磷酸铵镁沉淀法处理制药废水试验研究

制药废水由于制药原料化学纯度较高，废水中常含高浓度氮、磷污染物，采用磷酸铵镁沉淀法可同时回收两种元素不仅可以有效同时去除两种污染物，而且可以得到附加值较高的磷酸铵镁盐，因此本研究用磷酸铵镁化学沉淀法小试实验处理制药废水，讨论了磷酸铵镁沉淀法pH、晶种、初始浓度对P0^3- 4和NI-14同时去除的影响。试验结果表明：投加镁盐，在pH=9．5的条件下，可去除90％PO^3- 4，同时可去除15％NH4，在Po^-3 4和NH4浓度较低时，投加晶种可使Po；一去除率提高20％，该法渴望为制药废水处理提供创造经济效益的经验。

Study on Treatment of Pharmaceutical Wastewater by Struvite Crystallization

Pharmaceutical wastewater contains high concentrations of phosphorus（P） and nitrogen（N） due to high purity and maximum chemical resistance. P recovery from wastes has become an inevitable process, occurred naturally, which had caused sub stantial operational problems in wastewater treatment. A pilot - scale experiment was carried out for nutrients removal and recovery from pharmaceutical wastewater by struvite crystallization. In the pilot plant, struvite crystallization is used to treat the wet oxidized pharmaceutical wastewater, which has high concentration of phosphate and ammonia - nitrogen. The relationship between precipi tant, pH, seed crystal and removal ratio of phosphate and ammonia - nitrogen is discussed. The research suggests that more than 90% p034- and 15% NH~＋ can be removed when equal amount of Mg2~ is added at an optimal pH of 9. 5, meanwhile a certain a mount of NH~＋ get removed too. Addition of seed crystal promotes the removal of 20% P043- and impact the configuration of struvite crystal when the concentration of phosphate and ammonia - nitrogen is low. It makes difference when the concentration is high.