高锰酸钾与氯联用消毒控制饮用水中三卤甲烷生成量

主要考察了高锰酸钾与氯联用消毒工艺的化学安全性。研究了氯投量、高锰酸钾投量、Br^-浓度和pH值等因素对高锰酸钾与氯联用消毒工艺三卤甲烷(THMs)生成量及生成形态的影响。结果表明：氯投量对THMs生成量及生成形态有显著影响。随着氯投量的增大，THMs生成量显著升高，且溴代三卤甲烷(Br-THMs)占主要部分。高锰酸钾投量对THMs生成影响较小。THMs与Br-THMs的生成量随着Br^-浓度及pH值的升高而增加。与单独氯消毒工艺比较，高锰酸钾与氯联用消毒减少了氯投量，降低了THMs的生成量。高锰酸钾与氯联用消毒工艺在保障饮用水的化学安全性上优于单独氯消毒工艺。

Combined Use of Permanganate and Chlorine for Disinfection to Control Trihalomethane Formation in Drinking Water

The chemical safety of the combined disinfecting process which employs both permanganate and chlorine for disinfection has been investigated. Effects of chlorine dose, permanganate dose, bromide concentration and solution pH on formation and speciation of trihalomethane ( THMs ) have been studied for this process. Results of this study show that chlorine has impact on formation and speciation of THMs whereas permanganate affects relatively less; THMs formation significantly increases with higher chlorine dose among which brominated trihalomethane ( Br THMs ) is the main speciation; furthermore, THMs and Br THMs formation increases with higher Br and higher pH. Generally, the application of both permanganate and chlorine for disinfection reduces chlorine dose in practice and consequently minimizes THMs formation. In comparing with chlorination, this combined disinfecting process exhibits better characteristics in assuring chemical safety of drinking water.