A response surface methodology (RSM) was used for the determination of optimum coagulation process conditions for disperse navy blue dye wastewater treatment. The experimental design was Box-Behnken design (BBD) with three operational variables: coagulant dosage, pH value and settling time. The influence of these three independent variables on the chroma removal was evaluated using a second-order polynomial multiple regression model. Quadratic model was predicted for the response variable and the maximum model-predicted chroma removal efficiency was 95%. Based on surface and contour plots, the optimum conditions were obtained to be coagulant dosage of 70.98 mg/L, pH value of 7.46, and settling time of 15.80 min with the actual chroma removal efficiency as 93%.
By the reason of strong responses activity and oxidation ability, Chlorine dioxide as oxidant and disinfectant has been applied to peroxidation and disinfection more and more widely.In this paper, it give an account of the preparation of chlorine dioxide, as oxidants to raw water pretreatment, used in filter water disinfection ,the detection technology of chlorine dioxide and disinfection by-products, the water quality standards formulated by domestic and overseas chlorine dioxide in using chlorine dioxide, and summarized progress on drinking water treatment with chlorine dioxide .
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