【作者】 王芳；

【导师】 娄金生；

【作者基本信息】 南华大学 ， 市政工程， 2007， 硕士

【摘要】 在城市垃圾填埋过程中产生的渗滤液是一种污染很强的高浓度有机废水，成分复杂且水质变化大，废水中COD_Cr、氨氮、重金属等含量高，可生化性差，如处理不当会对填埋场周围环境造成严重污染，所以对垃圾渗滤液进行经济高效处理是垃圾填埋处理技术中的一大难题。本文对垃圾渗滤液采用微电解-化学沉淀-吸附法联合处理，试验期间COD_Cr浓度变化范围是2500 mg／L-3000 mg／L，氨氮浓度变化范围是1200 mg／L-1500mg／L。试验结果如下：微电解处理垃圾渗滤液在最佳试验条件初始pH=3.5、HRT=80min的情况下，COD_Cr去除率为29.93％；Fenton试剂氧化处理垃圾渗滤液在最佳试验条件H₂O₂投加量13g／L、初始pH=3.0、反应时间=15min的情况下，COD_Cr去除率为79.38％；磷酸铵镁（MAP）化学沉淀法处理垃圾渗滤液在最佳试验条件pH=9.0、Mg∶N∶P=1.2∶1∶1.2（摩尔比）、反应时间15min的情况下，氨氮去除率达到98％以上，残磷量为26.44mg／L，为下一步生化处理创造了条件；吸附法处理垃圾渗滤液在最佳试验条件为膨润土吸附剂投加量24g／L、初始pH值=7.0、反应时间=60min的情况下，COD_Cr和氨氮去除率分别达到23.78％、39.22％。垃圾渗滤液经微电解-化学沉淀-吸附联合处理后，COD_Cr浓度由2935.67mg／L降至330.85mg／L，COD_Cr总去除率为88.73％；氨氮总去除率达到99.38％，氨氮浓度由1343.92mg／L降至8.25mg／L。本研究为物化法处理垃圾渗滤液的工程应用提供了试验数据和设计参考。更多还原

【Abstract】 Leachates from municipal solid waste landfill sitesare often defined asheavily polluted wastewaters. Leachates may contain large amounts of organic matter,where COD_Cr consist an important group, as well as ammonia-nitrogen, heavy metals.Landfill leachates have been identified as potential sources of ground and surfacewaters contamination, if they are not safely disposed. So it is a hard work to properlytreat the landfill leachates.The research of applying microelectrolysis-chemical precipitation-adsorptionmethod to treat the landfill leachate was introduced in this paper. The concentration ofCOD_Cr and ammonia-nitrogen of the landfill leachate were 2500-3000mg/L,1200-1500mg/L. The optimal conditions were got during the experiments. The testresults show:The removal rate of COD_Cr is 86.46％at the HRT of 80min, the pH of 3.5 duringthe micro-electrolysis. The removal rate of COD_Cr is 79.38％at the H₂O₂ dosage of13g/L, the pH of 3.0, the reaction time of 15 min during the Fenton reagent oxidation.When pH at 9.0, magnesium ammonium and phosphate molar ratios of 1.2:1:1.2, andthe reaction time is 15min, the removal efficiency of ammonia-nitrogen is above 98％and the residual phosphate is 26.44 mg/L during the MAP chemical precipitation. Theremoval rate of COD_Cr and ammonia-nitrogen is 23.78％and 39.22％respectively atthe bentonite dosage of 24g/L, the pH of 7.0, the reaction time of 60 min during theadsorption.The COD_Cr and ammonia-nitrogen can be decreased to 330.85 mg/L and 8.25mg/L respectively by the microelectrolysis-chemical precipitation-adsorption method.The total removal rate of COD_Cr and ammonia-nitrogen is 88.73％and 99.38％respectively.This study provided test data and design reference for engineering practice totreat the landfill leachate by microelectrolysis-chemical precipitation-adsorption.更多还原