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倒置A2/O-MBR(平板膜)处理城市污水的中试研究

Keywords: 倒置A2/O-MBR,COD,脱氮除磷,SS,平板膜

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Abstract:

针对城市生活污水,研究了两点进水倒置A2/O-MBR(平板膜)系统(以下简称系统)对COD、NH4+-N、TN、TP、出水SS影响。结果表明,该系统对COD、NH4+-N具有较高的去除率,出水符合GB18918-2002中一级A标准;当混合液回流比为200%时,系统出水TN浓度小于15mg/L;正常排泥后,系统对TP的去除率达83%左右;平板膜破损会导致出水SS、COD会受到影响。膜对COD、TP、SS有直接截留作用,由于系统出水几乎没有固体损失,可以精确控制污泥龄,有利于世代周期较长的硝化菌和反硝化菌生长;系统中的污泥浓度可以提高至15000mg/L,此时,即使进水量提高0.5倍,出水水质仍保持良好。

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