Degradation of iopamidol in the permanganate/sulfite process:Evolution of iodine species and effect on the subsequent formation of disinfection by-products  

作　　者：Yimin Lin Hongyu Dong Yating Zhu Gongming Zhou Junlian Qiao Xiaohong Guan 

机构地区：[1]State Key Laboratory of Pollution Control and Resources Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China [2]Department of Environmental Science,School of Ecological and Environmental Sciences,East China Normal University,Shanghai 200241,China

出　　处：《Journal of Environmental Sciences》2024年第1期345-352,共8页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.22206050,22025601,21976133 and 52270047);the National Key Research and Development Program of China (No.2019YFC1805202);the State Key Laboratory of Pollution Control and Resource Reuse Foundation (No.PCRRK20014)。

摘　　要：Permanganate/sulfite(Mn(VII)/S(IV))process is a promising pre-oxidation technology for sequestering the emerging organic contaminants in drinking water treatment plant.Iopamidol(IPM),a representative of iodinated X-ray contrast media,has been widely detected in water sources and has the risk of forming iodinated disinfection byproducts(I-DBPs)in water treatment system.In this study,we investigated the evolution of iodine species during the IPM degradation by the Mn(VII)/S(IV)process and its effect on the subsequent formation of I-DBPs during chlorination at pH 7.0 and 8.0.IPM could be effectively degraded in the Mn(VII)/S(IV)process at environmentally relevant pH(pH 7.0 and 8.0).The results of quenching and competitive oxidation kinetic experiments revealed that SO^(·-)_(4)was the major reactive oxidizing species contributing to the degradation of IPM whereas the contributions of HO·and reactive manganese species were negligible in the Mn(VII)/S(IV)process.I–and IO–3were generated while no HOI was detected during the degradation of IPM in the Mn(VII)/S(IV)process.The effects of IPM oxidation by Mn(VII)/S(IV)on the subsequent formation of chlorinated disinfection by-products(Cl-DBPs)during chlorination were related to the category of Cl-DBPs.The pre-oxidation of IPM by Mn(VII)/S(IV)resulted in the generation of I-DBPs during the disinfection process although no I-DBPs were detected if no pre-oxidation was applied.The finding of this study suggested that attention should be paid to the toxicity of DBPs when water containing iodinated organic contaminants is treated by Mn(VII)/S(IV)process or other pre-oxidation technologies.

关 键 词：Permanganate/sulfite IOPAMIDOL Sulfate radical Iodinated disinfection byproducts PRE-OXIDATION 

分 类 号：TU991.2[建筑科学—市政工程]