Reaction law of high purity chlorine dioxide and typical substances in raw water

Abstract

Abstract Great concern has been risen due to the harmful by-product formation in chlorine dioxide disinfection. To control the by-product formation, we need to know the factor that make a great contribution to generate by-product in drinking water treatment. The Fe2+, Mn2+, organic matter and algae are the most presenting matters that could cause the formation of chlorite; thus, they were selected as factors in the study. The results showed that the amount of by-product chlorite produced increased along with the increase of the concentrations of organic matter, algae and Fe2+ in water, but the presence of Mn2+ didn’t impact on the formation of chlorite. In addition, the interaction between Fe2+ and Mn2+ was observed, but no obvious interaction between other factors was found. So when the concentration of above factors exceed the standard, the chlorine dioxide is not recommended in any step of the water treatment.