次氯酸钠氧化法去除电镀废水中的氨氮

Removal of ammonia nitrogen from pretreated electroplating wastewater by oxidation with sodium hypochlorite

以次氯酸钠为氧化剂,对预处理过的实际电镀废水中的氨氮进行处理。研究了NaClO投加量、进水pH、曝气量和搅拌方式对氨氮去除效果的影响。结果表明,曝气量和搅拌方式对氨氮去除效果的影响不大。较适宜的工艺条件为:NaClO溶液(有效氯含量6%)50 mL/L,pH 1.50,曝气量0.40 L/min。经本工艺处理的出水氨氮符合国标要求,说明采用次氯酸钠氧化法去除电镀废水中的氨氮可行。

Sodium hypochlorite was used as an oxidant to treat the ammonia nitrogen in a pretreated electroplating wastewater. The effects of NaC10 dosage, influent pH, aeration rate, and agitation method on the removal efficiency of ammonia nitrogen were studied. It is shown that aeration rate and agitation method have insignificant impact on the removal of ammonia nitrogen. The suitable process parameters are： NaC10 （available chlorine 6%） 50 mL/L, pH 1.50, and aeration rate 0.40 L/rain. The content of effluent ammonia nitrogen after treatment by the given process meets the national discharge standard, illustrating that using sodium hypochlorite-oxidation method to remove the ammonia nitrogen in electroplating wastewater is practicable.