Treatment of Landfill Leachate by Microwave-enhanced Fenton Oxidation

To address the high cost and low efficiency in treatment of refractory organics in landfill leachate,the treatment efficiency of landfill leachate by microwave-enhanced Fenton oxidation was studied,and the influences of microwave heating time,microwave power,dosage of catalyst,pH and Fenton reagent dosage on the treatment efficiency were investigated.The comprehensive effect of each factor was studied by orthogonal test.The results show that at pH of 2.5,H2O2 of 6.25 mL/L,FeSO4·7H2O of 3.972 g/L,heating time of 5 min and activated carbon dosage of 5 g/L,the COD in landfill leachate can be reduced from 1 652 mg/L to 205 mg/L and the removal rate is 87.5%,attaining the secondary discharge standard for landfill leachate.The influence degree of factors on the treatment efficiency is: dosage of Fenton reagent pH dosage of catalyst microwave heating time.Compared with Fenton oxidation,the microwave-enhanced Fenton oxidation can save chemicals dosage by 50%,thus reducing the treatment cost.