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Mn(II) Oxidation by Free Chlorine Catalyzed by the Hydrolytic Products of Ferric and Aluminum Species under Drinking Water Conditions
Li, Guiwei; Zhao, Yuanyuan; An, Guangyu; Shi, Baoyou
2022-08-02
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
Volume56Issue:15Pages:10775-10784
AbstractMn(II) oxidation by free chlorine can be applied to remove Mn(II) at water treatment plants. This reaction also results in particulate MnOx formation and accumulation in drinking water distribution systems. This study investigated the effect of Fe(III) and Al(III) hydrolysis products (mainly precipitates) on Mn(II) oxidation by free chlorine under drinking water conditions. The results showed that Fe3+ added as FeCl3 and Al(III) added as polyaluminum chloride (PACl) at tens to hundreds of micrograms per liter dramatically catalyzed Mn(II) oxidation by free chlorine. Through hydrolytic precipitation at circumneutral pH, Fe3+ and Al-13 (the dominant preformed Al species in PACl) generated Fe(OH)(3)-like particles and Al-13 aggregates, respectively, which initiated heterogeneous Mn(II) oxidation. Kinetic modeling indicated that, once some MnOx was formed, MnOx and Fe(OH)(3) catalyzed the subsequent Mn(II) oxidation to an equal extent. The particles (aggregates) formed from Al-13 species exhibited a weaker catalytic capacity in comparison to MnOx and Fe(OH)(3) at equivalent molar concentrations. Interestingly, unlike Al-13 species in PACl, Al(III) added as AlCl3 had a negligible influence on Mn(II) oxidation, even when Al(OH)(3)(am) precipitates were formed. The catalytic effects of Fe3+ and Al-13 hydrolysis products were confirmed by experiments with natural water and finished water, and the lower Mn(II) oxidation rate was mainly attributed to organic matter.
Department中国科学院饮用水科学与技术重点实验室 ; 中国科学院饮用水科学与技术重点实验室
KeywordSOLUBLE MANGANESE REMOVAL NATURAL ORGANIC-MATTER COAGULATION MECHANISMS POLYALUMINUM CHLORIDE DISTRIBUTION-SYSTEMS RESIDUAL ALUMINUM METAL-SALTS IRON PIPES STABILITY DEPOSITION
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/47877
Collection中国科学院饮用水科学与技术重点实验室
Corresponding AuthorShi, Baoyou
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Li, Guiwei,Zhao, Yuanyuan,An, Guangyu,et al. Mn(II) Oxidation by Free Chlorine Catalyzed by the Hydrolytic Products of Ferric and Aluminum Species under Drinking Water Conditions[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2022,56(15):10775-10784.
APA Li, Guiwei,Zhao, Yuanyuan,An, Guangyu,&Shi, Baoyou.(2022).Mn(II) Oxidation by Free Chlorine Catalyzed by the Hydrolytic Products of Ferric and Aluminum Species under Drinking Water Conditions.ENVIRONMENTAL SCIENCE & TECHNOLOGY,56(15),10775-10784.
MLA Li, Guiwei,et al."Mn(II) Oxidation by Free Chlorine Catalyzed by the Hydrolytic Products of Ferric and Aluminum Species under Drinking Water Conditions".ENVIRONMENTAL SCIENCE & TECHNOLOGY 56.15(2022):10775-10784.
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