Effects of reductive inorganics and NOM on the formation of chlorite in the chlorine dioxide disinfection of drinking water

作     者：Biao Yang Hua Fang Bingqi Chen Shun Yang Zhichao Ye Jianghua Yu Biao Yang;Hua Fang;Bingqi Chen;Shun Yang;Zhichao Ye;Jianghua Yu

作者机构：Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science&EngineeringNanjing University of Information Science&TechnologyNanjing 210044China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2021年第33卷第6期

页      面：225-232页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0815[工学-水利工程] 

基　　金：supported by the National Key Research and Development Program of China(No.2018YFD0900805) the Practice Innovation Program of Postgraduates in Jiangsu Province(No.SJCX20_0306)。 

主　　题：Chlorine dioxide Chlorite Disinfection by-products Reductive inorganics Natural organic matter 

摘      要：Chlorine dioxide(ClO_(2))disinfection usually does not produce halogenated disinfection byproducts,but the formation of the inorganic by-product chlorite(ClO^(–)_(2))is a serious consideration.In this study,the ClO^(–)_(2)formation rule in the ClO_(2)disinfection of drinking water was investigated in the presence of three representative reductive inorganics and four natural organic matters(NOMs),respectively.Fe^(2+)and S^(2–)mainly reduced ClO_(2)to ClO^(–)_(2)at low concentrations.When ClO_(2)was consumed,the ClO^(–)_(2)would be further reduced by Fe^(2+)and S^(2–),leading to the decrease of ClO^(–)_(2).The reaction efficiency of Mn^(2+)with ClO_(2)was lower than that of Fe^(2+)and S^(2–).It might be the case that Mn O 2 generated by the reaction between Mn^(2+)and ClO_(2)had adsorption and catalytic oxidation on Mn^(2+).However,Mn^(2+)would not reduce ClO^(–)_(2).Among the four NOMs,humic acid and fulvic acid reacted with ClO_(2)actively,followed by bovine serum albumin,while sodium alginate had almost no reaction with ClO_(2).The maximum ClO^(–)_(2)yields of reductive inorganics(70%)was higher than that of NOM(around 60%).The lower the concentration of reductive substances,the more ClO^(–)_(2)could be produced by per unit concentration of reductive substances.The results of the actual water samples showed that both reductive inorganics and NOM played an important role in the formation of ClO^(–)_(2)in disinfection.