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内循环泡沫浮选塔间歇分离含镉废水

Keywords: 含镉废水,去除率,内循环塔,协同效应,间歇操作

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Abstract:

为强化气液传质,提出了泡沫塔对泡沫分离性能影响的研究,并为此设计了在泡沫塔内加内循环套筒的泡沫分离塔。结果表明,与没有加内循环套管的常规塔相比,通过FT-IR检测分析,内循环塔性能明显优于常规塔。在间歇分离条件下,研究在内循环塔内处理含镉废水,探讨pH、LAS、停留时间、气泡大小等因素对镉去除率的影响。确定最佳处理条件为:pH=4.0,LAS=65mg/L,塔内停留时间大于20min,气体流量为250mL/min,在此最佳实验条件下,镉的去除率可达99.9%以上,此时的镉质量浓度为10mg/L。表面活性剂协同效应实验结果表明,在加入阳离子表面活性剂十二烷基二甲基苄基溴化铵时,会形成一个二元表面活性剂协同效应区。

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