The removal of organic dyes in printing and dyeing wastewater has been a difficult problem in water treatment technology for a long time.Electricity/potassium permanganate/peroxymonosulfate(EC/PM/PMS)system can efficiently degrade refractory organic dyes,such as reactive yellow K-RN.However,the degradation mechanism,especially the activation mechanism of Mn in relation to PMS,remains unclear.Therefore,this paper studied the types and production pathways of active substances in EC/PM/PMS system,and determined the action mechanism of Mn and the activation process of PMS during printing and dyeing wastewater treatment.Results showed that EC/PM/PMS system is a composite system including free radical oxidation and non-free radical oxidation.During this process,PMS activates Mn(Ⅴ),Mn(Ⅵ)and amorphous manganese dioxide,resulting in the reduction of PM.In addition,reactive oxygen radical oxidation is the main degradation path accounting for 95.3％,while electrode direct oxidation and non-free radical oxidation account for 2.1％and 2.6％,respectively.
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