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Related Experiment Videos

Hydraulic selection pressure-induced nitrifying granulation in sequencing batch reactors.

J-H Tay1, S-F Yang, Y Liu

  • 1Environmental Engineering Research Centre, School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798.

Applied Microbiology and Biotechnology
|July 12, 2002
PubMed
Summary
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Proper hydraulic selection pressure, controlled by sequencing batch reactor (SBR) cycle time, is crucial for developing effective nitrifying granules. Optimal SBR cycle times of 6-12 hours promote granulation for wastewater nitrification.

Area of Science:

  • Environmental Microbiology
  • Biotechnology
  • Wastewater Treatment

Background:

  • Nitrifying granules are essential for efficient wastewater nitrification.
  • Understanding the factors influencing nitrifying granulation is key to optimizing treatment processes.

Purpose of the Study:

  • To investigate the impact of hydraulic selection pressure on nitrifying granule development.
  • To determine the optimal sequencing batch reactor (SBR) cycle times for granulation.

Main Methods:

  • Four column-type SBRs were operated under varying cycle times (3h, 6h, 12h, 24h).
  • Hydraulic selection pressure was manipulated by adjusting SBR cycle times.
  • Microbial community changes, including activity, polysaccharide production, and hydrophobicity, were analyzed.

Related Experiment Videos

Main Results:

  • No granulation occurred at 24h cycle time (weak pressure).
  • Nitrifying sludge washout occurred at 3h cycle time (strong pressure).
  • Excellent nitrifying granules (0.25 mm diameter, 1.014 specific gravity) formed at 6h and 12h cycle times.
  • Shorter cycle times stimulated microbial activity, polysaccharide production, and cell hydrophobicity.

Conclusions:

  • Nitrifying granulation is achievable at specific hydraulic selection pressures, regulated by SBR cycle time.
  • Optimized SBR cycle times enhance microbial properties favorable for granulation.
  • This study presents a novel approach to developing nitrifying granules for advanced wastewater nitrification.