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Technological Conditions for Application of MAP Crystallization Method to Remove Nitrogen and Phosphorus From Swine Farm Wastewater
Author(s): 
Pages: 268-272
Year: Issue:  3
Journal: Rural Eco-Environment

Keyword:  猪场废水 MAP结晶法 去除率;
Abstract: 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。
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