Degradation and detoxification of 4-nitrophenol by advanced oxidation technologies and bench-scale constructed wetlands

► We studied the treatment 4NP by CWs and advanced oxidation technologies. ► In CWs biodegradation and adsorption were the main removal pathways. ► The 4NP removal order was: CWs < TiO2-photocatalysis < Fenton-photoFenton. ► The combination of CWs with photocatalysis is proposed as a convenient treatment.