期刊
CHEMOSPHERE
卷 237, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2019.124521
关键词
Bromate; Ozone; Chlorine; Sulfate radicals (SO4 center dot-); Ferrate; Hydroxyl radical ((OH)-O-center dot)
资金
- National Natural Science Foundation of China [51525805, 51708563, 51727821, 51608330]
- Science Starting Foundation of Guangzhou University [69-18ZX10303]
Chemical oxidation processes have been extensively utilized in disinfection and removal of emerging organic contaminants in recent decades. Some undesired byproducts, however, are produced in these processes. Of them, bromate has attracted the most intensive attention. It was previously regarded as a byproduct that typically occurred in ozone-based oxidation processes. However, for the past decade, bromate formation has been detected in other oxidation processes such as CuO-catalyzed chlorination, SO4 center dot--based oxidation, and ferrate oxidation processes. This review summarizes the occurrences, mechanisms, influencing factors, risk assessment, and control strategies of bromate formation in the four oxidation processes, i.e., ozone-based oxidation, chlorine-based oxidation, SO4 center dot--based oxidation, and ferrate oxidation. Besides, some unresolved issues for future studies are provided: (1) Clarification of the relative contributions of SO4 center dot- and Br center dot to the oxidation of bromine for bromate formation in SO4 center dot--based oxidation processes; (2) evaluation of the role of different reactive species in the bromate formation in the process of UV/HOCl; (3) quantification of the dual role of alkalinity in bromate formation during ozonation; (4) assessment of the risks of bromate formation in SO4 center dot--based oxidation processes for practical applications; and (5) exploration of strategies for inhibiting bromate formation in SO4 center dot--based oxidation, UV/chlorine, and metal oxide-catalyzed chlorination processes. (C) 2019 Published by Elsevier Ltd.
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