| In recent years,cyanobacteria blooms have continued to erupt frequently,seriously jeopardizing the safety of drinking water and human health.How to safely,quickly and economically remove cyanobacteria from water bodies,a lot of people’s concerned about it.Expecially Microcystis aeruginosa（M.aeruginosa）,the dominant species of cyanobacteria.The application of advanced oxidation technology in water treatment is very promising,but it has not yet been used in production.In order to further promote the application of advanced oxidation method in actual water treatment technology,this article combines the results of advanced research at home and abroad to summarize the Advanced Oxidation Process（AOPs）.Various methods and mechanisms for removing the dominant species of cyanobacteria bloom,M.aeruginosa,in order to provide a certain theoretical reference and support for the efficient removal of harmful cyanobacteria in water.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 M.aeruginosa.The results indicated that the Fe2+/SPC system catalyzed H2O2to generate a large amount of·OH for oxidation by Fe2+,and formed Fe3+to promote the flocculation of M.aeruginosa.The persulfate was activated by Fe2+to generate SO4·-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 m V）was significantly lower than that of Fe2+/SPC system（|ζ|=21.4m V）（P<0.05）,which indicated that Fe2+/PS system was more favorable for the flocculation of M.aeruginosa cells than the Fe2+/SPC system.Due to a large number of untreated or incomplete industrial wastewater,pharmaceutical wastewater and domestic wastewater discharged into natural water,algal bloom and antibiotic resistance gene（ARGs）pollution,seriously affect the quality of human life and harm human health.In this experiment,water samples from Taihu Lake were treated by Fe2+/PS advanced oxidation system.The results were analyzed by high-throughput sequencing macroomics and atomic force microscopy.The results showed that Fe2+/PS system not only had excellent performance in laboratory water samples,but also was effective in removing extracellular free ARGs and preventing lateral migration of binding ARGs in real water samples.This experiment is intended to provide data support for later larger field water sample test. |
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