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Improving anaerobic sequencing batch reactor performance by modifying operational parameters.

Ioannis Shizas1, David M Bagley

  • 1Department of Civil Engineering, University of Toronto, Ont, Canada.

Water Research
|January 5, 2002
PubMed
Summary
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Optimizing anaerobic sequencing batch reactor (ASBR) operation by adjusting influent concentration and cycle times improved performance under high organic loading rates. This suggests operational parameter changes can enhance ASBR efficiency.

Area of Science:

  • Environmental Science
  • Biotechnology
  • Chemical Engineering

Background:

  • Anaerobic sequencing batch reactors (ASBRs) are crucial for wastewater treatment.
  • High organic loading rates can challenge reactor stability and performance.
  • Understanding operational parameter impacts is vital for efficient ASBR function.

Purpose of the Study:

  • To investigate the impact of operational parameters on ASBR performance under stressed conditions.
  • To identify optimal configurations for enhanced ASBR efficiency with glucose as influent.
  • To evaluate the role of influent concentration and cycle times in reactor stability.

Main Methods:

  • A lab-scale ASBR was operated with glucose at elevated organic loading rates (2.1 to 3.2 kg COD m⁻³ d⁻¹).

Related Experiment Videos

  • Five different combinations of influent concentration, total cycle time, and fill time to cycle time ratio were tested.
  • Effluent analysis focused on acetate and propionate concentrations without external pH control.

    • Main Results:

    • All tested configurations maintained acetate and propionate as primary effluent constituents.
    • Increased fill time to cycle time ratios led to improved ASBR performance.
    • Lower initial substrate concentrations also correlated with enhanced reactor performance.

    Conclusions:

    • ASBR operational parameters, specifically fill time to cycle time ratio and influent concentration, significantly influence performance.
    • Adjusting these parameters offers a viable strategy for improving ASBR efficiency under high organic loads.
    • Further optimization of ASBR operation can be achieved through strategic manipulation of cycle times and substrate levels.