预氧化工艺对含溴饮用水消毒副产物生成的影响  

Effect of Pre-Oxidation Process on DBPs Formation in Bromine-Containing Drinking Water

作　　者：严好婷 俞昊天 陈玉敏 留嘉婧 叶东东 毛玉琴 YAN Haoting;YU Haotian;CHEN Yumin;LIU Jiajing;YE Dongdong;MAO Yuqin(College of Biological and Environmental Engineering,Zhejiang Shuren University,Hangzhou310015,China)

机构地区：[1]浙江树人学院生物与环境工程学院,浙江杭州310015

出　　处：《净水技术》2022年第7期41-46,153,共7页Water Purification Technology

基　　金：浙江省自然科学基金(LQ20E080015);浙江省大学生科技创新活动计划暨新苗人才计划(2021R421011)。

摘　　要：预氧化工艺在提高对水中有机物去除效率的同时还会改变有机物的性质,有可能会对后续氯消毒过程中消毒副产物(DBPs)的生成产生不利的影响,尤其是当水中含有溴离子时,这种不利影响可能会扩大。目前,关于溴离子和有机物在预氧化-消毒组合工艺中的协同转化规律还未可知。文中考察了臭氧和二氧化氯对含溴水体在后续氯消毒过程中三卤甲烷(THMs)、卤乙酸(HAAs)和二卤乙腈(DHANs)等DBPs生成和分配的影响。研究结果表明,在臭氧和二氧化氯预氧化后,THMs和HAAs的总生成潜能随氧化剂投加量的增大呈现先增加后降低态势,DHANs总生成势随着氧化剂投加量的增加而逐渐减少。从DBPs总量控制的视角考虑,建议提高氧化剂的投放量,且高投量的臭氧对DBPs总量生成的抑制作用优于二氧化氯预氧化。然而,臭氧和二氧化氯预氧化都会促进后续氯消毒过程中THMs、HAAs和DHANs中溴代组分所占的比重上升,即溴结合因子增加。氧化剂含量越高,溴结合因子也越大。因此,对于某些含溴水体增设预氧化工艺,还需谨慎考虑因毒性更高的溴代DBPs生成比例增大而产生潜在的危险性。Pre-oxidation process can improve the removal efficiency of organic matter,while it can change the properties of organic matter.It may have adverse effect on the formation of DBPs during subsequent chlorination,especially when the raw water contains bromide ions.At present,the synergistic transformation law of bromide ions and organic matter in the combined process of preoxidation and disinfection is unknown.In this study,ozone and chlorine dioxide were selected to investigate the effect of pre-oxidation process on DBPs formation and speciation in bromine-containing water during subsequent chlorination.Trihalomethanes(THMs),haloacetic acids(HAAs)and dihaloacetonitriles(DHANs)were included.The results showed that the total formation potentials of THMs and HAAs were firstly increased and then decreased with the dosages of ozone and chlorine dioxide increased,while the total formation potentials of DHANs kept decreasing.From the perspective of controlling the total DBPs yields,a high oxidant dosage was suggested,and the decreased amount of the total DBPs yields by high dosage ozone was larger than by chlorine dioxide.However,the proportion of bromine-containing DBPs were increased by pre-oxidation with both ozone and chlorine dioxide.The higher the oxidant dosage,the greater the bromine incorporation factor values were.Therefore,adding pre-oxidation process in treating water with high bromide levels should be cautious for the potential danger caused by the increase in the proportion of bromine-containing DBPs with hiher toxicity.

关 键 词：臭氧 二氧化氯 消毒副产物 溴结合因子 溴分配 

分 类 号：TU991[建筑科学—市政工程]