碱度指示MBR中同步硝化反硝化的研究
Study on alkalinity as indicator for simultaneous nitrification and denitrification in MBR
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摘要: 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（330～440 mg/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（60～280 mg/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-3-N浓度升高而升高（ΔAlkexper=3.68［N］+161.11,R2=0.88，出水NH+4<5.5 mg/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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关键词:
- 膜生物反应器(MBR) /
- 同步硝化反硝化(SND) /
- 碱度 /
- pH
Abstract: The study aimed at investigating alkalinity as a reliable indicator for the effect of SND under a series of operational conditions by MBR. Under sufficient denitrification, effluent alkalinity exhibited a linear correlation with TN concentration (Alk=3.22［N］+333.08,R2=0.85), with effluent alkalinity of 330～440 mg/L.While under sufficient nitrification,effluent alkalinity exhibited a linear reverse correlation with TN concentration (Alk=-4.93［N］+317.86,R2=0.89),with effluent alkalinity of 60～280 mg/L.Furthermore, experimental alkalinity difference between influent and effluent (ΔAlkexper) was studied as another indicator. ΔAlkexper decreased with the increasing effluent NH+4 concentration(ΔAlkexper =-3.85［N］+149.11,R2=0.88, effluent NO-3-N-3-N concentration (ΔAlkexper=3.68［N］+161.11,R2=0.88,effluent NH+4-N<5.5 mg/L). pH was not well related with nitrogen removal. -
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