Degradation of organics in reverse osmosis concentrate by electro-Fenton process

► Remove organic pollutants from RO concentrate by electro-Fenton using graphite-felt as cathode. ► Using this cathode, H2O2 could be effectively generated over 150 mg/L in 3 h. ► The performance and energy consumption were optimized by some operating parameters. ► Electro-Fenton was feasible for RO concentrate treatment for its cost-effectiveness.