Removal of F-538 as PFOS alternative in chrome plating wastewater by UV/Sulfite reduction

被引:78
作者
Bao, Yixiang [1 ]
Huang, Jun [1 ]
Cagnetta, Giovanni [1 ]
Yu, Gang [1 ]
机构
[1] Tsinghua Univ, Beijing Key Lab Emerging Organ Contaminants Contr, Sch Environm, SKJLESPC,POPs Res Ctr, Beijing 100084, Peoples R China
基金
中国国家自然科学基金;
关键词
UV/Sulfite; Chrome mist suppressant; F-53B; PFASs; Wastewater treatment; PERFLUOROOCTANE SULFONATE PFOS; POLYFLUOROALKYL SUBSTANCES PFASS; PERFLUOROALKYL SUBSTANCES; HYDRATED ELECTRONS; ACIDS; DECOMPOSITION; TOXICITY; EXPOSURE; KINETICS; DEFLUORINATION;
D O I
10.1016/j.watres.2019.114907
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Chrome mist suppressants are key chemicals used in the chrome plating industry to reduce exposure of workers by inhalation to airborne chromic acid pollution. Perfluoroalkyl sulfonated compounds are excellent mist suppressants, thanks to their chemical stability and surface activity. Therefore, despite mounting evidence for their persistence, bioaccumulation and toxicity, it is likely that such chemicals will continue to be used for the foreseeable future because of their importance and lack of alternatives. The present study is aimed at assessing the feasibility of advanced reduction as an effective technology to treat chrome plating industry wastewater. In particular, wastewater containing a chlorinated polyfluorinated ether sulfonate (i.e. F-53B), an alternative to perfluorooctanesulfonate (PFOS) used to prepare chrome mist suppressant in China, was treated by UV-activated sulfite. Results demonstrates that in ultrapure water F-53B can be easily degraded within 1 min-much faster than PFOS. Stoichiometric fluoride recovery was also achieved, confirming significant defluorination of the pollutant Such superior reducibility was due to the presence of chlorine atoms, as corroborated by quantum chemical calculations. F-53B degradation was also achieved in chrome plating industrial wastewater, which yielded results were slower than those achieved in the laboratory nonetheless obtained complete abatement within 60 min. These results suggest that the proposed advanced reduction process is one of the safest options to control PFAS discharge in the environment and reduce the related risks to ecosystems. (C) 2019 Elsevier Ltd. All rights reserved.
引用
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页数:9
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