School of Environmental Science and Engineering, Shandong University, 27 Shanda Nanlu, Jinan, 250100, PR China.
J Biosci Bioeng. 2010 May;109(5):487-91. doi: 10.1016/j.jbiosc.2009.11.001. Epub 2009 Dec 2.
Nitrous oxide (N(2)O) is a significant greenhouse gas, and biological nitrogen removal systems have been shown to be a significant N(2)O source. To evaluate the control parameters for N(2)O emission in the wastewater treatment process, N(2)O emissions were compared in the activated sludge from anoxic-aerobic sequencing batch reactors (A/O SBRs) acclimated under different aeration rates, and fed with synthetic wastewater. Results showed that a higher aeration rate led to a smaller N(2)O emission, while reactors acclimated under mild aeration performed the best in terms of nitrogen removal efficiency. Most of the N(2)O was produced during the aerobic phase, regardless of the aeration rate. Trace studies showed that incomplete denitrification appeared to be the major process responsible for high N(2)O emission at a low aeration rate (Run 1), while incomplete nitrification was the reason for N(2)O emission at a higher aeration rate (Run 2 and Run 3). For enhancing the efficiency of nitrogen removal while lowering energy consumption and reducing N(2)O emission, the optimal aeration rate would be 2.7 L(air)/(L(reactor) . h), in terms of the synthetic wastewater used.
一氧化二氮（N2O）是一种重要的温室气体，生物脱氮系统已被证明是 N2O 的重要来源。为了评估废水处理过程中 N2O 排放的控制参数，比较了在不同曝气速率下驯化的缺氧-好氧序批式反应器（A/O SBR）中的活性污泥的 N2O 排放，并以合成废水为食。结果表明，较高的曝气速率导致 N2O 排放量较小，而在温和曝气条件下驯化的反应器在脱氮效率方面表现最佳。无论曝气速率如何，大多数 N2O 都是在好氧阶段产生的。痕量研究表明，在低曝气速率下（运行 1），不完全反硝化似乎是导致 N2O 排放高的主要过程，而在较高曝气速率下（运行 2 和运行 3），不完全硝化是 N2O 排放的原因。为了在降低能耗和减少 N2O 排放的同时提高脱氮效率，对于所使用的合成废水而言，最佳曝气速率为 2.7 L(air)/(L(reactor). h)。
