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Chloramine Prevents Manganese Accumulation in Drinking Water Pipes Compared to Free Chlorine by Simultaneously Inhibiting Abiotic and Biotic Mn(II) Oxidation
Li, Guiwei; Su, Yuliang; Wu, Bin; Chen, Qi; Yu, Jianwei; Yang, Min; Shi, Baoyou
2022-09-06
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
Volume56Issue:17Pages:12278-12287
AbstractThe oxidation of residual Mn(II) in finished water can lead to MnOx deposit formation in drinking water pipes. Previous work has illustrated that microbes readily cause Mn deposit build-up in nondisinfected pipes. Here, we investigated how disinfectant type and dose affected Mn(II) oxidation and MnOx accumulation through long-term pipe experiments using water produced by a full- scale water treatment plant. The results showed that Mn(II) oxidation initiated quickly in the new pipes chlorinated with 1.0 mg/L free chlorine. After 130 days of MnOx accumulation, 100 mu g/L Mn(II) in water could drop to 1.0 mu g/L within 1.5 h, resulting from autocatalytic Mn(II) oxidation and Mn(II) adsorption by MnOx deposits accumulated on pipe walls. In contrast to chlorination, chloramination (1.0 mg/L Cl-2) caused almost no MnOx accumulation during the entire study period. The underlying mechanism was probably that monochloramine inhibited microbial Mn(II) oxidation without causing significant abiotic Mn(II) oxidation like free chlorine. A low free chlorine dose (0.3 mg/L) also reduced Mn deposit formation by mass but to a lesser extent than chloramination. After disinfection (chlorination or chloramination) was discontinued for days, biotic Mn(II) oxidation occurred, and this process was inhibited again once disinfection was resumed. In addition, Fe(III) of 200 mu g/L enhanced the stability of MnOx accumulated on pipe surfaces, while humic acid induced MnOx deposit resuspension. Overall, this study highlighted the regulating role of disinfectants in MnOx formation and provided insights into developing appropriate disinfection strategies for Mn deposit control.
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
KeywordBOOSTER CHLORINATION MN OXIDES DEPOSITS MONOCHLORAMINE IRON RETHINKING KINETICS GROWTH PB
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/47832
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.Zhuhai Water Environm Holdings Grp Ltd, Zhuhai 519000, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Li, Guiwei,Su, Yuliang,Wu, Bin,et al. Chloramine Prevents Manganese Accumulation in Drinking Water Pipes Compared to Free Chlorine by Simultaneously Inhibiting Abiotic and Biotic Mn(II) Oxidation[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2022,56(17):12278-12287.
APA Li, Guiwei.,Su, Yuliang.,Wu, Bin.,Chen, Qi.,Yu, Jianwei.,...&Shi, Baoyou.(2022).Chloramine Prevents Manganese Accumulation in Drinking Water Pipes Compared to Free Chlorine by Simultaneously Inhibiting Abiotic and Biotic Mn(II) Oxidation.ENVIRONMENTAL SCIENCE & TECHNOLOGY,56(17),12278-12287.
MLA Li, Guiwei,et al."Chloramine Prevents Manganese Accumulation in Drinking Water Pipes Compared to Free Chlorine by Simultaneously Inhibiting Abiotic and Biotic Mn(II) Oxidation".ENVIRONMENTAL SCIENCE & TECHNOLOGY 56.17(2022):12278-12287.
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