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Related Experiment Videos

Model-based evaluation of two BNR processes--UCT and A2N.

X Hao1, M C Van Loosdrecht, S C Meijer

  • 1The Research Centre for Ecological Economics and Environmental Technology, Shanxi University of Finance and Economics, Taiyuan, People's Republic of China.

Water Research
|July 27, 2001
PubMed
Summary

The new A2N wastewater treatment process enhances denitrifying dephosphatation, offering stable nitrogen removal and significant energy savings compared to the UCT process. It shows promise for efficient biological nutrient removal.

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Area of Science:

  • Environmental Engineering
  • Microbiology
  • Wastewater Treatment

Background:

  • Denitrifying P-accumulating bacteria (DPB) are crucial for biological nutrient removal (BNR) in wastewater treatment plants (WWTPs).
  • The modified University of Cape Town (UCT) process supports a high DPB population.
  • A novel two-sludge BNR process, termed A2N, was developed to optimize denitrifying dephosphatation.

Purpose of the Study:

  • To evaluate and compare the performance of the A2N process against a full-scale UCT-type WWTP under identical conditions.
  • To assess the efficiency of denitrifying dephosphatation in both BNR processes.
  • To quantify the operational benefits of the A2N process.

Main Methods:

  • Simulation-based evaluation using the Delft metabolical model for biological phosphorus removal and the ASM2d model for chemical oxygen demand (COD) and nitrogen (N) removal.

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  • Comparative analysis of full-scale UCT and designed A2N processes with identical inflow and effluent standards.

    • Main Results:

    • Both processes demonstrated denitrifying dephosphatation capabilities.
    • The A2N process exhibited more stable nitrogen removal performance.
    • Despite a 6% increase in excess sludge, the A2N process achieved significant savings: 35% in aeration energy, 85% in mixed liquor internal recirculation, and 30% in land occupation.
    • Low temperatures negatively impacted poly-P bacteria growth, particularly in the A2N process.

    Conclusions:

    • The A2N process is a viable and efficient alternative for BNR, offering superior nitrogen removal stability and substantial operational cost savings compared to the UCT process.
    • Further investigation into low-temperature performance is warranted for the A2N process.