单过硫酸盐预氧化体系中消毒副产物的生成特性  

Disinfection byproduct formation during peroxymonosulfate preoxidation process

作　　者：陈田田 李晓晨[1] 楚文海[2] 徐挺[2] 尹大强[2] CHEN Tiantian;LI Xiaochen;CHU Wenhai;XU Ting;YIN Daqiang(College of Water Conservancy and Civil Engineering,Shandong Agricultural University,Tai’an,271018,China;College of Environmental Science and Engineering,Tongji University,Shanghai,200092,China)

机构地区：[1]山东农业大学水利土木工程学院,泰安271018 [2]同济大学环境科学与工程学院,上海200092

出　　处：《环境化学》2022年第10期3196-3204,共9页Environmental Chemistry

基　　金：国家重点研发项目(2021YFC3200800)资助.

摘　　要：单过硫酸盐(PMS)作为预氧化剂,在预氧化过程中能够去除微污染物.但是PMS也能够氧化氯离子(Cl-)为有效氯(HOCl/OCl-).HOCl/OCl-会和有机物发生反应生成消毒副产物(DBPs).DBPs具有致畸、致癌和致突变的特性.然而,有关PMS预氧化过程中DBPs生成特性的研究相对较少.本文考察了预氧化时间、PMS浓度、Cl-浓度和pH对DBPs浓度和细胞毒性(CTI)的影响.研究结果表明,随着预氧化时间以及Cl-浓度的增加,DBPs浓度和CTI增加.随着PMS浓度的增加,三氯甲烷、水合三氯乙醛、二氯乙酰胺和三氯乙酰胺的浓度增加,但是二氯乙腈、三氯乙腈的浓度和CTI先增加后降低.随着pH的增加,DBPs浓度和CTI降低.综合而言,在PMS预氧化过程中,在满足预氧化效果的同时,应缩短预氧化时间,降低原水中Cl-浓度,同时提高pH,来降低DBPs浓度和毒性.Peroxymonosulfate(PMS)is used as the pre-oxidant,which can remove effectively micropollutants during pre-oxidation process.However,PMS can also convert chloride(Cl-)to reactive chlorine(HOCl/OCl-).HOCl/OCl-can react with organic matter and then generate disinfection byproducts(DBPs).DBPs have teratogenic,carcinogenic and mutagenic properties.Few studies investigated the formation of DBPs during the PMS pre-oxidation process.This study investigated effects of pre-oxidation time,PMS concentration,Cl-concentration and pH on the formation of DBPs and cytotoxicity index(CTI).Results showed that DBPs concentrations and CTI increased as pre-oxidation time and Cl-concentration increased.The concentrations of trichloromethane,trichloroacetaldehy,dichloroacetamide and trichloroacetamide increased as the PMS concentration increased,while the concentrations of dichloroacetonitrile and trichloroacetonitrile,and CTI first increased and then decreased.DBPs concentrations and CTI decreased as the pH increased.In general,under the condition of ensuring requirement of preoxidation,the pre-oxidation time should be reduced to reduce DBPs concentrations and toxicity during PMS pre-oxidation process.Furthermore,Cl-concentration in water should be reduced and pH should increase during PMS pre-oxidation process.

关 键 词：单过硫酸盐 预氧化 消毒副产物 酪氨酸 氯离子 

分 类 号：TU991.25[建筑科学—市政工程]