摘要
实验采用磷酸氨镁沉淀法(MAP法)去除垃圾渗滤液中的高浓度氨氮。通过对MgC l2+Na2HPO4、MgSO4+Na2HPO4、MgO+Na2HPO4、MgC l2+NaH2PO4、MgSO4+NaH2PO4和MgO+NaH2PO4等六种组合药剂去除氨氮效果的分析比较,得出MgC l2+Na2HPO4对氨氮的去除效果最好。继而对该组合药剂去除氨氮的影响因素进行了优化。结果表明:pH为9.0,反应时间为50m in,n(Mg2+)∶n(NH4+)∶n(PO43-)为1.2∶1∶0.9时,氨氮可由原来的2100mg/L降低到317mg/L,去除率达84.9%.
In this study the Magnesium Ammonium Phosphate Process （MAP） was adopted to remove the ammonia-nitrogen of landfill leachate. Based on the precipitation experiments with different combination of chemicals containing elements of magnesium and phosphate including MgCl2＋Na2HPO4^-、MgSO4＋Na2HPO4、MgO＋Na2HPO4、MgCl2＋NaH2PO4、MgSO4＋NaH2PO4 and MgO＋NaH2PO4, comparison of the ammonia-nitrogen removal effect was analyzed. The result indicated that MgCl2 ＋ Na2HPO4 had the best removal effect. Then the main factors affecting the effect of ammonia-nitrogen removal was optimized. The results indicated that at conditions ofpH9.0, reaction time lasting 50 min and n （Mg^2＋） ：n （NH4^＋） ：n （PO4^3-） = 1.2： 1：0.9, the ammonia nitrogen was reduced from 2100 to 317mg/L with removal rate up to 84. 9% .
出处
《四川环境》
2009年第1期24-26,32,共4页
Sichuan Environment
关键词
氨氮
垃圾渗滤液
鸟粪石
Ammonia-nitrogen
landfill leaehate
magnesium ammonium phosphate
