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Specific layers in aerobically grown microbial granules.

J-H Tay1, V Ivanov, S Pan

  • 1School of Civil and Environmental Engineering, College of Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798.

Letters in Applied Microbiology
|April 10, 2002
PubMed
Summary
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Optimal aerobic granules for wastewater treatment are less than 1600 micrometers in diameter. This size ensures distinct aerobic and anaerobic layers, crucial for efficient microbial activity and treatment processes.

Area of Science:

  • Microbiology
  • Environmental Science
  • Biotechnology

Background:

  • Wastewater treatment relies on microbial aggregates like aerobic granules.
  • Understanding the internal structure of these granules is key to optimizing their performance.

Purpose of the Study:

  • To determine the optimal size of aerobically grown granules for wastewater treatment.
  • To investigate the layered structure of microbial communities within these granules.

Main Methods:

  • Utilized oligonucleotide probes, specific fluorochromes, and fluorescent microspheres to identify biological layers.
  • Measured penetration depths of channels and identified bacterial layers within the granule matrix.

Main Results:

  • Detected diverse biological layers, including obligate anaerobic bacteria at 800 micrometers.

Related Experiment Videos

  • Observed dead cells within the granule interior.
  • Identified channels penetrating up to 900 micrometers into the granule matrix.

    • Conclusions:

    • Aerobically grown granules exhibit distinct layers of aerobic and anaerobic microorganisms.
    • Optimal aerobic granule diameter is less than 1600 micrometers, supporting a functional anaerobic layer.
    • This methodology can be applied to optimize other microbial aggregates like flocs and biofilms.