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Biology of Microbial Communities - Interview
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Microbial community evolution in partial nitritation/anammox process: From sidestream to mainstream.

Yandong Yang1, Liang Zhang2, Jun Cheng2

  • 1National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China; School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, PR China.

Bioresource Technology
|January 1, 2018
PubMed
Summary
This summary is machine-generated.

Microbial communities in mainstream partial nitritation/anammox (PN/A) reactors evolved over 120 days. Anammox bacteria abundance decreased, shifting genera, while ammonium-oxidizing bacteria remained stable.

Keywords:
MainstreamMicrobial communityNitrogen removalPartial nitritation/anammox

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Area of Science:

  • Environmental Microbiology
  • Wastewater Treatment
  • Biotechnology

Background:

  • Partial nitritation/anammox (PN/A) is an efficient wastewater treatment process.
  • Understanding microbial dynamics in mainstream PN/A reactors is crucial for process optimization.
  • Sidestream PN/A systems have been studied, but mainstream systems present unique challenges.

Purpose of the Study:

  • To investigate microbial evolution in a mainstream PN/A reactor.
  • To compare microbial community structure between sidestream and mainstream PN/A processes.
  • To identify dominant microbial groups and their roles in mainstream PN/A.

Main Methods:

  • Operation of a mainstream PN/A reactor for 120 days with pre-treated sewage.
  • Monitoring microbial community composition using quantitative PCR and high-throughput sequencing.
  • Analysis of sludge samples to determine the localization of key microbial groups.

Main Results:

  • Anammox bacteria preferentially colonized granular sludge, while ammonium-oxidizing bacteria (AOB) favored flocculent sludge.
  • Anammox bacteria abundance decreased significantly over 120 days.
  • A shift in dominant anammox genera from Ca. Brocadia to Ca. Kuenenia was observed, while Nitrosomonas remained the dominant AOB genus.
  • Heterotrophs, particularly Chloroflexi, constituted the majority of the microbial community and were enriched under mainstream conditions.

Conclusions:

  • The study elucidates the microbial succession and community structure in a mainstream PN/A reactor.
  • Findings highlight the distinct spatial distribution of key functional bacteria within the sludge.
  • The enrichment of heterotrophs like Chloroflexi suggests their potential role in nutrient cycling within the mainstream PN/A process.