摘要：

探讨了磷酸铵镁法综合处理磷酸盐工业废水和垃圾渗滤液的可行性。探讨了pH、物质摩尔配比、搅拌速度、反应时间、陈化时间等因素对氨氮和磷酸盐去除效果的影响。实验得出只加MgSO₄·7H₂O处理氨氮质量浓度为2677.34mg/L的垃圾渗滤液和磷酸盐质量浓度为1804.48mg/L的磷酸盐工业废水时的较佳实验条件为:搅拌速度200r/min左右,反应时间20min,pH=9.5,n(Mg):n(P):n(N)=1.5:1.187:1.0。在陈化时间为30min以及上述实验条件下,磷酸盐的去除率为99.53%,处理液中的残磷质量浓度为6.79mg/L,氨氮的去除率为87.56%,残氮质量浓度为76.12mg/L。并对所得磷酸铵镁沉淀进行了X-衍射光谱和扫描电镜分析。

关键词: 磷酸铵镁, 磷酸盐废水, 垃圾渗滤液

Abstract:

The feasibility of the treatment of phosphate wastewater and landfill leachate by magnesium ammonium phosphate(MAP) process are discussed. Some factors, such as pH,molar ratio, reaction time,stirring speed,precipitation time,affecting the result of removal of ammonium and phosphate by MAP process are discussed. When the concentration of NH₃ - N is 2 677.34 mg/L in the landfill leachate and the concentration of phosphate is 1 804.48 mg/L in the phosphate industrial wastewater are treated, only MgSO₄·7H₂O needs to be added. The better treatment conditions are as follows:stirring speed is about 200 r/min, reaction time 20 min, pH 9.5, and n(Mg) : n(P) : n(N) = 1.5 : 1.187 : 1.0. Under these conditions, when the precipitation time is 30 min, the removal ratio of phosphate is 99.53%, the quantity of residual phosphorus in the treated water is 6.79 mg/L, the removal rate of NH₃ - N is 87.56%. and the NH₃ - N in the treated water is 76.12 mg/L. The MAP precipitation obtained has been analysed by X - ray spectroscopy and scanning microscopy.

Key words: magnesium ammonium phosphate, phosphate wastewater, landfill leachate

中图分类号: 

• X703