Since early 2002, the Alameda County Water District (ACWD) has controlled bromate formation
using pH suppression via the addition of carbon dioxide ahead of ozonation. By reducing the
pH, ACWD has been able to maintain the plant effluent bromate concentration at less than the
regulatory standard of 10 µg/L. While the pH suppression strategy has been successful in
controlling bromate, it can be expensive under certain conditions. A full-scale investigation was
conducted to evaluate the addition of chloramine ahead of ozonation, and compare the
performance of this bromate control technique to that of pH suppression. This paper presents
the results of the bromate control investigation to date. Chloramine addition was shown to be
equally effective to pH reduction for controlling bromate, at a significant reduction in cost.
Potential effects of chloramine addition on downstream processes have not yet been
determined for this plant, and a second phase of the study is planned to assess these long-term
impacts. Includes 7 references, tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 910 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 11 |
| Published : | 11/01/2008 |
