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The paper is dedicated to making a research progress re view on the heterotrophic nitrification-aerobic denitrification in bio logical denitrification. It is for this purpose that we have made an in vestigation of the bacteria capable of combined heterotrophic nitrifi cation and aerobic denitrification as potential microorganisms in the biological nitrogen removal system. As is known,biological denitrifi cation is the main process in removing ammonia-N compounds from the sewage. Actually,the discovery of heterotrophic nitrification-aer obic 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 sew age treatment systems. As compared with the conventional denitrifi cation,HN-AD has the following advantages:( 1) Simultaneous re moval of COD and nitrogen is carried out by utilizing the organic substrates and tolerance to oxygen to achieve nitrification and deni trification 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 sub strates and products of heterotrophic nitrification-aerobic denitrifier helps to facilitate the mixed culture with a variety of bacterial strain and expand the scope of the possible applications. Therefore,close attention should be paid to HN-AD bacteria for the sewage treat ment. Thus,from what we have said above,the purpose of this pa per 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 fea tures of some isolated typical HN-AD bacteria in recent years and analyze the optimum parameters of the denitrification. And,finally,we would like to make an introduction to the present situation and potential applications of sewage treatment by HN-AD bacteria,and also outlined the challenges and future research tendency will be pu on the HN-AD.
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Basic Information:
DOI：10.13637/j.issn.1009-6094.2014.02.028
China Classification Code:X703
Citation Information:
[1]QIAO Sen,LIU Xue-jie,ZHOU Ji-ti ,et al.Research progress of heterotrophic nitrification-aerobic denitrification in biological denitrification[J].Journal of Safety and Environment,2014,14(02):128-135.DOI:10.13637/j.issn.1009-6094.2014.02.028.
Fund Information:
国家自然科学基金项目(51008045);; 大连市科技计划项目(2012E11SF067);; 大连理工大学基本科研业务费专项项目(DUT12LK20)
2014-04-25
2014-04-25