engleski

Bromate formation during ozonation and effect of ammonium addition

Bromide in water can produce undesirable by- products such as bromate when treated by ozonation during drinking water production. The Croatian regulation (OG 125/17) sets the maximum contaminant level (MCL) of bromate in water at 10 µg/L, adopting the value from the World Health Organization recommendations and EU directives. According to Spearman rank correlation coefficients, bromate formation is significantly affected by ozone dose, ozonation time, bromide concentration and ammonium concentration. Despite the low bromide content (15 µg/L), water from Lake Butoniga has a high potential for bromate formation above the MCL with prolonged ozonation at higher doses (0.3 and 0.5 mg/L). Samples with ammonium addition had less than 7 µg/L bromate after 45 minutes, while no bromates were present at all at the 0.1 mg/L ozone dose. Since bromate is carcinogenic and difficult to remove later, the addition of ammonium is a successful method of reducing its formation.

bromide, bromate, ozonation, drinking water production

nije evidentirano