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中文摘要：
异养硝化-好氧反硝化（Heterotrophic Nitrification-Aerobic Denitrification，HN-AD）菌的发现，是对传统硝化反硝化理论的丰富与突破。HN-AD菌不但可以将氨氮转化为氮气等气态产物，而且几乎不会产生NO 2 - -N/NO 3 - -N的积累，还可以去除COD，这一优势使其成为生物脱氮领域的研究热点。在介绍HN-AD基本理论及典型HN-AD菌代谢机理的基础上，重点综述了近年来分离出的典型HN-AD菌的脱氮特性，分析了HN-AD菌的最佳脱氮参数，同时介绍了HN-AD菌在废水处理方面的应用现状，最后对其前景进行了展望。
英文摘要：
The paper is dedicated to making a research progress review on the heterotrophic nitrification-aerobic denitrification in biological denitrification. It is for this purpose that we have made an investigation of the bacteria capable of combined heterotrophic nitrification and aerobic denitrification as potential microorganisms in the biological nitrogen removal system. As is known, biological denitrification is the main process in removing ammonia-N compounds from the sewage. Actually, the discovery of heterotrophic nitrification-aerobic denitrification （HN-AD） is a process of the enrichment and breakthrough of the conventional nitrification-denitrification process, which tends to isolate certain bacteria from the soils, pools and sewage treatment systems. As compared with the conventional denitrification, HN-AD has the following advantages： （1） Simultaneous removal of COD and nitrogen is carried out by utilizing the organic substrates and tolerance to oxygen to achieve nitrification and denitrification in a single-stage reactor, which can help to reduce the space and construction cost; （2） ammonia nitrogen can mainly be converted into gaseous products with no accumulation of NO 2 - -N/NO 3 - -N; （3） the high growth rate of heterotrophs can be made easily retained in the treatment system; （4） the diversity of possible substrates and products of heterotrophic nitrification-aerobic denitrifiers helps to facilitate the mixed culture with a variety of bacterial strains and expand the scope of the possible applications. Therefore, closer attention should be paid to HN-AD bacteria for the sewage treatment. Thus, from what we have said above, the purpose of this paper is just to provide a critical review on the HN-AD and delineate its basic definition and mechanism of the typical HN-AD bacteria, with the focus aiming to review the denitrification characteristic features of some isolated typical HN-AD bacteria in recent years and analyze the optimum parameters of the denitrification. And, finally, we
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