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Related Experiment Videos

Denitrifying phosphorus removal in a continuously-flow A2N two-sludge process.

Yong-Zhen Peng1, Ya-Yi Wang, Masuo Ozaki

  • 1College of Environmental and Energy Engineering, Beijing University of Technology, P.R. China.

Journal of Environmental Science and Health. Part A, Toxic/Hazardous Substances & Environmental Engineering
|April 2, 2004
PubMed
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The Anaerobic-Anoxic/Nitrification (A2N) system efficiently removes phosphorus and nitrogen from wastewater. Optimal conditions involve a COD/TN ratio of 6.49, 14-day SRT, and specific flow rates for sludge bypass and return.

Area of Science:

  • Environmental Engineering
  • Microbiology
  • Wastewater Treatment

Background:

  • The Anaerobic-Anoxic/Nitrification (A2N) system is a two-sludge process for simultaneous phosphorus and nitrogen removal.
  • Polyphosphate-accumulating organisms (PAOs) utilize organic substrate and nitrate for enhanced biological phosphorus removal under anoxic conditions.
  • This process mitigates competition for organic matter and prevents overgrowth of nitrifying bacteria by heterotrophs.

Purpose of the Study:

  • To evaluate the phosphorus removal capacity of a modified A2N two-sludge system.
  • To investigate the impact of key operational parameters on nutrient removal efficiency.
  • To determine optimal conditions for phosphorus and nitrogen removal in the A2N system.

Main Methods:

  • A lab-scale A2N system was operated continuously for 260 days using domestic sewage.

Related Experiment Videos

  • System performance was monitored by analyzing influent and effluent nutrient concentrations.
  • Key factors investigated included the influent Chemical Oxygen Demand (COD) to Total Nitrogen (TN) ratio, Sludge Retention Time (SRT), Bypass Sludge Flow rate (BSF), and Return Sludge Flow rate (RSF).

    • Main Results:

    • The A2N system demonstrated efficient removal of both phosphorus and nitrogen.
    • Optimal influent COD/TN ratio was determined to be approximately 6.49.
    • An SRT of 14 days was found to be optimal.
    • Optimal BSF and RSF were established at 26%-33% of the influent flow rate.

    Conclusions:

    • The modified A2N system is highly effective for simultaneous phosphorus and nitrogen removal from domestic wastewater.
    • Operational parameters such as influent COD/TN ratio, SRT, BSF, and RSF significantly influence system performance.
    • Achieving optimal conditions maximizes nutrient removal efficiency and process stability.