Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 27 Shanda Nanlu, Jinan 250100, Shandong, PR China.
Enzyme Microb Technol. 2011 Jul 10;49(2):237-45. doi: 10.1016/j.enzmictec.2011.04.014. Epub 2011 Apr 27.
Both long term and batch experiments were carried out to identify the sources of the N(2)O emission in anoxic/aerobic sequencing batch reactors (A/O SBRs) under different aeration rates. The obtained results showed that aeration rate has an important effect on the N(2)O emission of A/O SBR and most of the N(2)O was emitted during the aerobic phase. During the anoxic phase, nitrate ammonification was the major source of N(2)O emission while denitrification performed as a sink of N(2)O, in all three bioreactors. The N(2)O emission mechanisms during the aerobic phase differed with the aeration rate. At low and high aeration rates (Run 1 and Run 3), both coupled-denitrification and nitrifier denitrification were ascribed to be the source of N(2)O emission. At mild aeration rate (Run 2), nitrifier denitrification by Nitrosomonas-like ammonia oxidizing-bacterial (AOB) was responsible for N(2)O emission while coupled-denitrification turned out to be a sink of N(2)O because of the presence of inner anaerobic region in sludge flocs.
进行了长期和批量实验，以确定在不同曝气率下缺氧/好氧序批式反应器（A/O SBR）中 N(2)O 排放的来源。结果表明，曝气率对 A/O SBR 的 N(2)O 排放有重要影响，大部分 N(2)O 是在好氧阶段排放的。在缺氧阶段，硝酸盐氨化是 N(2)O 排放的主要来源，而反硝化则是 N(2)O 的汇，在所有三个生物反应器中均如此。好氧阶段的 N(2)O 排放机制随曝气率而异。在低曝气率和高曝气率（运行 1 和运行 3）下，耦合反硝化和硝化反硝化均被认为是 N(2)O 排放的来源。在温和的曝气率下（运行 2），亚硝化单胞菌样氨氧化菌（AOB）的硝化反硝化导致了 N(2)O 的排放，而由于污泥絮体中存在内部厌氧区，耦合反硝化成为了 N(2)O 的汇。
