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首页> 外文会议>2011 International Conference on Computer Distributed Control and Intelligent Environmental Monitoring >The Effect of DO on N2O Production in Simultaneous Nitrification and Denitrification Process
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The Effect of DO on N2O Production in Simultaneous Nitrification and Denitrification Process

机译：同时硝化反硝化过程中DO对N2O产生的影响

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摘要

N2O formation was studied using Sequencing Biofilm Batch Reactor (SBBR) by applying different DO(Dissolved Oxygen) gradient in the system. Simultaneous nitrification and denitrification (SND) process was achieved at different DO concentrations. Total N2O productions were0.495, 0.423, 0.843 and 2.01 mg-N/L respectively in accordance with DO concentrations, which were controlled at 1.0, 2.0, 2.5 and 3.0mg/L. Nitrite accumulation increased with the increasing of DO concentration. The activity of N2Oreductase was inhibited by higher nitrite, which resulted inN2O emission. Besides, nitrifier denitrification process during which nitrite as electron acceptor and ammonium as electron donor was responsible for part of N2O emission. When DO was controlled at 2.0 mg/L, more than 97% of ammonium was removed by SND process and N2O emission was lower than any other processes. It showed that both lower and higher DO concentrations could suppress SND process and a balanced SND may reduce N2O production.
机译：使用测序生物膜间歇反应器（SBBR）研究了N2O的形成，方法是在系统中应用不同的DO（溶解氧）梯度。在不同的DO浓度下实现了同时硝化和反硝化（SND）过程。根据溶解氧的浓度，总的N2O产量分别为0.495、0.423、0.843和2.01 mg-N / L，分别控制在1.0、2.0、2.5和3.0mg / L。随着DO浓度的增加，亚硝酸盐积累增加。 N2O还原酶的活性被较高的亚硝酸盐抑制，导致N2O的排放。此外，在硝化器反硝化过程中，亚硝酸盐作为电子受体，铵盐作为电子给体，是N2O排放的一部分。当溶解氧控制在2.0 mg / L时，通过SND工艺去除了超过97％的铵，并且N2O的排放量低于任何其他工艺。结果表明，较低和较高的溶解氧浓度都可以抑制SND过程，而平衡的SND则可以减少N2O的产生。

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