4.8 Article

Autotrophic nitrogen removal in combined nitritation and Anammox systems through intermittent aeration and possible microbial interactions by quorum sensing analysis

期刊

BIORESOURCE TECHNOLOGY
卷 272, 期 -, 页码 146-155

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.10.017

关键词

Nitrification; Anammox; Quorum sensing; Microbial interaction; Metagenomics

资金

  1. Major Science and Technology Program for Water Pollution Control and Treatment of China [2018ZX07604-001]
  2. Development and Reform Commission of Shenzhen Municipality (urban water recycling and environment safety program)

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Nitrogen removal and microbial interactions in two combined nitritation and Anammox systems with or without the addition of organics were examined. Two systems were successfully started up by adopting intermittent aeration. Organics addition deteriorated nitrogen removal, and total inorganic nitrogen and ammonium removal percentages decreased by 16.4% and 26.3%, respectively. Organics addition promoted the growth of Chloroflexi and Proteobacteria while suppressed the growth of Candidatus Kuenenia. Organics addition decreased activities of fatty acid biosynthesis and metabolism, amino acid metabolism and biofilm formation, while increased activities of steroid metabolism and glycosaminoglycan biosynthesis. Heterotrophs and Candidatus Kuenenia might interact with other organisms by using diverse quorum sensing systems. Chloroflexi and Proteobacteria interacted with Candidatus Kuenenia in nitrogen metabolism and biofilm formation. Proteobacteria played a key role in building a nitrite loop with Candidatus Kuenenia and nitrifiers. These results clarified microbial interactions in the autotrophic nitrogen removal process and advance its application.

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