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[Microbial Community Dynamics During Two Sludge Granulation Processes].

Jing-Feng Gao1, Li-Fang Zhang1, Shu-Jun Zhang2

  • 1National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China.

Huan Jing Ke Xue= Huanjing Kexue
|July 3, 2018
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Summary
This summary is machine-generated.

This study investigated microbial community dynamics during aerobic granular sludge (AGS) formation and maturation. Key findings show extracellular substances and specific bacteria like *Ca. Competibacter* contribute to AGS granulation and stability.

Keywords:
Candidatus Competibacteraerobic granular sludgehigh-throughput sequencingmicrobial communitynitrifying microorganisms

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Area of Science:

  • Environmental microbiology
  • Wastewater treatment
  • Biotechnology

Background:

  • Aerobic granular sludge (AGS) is crucial for efficient wastewater treatment in sequencing batch reactors (SBRs).
  • Understanding microbial community shifts during AGS formation and recovery is vital for process optimization.

Purpose of the Study:

  • To investigate microbial community dynamics during two distinct AGS formation processes.
  • To identify dominant bacteria and nitrifying microorganisms involved in AGS granulation and maturation.
  • To elucidate the role of extracellular polymeric substances (EPS) in sludge granulation.

Main Methods:

  • Cultivation of AGS in an SBR, including a recovery phase after sludge breakdown.
  • High-throughput sequencing for analyzing bacterial community composition and dynamics.
  • Quantitative polymerase chain reaction (qPCR) to quantify ammonia-oxidizing microorganisms (AOA and AOB).
  • Analysis of extracellular protein and polysaccharide content.

Main Results:

  • Extracellular protein and polysaccharide content increased during AGS granulation.
  • Ammonia oxidizing archaea (AOA) abundance increased during AGS formation and maturation.
  • Microbial diversity decreased, while Proteobacteria and *Candidatus Competibacter* (14.20%) became dominant.
  • Ammonia oxidizing bacteria (AOB) abundance decreased initially but remained higher than AOA.

Conclusions:

  • Extracellular polymeric substances (EPS) likely play a significant role in promoting sludge granulation.
  • Both ammonia oxidizing archaea (AOA) and bacteria (AOB) are involved in ammonia oxidation within AGS.
  • *Candidatus Competibacter* enrichment suggests its potential contribution to AGS formation and stability.