AWWA WQTC59021

The objective of this study is to investigate the formation of bromate during ozonation when controlling the pH by sulfuric acid and carbon dioxide addition in natural water. Experimental results will be used in a later phase of the project to develop recommendations for strategies aimed at minimizing bromate formation during drinking water treatment with ozone while providing adequate CT levels for the control of C. parvum oocysts. The kinetic information will be incorporated into a model that will be used for such a purpose. Experiments were performed with raw water from a drinking water treatment plant that has the following parameters: Temperature (oF) 74.6; Turbidity (NTU) 8; pH 7.8; Conductivity (umhos/cm) 178; Alkalinity (mg/L as CaCO3) 54; Hardness (mg/L as CaCO3) 60; and, Chloride (mg/L) 18. In addition, the bromide ion concentration in the raw water was the relatively low value of 25 ug/L. It was decided to spike the water with additional bromide to increase the concentration to a target value of approximately 200 ug/L, which is more representative of the medium bromide levels typically observed in this water. Other materials and methods discussed include reagents and solutions and the experimental setup. Includes 5 references, table, figures.