The Contra Costa Water District (CCWD), through an American Water Works
Association Research Foundation (AwwaRF) Tailored Collaboration Project,
conducted an evaluation of the efficacy of preoxidation with a combination of
chlorine dioxide (ClO2) and ozone (O3) at its 40 mgd Randall-Bold Water
Treatment Plant (WTP). This facility is a direct filtration plant that uses raw water
preozonation for taste and odor control and filtration enhancement and
ozonation after filtration (post ozonation) for primary disinfection. Results
indicated that: ClO2 addition before preozonation reduced bromate formation;
a majority of the chlorite formed by ClO2 reactions with raw water
constituents was oxidized to chlorate by ozonation; and, preoxidation with
ClO2 was as effective as preoxidation with ozone for enhancing filtration.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 210 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 4 |
| Published : | 06/15/2003 |
