The leachate from a Hong Kong landfill, containing 15.70 g/L of chemical oxygen demand(COD) and 2.26 g/L of ammonia nitrogen (NH3-N), was first treated in a UASB (upflow anaerobicsludge blanket) reactor at 37 ℃. The process on average removed 90.4% of COD with 6. 6 days ofhydraulic retention at an organic loading rate of 2. 37 g/(L · day) COD. The UASB effluent wasfurther treated by the Fenton coagulation process using H2O2 and Fe2+. Under the optimal condition of200 mg/L H2O2 and 300 mg/L Fe2+ and initial pH 6.0, 70% of residual COD in the UASB effluentwas removed, of which 56% was removed by coagulation/precipitation and only 14% by free radicaloxidation. It is obvious that H2O2 and Fe2+ had a strong synergistic effect on coagulation. The averageCOD in the final effluent was 447 mg/L. Removing each gram of COD required 0. 18 g of H2O2 and0.28 g of Fe2+, the Fenton coagulation process was discussed in this paper.%针对香港卫生填埋厂垃圾渗沥水提出了化学法与厌氧生物法结合的废水处理工艺．垃圾渗沥水(内含COD(化学需氧量)15．70 g/L，NH3-N 2．26 g/L)通过UASB(上流式厌氧污泥床)反应器，在37℃，水力停留时间6．6 d，平均有机物负荷速率为2．37 g/(L·d)COD的条件下进行厌氧生物消化，对COD的平均去除率可达90．4％．UASB出水采用Fenton化学混凝工艺进行深度处理，在最佳实验条件下，初始pH为6．0，Fenton试剂的加入量分别为200 mg/L H2O2和300 mg/LFe2+，最后出水的平均COD可降至447 mg/L．对Fenton混凝过程的深入研究结果表明，在约有70％的残留在UASB出水中的COD物质去除中，其中56％的COD去除是借助化学混凝/沉淀作用，另外14％是由该过程产生的羟基自由基氧化去除；H2O2和Fe2+具有很强的协同作用效果，去除1．00g COD需要加入H2O2和Fe2+的量分别为0．18和0．28 g．并对Fenton化学混凝过程进行了较为系统研究．
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