The characteristics of water quality had significant effects on the oxidative degradation of O3/H2O2 system.In this study,iron supported on activated carbon catalyst was prepared firstly,and then the treatment of landfill leachate by O3/H2O2/catalyst system was analyzed,especially the roles of H2O2 in the oxidation of landfill leachate by O3/H2O2 system.The results showed that at room temperature,when the dosage of the catalyst was 1.0g,the removal rate of COD from the landfill leachate reached 79.8% after 50 ml of the landfill leachate（pH=3）was oxidized by O3（its flow rate was 5g/h）for 50 min.If 0.3ml of H2O2 was added to the landfill leachate,the removal rate of COD increased from 79.8%to 88.7%.It showed that the landfill leachate with the characteristics of complex composition and difficult biodegradation could be effectively degraded by the O3/H2O2 system.
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