Degradation of cyanobacteria toxin by advanced oxidation processes

The ozonation treatment was successfully described by second-order kinetics model, with a first-order with respect to the concentration of either ozone or toxin. At 20 °C, with initial concentration of MC-LR of 1 mg/L, the overall second-order reaction rate constant ranged from 6.79 × 104 to 3.49 × 103 M−1 s−1 as the solution pH increased from 2 to 11. The reaction kinetics of the other AOPs (O3/H2O2, O3/Fe(II), and Fenton), were fitted to pseudo first-order kinetics. A rapid reaction was observed to took place at higher initial concentrations of O3, H2O2 and Fe(II), and higher temperatures. At pH 3, initial concentration of toxin of 1 mg/L, the pseudo first-order rate constant, achieved by Fenton process, was in order of 8.76 ± 0.7 s−1.