Study on Formation of Bromate in Ozone Disinfection of Mineral Water

In order to decrease the bromate content in the mineral water,the effect of ozone, bromide,and water quality on bromate formation were investigated by using the different concentration bromide with different ozone concentrations for 5 min to ozonatedthe mineral waters, ultrapure water and drinking water.Meanwhile,drinking water with certain bromide was applied for the CT(ozone concentration×contact time,CT) effect on the bromate formation. It was found that with the increase of ozone and bromideconcentrations,the generated bromate increased. When ozone concentration was ≥0.4 mg/L,with the same bromide addition,the bromates generated in mineral water were more than that in ultrapure water and drinking water. At the same time,the bromate produced in the 3 kinds of mineral waters were different,but above 10 μg/L. The increase of CT value(ozone concentration×contact time,CT)led to the steep increase of generated bromate. Therefore,decreasing in the concentration of ozone and bromide may minimize the formation of bromate in ozone disinfection of mineral water.