Pretreatment of landfill leachate by Fenton process

Fenton process was tried to pretreat landfill leachate in this paper.The effect of operating conditions such as initial pH,H2O2 dosage,FeSO4-7H2O dosage,H2O2 to Fe2+ molar ratio,and reaction time on the efficacy of Fenton process was investigated.The optimum operating conditions of Fenton process were as follows: initial pH was around 3.0,H2O2 dosage was 5.0 mL·L-1,FeSO4-7H2O dosage was 3.48 g·L-1,the molar ratio of H2O2 to FeSO4-7H2O was 4:1,and reaction time was 1.5 h.The landfill leachate COD after Fenton process under the optimum conditions decreased to 5220 mg·L-1 and COD removal reached 57.8%.Gel permeation chromatography(GPC) and three-dimensional fluorescent spectroscopy(3DEEM) results indicated that large molecular humic matters,the major components in landfill leachate,were removed and decomposed into small molecular compouds after Fenton process.