A review of research progress of heterotrophic nitrification and aerobic denitrification microorganisms (HNADMs)

• Published in: The Science of the total environment Vol. 801; p. 149319
• Main Authors: Song, Tao, Zhang, Xiaolei, Li, Ji, Wu, Xinyu, Feng, Haixia, Dong, Wenyi
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 20.12.2021
• Subjects: ammonium nitrogen; carbon; denitrification; environment; Extracellular polymeric substance; nitrification; nitrogen; Nitrogen assimilation; nitrogen metabolism; oxygen; P removal; phosphorus; pollution control; polymers; Quorum sensing; secretion; Simultaneous nitrification and denitrification; wastewater; P removal; Quorum sensing; Extracellular polymeric substance; Simultaneous nitrification and denitrification; Nitrogen assimilation
• ISSN: 0048-9697; 1879-1026; 1879-1026
• DOI: 10.1016/j.scitotenv.2021.149319

Traditional nitrogen removal relies on the autotrophic nitrification and anaerobic denitrification process. In the system, autotrophic microorganisms achieve nitrification under aerobic condition and heterotrophic microorganisms complete the denitrification in anaerobic condition. As the two types of microorganisms have different tolerance on oxygen concentration, nitrification and denitrification are normally set in two compartments for high nitrogen removal. Therefore, large land occupying is required. In fact, there is a special type of microorganism called heterotrophic nitrification & aerobic denitrification microorganisms (HNADMs) which can oxidize ammonium nitrogen, and perform denitrification in the presence of oxygen. HNADMs have been reported in many environments. It was found that HNADMs could simultaneously achieve nitrification and denitrification. In addition, some HNADMs not only have the ability to remove nitrogen, but also have the ability to remove phosphorus. It suggests that HNADMs have great potential for pollution removal from wastewater. So far, individual work on single strain was carried out. Comprehensive summary of the HNADMs would provide a better picture for understanding and directing its application. In this paper, the studies related on HNADMs were reviewed. The nitrogen metabolism pathway of HNADMs was summarized. The impact of pH, DO, carbon source, and C/N on HNADMs growth and metabolism were discussed. In addition, the extracellular polymeric substance (EPS) production, quorum sensing (QS) secretion and P removal by HNADMs were displayed. [Display omitted] •Heterotrophic nitrification and aerobic denitrification microorganism is reviewed.•Cultivation condition impact on the microorganism is discussed.•Nitrogen and phosphorus metabolism mechanism of the microorganism is proposed.•The EPS and QS of the microorganism are summarized.