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废水中KMnO4对生物处理效果的影响

Keywords: 牛仔服加工废水,KMnO4,生物处理,COD,NH4+-N,非竞争性抑制

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Abstract:

为减轻和消除含高浓度KMnO4的牛仔服加工废水对生物处理系统的毒害作用,采用模拟序批式活性污泥法,研究KMnO4对活性污泥微生物生长的影响及COD和NH4+-N的降解规律。结果表明,当处理进水COD浓度500mg/L,NH4+-N浓度23.5mg/L,污泥浓度为2000mg/L时,曝气时间为4h,KMnO4质量浓度增加对COD和NH4+-N的降解影响很大;同样条件下曝气时间改为8h,对NH4+-N的降解影响显著减小,但对COD的降解影响减少不多;并且,高浓度KMnO4对NH4+-N去除效果的抑制作用比对COD的大。因此,处理含高浓度KMnO4的废水需要延长一倍曝气时间,可以获得良好的COD和NH4+-N的降解效果。同时,KMnO4对活性污泥的抑制影响较好地吻合非竞争性抑制机理修正莫若特方程的规律。

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