“…When ozone is dissolved in water it undergoes a series of pH dependent, complex self-decomposition reactions that lead, in part, to the formation of desirable hydroxyl radicals ( • OH). • OH are highly oxidising and non-selective and have been shown to be beneficial to the degradation of recalcitrant compounds [9]. A number of recent papers have proposed enhanced • OH generation from microbubbles as an additional benefit [11,15,18,25,31,23,39].…”