In-situ generation of bifunctional reagents via Al/C microelectrolysis for efficient coagulation–Fenton oxidation treatment of leachate MBR effluent

Coagulation–Fenton oxidation stands as a prevalent method for organic pollutant removal from MBR effluent in landfill leachate. However, its dependence on intricate coagulant preparation and hazardous H 2 O 2 handling presents challenges in logistics. Herein, a novel Al 0 /C–N, Cl composite was developed via high-energy ball milling and high-temperature sintering, which facilitates in situ generation of H 2 O 2 and aluminum salt coagulant upon stirring in oxygen-containing aqueous solutions. Under conditions of 2 g/L Al 0 /C–N, Cl and initial pH 9, H 2 O 2 production achieved 459 mg/L within 1 h, yielding an Al 3+ /H 2 O 2 bifunctional reagent. Subsequent coagulation in MBR effluent and Fenton oxidation achieved removal efficiencies of 85.5 %, 76.4 %, and 99.3 % for UV 254 , total organic carbon, and chromaticity, respectively. The efficient degradation of refractory fulvic-like substances was obtained from this novel “coagulation–Fenton” hybrid process without additional coagulants and H 2 O 2 . These results illustrated that the hybrid process is a promising and efficient technology for the advanced treatment of landfill leachate.