title: Formation potentials of bromate and brominated disinfection by-products in bromide-containing water by ozonation.
abstract: The ozonation involved in drinking water treatment raises issues of water quality security when the raw water contains bromide (Br(-)). Br(-) ions may be converted to bromate (BrO3 (-)) during ozonation and some brominated disinfection by-products (Br-DBPs) in the following chlorination. In this study, the effects of ozone (O3) dosage, contact time, pH, and Br(-) and ammonia (NH3-N) concentrations on the formation of BrO3 (-) and Br-DBPs have been investigated. The results show that decreasing the initial Br(-) concentration is an effective means of controlling the formation of BrO3 (-). When the concentration of Br(-) was lower than 100 μg/L, by keeping the ratio of O3 dosage to dissolved organic carbon (DOC) concentration at less than 1, BrO3 (-) production was effectively suppressed. The concentration of BrO3 (-) steadily increased with increasing O3 dosage at high Br(-) concentration (>900 μg/L). Additionally, a longer ozonation time increased the concentrations of BrO3 (-) and total organic bromine (TOBr), while it had less impact on the formation potentials of brominated trihalomethanes (Br-THMFP) and haloacetic acids (Br-HAAFP). Higher pH value and the presence of ammonia may lead to an increase in the formation potential of BrO3 (-) and Br-DBPs.
authors.affiliation: Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Hohai University, Nanjing, 210098, People's Republic of China, hit_lintao@163.com.
authors.forename: Tao
authors.initials: T
authors.lastname: Lin
authors.forename: Shouke
authors.initials: S
authors.lastname: Wu
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
mesh_terms: D001959:Bromates / Q000737:chemistry*; D001965:Bromides / Q000737:chemistry*; D001966:Bromine; D004202:Disinfectants / Q000737:chemistry; D004203:Disinfection / Q000379:methods*; D054879:Halogenation; D010126:Ozone; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods*; D060753:Water Quality
chemical_list: D001959:Bromates; D001965:Bromides; D004202:Disinfectants; D014874:Water Pollutants, Chemical; D014867:Water; D010126:Ozone; D001966:Bromine