文献类型：期刊文献

英文题名：Transformation kinetics and pathways of sulfamonomethoxine by UV/H2O2 in swine wastewater

作者：Li, Yejin[1];Yang, Linyan[1,2,3];Chen, Xueming[4];Han, Yuefei[1];Cao, Guomin[1,2,3]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Natl Engn Lab Ind Wastewater Treatment, Shanghai 200237, Peoples R China;[3]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;[4]Fuzhou Univ, Coll Environm & Resources, Fuzhou 350116, Fujian, Peoples R China

年份：2021

卷号：265

外文期刊名：CHEMOSPHERE

收录：;EI(收录号：20204909577185);WOS:【SCI-EXPANDED(收录号:WOS:000603465000098)】；

基金：This study was supported by National Water Pollution Control and Treatment Science and Technology Major Project (2017ZX07207002) and National Key R&D Program (2019YFC0408202).

语种：英文

外文关键词：Sulfamonomethoxine; Antibiotics; UV/H2O2; Degradation pathway; Swine wastewater

摘要：Sulfamonomethoxine (SMM), as one of the most predominant antibiotics in animal wastewater, is pending for effective control to minimize its environmental risks. Transformation kinetics and pathways of SMM by UV/H2O2 in swine wastewater were systematically investigated in this study. Direct UV photolysis (as a dominant role) and center dot OH oxidation contributed to SMM degradation in UV/H2O2 system. The less effective reaction rate of SMM in real wastewater than synthetic wastewater (0.1-0.17 vs. -0.2 -1.5 min 1 , despite higher H2O2 dosage and extended reaction time) resulted mainly from the abundant presence of conventional contaminants (indicated by COD, a notable competitor of SMM) in real wastewater. SMM degradation benefited from higher H2O2 dosage and neutral and weak alkaline conditions. However, the effect of initial SMM concentration on SMM degradation in synthetic and real wastewater showed opposite trends, owning to the different probability of SMM molecules to interact with UV and H2O2 in different matrices. Carbonate had an inhibitory effect on SMM degradation by scavenging center dot OH and pH-variation induced effect, while nitrate promoted SMM degradation by generating more center dot OH. The removal efficiency of SMM in real wastewater reached 91% under the reaction conditions of H2O2 of 10 mM, reaction time of 60 min, and pH 6.7-6.9. SMM degradation pathway was proposed as hydroxylation of benzene and pyrimidine rings, and secondary amine, and the subsequent cleavage of S-N bond. (C) 2020 Elsevier Ltd. All rights reserved.