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不同形态铁盐的除磷效果

Keywords: 混凝剂,铁盐形态,城镇污水,化学除磷

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Abstract:

研究不同铁盐存在形态的铁盐类混凝剂,即三氯化铁(离子态铁)、聚合氯化铁(聚合态铁)和氢氧化铁(凝胶态铁),在混凝除磷性能方面的差异。以城市污水厂的二级出水为实验水样,进行混凝除磷性能研究。结果表明,二级出水总磷为1.74mg/L,离子态铁投加量为40mg/L时,对总磷的去除率为90%,混凝处理后上清液总磷可达《城镇污水处理厂污染物排放标准》(GB18918-2002)中的一级A标准,聚合态铁对总磷的去除率为62%,凝胶态氢氧化铁的总磷去除率为59%,混凝处理后上清液总磷均不能满足GB18918-2002中的一级A标准。离子态氯化铁对污水厂二级出水的除磷效果优于聚合态,即铁离子的聚合形态会影响其除磷效果。

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