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Stability in a denitrifying fluidized bed reactor.

M Gentile1, T Yan, S M Tiquia

  • 1Department of Civil and Environmental Engineering, Stanford University, Stanford, CA, USA.

Microbial Ecology
|July 29, 2006
PubMed
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This study on denitrifying reactors shows that microbial community function is more resilient than structure during disturbances. Reactor performance recovered quickly after perturbations, indicating a flexible microbial community.

Area of Science:

  • Environmental microbiology
  • Biotechnology

Background:

  • Denitrifying fluidized bed reactors are crucial for wastewater treatment.
  • Understanding microbial community dynamics under stress is vital for optimizing reactor performance.

Purpose of the Study:

  • To evaluate microbial community structure and function changes in a pilot-scale denitrifying fluidized bed reactor.
  • To assess the impact of operational perturbations on reactor stability and recovery.

Main Methods:

  • Utilized cloning and sequencing, and terminal restriction fragment length polymorphism (T-RFLP) of the SSU rRNA gene.
  • Applied periods of constant operation, shutdown, mechanical shearing, and increased nitrate loading.

Main Results:

  • Nitrate removal exceeded 99% under stable conditions.

Related Experiment Videos

  • Mechanical disturbances and increased nitrate loading altered microbial community structure.
  • Reactor function demonstrated higher resilience than community structure, with rapid recovery observed.

    • Conclusions:

    • Microbial community function in denitrifying reactors is more resilient to perturbations than its structure.
    • A flexible community structure, potentially involving minor microbial members, aids system recovery after disturbances.