The present invention relates to a treatment process applicable to degrade or transform organic and inorganic pollutants, commonly found in industrial wastewaters, contaminated aquifers and gas emissions, in which reduction or oxidation reactions (e.g. redox reactions) are involved. The treatment concept comprises reactors in which catalysts, with redox mediating properties, have been immobilized on ion exchange resins in order to improve and accelerate the transformation of priority pollutants by chemical or biological means.