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Why does dissolved oxygen govern Mn(III) formation and micro-pollutant abatement in the permanganate/bisulfite process?
Dong, Huiyu; Duan, Shule; Liu, Chao; Yuan, Xiangjuan; Qiang, Zhimin
2020-07-01
Source PublicationCHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
Volume391Pages:1-11
AbstractPermanganate/bisulfite (PM/BS) process is a novel advanced oxidation process for degradation of micro-pollutants in water/wastewater treatment. The abatements of iopamidol (IPM), metribuzin (MET) and phenol by the PM/BS process after 15 s were 65%, > 99% and > 99%, respectively, while no obvious abatements were observed with PM or BS alone. These accelerated degradations by the PM/BS process were attributed to the formations of Mn(III), sulfur radical (SO4 center dot-) and hydroxyl radical (HO center dot). Interestingly, it was found that dissolved oxygen (DO) governed the abatement of micro-pollutants in PM/BS process. When DO was around 0.1 mg L-1, the abatements of all tested micro-pollutants were < 5%, significantly lower than those under 9.1-mg L-1 DO (65%-99%). Moreover, the formation of Mn(III) in the PM/BS process exhibited a positive dependence on DO consumption. Via electron paramagnetic resonance and quenching experiments, it was further found that the reduction of PM by BS generated SO3 center dot-, which could be oxidized by DO to SO5 center dot-. The Mn(III) formation stoichiometry of [PM]:[BS]:[DO] in the PM/BS process was determined to be 1:5:1.5 ratio. SO5 center dot- promoted the formations of not only Mn(III), but also SO4 center dot- and HO center dot, among which Mn(III) and SO4 center dot- mainly contributed to the degradation of micro-pollutants. Especially, this study illustrates that the formation pathway of Mn(III) in PM/BS process is not the direct reduction of Mn(VII), but the oxidation of Mn(II) by SO5 center dot-. Meanwhile, maintaining enough DO is indispensable for the degradation of micro-pollutants by the PM/BS process.
Department中国科学院饮用水科学与技术重点实验室
KeywordPermanganate/bisulfite Micro-pollutants Dissolved oxygen Radical
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/45387
Collection中国科学院饮用水科学与技术重点实验室
Recommended Citation
GB/T 7714
Dong, Huiyu,Duan, Shule,Liu, Chao,et al. Why does dissolved oxygen govern Mn(III) formation and micro-pollutant abatement in the permanganate/bisulfite process?[J]. CHEMICAL ENGINEERING JOURNAL,2020,391:1-11.
APA Dong, Huiyu,Duan, Shule,Liu, Chao,Yuan, Xiangjuan,&Qiang, Zhimin.(2020).Why does dissolved oxygen govern Mn(III) formation and micro-pollutant abatement in the permanganate/bisulfite process?.CHEMICAL ENGINEERING JOURNAL,391,1-11.
MLA Dong, Huiyu,et al."Why does dissolved oxygen govern Mn(III) formation and micro-pollutant abatement in the permanganate/bisulfite process?".CHEMICAL ENGINEERING JOURNAL 391(2020):1-11.
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