给水管网中氯酸根和亚氯酸根消减因素研究

Study on Factors Reducing Chlorate and Chlorite in Water Distribution Network

采用二氧化氯消毒的给水管网中氯酸根和亚氯酸根浓度在管网前后端存在明显差异,研究了管网中各因素对水中消毒副产物转化的影响,并在此基础上分析给水管网中氯酸根和亚氯酸根浓度的消减模型。研究结果表明,各因素中碳酸钙吸附和管网材质对氯酸根和亚氯酸根浓度的影响最大。在20℃、p H值=7、氯酸根或亚氯酸根初始浓度为1.5 mg/L时,碳酸钙对氯酸根和亚氯酸根的吸附率分别为23.3%、38.0%,纯铁管材管网中氯酸根和亚氯酸根的消减率分别为43.3%和48.0%。温度、p H值和紫外照射对氯酸根的影响微弱,而在30℃、p H值=5和紫外照射下的亚氯酸根分解率最高。

A significant difference in chlorate and chlorite concentration existed between the initial and terminal sections of water distribution network disinfected by chlorine dioxide. The influence of the factors on the conversion of disinfection by-products in water was investigated, and the model for reducing the chlorate and chlorite concentration was analyzed based on this. The results showed that the most important impacts on chlorate and chlorite were calcium carbonate adsorption and pipe network material. At 20℃, pH 7, 1.5 mg/L chlorate or chlorite, the adsorption rates of chlorate and chlorite by calcium carbonate were 23.3% and 38.0% respectively, and the reduction rates of chlorate and chlorite by iron pipe were 43.3% and 48.0% respectively. Furthermore, the temperature, pH and UV irradiation had slight impact on chlorate, while at 30℃, pH 5 and ultraviolet irradiation, the decomposition rate of chlorite was higher.