Ozone is the triatomic form of oxygen formed naturally during lightning strikes and anytime an electric arc is formed. It is a very unstable compound and must be produced at the same time it is needed, usually by ultraviolet excitation and corona discharge. It isn't effective in treating slurries, sludges, solids, organic solvents, or tars.
Before use, consider the possibility that ozone will oxidize other stream components that didn't need treatment. Excess ozone, (that is, ozone not consumed in the reaction) must be catalytically decomposed since release isn't permitted.