Applicability Analysis of Ozone Disinfection in Rural Drinking Water Supply from Two Aspects: Ozone Decay and Bromate Formation

Abstract

Ozone disinfection was widely used in rural drinking water supply projects in North China, however, more attention needed to be drawn to the fact that the ozone did not have continuous disinfection effect and the bromate by-product formed may be over standard in the disinfection process. The researches on ozone decay and bromate by-product formation were both done in this paper, the purpose of which was to explore the applicability of the ozone disinfection in rural drinking water supply projects. Ozone decay rate was affected by a number of factors, such as temperature, pH, pipe, initial ozone concentration, ozone dosing methods, etc. The bromate formation was affected by the bromide concentration and CODMn of raw water, ozone dosage, etc. The results showed that ozone disinfection was compatible when the bromide concentration of raw water was lower, and the pipe network was shorter in rural water supply projects, especially for those that used plastic pipe. Meanwhile, the ozone dosage must be strictly controlled.