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反渗透处理稀土氨氮废水试验研究

Keywords: 反渗透,回收率,脱盐率,氨氮

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Abstract:

根据稀土冶炼厂排放的碳铵沉淀洗涤废水的水质情况,采用NH4Cl和NaCl模拟废水进行了反渗透可行性对比实验。模拟实验发现,在相同条件下反渗透对NaCl较NH4Cl有着更高的去除率,而NH4Cl相对NaCl则有着更高的产水速率。实际废水试验结果表明,在恒定操作压力范围内回收率为65%的条件下,NH4Cl浓度为2.85g/L的碳铵沉淀洗涤废水经反渗透处理其NH4Cl去除率为77.3%,可作为氨氮废水的预处理。对该废水处理成本进行了分析,得出其约为2.7元/m3,比相近浓度氨氮废水的氨吹脱处理成本节省约26%。

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