A non-thermal oxygen plasma(O_2~+ and O_3) was produced by ionization and dissociation oxygen by a strong ionization discharge, and it was injected into a reaction tower of wastewater treatment for the degradation of recalcitrant organic pollutants in the wastewater. Four key plasma reactions took place in the reaction tower. Firstly, O_2~+ among non-thermal oxygen plasma reacted with H_2O molecule to form trace hydroxyl radicals(·OH). Secondly, an initiator(HO_2·) with high reaction rate constant was gener...