Abstract
The inhibition of Microcystis aeruginosa in water with UV-C irradiation was investigated. Results revealed that 84% of M. aeruginosa were removed on the 5th day after UV-C irradiation at a dose of 2,117 mJ/cm2. The SEM images of irradiated M. aeruginosa cells showed evidence of injury. However, the presence of CH3OH, thiourea, and decreased the UV-C irradiation efficiency. Acidic conditions were more conducive to M. aeruginosa removal than neutral or alkaline conditions. H2O2 in the mM level was added into the M. aeruginosa solution to investigate the removal efficiency, and the results indicated that 94% of M. aeruginosa were removed. The phycocyanin photosynthetic pigment content in M. aeruginosa cells decreased with the increase of UV-C irradiation dose. Low UV-C irradiation doses enhanced the activity of superoxide dismutase (SOD) in the M. aeruginosa cells, whereas the SOD activity decreased with high doses.
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