高铁酸钾预氧化对消毒副产物生成势的影响

The Effect of Potassium Ferrate Pre-Oxidation on Disinfection by-Products

为了有效控制氯化过程消毒副产物的生成,以苯胺(AN)作为目标污染物,探究了高铁酸钾(Fe(VI))预氧化对后续氯化消毒过程中消毒副产物生成势的影响,并重点考察了Fe(VI)浓度、氯化pH、液氯浓度、氯化时间以及水质背景成分对消毒副产物生成势的影响。研究表明,高浓度Fe(VI)(150μmol/L)预氧化可有效减小各消毒副产物的生成势,氯化pH可以影响液氯的存在形式及消毒副产物的稳定性,从而对各消毒副产物的生成势产生不同的影响。消毒副产物的生成势受液氯浓度以及氯化时间的影响比较显著。在氯化工艺前耦合Fe(VI)预氧化工艺可明显降低天然水体中消毒副产物的生成势。

In order to control effectively the generation of disinfection by-products in the chlorination process,the effect of potassium ferrate(Fe(VI))pre-oxidation on the generation potential of disinfection by-products in the subsequent chlorination process was investigated with aniline(AN)as the target pollutant.In this study,we explored the effect of Fe(VI)concentration,chlorination pH value,liquid chlorine concentration,chlorination time and water quality background composition on the formation potential of disinfectant by-products.Results indicated that the high concentration of Fe(VI)(150μmol/L)pre-oxidation could reduce the generation potential of each disinfection by-product.And the chlorination pH value affected the existence form of liquid chlorine and the stability of the disinfection by-product,which had different impact on the generation potential of each disinfection by-product.Besides,the formation potential of disinfection by-products was significantly affected by the concentration of liquid chlorine and chlorination time.Moreover,coupling Fe(VI)oxidation process before chlorination process could obviously reduce the generation potential of disinfectant by-products in actual water.