MAP结晶法去除猪场废水中氮、磷元素的工艺条件

    Technological Conditions for Application of MAP Crystallization Method to Remove Nitrogen and Phosphorus From Swine Farm Wastewater

      摘要
    • 摘要: 以实际猪场废水为研究对象,采用MgCl2·6H2O和Na2HPO4·12H2O为沉淀剂,对磷酸铵镁(magnesiumammonium phosphate,MAP)结晶法去除猪场废水中氮、磷元素的3种工艺条件进行了系统研究。结果表明:只调节pH工艺,最佳pH值范围为9.0~10.0;通过曝气可提高废水pH,曝气时间以60 min为宜,可提升废水pH值至8.9,铵态氮、磷和总氮去除率分别为16.8%、78.4%、21.4%;补加镁源工艺可有效提高磷去除率,最佳pH范围为9.0~10.0,Mg∶P(摩尔比)为1.6,磷去除率为95.4%;同时补加镁源和磷源工艺,可获得较高的铵态氮去除率,最佳pH值为9.5,P∶N(摩尔比)为1.0,Mg∶N(摩尔比)为1.1,铵态氮去除率为87.4%,余磷质量浓度小于10mg.L-1。

       

      Abstract: A systematic study was carried out to explore technological conditions for application of the magnesium ammonium phosphate(MAP) crystallization method using MgCl2·6H2O and Na2HPO4·12H2O as precipitant to remove N and P from wastewater of swine farms.It was found that the technology of regulating pH of the wastewater only called for an optimum pH range of 9.0-10.0,and aeration for 60 minutes as recommended to raise pH of the wastewater up to 8.9.Then it could remove 16.8%,78.4% and 21.4% of the ammonium-nitrogen,phosphorus and total nitrogen,respectively,in the wastewater.The magnesium-amending technology could effectively increase the phosphorus removal rate up to 95.4%,but it called for an optimum Mg∶P molar ratio of 1.6 and an optimum pH range of 9.0-10.0.The magnesium-and-phosphate-amending technology could have an ammonium-nitrogen removal rate as high as 87.4% and remove P till it was less than 10 mg·L-1 in concentration when the wastewater was regulated up to 9.5 in pH,1.0 in P∶N molar ratio and 1.1 in Mg∶N molar ratio.

       

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