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Since early 2002, the Alameda County Water District (ACWD) has controlled bromate formationusing pH suppression via the addition of carbon dioxide ahead of ozonation. By reducing thepH, ACWD has been able to maintain the plant effluent bromate concentration at less than theregulatory standard of 10 g/L. While the pH suppression strategy has been successful incontrolling bromate, it can be expensive under certain conditions. A full-scale investigation wasconducted to evaluate the addition of chloramine ahead of ozonation, and compare theperformance of this bromate control technique to that of pH suppression. This paper presentsthe results of the bromate control investigation to date. Chloramine addition was shown to beequally effective to pH reduction for controlling bromate, at a significant reduction in cost.Potential effects of chloramine addition on downstream processes have not yet beendetermined for this plant, and a second phase of the study is planned to assess these long-termimpacts. Includes 7 references, tables, figures.

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Edition: Vol. - No. Published: 11/01/2008 Number of Pages: 11 File Size: 1 file , 910 KB