Abstract
Disinfection is the last treatment process in the Drinking Water Treatment Plant. Chlorine dioxide (ClO2) is a widely used environmental friendly disinfectant which is employed in this process. The aim of this work was to optimize the reaction conditions and improve the formula of the solid chlorine dioxide disinfectant. Magnesium sulfate (MgSO4) and citric acid were employed as the stabilizer and activator, respectively. Sodium chlorite (NaClO2) and sodium bisulfate (NaHSO4) were used as the reactants. The concentration of chlorine dioxide was determined by the five-step iodometry method. The results showed that the percentage of chlorine dioxide have a relationship with the reaction temperature, reaction time, the mass ratio of NaClO2 and NaHSO4. The percentage of chlorine dioxide has a para-curve relationship with the reaction time. At 2.5 h, it reached the highest percentage of chlorine dioxide about 6.3%. And the optimal reaction temperature is 25°C under the nearly ideal state mass ratio of NaClO2:NaHSO4 =1:1.071. The formula is suggested to be a proper composition of the solid environmental friendly chlorine dioxide disinfectant.
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