电氧化联用电絮凝深度处理垃圾渗滤液研究

Electrooxidation combined with electrocoagulation process for the tertiary treatment of landfill leachate effluent

为去除不同种类的污染物,采用电氧化与电絮凝联用技术对垃圾焚烧厂渗滤液生化出水进行了深度处理研究,考察了电氧化过程中阳极材料、pH和氯离子以及电絮凝中pH对氨氮、有机物和总磷的去除效果影响。结果表明,阳极材料对氨氮的去除影响较大,钌铱电极作为阳极、电氧化90 min时,废水中的氨氮可全部去除,废水中pH和氯离子浓度可满足电氧化处理的需求,因此无需外加药剂进行预调。pH为9时,电絮凝30 min后有机物和总磷的去除率可分别达到72%和98%。采用电氧化和电絮凝联用后,氨氮、有机物、总磷和粪大肠菌的去除率分别达到99%、80%、98%和100%,出水满足国家垃圾渗滤液排放标准(GB16889-2008),该联用技术在垃圾渗滤液的深度处理上有较好的应用前景。

Electrooxidation combined with electrocoagulation was investigated for the tertiary treatment of landfill leachate effluent to remove various pollutants. The influence of the anode material, pH and chlo- ride ion during electrooxidtion and pH during electrocoagulation on the removal of ammonia, organic mat- ter and total phosphorus was studied. The results show that the anode material played an important role on ammonia removal. Ammonia was removed completely at a RuIr anode after 90 min electrolysis. No extra chemicals were required to adjust the pH and chloride concentration because the pH and chloride ion con- centration in the effluent met the requirement of electrooxidation. At pH = 9, the removal rates of organic matter and total phosphorus reached 72% and 98% , respectively, after 30 min electrocoagulation. Am- monia, organic matter, total phosphorus and fecal coliforms removal efficiency achieved 99.4% , 80% , 98% and 100%, respectively. The effluent after this process met the national discharge standard for landfill leachate （GB16889-2008）. The results show that this combined process demonstrated a good application prospect on the tertiary treatment of landfill leachate.