Abstract: Using different precipitation reagent about magnesium ammonium phosphate (MAP) process, the result of removal of nitrogen and phosphorus was discussed. Some results were compared,such as the removal rate of PO₄^3--P and the removal rate of NH₃-N, the quantity of PO₄^3--P and the quantity of NH₃-N in the treated water,weight and composition of precipitation,conductivity of treated water. When high ammonia-nitrogen sweage was treated, better precipitation reagent was Na₃PO₄·12H₂O+MgCl₂·6H₂O and Na₃PO₄·12H₂O+MgSO₄·7H₂O. When high phosphate sweage was treated, better precipitation reagent was NH₄Cl+MgCl₂·6H₂O and NH₄Cl+MgSO₄·7H₂O. MAP was confirmed by the scanning microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS).

Key words: magnesium ammonium phosphate, precipitation reagent, removal rate of ammonia-nitrogen, removal rate of phosphate

摘要： 探讨了磷酸铵镁法中不同沉淀剂的脱氮除磷效果,比较了氨氮去除率、磷酸盐去除率、残氮量、残磷量,沉淀物质质量和组成,处理液的电导率。综合考虑了各方面因素得出处理高浓度氨氮废水的较佳的沉淀剂为Na₃PO₄·12H₂O+MgCl₂·6H₂O和Na₃PO₄·12H₂O+MgSO₄·7H₂O,处理高浓度磷酸盐废水的较佳的沉淀剂为NH₄Cl+MgCl₂·6H₂O和NH₄Cl+MgSO₄·7H₂O.并对磷酸铵镁沉淀进行了X-衍射光谱和扫描电镜表征。

关键词: 磷酸铵镁, 沉淀剂, 氨氮去除率, 磷酸盐去除率