• 关键词：磷酸铵镁  结晶反应  磷回收  晶体形态

• 基金项目：中国环境科学研究院科技创新基金(No.2004-021);国家人事部留学人员科技择优项目(No.2004-99);国家人事部高层次留学人才回国工作项目(No.2004-2005)

• 袁鹏
• 中国环境科学研究院水污染控制技术研究室, 北京 100012

• 宋永会
• 中国环境科学研究院水污染控制技术研究室, 北京 100012

• 袁芳
• 中国环境科学研究院水污染控制技术研究室, 北京 100012

• 彭剑峰
• 中国环境科学研究院水污染控制技术研究室, 北京 100012

• 摘要：以模拟养猪废水为处理对象,进行了磷酸铵镁结晶小试实验,考察了pH值、NH₄⁺、Mg²⁺、Ca²⁺和CO₃^2-浓度对磷酸铵镁结晶反应的影响;利用扫描电镜-能谱分析仪(SEM-EDX)和X射线衍射仪(XRD)对结晶产物进行了表征.结果表明,磷酸铵镁结晶反应的最佳pH值范围为9.5～10.5;随着NH₄⁺与磷摩尔比的增加,磷的去除率增大;最佳的镁与磷的摩尔比为1.4:1,过高的镁盐投加量对提高反应效率作用不明显;Ca²⁺的存在对磷酸铵镁结晶产物的晶形、纯度均产生干扰,当Ca²⁺增至一定浓度时,反应将生成无定形的磷酸钙沉淀;CO₃^2-的存在会降低磷的去除率,但不影响磷酸铵镁的晶形与纯度.

• Abstract：Using synthetic swine wastewater, small-scale batch experiments were carried out to investigate the effects of pH, ammonium nitrogen concentration, magnesium (Mg) dosage, calcium (Ca) and carbonate (CO₃^2-) concentrations on magnesium ammonium phosphate (MAP) crystallization. The morphology of the crystals obtained was observed with Scanning Electron Microscopy with Energy Dispersive X-ray analysis (SEM-EDX), and the composition of the crystals was analyzed by X-ray Diffraction (XRD). The results show that the optimum pHvalue for MAPcrystallization is in the range of 9.5～10.5; the Premoval efficiency increases with the increase of N: Pmolar ratio; the optimum Mg: Pmolar ratio is 1.4: 1. Excessive Mg dosage does not have an obvious effect on the efficiency of MAPcrystallization. The presence of Ca disturbs the morphology and purity of the MAPproduct. Amorphous calcium phosphate will form when Ca reaches a high enough concentration.CO₃^2- affects Premoval efficiency, but does not obviously affect the morphology and purity of MAP.

• Key words：magnesium ammonium phosphate (MAP)  crystallization reaction  phosphorus recovery  crystal morphology

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