Practical Studies of the Electrolysis and Volatilization of the Bromide from Drinking Water to Minimize Bromate Production by Ozonation

摘要

In two recently published papers (Kimbrough & Suffet 2002, Kimbrough & Suffet 2005), a process for the oxidation bromide to bromine and the volatilization of bromine from drinking water sources was presented. This process was shown to be able to remove up to 35% percent of the bromide found naturally in the California State Water Project. While bromide itself is quite harmless, it has been shown to react with commonly used disinfectants to produce compounds or disinfection by-products (DBPs) of suspected carcinogens. Bromide reacts with ozone to form bromate. This paper presents a study of a pilot scale, flow through electrolytic reactor which oxidizes bromide to bromine and volatilizes bromine at < pH 3.5. The bromide removal rates were studied at several different water flows and power settings for different bromide concentrations. The system is trying to remove the presence of bromide before ozonation. The results show removal of bromide is impacted by water flows and power settings for different bromide concentrations. Bromate formation was reduced but the relationship between bromide removal and the reduction of bromate was a complex one needs further study and optimization.