SNAD生物膜厌氧氨氧化活性的氨氮抑制动力学研究

The kinetic coefficients of ammonium inhibition on the Anammox activity of SNAD biofilm

通过批试实验研究了氨氮浓度对SNAD生物膜厌氧氨氧化性能的影响.SNAD生物膜反应器以生活污水为进水.进水NH_4^+-N和COD浓度平均值分别为70mg/L和180mg/L,出水NH_4^+-N,NO_2^--N,NO_3^--N和COD浓度平均值分别为2mg/L,2mg/L,7mg/L和50mg/L.SNAD生物膜具有良好的厌氧氨氧化活性.初始NH_4^+-N和NO_2^--N浓度都为70mg/L时,厌氧氨氧化批试NH_4^+-N、NO_2^--N和TIN去除速率分别为0.121kg N/(kg VSS·d),0.180kg N/(kg VSS·d)和0.267kg N/(kg VSS·d).采用Haldane模型可以很好的拟合氨氮浓度对厌氧氨氧化活性的影响.在高FA和低FA工况下氨氮浓度对厌氧氨氧化活性的抑制动力学常数相差不大.M1(FA浓度为0.7~20.4mg/L)和M2(FA浓度为6.3~190.5mg/L)的最大NO_2^--N理论去除速率r_(max)分别为0.209kg N/(kg VSS·d)和0.221kg N/(kg VSS·d),氨氮半饱和常数Ks分别为9.5mg/L和6.1mg/L,氨氮自身抑制常数KI分别为422mg/L和597mg/L.氨氮(而不是游离氨)对SNAD生物膜的厌氧氨氧化活性起主要抑制作用.

The effect of ammonium concentrations on the anaerobic ammonium oxidation（Anammox） activity of simultaneous partial nitrification, anaerobic ammonium oxidization and denitrification（SNAD） biofilm was investigated in batch tests. The SNAD biofilm reactor performed stable nitrogen removal performance with the influent of domestic wastewater. The average influent NH_4-＋-N and COD concentrations were 70mg/L and 180mg/L, respectively. As a result, the average effluent NH_4-＋-N, NO_2-N and NO_3-N concentrations were 2mg/L, 2mg/L, 7mg/L and 50mg/L, respectively. The SNAD biofilm performed good Anammox activity. The NH_4-＋-N, NO_2-N and total inorganic nitrogen（TIN） removal rates were 0.121 kg N/（kg VSS·d）, 0.180 kg N/（kg VSS·d） and 0.267 kg N/（kg VSS·d） with the initial NH_4-＋-N and NO_2-N concentrations of both 70mg/L. Moreover, Haldane model was applied to investigate the ammonium inhibition on the Anammox process. There is no obvious difference in kinetic coefficients of ammonium inhibition under high or low FA conditions. As for M1（FA ranges of 0.7mg/L and 20.4mg/L）, the r_（max）, Ks and KI of ammonium were 0.209 kg NO_2-N/（kg VSS·d）, 9.5mg/L and 422mg/L. As for M2（FA ranges of 6.3mg/L and 190.5mg/L）, the r_（max）, Ks and KI of ammonium were 0.221 kg NO_2-N/（kg VSS·d）, 6.1mg/L and 597mg/L. Ammonium rather than FA is the main inhibitor for Anammox process.