文献类型：期刊文献

英文题名：Conversion of chlorine/nitrogen species and formation of nitrogenous disinfection by-products in the pre-chlorination/post-UV treatment of sulfamethoxazole

作者：Zhang, Tian-Yang[1,3];Xu, Bin[2,3];Yao, Shijie[1];Hu, Yaru[1];Lin, Kuangfei[1];Ye, Hui[4];Cui, Changzheng[1,3]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Key Lab Yangtze Water Environm,Minist Educ, Shanghai 200092, Peoples R China;[3]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;[4]Natl Engn Res Ctr Urban Water Resources, Shanghai 200082, Peoples R China

年份：2019

卷号：160

起止页码：188

外文期刊名：WATER RESEARCH

收录：;EI(收录号：20192206994762);WOS:【SCI-EXPANDED(收录号:WOS:000474327700018)】；

基金：This work was sponsored by Natural Science Foundation of China (No. 51808222), Shanghai Sailing Program (No.18YF1406000), China Postdoctoral Science Foundation (No. 2017M621391), the National Water Pollution Control and Management Technology Major Projects (No. 2017ZX07402003), the Fundamental Research Funds for the Central Universities (No. 222201814055) and Program of Shanghai Academic/Technology Research Leader (No. 16XD1420500).

语种：英文

外文关键词：Sulfamethoxazole (SMX); Pre-chlorination; UV irradiation; Organic chloramines; Disinfection by-products (DBPs)

摘要：Pre-chlorination and UV disinfection are two common processes in drinking water treatment plants. Sulfamethoxazole (SMX), an antibiotic widely detected in source water, was selected as a precursor to study the conversion of chlorine/nitrogen species and DBP formation in pre-chlorination/post-UV process. The combined chlorine (mainly organic chloramines) produced in pre-chlorination of SMX can self-degrade and release free chlorine back again as pre-chlorination time goes on. With free chlorine dose increasing, the self-degradation rate of combined chlorine increased obviously. But the combined chlorine stopped self-degrading and remained stable around 1 mg-Cl-2/L after adding 0.30 mM chlorine for 30 min. Post-UV treatment after pre-chlorination can enhance the degradation and achieve a complete removal of combined chlorine (including organic chloramines). Deamination occurred during prechlorination/post-UV process and deamination amount (-NH2) per SMX concentration was 0.19 M/M. Radicals in this process had no obvious influence on chlorine/nitrogen species conversion. Direct chlorination of SMX had the lowest DBP formation potentials while the application of pre-chlorination and UV enhanced them. Compared with UV treatment only, dichloroacetonitrile formation potential of SMX reduced by 1.58 x 10(-3) mol/mol-SMX (17.37 mu g/l) after pre-chlorination/post-UV treatment. During prechlorination/post-UV/final-chlorination treatment of SMX, Br- and natural organic matter can enhance DBP formation and toxicity-weighted values. Acid conditions showed a very high DBP risk, while alkaline conditions could cut this risk obviously, especially for the toxicity-weighted values of these DBPs. (C) 2019 Elsevier Ltd. All rights reserved.