Abstract
Advanced oxidation process (AOPs) can be used for the treatment of harmful algal blooms (HABs). In this study, two systems of Fe2+/sodium percarbonate (Fe2+/SPC system) and Fe2+/sodium persulfate (Fe2+/PS system) were established to explore the removal mechanism of Microcystis aeruginosa (M. aeruginosa). The results indicated that the Fe2+/SPC system catalyzed H2O2 to generate a large amount of \(\bullet \mathrm{OH}\) for oxidation by Fe2+ and formed Fe3+ to promote the flocculation of M. aeruginosa. The persulfate was activated by Fe2+ to generate \({\mathrm{SO}}_{4}{\bullet }^{-}\) with super-oxidizing properties, and Fe3+ was generated to realize the oxidation and flocculation of M. aeruginosa in the Fe2+/PS system. Compared with the traditional method in which the pre-oxidation and flocculation processes are carried out separately, the method in this study effectively improves the utilization rate of the flocculant and the removal effect of M. aeruginosa. The absolute value of zeta potential of Fe2+/PS system (|ζ|= 0.808 mV) was significantly lower than that of Fe2+/SPC system (|ζ|= 21.4 mV) (P < 0.05), which indicated that Fe2+/PS system was more favorable for the flocculation of M. aeruginosa cells than the Fe2+/SPC system.
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Data availability
The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This work was financially sponsored by National Natural Science Foundation of China (32001201), Shanghai Sailing Program (20YF1447700), Natural Science Foundation of Guangdong Province (No. 2021A1515012221), Qingyuan Science and Technology Plan Project (2020KJJH012), and Science and Technology Innovation Fund for College Students.
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Qingyun Zhai: conceptualization, methodology, and writing—original draft
Lili Song: validation, formal analysis, investigation, and data curation
Saihua Huang: supervision and review and editing
**yan Ji: supervision, conceptualization, review and editing, and funding acquisition
Yueshu Yu: data curation and formal analysis
**g Ye: conceptualization and review and editing
Hua Wei: conceptualization and review and editing
Wenwu Xu: visualization
Meifang Hou: review and editing
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Zhai, Q., Song, L., Huang, S. et al. Removal mechanism of Microcystis aeruginosa in Fe2+/sodium percarbonate and Fe2+/sodium persulfate advanced oxidation-flocculation system. Environ Sci Pollut Res 30, 40911–40918 (2023). https://doi.org/10.1007/s11356-023-25163-w
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DOI: https://doi.org/10.1007/s11356-023-25163-w