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Related Experiment Videos

Dissolved oxygen in gravity sewers--measurement and simulation.

G Gudjonsson1, J Vollertsen, T Hvitved-Jacobsen

  • 1Environmental Engineering Laboratory, Aalborg University, Denmark.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|March 21, 2002
PubMed
Summary
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Dissolved oxygen (DO) levels in sewers fluctuate daily due to wastewater composition and temperature. Rising temperatures can lead to anaerobic conditions, impacting oxygen levels.

Area of Science:

  • Environmental Engineering
  • Water Quality Monitoring
  • Wastewater Treatment

Background:

  • Dissolved oxygen (DO) is critical for aquatic ecosystems and wastewater treatment processes.
  • Sewer systems are complex environments where DO dynamics are influenced by multiple factors.
  • Understanding DO variations is essential for managing sewer system health and preventing pollution.

Purpose of the Study:

  • To continuously measure dissolved oxygen (DO) concentrations in an intercepting sewer over two months.
  • To investigate the diurnal variations and influencing factors of DO in a gravity sewer.
  • To develop and validate a conceptual model simulating DO dynamics in sewers.

Main Methods:

  • Continuous DO monitoring upstream and downstream of a 3.6 km gravity sewer.

Related Experiment Videos

  • Analysis of diurnal DO variations and correlation with wastewater organic matter and temperature.
  • Calibration and validation of a conceptual DO model incorporating bulk water, biofilm uptake, and reaeration.

    • Main Results:

    • Significant diurnal DO variations were observed, primarily driven by wastewater organic matter.
    • Sewer conditions shifted from aerobic to partially anaerobic as temperatures increased.
    • The conceptual model accurately simulated downstream DO concentrations using upstream measurements as input.

    Conclusions:

    • Wastewater composition and temperature are key drivers of DO fluctuations in sewers.
    • Increased temperatures can exacerbate oxygen depletion, leading to anaerobic conditions.
    • The developed model provides a reliable tool for predicting DO behavior in sewer systems.