Removal efficiency of microcystis in water by chlorine dioxide

Water blooms leading by eutrophication had become a serious problem threatening the safety of drinking water.The research on removal of Microcystis by ClO2 was systematically performed in this paper.Results were showed:(1)ClO2 could effectively remove Microcystis.The removal efficiency of chlorophyll was in positive correlation to ClO2 dosage and the reaction time and in negative correlation to initial concentration chlorophyll,whereas it was affected by temperature and pH value slightly.As ClO2 dosage was 2.5mg·L-1,temperature was 25℃,pH value was 7.17 and the reaction time was 15min,the removal efficiency of M.wesenbergii(102#) and M.aeruginosa(905#和915#)were 97.23%、96.2% and 92.33% respectively.(2)preoxidation treatment of Microcystis in water by ClO2 was investigated,as the dosage of ClO2 was 2.5mg·L-1,removal efficiency of chlorophyll and Microcystis were 98.5% and 95% respectively and turbidity decreased to 89.08%.Compared with conventional water treatment methods,preoxidation treatment of ClO2 could effectively remove Microcystis,decreased turbidity and guarantee the drinking water quality.