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Nitrogen removal using a vertically moving biofilm system.

M Rodgers1, D Burke

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

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|February 13, 2003
PubMed
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This study tested a new biofilm system for removing nitrogen from wastewater. The system effectively removed chemical oxygen demand and denitrified nitrate-nitrogen, proving simple to operate.

Area of Science:

  • Environmental Engineering
  • Wastewater Treatment Technologies
  • Microbial Ecology

Background:

  • Nitrogen removal from wastewater is crucial for preventing eutrophication.
  • Conventional wastewater treatment methods face challenges with efficiency and operational complexity.
  • Biofilm systems offer a promising alternative for enhanced nutrient removal.

Purpose of the Study:

  • To evaluate the efficacy of a novel experimental biofilm system for nitrogen removal from synthetic wastewater.
  • To assess the system's performance in terms of chemical oxygen demand (COD) removal and nitrogen transformation rates.
  • To determine the operational simplicity of the proposed biofilm system.

Main Methods:

  • A six-reactor system (anaerobic, anoxic, four aerobic) was employed.

Related Experiment Videos

  • Moving submerged plastic modules were used in anaerobic/anoxic stages; intermittently immersed modules in aerobic stages.
  • Wastewater temperature averaged 10°C, with a nitrate recycle flow twice the inflow to the anoxic tank.

    • Main Results:

    • The anoxic reactor achieved an average filtered COD removal rate of 2.22 kg COD/m³xd.
    • Nitrate-nitrogen denitrification averaged 0.42 kg NO3-N/m³xd in the anoxic reactor.
    • Nitrification averaged 0.12 kg NH4-N/m³xd in the second aerobic reactor.

    Conclusions:

    • The experimental biofilm system demonstrated significant efficacy in nitrogen removal and COD reduction.
    • The system's design, utilizing moving and intermittently immersed modules, proved effective under laboratory conditions.
    • The biofilm system is characterized by its simplicity in construction and operation, suggesting practical applicability.