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Related Experiment Videos

Nitrogen removal in a SBR using the OGAR process control system.

Z Tomlins1, M Thomas, J Keller

  • 1ASTRAN, Ondeo Services, Noosa Heads Qld, Australia. zane.tomlins@aws.aust.com

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|October 4, 2002
PubMed
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The OGAR system, using redox measurements for activated sludge process control, effectively reduced total nitrogen to below 5.0 mg/L in sequencing batch reactors. This demonstrates its capability to meet stringent environmental regulations.

Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Process Control Systems

Background:

  • Conventional activated sludge process control relies on dissolved oxygen (DO) measurements.
  • Redox potential offers an alternative control parameter applicable during both aerobic and anoxic conditions.
  • Existing control systems may not consistently meet strict effluent nitrogen limits.

Purpose of the Study:

  • To evaluate the first application of the OGAR (On-line Redox) system in a sequencing batch reactor (SBR).
  • To demonstrate OGAR's capability in achieving total nitrogen concentrations below 10 mg/L, as stipulated by the Queensland Environmental Protection Agency (EPA).
  • To compare the performance of OGAR with dissolved oxygen setpoints.

Main Methods:

  • Implementation of the OGAR industrial process control system in an SBR.

Related Experiment Videos

  • Utilisation of on-line redox measurements to control the aeration sequence.
  • Monitoring of effluent parameters including total nitrogen, ammonia, and nitrate.
  • Comparison of SBR performance with different dissolved oxygen (DO) setpoints.

    • Main Results:

    • Consistent effluent total nitrogen levels below 5.0 mg/L were achieved.
    • Ammonia concentration was significantly reduced from 31.6 mg/L to 0.32 mg/L.
    • Effluent nitrate levels averaged 2.8 mg/L.
    • A DO setpoint of 1.5 mg/L resulted in 10% higher effluent total nitrogen compared to a 4.0 mg/L DO setpoint.
    • Optimal redox end-points were identified as 400 mV for nitrification and 150 mV for denitrification.

    Conclusions:

    • The OGAR system effectively controls activated sludge processes using redox measurements.
    • OGAR enables consistent achievement of low effluent total nitrogen concentrations, meeting strict environmental standards.
    • Redox-based control in SBRs offers a viable alternative to traditional DO control for enhanced nitrogen removal.