The invention relates to a process for treating effluents (2) circulating between the inlet (4) and the outlet (5) of a reactor (1) consisting in subjecting the effluents to a cold plasma treatment and to the action of a photocatalyzing agent under UV radiation with a view to the production of oxidizing species for the treatment of the effluents. According to the invention the process consists in subjecting the effluents simultaneously to a cold plasma treatment and to the action of a photocatalyzing agent under UV radiation the cold plasma treatment being carried out in an integrated and localized manner within a bed of porous microbeads (9) placed inside the reactor (1) and that carry the photocatalyzing agent making it possible to ensure the generation of oxidizing species and also their diffusion within the bed.
