Multiple roles of UV/KMnO4 in cyanobacteria containing water treatment: Cell inactivation & removal, and microcystin degradation

Jiajia Fan; Jianwei Zeng; Xuchun Li; Kaiheng Guo; Wang Liu; Jingyun Fang

doi:10.1016/j.jhazmat.2023.131772

Multiple roles of UV/KMnO₄ in cyanobacteria containing water treatment: Cell inactivation & removal, and microcystin degradation

J Hazard Mater. 2023 Sep 5:457:131772. doi: 10.1016/j.jhazmat.2023.131772. Epub 2023 Jun 8.

Authors

Jiajia Fan¹, Jianwei Zeng², Xuchun Li³, Kaiheng Guo⁴, Wang Liu⁵, Jingyun Fang⁶

Affiliations

¹ School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, Zhejiang, China. Electronic address: fanjiajia@hznu.edu.cn.
² Ocean College, Zhejiang University, Hangzhou 310058, Zhejiang, China.
³ School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, China.
⁴ School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China.
⁵ School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, Zhejiang, China.
⁶ School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China. Electronic address: fangjy3@mail.sysu.edu.cn.

PMID: 37307725
DOI: 10.1016/j.jhazmat.2023.131772

Abstract

Cyanobacterial blooms present great challenges to drinking water treatment and human health. The novel combination of potassium permanganate (KMnO₄) 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/KMnO₄. Cell inactivation was significantly improved by UV/KMnO₄ treatment, compared to UV alone or KMnO₄ alone, and cells were completely inactivated within 35 min by UV/KMnO₄ in natural water. Moreover, effective degradation of associated microcystins was simultaneously achieved at UV fluence rate of 0.88 mW cm^-2 and KMnO₄ dosages of 3-5 mg L^-1. The significant synergistic effect is possibly attributable to the highly oxidative species produced during UV photolysis of KMnO₄. In addition, the cell removal efficiency via self-settling reached 87.9 % after UV/KMnO₄ 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/KMnO₄ process in cyanobacterial cell inactivation and removal, as well as simultaneous microcystin degradation under practical conditions.

Keywords: Advanced oxidation process; Cyanotoxins; Microcystis aeruginosa; Permanganate; Ultraviolet.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Cyanobacteria*
Humans
Microcystins / metabolism
Microcystis* / metabolism
Potassium Permanganate
Water Purification*

Substances

microcystin
Microcystins
Potassium Permanganate