MAP沉淀法去除渗滤液中低浓度氨氮  

Treatment of low concentration ammonium nitrogen in landfill leachate with MAP precipitation

作　　者：吴彦瑜[1,2] 彭晓春[1] 陈志良[1] 董家华[1] 周少奇[2] 

机构地区：[1]环境保护部华南环境科学研究所,广州510655 [2]华南理工大学环境科学与工程学院,广州510006

出　　处：《环境工程学报》2013年第3期925-930,共6页Chinese Journal of Environmental Engineering

基　　金："十一五"国家科技支撑计划项目(2007BAC16B08);环保公益性行业科研专项(201009063;2011467024);公益性科研所基本科研业务专项(ZX-201106-089;20603021001-2)

摘　　要：考察了pH值、搅拌时间、Mg∶N和N∶P摩尔比对鸟粪石化学沉淀法(MAP)去除垃圾渗滤液中低浓度氨氮的影响,使用Design Expert 7.1.3进行3水平4因素响应曲面中心复合设计优化实验,并通过二次多项式拟合和参数优化,得到:当pH为10,搅拌时间为30 min,Mg∶N摩尔比为1.41,N∶P摩尔比为1.34时,氨氮去除率(Y1)可以达到最大值71.2%,体系中的残留PO34--P浓度(Y2)趋近于零,达到我国《生活垃圾填埋场污染控制标准排放标准》的排放标准。此外,X射线衍射图谱的分析表明大部分沉淀物质为磷酸铵镁。The effects of solution pH value, stirring time, Mg： N, and N： P molar ratios on removals of low ammonium nitrogen concentration were investigated using struvite precipitation. A quadratic statistical modeling was applied to investigate the improvement availability for high-level removal of ammonium-nitrogen. The three- level-four-variable central composite design （CCD） was proposed by Design Expert Software （ version 7. 1.3）. The fit summary suggested that the quadratic models were the most appropriate one among all of the polynomial models to simulate NH4-N removal and remaining PO34--P concentration. Under optimum conditions of pH 10, Mg： N molar ratio of 1.41, N： P molar ratio of 1.34 no PO4^3-P left in the treated leachate. The treated pattern indicated that the main precipitated crystal , the highest NH4-N removal 71.2% was achieved and nearly effluent met the new discharge standards of China. The XRD was struvite.

关 键 词：鸟粪石 渗滤液 氨氮 

分 类 号：X703.1[环境科学与工程—环境工程]