反硝化作用（denitrification）也称脱氮作用。反硝化细菌在缺氧条件下，还原硝酸盐，释放出分子态氮（N2）或一氧化二氮（N2O）的过程。
反硝化反应(Denitrification)是细菌在厌氧或者兼性厌氧条件下，分解了有机物并产生能量过程中，将NO2-和NO3-替代O2作为电子受体，最终生成N2和N2O的生化过程。
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The degree of denitrification was responded accuratly by the change of ORP and pH. And the end point of denitrification reaction may accurately judged by the change curve.
ORP和pH的变化可以较好地反映反硝化反应进行的程度，通过测得ORP和pH变化曲线的拐点可准确判断反硝化反应的终点。
参考来源 - SBR中反硝化和生物除磷颗粒污泥特性研究·2,447,543篇论文数据，部分数据来源于NoteExpress
氮通过发生同时硝化反硝化反应而去除。
N was removed through the simultaneous nitrification and denitrification process.
湿地上部适合硝化反应的进行，下部则适宜反硝化反应的进行；
The upper part is suitable for the conduct of nitration, while the lower part is suitable for the conduct of denitrification;
通过三相生物流化床处理炼油废水实验，提出了同时硝化反硝化反应。
The simultaneous nitrification and denitrification reaction is presented based on the experiments of treating refinery waste water on 3-phase fluidized-bed bioreactor.
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