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碱度指示MBR中同步硝化反硝化的研究
Keywords: 膜生物反应器(MBR),同步硝化反硝化(SND),碱度,pH
Abstract:
在连续的操作环境下,通过改变在膜生物反应器(MBR)中的C/N和曝气量,研究碱度对同步硝化反硝化脱氮效果的指示作用。结果发现,在反硝化完全的情况下,出水碱度(330~440mg/L)在硝化过程中较高并与出水TN表现出好的线性关系(Alk=3.22[N]+333.08,R2=0.85);在硝化完全的情况下,出水碱度(60~280mg/L)在反硝化过程中较低并与出水TN也有很好的线性关系(Alk=-4.93[N]+317.86,R2=0.89)。实际消耗的碱度可以作为另一个指示因子(ΔAlkexper),实际消耗的碱度随出水的NH+4浓度升高而降低(ΔAlkexper=-3.85[N]+149.11,R2=0.88,出水NO-3-N<4.5mg/L);实际消耗的碱度随出水的NO-3-N浓度升高而升高(ΔAlkexper=3.68[N]+161.11,R2=0.88,出水NH+4<5.5mg/L)。虽然pH的变化有一定的规律,但是对SND脱氮效果指示不灵敏。
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