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Ammonium removal using a vertically moving biofilm system.

Michael Rodgers1, Xin-Min Zhan, Angela Casey

  • 1Department of Civil Engineering, National University of Ireland, Galway, Ireland.

Journal of Environmental Science and Health. Part A, Toxic/Hazardous Substances & Environmental Engineering
|October 10, 2003
PubMed
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This study shows a vertically moving biofilm system effectively removes ammonium-nitrogen (NH4-N) with up to 98.8% efficiency at 11°C. The system demonstrates good aeration and predictable removal kinetics.

Area of Science:

  • Environmental Engineering
  • Microbiology
  • Wastewater Treatment

Background:

  • Ammonium-nitrogen (NH4-N) is a common pollutant in wastewater.
  • Effective removal of NH4-N is crucial for environmental protection.
  • Conventional methods can be energy-intensive or less efficient at lower temperatures.

Purpose of the Study:

  • To investigate the efficiency and kinetics of NH4-N removal using a novel vertically moving biofilm system.
  • To evaluate the system's performance at a low temperature (11°C).
  • To assess the aeration efficiency of the vertically moving biofilm system.

Main Methods:

  • Utilized a vertically moving biofilm system with high surface area plastic media.
  • Biofilm modules were repeatedly moved vertically between air and wastewater.

Related Experiment Videos

  • Monitored NH4-N removal efficiency, areal removal rates, and dissolved oxygen (DO) concentrations.
  • Applied a zero-order empirical model to simulate ammonium removal kinetics.

    • Main Results:

    • Achieved maximum NH4-N removal efficiency of 98.8% at 11°C.
    • Observed areal NH4-N removal rates ranging from 0.68-1.94 g NH4-N m⁻² day⁻¹.
    • Demonstrated that ammonium removal kinetics, post-carbonaceous oxidation, follow a zero-order model.
    • Found the ammonium removal rate to be proportional to the square root of biofilm mass.
    • Confirmed good aeration efficiency through DO concentration monitoring.

    Conclusions:

    • The vertically moving biofilm system is highly effective for NH4-N removal, even at low temperatures.
    • The system offers predictable removal kinetics and efficient aeration.
    • This technology presents a promising solution for sustainable wastewater treatment.