| A serial bench-scale experiments were conducted to study the effect of ammonia, pH, initial dissolved ozone and temperature on bromate formation during ozonation process in Yangtze river water, where bromide anion(Br-) was detected. Ammonia has little suppression effects on bromate production in Yangtze water at pH 7.35 and 0.6 mg/Ｌ ammonia background concentration, for it can't block the indirect-direct path. Within our experiment's conditions， at the initial dissolved ozone from 0.8 mg/Ｌ to 2.5 mg/Ｌ, it should be kept below 1.2 mg/Ｌ in order to avoid bromate standard violation. BrO-3 formation is sensitive to pH variation. BrO-3 production is 8 μg/L when pH decreases to 6.3. Lower temperature leads to both slower ozone decomposition and lower production of bromate. BrO-3 production is 9.1 μg/L at 10℃, 100 μg/L initial Br- and 1.6 mg/Ｌ initial dissolved ozone. |
