Degradation of Micropollutants and Formation of Oxidation By-Products during the Ozone/Peroxymonosulfate System: A Critical Review
The O<sub>3</sub>/PMS system has appeared as an effective wastewater treatment method because of the simultaneous generation of hydroxyl radicals (<sup>•</sup>OH) and sulfate radicals (SO<sub>4</sub><sup>•−</sup>). Many research achievements have been...
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| Autores principales: | , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/76e1ded16b644c89b6000a454a3601ef |
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| Sumario: | The O<sub>3</sub>/PMS system has appeared as an effective wastewater treatment method because of the simultaneous generation of hydroxyl radicals (<sup>•</sup>OH) and sulfate radicals (SO<sub>4</sub><sup>•−</sup>). Many research achievements have been made on the degradation of micropollutants and the reaction mechanism of the O<sub>3</sub>/PMS system. However, an integral understanding of the O<sub>3</sub>/PMS system is lacking, which limits the development of safe and effective AOP-based water treatment schemes. Therefore, in this review, the degradation effects, toxicity changes, and reaction mechanisms of various micropollutants in the O<sub>3</sub>/PMS system are reviewed. The formation of oxidation by-products (OBPs) is an important issue that affects the practical application of O<sub>3</sub>/PMS systems. The formation mechanism and control methods of OBPs in the O<sub>3</sub>/PMS system are overviewed. In addition, the influence of different reaction conditions on the O<sub>3</sub>/PMS system are comprehensively evaluated. Finally, future research needs are proposed based on the limited understanding of O<sub>3</sub>/PMS systems in the degradation of micropollutants and formation of OBPs. Specifically, the formation rules of several kinds of OBPs during the O<sub>3</sub>/PMS system are not completely clear yet. Furthermore, pilot-scale research, the operational costs, sustainability, and general feasibility of the O<sub>3</sub>/PMS system also need to be studied. This review can offer a comprehensive assessment on the O<sub>3</sub>/PMS system to fill the knowledge gap and provide guidance for the future research and engineering applications of the O<sub>3</sub>/PMS system. Through this effort, the O<sub>3</sub>/PMS system can be better developed and turned towards practical applications. |
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