Cyanobacterial blooms present great challenges to drinking water treatment and human health. The novel combination of potassium permanganate (KMnO) and ultraviolet (UV) radiation is engaged as a promising advanced oxidation process in water purification. This study investigated the treatment of a typical cyanobacteria, Microcystis aeruginosa by UV/KMnO. Cell inactivation was significantly improved by UV/KMnO treatment, compared to UV alone or KMnO alone, and cells were completely inactivated within 35 min by UV/KMnO in natural water. Moreover, effective degradation of associated microcystins was simultaneously achieved at UV fluence rate of 0.88 mW cm and KMnO dosages of 3-5 mg L. The significant synergistic effect is possibly attributable to the highly oxidative species produced during UV photolysis of KMnO. In addition, the cell removal efficiency via self-settling reached 87.9 % after UV/KMnO treatment, without additional coagulants. The fast in situ generated manganese dioxide was responsible for the enhancement of M. aeruginosa cell removal. This study firstly reports multiple roles of UV/KMnO process in cyanobacterial cell inactivation and removal, as well as simultaneous microcystin degradation under practical conditions.
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