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基于响应面法优化MAP法处理垃圾渗滤液工艺的研究

Keywords: 响应面分析法,垃圾渗滤液,氨氮,化学沉淀法,晶形

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Abstract:

利用单因素实验以及响应面法(responsesurfacemethodology,RSM),对磷酸铵镁法(magnesiumammoniumphosphate,MAP)去除垃圾渗滤液氨氮的影响因素进行了分析和探讨。考察了pH值为8.0~11.0、n(Mg)∶n(N)摩尔比为0.8~1.6、n(P)∶n(N)摩尔比为0.8~1.3条件下,分析氨氮去除率的变化,用Design-Expert软件处理实验数据,得到了二次响应曲面模型以及优化的水平值。基于经济和操作简便性的考虑,pH值由优化水平的8.3调整为9.5,n(Mg)∶n(N)、n(P)∶n(N)摩尔比取优化水平分别为1.40、1.19,氨氮去除率平均值为92.2%,虽然该条件比最佳条件下的氨氮去除率降低了2个百分点,但从操作的难易程度以及经济性方面,体现了其优势。通过X衍射与电镜扫描分析沉淀物质的成分与晶形,表明大部分沉淀物质为磷酸铵镁。

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