During the AOP, oxidation is largely brought about by OH-radicals. These radicals are very reactive compounds or atoms that have a very short half-life (10 μS at a 10-4 M concentration) [6]. This causes an OH-radical to react non-selective and directly with dissolved solids. These radicals can be initiated into the water by means of a certain type of substance (activator). For an AOP, one often uses ozone combined with hydrogen peroxide (H2O2), or ozone and UV-light, or hydrgen peroxide and UV-light. In the reaction mechanism shown below, ozone is combined with hydrogen peroxide.
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