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Study on Coupled Oxidation and Microwave Process in Treating Urban Landfill Leachate by Fenton and Fenton-Like Reaction

In study, Microwave Irradiation enhanced Fenton-Like Process was introduced as a novel technology in the treatment of Landfill Leachate containing refractory organic matters. The sample leachate with initial COD loading of 11434 ~12067 mg•L−1 was collected from the Laohuchong (Shenyang, China) City Landfill. Fenton (FeSO4/H2O2) and Fenton-like (iron tailings/H2O2) reagents coupling with Microwave Irradiation were both studied. The Microwave Irradiation enhanced Fenton-Like Process was conducted under the optimal conditions as follows: 480W of microwave power, 3 min of radiation time, 3.0 of initial pH, 100mL•L−1 of H2O2 and 2g•L−1 of iron tailings. The removal rates of leachate samples with initial COD =11928 mg•L−1 using 1.5g.L-1 FeSO4 and 2.0g.L-1 iron tailings are 45.1% and 42.3% respectively on the condition of 320W MW radiated for 3 min at room temperature. The highest removal rate of the MW Fenton-Like Process is about 46% under the optimum conditions. It demonstrates the Fenton-Like reagent can be used as a substitution of Fenton reagent in Landfill Leachate applications which has extensive application prospect and extraordinary significance in aspects of resource utilization of waste materials and cost saving.