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Using potassium ferrate control hazardous disinfection by-products during chlorination

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Abstract

The generation of hazardous disinfection by-product is one of the major problems in drinking water chlorination. This study aims to investigate the potential of potassium ferrate (K2FeO4) on by-product control. Filtered raw water from a water treatment plant in Jinan was used to evaluate the effects of K2FeO4 dose, pH, ammonia nitrogen, and Br concentration on trihalomethane formation potential (THMFP) and haloacetic acid formation potential (HAAFP). The results present that 3 mg/L K2FeO4 effectively reduced ultraviolet absorbance at 254 nm (UV254) by 45%, but removed little dissolved organic carbon (DOC) by 12% at pH 7.40, since K2FeO4 tends to attack the electron-rich part of organic matter molecules but with restricted mineralization ability. Fluorescence excitation-emission matrix (EEM) analyses indicate the effective removal of fulvic acid and humic acid. Increasing K2FeO4 dose reduced THMFP but increased HAAFP, due to their precursors reacting with K2FeO4 in different pathway, while the rising pH or Br concentration increased THMFP but decreased HAAFP. Both THMFP and HAAFP decrease with increasing ammonia nitrogen concentrations. Additionally, it was found that under alkaline conditions, trihalomethanes (THMs) were dominated by haloacetic acids (HAAs).

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The datasets used during this study are available from the authors on reasonable request.

Funding

This work was supported by the National Natural Science Foundation of China (Grant no. 51878394); Natural Science Foundation of Shandong Province (Grant no. ZR2020ME228); and the Introduction and Cultivation Plan for Young Innovative Talents of Colleges and Universities.

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H.B. Wang and D.D. Wang conceived and designed the experiments; D.D. Wang and J. Sun performed the experiments. D.D. Wang, J. Sun, and M. Li analyzed the data; D.D. Wang, J. Sun, W.W. Li, and N. Wang wrote the paper; funding acquisition, H.B.W. and N.W; review and editing, R.Z., N.W. All authors read and approved the final manuscript.

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Correspondence to Ning Wang.

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Responsible Editor: Ricardo Torres-Palma

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Table 1s: The water characteristics (DOCX 2.74 MB)

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Li, M., Sun, J., Wang, D.D. et al. Using potassium ferrate control hazardous disinfection by-products during chlorination. Environ Sci Pollut Res 28, 54137–54146 (2021). https://doi.org/10.1007/s11356-021-14525-x

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  • DOI: https://doi.org/10.1007/s11356-021-14525-x

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