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Related Experiment Videos

A software nitrate sensor based on ammonium and redox signals.

D Cecil1

  • 1Odense Water Ltd., Vandvaerksvej 7, 5000 Odense C., Denmark. dc@ov.dk

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|February 3, 2004
PubMed
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A new model estimates real-time nitrate concentration in activated sludge using online measurements. This advanced wastewater treatment model accurately predicts nitrate levels, improving operational efficiency.

Area of Science:

  • Environmental Engineering
  • Water Quality Monitoring
  • Wastewater Treatment

Background:

  • Activated sludge processes are crucial for wastewater treatment.
  • Accurate real-time monitoring of nitrate concentration is essential for process optimization.
  • Existing methods for nitrate measurement may have limitations in speed or accuracy.

Purpose of the Study:

  • To develop and validate a real-time model for computing nitrate concentration in activated sludge.
  • To integrate the model into existing wastewater treatment plants (WWTPs) for operational use.
  • To compare model predictions with in-situ sensor measurements.

Main Methods:

  • Utilized a model, a subset of the Activated Sludge Model 1 (ASM1).
  • Integrated online measurements of oxygen, ammonium, and redox in aeration tanks.

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  • Continuously adjusted influent ammonium, nitrification rate, denitrification rate, and net hydrolysis.
  • Computed and updated nitrate concentration every 10 seconds.

    • Main Results:

    • The model successfully computed real-time nitrate concentrations.
    • Model results were compared against a Dr Lange in-situ nitrate sensor.
    • Achieved a systematic difference of less than 0.2 mgN L(-1) between model and sensor.
    • 90% of differences were within the range of -1.1 to 1.1 mgN L(-1).

    Conclusions:

    • The developed model provides a reliable method for real-time nitrate estimation in activated sludge.
    • The model's accuracy is comparable to in-situ sensors, offering a valuable tool for WWTP management.
    • Real-time nitrate monitoring enhances the understanding and control of wastewater treatment processes.