AWWA QTC97189

Bromate is produced as a disinfection byproduct (DBP) when bromide-containing waters are subjected to ozonation. Although many studies have been conducted on bromate formation that have provided a basic understanding of the chemistry of bromate formation, most of these have been conducted under batch-scale ozonation conditions and have limited direct applicability to full-scale, continuous-flow ozonation reactors. This study examined the formation of bromate in a bench-scale, continuous-flow, completely mixed ozone reactor by varying ozone dose and water quality parameters, such as influent bromide ion concentration, pH, total organic carbon (TOC) concentration and total inorganic carbon (TIC) concentration. Conditions that influence mass transfer were also investigated. Model solutions of known chemical composition were used in the study. Bromate concentrations were analyzed using two different ion chromatographic (IC) techniques, the direct injection and IC/spectrophotometric methods.