Treatment of mature landfill leachate by internal micro-electrolysis integrated with coagulation: A comparative study on a novel sequencing batch reactor based on zero valent iron

► Specifically-designed SIME reactor for treatment of mature landfill leachate. ► Excellent removal efficiencies of COD (86.1%), color (95.3%), and HA (81.8%). ► Combination effect of IME without aeration and IME with aeration. ► Optimal pH of 5, Fe/C of 1:1, gas flow rate of 80 L h−1, and H2O2 of 100 mg L−1.