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Algae-containing raw water treatment and by-products control based on ClO2 preoxidation-assisted coagulation/precipitation process

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Abstract

Eutrophication has become a great concern in recent years with the algae blooms in source water resulting in a serious threat posing to the safety of drinking water. Chlorine dioxide (ClO2) has been served as an alternative oxidant for preoxidation or disinfection during drinking water treatment process due to its high oxidation efficiency and low risk of organic by-products formation. However, the generation of inorganic by-products including chlorite (ClO2) and chlorate (ClO3) has become a potential problem when applied in drinking water treatment. In this study, ClO2 preoxidation-assisted coagulation/precipitation process was applied to improve the raw water quality, especially algae, turbidity, chemical oxygen demand (CODMn), and UV254, and explore the formation mechanisms of inorganic by-products. It was found that the polymeric aluminum chloride (PAC) and ClO2 have shown the best raw water treatment performance with the optimal dosage of 10 mg/L and 0.8 mg/L, respectively. Moreover, the initial pH also has exhibited a notable influence on pollutants treatment and by-products generation. Due to the adverse influence of algae and natural organic matters (NOM) and the generation of by-products, it was significant to investigate their inhibition effect on the water quality and the production of ClO2 and ClO3 in the ClO2 preoxidation-assisted coagulation/precipitation process. Moreover, it was applicable of this process to apply for the algae-containing raw water (calculated as Chl.a lower than 50 μg/L) treatment with the ClO2 dosage of less than 0.8 mg/L to achieve optimum treatment performance and minimum by-products generation.

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Acknowledgements

This work was supported by Shenzhen Scientific Research Foundation for High-level Talent (Grant number KQJSCX20180328165658476), Shenzhen Scientific Fundamental Research Foundation (Grant number JCYJ20180306171843211 and JCYJ20180306172051662), and Start-up funding for High-level Talent.

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WS, ZW, and CF carried out the experiments. WS, JL, and CF conceived the project. WS, XZ, CF, and ZW contributed to study design, analysis, and writing.

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Correspondence to Caixia Fu.

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Song, W., Li, J., Zhang, X. et al. Algae-containing raw water treatment and by-products control based on ClO2 preoxidation-assisted coagulation/precipitation process. Environ Geochem Health 44, 3837–3851 (2022). https://doi.org/10.1007/s10653-021-01055-1

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