L. Heller-Grossman, Anna Idin, B. Limoni-Relis
Feb 11, 1999
Citations
1
Influential Citations
78
Citations
Quality indicators
Journal
Environmental Science & Technology
Abstract
Production of cyanogen bromide (CNBr) and other volatile DBPs was studied in bromide-rich lake water during disinfection with chlorine, chloramine, and chlorine dioxide. The different disinfectants were dosed to the lake water in laboratory experiments, and the resulting concentrations of CNBr, trihalomethanes (THMs), and haloacetonitriles (HACNs) were measured. CNBr concentration is a resultant of formation and decomposition by hydrolysis. Maximum concentration (36 μg/L) was obtained at low chlorine dose (1.5 mg/L) at pH 7.5 and 10 h contact time. Under these conditions, the molar distribution of the volatile DBPs was 50% CNBr, 40% THMs, and 10% HACNs. It is suggested that CNBr is formed by the reaction of hypobromous acid with organic N precursors present in lake water. Fulvic acid was found to be a good precursor for THMs but a poor precursor for CNBr. With chloramination, yields of CNBr, THMs, and HACNs were much lower, only 6, 11, and 2 μg/L, respectively. CNBr concentration was stable for 10 days. C...