Full Description

Many utilities are now investigating the use of ozone as a primary disinfectantdue to its higher disinfection capabilities. However, all oxidants, includingozone, react with natural organic matter (NOM) in water to form disinfectionbyproducts (DBPs). The presence of bromide in surface waters can lead to theformation of bromate, a DBP produced during ozonation, and a suspectedcarcinogen. This paper reports the results of a study undertaken by the WindsorUtilities Commission (WUC) of Windsor, Ontario, Canada, to improve thedisinfection process using pre-coagulation ozonation at WUC's A.H. Weeks Plant. The study objectives included: evaluation of the amount of bromide in the raw water source for the plant, the Detroit River; evaluation of bromate formation during pre-coagulation ozonation at four ozone dosages (1.2, 1.3, 2 and 3 ug/L); evaluation of bromate formation at various levels of initial bromide concentrations; evaluation of bromate formation for two contact times (Ct) (6.5 and 9 minutes); and establishment of a relationship between bromate formation and Ct values. Includes 17 references, figures.

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Edition: Vol. - No. Published: 01/01/2000 Number of Pages: 17File Size: 1 file , 270 KB