 mg/L) produces similar
filter influent water quality conditions as that of a high prefilter
chlorine dose (6-8 mg/L); plant effluent DBP formation directly proportional to prefilter
chlorine dose;
decreasing the pre-filter chlorine from 8 mg/L to 2 mg/L
resulted in 70-90% decrease in plant effluent DBP
formation and short term control of Mn and Fe;
after 35-55 days low pre-filter chlorine (2.0 mg/L) resulted
in an apparent release of Mn; and,
increasing pre-filter chlorine to 4-5 mg/L prevents Mn
release, but increases DBP formation. Includes figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 950 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 30 |
| Published : | 11/01/2008 |
