Micropollutants Removal from Retentates Generated in Ultrafiltration and Nanofiltration Treatments of Municipal Secondary Effluents by Means of Coagulation, Oxidation, and Adsorption Processes

•Ozone exhibited better pollutants and UV254 removal than chlorine and permanganate.•0.5mgO3mgDOC−1 led to an important elimination of fast ozone-reacting compounds.•Iron coagulation was more efficient than alum and removed high MW compounds.•PAC could effectively eliminate hydrophobic and aromatic contaminants.•Coupling coagulation with ozone significantly improved contaminants and EfOM removal.