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针对二氧化氯消毒的供水管网中管垢对消毒副产物浓度的影响,对管网中管垢吸附亚氯酸根和氯酸根的动力学和热力学机理进行了研究,同时考察了管网水中亚氯酸根和氯酸根的初始浓度、反应时间、p H值和温度对管垢吸附的影响。结果显示,管垢对水中氯酸根和亚氯酸根的最大吸附率分别为32.0%和40.8%,吸附率随着p H值和温度的升高而减小。在此基础上探讨了管垢吸附亚氯酸根和氯酸根的动力学和热力学模型,结果显示吸附动力学二级模型和Freundlich模型拟合管垢吸附过程的效果最好。
Aiming at the effect of tube scale on the concentration of disinfection byproducts in chlorine dioxide disinfected water supply pipe network, the kinetics and thermodynamics mechanism of scale adsorption of chlorite and chlorate in tube network were studied. At the same time, Effect of initial concentration of chlorate and chlorate, reaction time, p H value and temperature on scale adsorption. The results showed that the maximum adsorption rates of chlorate and chlorate in water were 32.0% and 40.8%, respectively. The adsorption rate decreased with the increase of p H and temperature. On the basis of this, kinetic and thermodynamic models of the scale adsorption of chlorite and chlorate were discussed. The results showed that the adsorption kinetics secondary model and the Freundlich model were the best ones to fit the tube scale adsorption process.