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Mechanisms for simultaneous ozonation of sulfamethoxazole and natural organic matters in secondary effluent from sewage treatment plant
Frontiers of Environmental Science & Engineering ( IF 6.4 ) Pub Date : 2020-11-16 , DOI: 10.1007/s11783-020-1368-0
Xinshu Liu , Xiaoman Su , Sijie Tian , Yue Li , Rongfang Yuan

Sulfamethoxazole (SMX) is commonly detected in wastewater and cannot be completely decomposed during conventional treatment processes. Ozone (O3) is often used in water treatment. This study explored the influence of natural organic matters (NOM) in secondary effluent of a sewage treatment plant on the ozonation pathways of SMX. The changes in NOM components during ozonation were also analyzed. SMX was primarily degraded by hydrolysis, isoxazole-ring opening, and double-bond addition, whereas hydroxylation was not the principal route given the low maximum abundances of the hydroxylated products, with m/z of 269 and 287. The hydroxylation process occurred mainly through indirect oxidation because the maximum abundances of the products reduced by about 70% after the radical quencher was added, whereas isoxazole-ring opening and double-bond addition processes mainly depended on direct oxidation, which was unaffected by the quencher. NOM mainly affected the degradation of micropollutants by consuming OH rather than O3 molecules, resulting in the 63%–85% decrease in indirect oxidation products. The NOM in the effluent were also degraded simultaneously during ozonation, and the components with larger aromaticity were more likely degraded through direct oxidation. The dependences of the three main components of NOM in the effluent on indirect oxidation followed the sequence: humic-like substances>fluvic-like substance-s>protein-like substances. This study reveals the ozonation mechanism of SMX in secondary effluent and provides a theoretical basis for the control of SMX and its degradation products in actual water treatment.



中文翻译:

污水处理厂二次废水中磺胺甲恶唑和天然有机物同时臭氧化的机理

磺胺甲恶唑(SMX)通常在废水中检测到,在常规处理过程中无法完全分解。臭氧(O 3)通常用于水处理。这项研究探讨了污水处理厂二级废水中天然有机物(NOM)对SMX臭氧化途径的影响。还分析了臭氧化过程中NOM组分的变化。SMX主要通过水解,异恶唑开环和双键添加而降解,而鉴于羟基化产物的最大丰度较低,m / z较低,因此羟化不是主要途径分别为269和287。羟化过程主要通过间接氧化发生,因为加入自由基淬灭剂后产物的最大丰度降低了约70%,而异恶唑环的开环和双键添加过程则主要取决于直接氧化,因此不受淬灭剂的影响。NOM主要通过消耗 OH而不是O 3来影响微污染物的降解。分子,导致间接氧化产物减少63%–85%。在臭氧氧化过程中,废水中的NOM也同时降解,而具有较大芳香性的组分更可能通过直接氧化而降解。废水中NOM的三个主要成分对间接氧化的依从性依次为:腐殖质样物质>流体样物质-s>蛋白样物质。这项研究揭示了SMX在次级废水中的臭氧化机理,并为实际水处理中SMX及其降解产物的控制提供了理论依据。

更新日期:2020-11-25
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