Microwave-Assisted COD Removal from Landfill Leachate by Hydrogen Peroxide, Peroxymonosulfate and Persulfate

H2O2-based advanced oxidation processes (AOPs) and SO4•−-based AOPs were proved novel and promising techniques in treatment of wasterwater. Microwave (MW)-assisted hydrogen peroxide (H2O2), peroxymonosulfate (PMS) and persulfate (PS) were used to dispose of COD in landfill leachate. Oxidant dosage and chloride concentration were investigated as the major operating conditions. The initial COD is 4062.8 mg/L. It is demonstrated that MW-assisted H2O2, PMS and PS can effectively degrade leachate organics, and the COD removal can reach 43.5%, 80.2%, 97.3% when the oxidant concentration is 0.3 mol/L, respectively. Chloride ion will slightly improve the reaction rate for H2O2 and PS, while a little slow down for PMS, but all the eventual COD removal efficiencies keep stable. Generally speaking, MW-assisted peroxide is a powerful means in degradation of COD in landfill leachate.