磷酸铵镁沉淀法去除垃圾渗滤液中氨氮的实验研究

A new method for removing NH3-N in landfill leachate——MAP precipitation

叙述了磷酸铵镁沉淀法(MAP法)去除垃圾渗滤液中氨氮的基本原理,分析了MAP法对氨氮的去除效果及其产物中的重金属含量,对比了不同的镁盐及不同的反应时间对氨氮的去除效率。结果表明,该方法对氨氮的去除效率高,产物中重金属的含量低。同时,选择MgO比选择MgC l2具有更好的氨氮去除综合优势,理想的氨氮去除条件为pH=9.5,Mg∶N∶P=1∶1∶1。

The principle of the removal method （MAP precipitation） for NH3-N in landfill leachate was narrated and the NH3-N removal effect and heavy metal contents in MAP precipitation were analysed. At the same time, the NH3-N removal effects of different magnesium compounds and at different times were compared. The results indicated that it had a high NH3-N removal effect and low heavy metal content in MAP precipitation, and it had more advantages to choose magnesia than magnesium chloride in NH3-N removal effect. The ideal conditions of NH,-N removal method are pH =9.5,Mg： N： P = 1： 1： 1.