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Variable aeration in sequencing batch reactor with aerobic granular sludge.

Yong-Qiang Liu1, Joo-Hwa Tay

  • 1Environmental Engineering Research Centre, School of Civil and Environmental Engineering, Nanyang Technological University, Singapore, Singapore. cyqliu@ntu.edu.sg

Journal of Biotechnology
|March 10, 2006
PubMed
Summary

Reduced aeration in sequencing batch reactors (SBRs) using aerobic granular sludge during famine periods maintains stability and biomass concentration. This strategy significantly cuts energy use, enhancing the competitiveness of SBR technology.

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Area of Science:

  • Environmental Engineering
  • Wastewater Treatment
  • Biotechnology

Background:

  • Sequencing batch reactors (SBRs) are widely used for wastewater treatment.
  • Aerobic granular sludge technology offers advantages over conventional activated sludge processes.
  • Optimizing aeration in SBRs is crucial for energy efficiency and process stability.

Purpose of the Study:

  • To investigate the impact of reduced aeration during famine periods on aerobic granular sludge performance in SBRs.
  • To assess the stability and characteristics of aerobic granular sludge under varied aeration conditions.
  • To evaluate the potential for energy savings in SBR operations.

Main Methods:

  • Cultivated aerobic granular sludge in two SBRs (R1 and R2) using acetate as the sole carbon source.

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  • Reduced aeration rate in R1 during specific periods from day 27 and day 63.
  • Maintained a constant high aeration rate in R2 as a control throughout the experiment.

    • Main Results:

    • Aerobic granular sludge remained stable in R1 despite reduced aeration during famine periods.
    • Biomass concentration and SVI (Sludge Volume Index) showed similar trends in both R1 and R2.
    • Granule size in R1 (750 µm) was larger than in R2 (550 µm) at steady state.

    Conclusions:

    • Aerobic granular sludge technology can be stable under reduced aeration rates in famine periods for over three months.
    • Reduced aeration strategies significantly decrease energy consumption, making SBRs more competitive.
    • Findings deepen the understanding of aerobic granulation mechanisms, highlighting the role of feast/famine physiology.