Fenton法处理类长填龄渗滤液的氧化和絮凝作用

采用Fenton法对难降解的类长填龄渗滤液进行处理，考察其氧化和絮凝作用对有机物去除的贡献. 结果表明:以COD_Cr去除率最大为目标，试验在最优条件下，c(H₂O2)/c(Fe2+)为7.0，Fe2+投加量(c(Fe2+))为60　mmol/L，pH为3.0，此时COD_Cr总去除率为60%；其中氧化作用去除率为44%，氧化和絮凝作用的效率比为2.7. c(H₂O₂)/c(Fe2+)，c(Fe2+)和pH的变化对氧化和絮凝作用有明显影响，氧化作用对COD_Cr去除率随H₂O₂投加量增大而增大.絮凝作用对COD_Cr的去除率不仅受Fe2+投加量直接影响，随其增加而增大；还间接受氧化作用去除率影响，氧化作用去除率越大，剩余有机物大分子所占比例降低，絮凝作用对有机物的去除率越低. 

Roles of Oxidation and Coagulation during Fenton Treatment of Mature Leachate

Fenton method was applied in the treatment of non-degradable mature landfill leachate. The indicator of COD_Cr was used to determine the roles ofoxidation and coagulation in reducing the refractory organics of mature leachate. Theresults showed that, with the purpose of achieving maximum COD_Cr removal rate, under the optimal condition of c(H₂O₂)/c(Fe2+)7.0, c(Fe2+)60 mmol/L and pH3.0, 60% of total COD_Cr was removed, of which 44% was removed by free radical oxidation, and the ratio of COD_Cr removal by oxidation to coagulation was 2.7. The changes in action conditions (c(H₂O₂)/c(Fe2+), c(Fe2+)　and pH) have significant effects on the relationship of oxidation andcoagulation. The efficiencies of COD_Cr removal by oxidation increases by increasing the dosages of H₂O₂. Meanwhile, not only were the efficiencies ofCOD_Cr removal by coagulation influenced directly by ferrous dosages, which increased by adding the ferrous dosage, but also they could be influenced by oxidation efficiencies indirectly. The high oxidation efficiency means high fraction of low molecular weight organics residual in the water, resulting in the decrease of COD_Cr removal efficiency by coagulation.