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Evaluation of ultraviolet/peracetic acid to degrade M. aeruginosa and microcystins -LR and -RR
Journal of Hazardous Materials  (IF10.588),  Pub Date : 2021-09-27, DOI: 10.1016/j.jhazmat.2021.127357
Husein Almuhtaram, Ron Hofmann

The reactivity of peracetic acid (PAA) alone, and PAA exposed to ultraviolet radiation (UV), was investigated on Microcystis aeruginosa cells, and on microcystin-LR and -RR. Reaction rates between PAA and MC-LR (k = 3.46 M−1 s−1) and MC-RR (k = 2.67 M−1 s−1) were determined in an unbuffered acidic solution, and they are approximately 35–45 times lower than a previously reported reaction rate between MC-LR and chlorine at pH 6. Peracetic acid reacted with M. aeruginosa cells as a function of PAA and cell concentrations, with 10 mg/L PAA resulting in 1-log reduction of total MC-LR within 15 min. Advanced oxidation by UV/PAA readily degraded MC-LR and MC-RR, outperforming UV/H2O2 at pH 7.7 by > 50% on an equimolar basis. Indirect photolysis at this pH is due to OH and organic radicals, as determined by trials in the presence of excess tert-butanol to scavenge OH. The process is less effective when the pH departs from neutral conditions (5.9 or 10.6) due to the decreased effects of both radicals. These findings suggest that PAA alone might be a viable option for cyanobacteria and microcystins control in preoxidation applications and that UV/PAA is an effective process for degrading MC-LR and MC-RR at neutral pH.