摘要
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 ) 1 5.70 g/L,NH3-N 2 .2 6g/L)通过 UASB(上流式厌氧污泥床 )反应器 ,在 37℃ ,水力停留时间 6.6d,平均有机物负荷速率为 2 .37g/( 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 p H为 6.0 ,Fenton试剂的加入量分别为 2 0 0 mg/L H2 O2 和 30 0 mg/L Fe2 + ,最后出水的平均 COD可降至 4 47mg/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 1 4 %是由该过程产生的羟基自由基氧化去除 ;H2 O2 和 Fe2 + 具有很强的协同作用效果 ,去除 1 .0 0 g COD需要加入 H2 O2 和 Fe2 + 的量分别为 0 .1 8和 0 .2 8g.并对
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 (NH 3-N), was first treated in a UASB (upflow anaerobic sludge blanket) reactor at 37 ℃. The process on average removed 90 4% of COD with 6 6 days of hydraulic retention at an organic loading rate of 2 37 g/(L·day) COD. The UASB effluent was further treated by the Fenton coagulation process using H 2O 2 and Fe 2+ . Under the optimal condition of 200 mg/L H 2O 2 and 300 mg/L Fe 2+ and initial pH 6 0, 70% of residual COD in the UASB effluent was removed, of which 56% was removed by coagulation/precipitation and only 14% by free radical oxidation. It is obvious that H 2O 2 and Fe 2+ had a strong synergistic effect on coagulation. The average COD in the final effluent was 447 mg/L. Removing each gram of COD required 0 18 g of H 2O 2 and 0 28 g of Fe 2+ , the Fenton coagulation process was discussed in this paper.
出处
《应用化学》
CAS
CSCD
北大核心
2001年第5期408-411,共4页
Chinese Journal of Applied Chemistry
基金
香港政府研究基金资助项目! (70 98/99E)
