NO对厌氧氨氧化反应的影响

Influence of NO on anaerobic ammonium oxidation reaction

通过在厌氧氨氧化塔式生物滤池内通入不同浓度的NO气体,探究NO对厌氧氨氧化反应的影响。当NO进气浓度升高至4 018 mg·m-3,NO-2-N进水浓度降低至20 mg·L^(-1)时,NO-N在电子受体中的比例升高至78.8%,NO去除速率最高达165.8 mg·d-1,证明厌氧氨氧化菌可以利用NO-N为电子受体进行厌氧氨氧化反应脱除NO。在这一过程中,TN去除负荷与不通入NO时相比下降了74.3%,NO-3-N生成∶NH+4-N消耗比从0.26下降至0.13。当NO进气浓度升高至8 036 mg·m-3时,NO对厌氧氨氧化菌产生了抑制,TN去除负荷和NO消耗速率分别下降了47.1%和69.6%,同时NO-2-N在电子受体中的比例升高至56.9%。实验证明,提高NO-2-N进水浓度能降低高浓度NO对厌氧氨氧化菌的抑制性。

The effect of nitric oxide（ NO） on anaerobic ammonium oxidation（ anammox） was investigated by introducing different concentrations of NO to an anammox tower biological filter. When NO concentration increased to 4,018 mg·m- 3,the NO-2-N concentration decreased to 20 mg·L^（-1）. The proportion of NO in the electron acceptor increased to 78. 8%,and the removal rate of NO reached a peak value of 165. 8 mg·d- 1. The results showed that NO-N could be used as the electron acceptor in the anammox reaction. During the study period,the total nitrogen（ TN） removal load decreased by 74. 3%. The reaction ratio between NO-3-N production and NH＋4-N consumption decreased from 0. 26 to 0. 13. The anammox bacteria were inhibited when the concentration of NO increased to 8,036 mg·m- 3. The TN removal load and removal rate of NO decreased by 47. 1%and 69. 6%,respectively. The proportion of NO-2-N in the electron acceptor increased to 56. 9%. This revealed that the increase in NO-2-N concentration reduced the inhibition caused by a high NO concentration.