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Related Experiment Videos

External nitrification in biological nutrient removal activated sludge systems.

Z R Hu1, M C Wentzel, G A Ekama

  • 1Water Research Group, Department of Civil Engineering, University of Cape Town, Rondebosch, 7701, Cape, South Africa.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|May 31, 2001
PubMed
Summary

This study shows a new biological nutrient removal (BNR) activated sludge (AS) system can be intensified. It reduces sludge age and oxygen demand while improving sludge settleability for better wastewater treatment.

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Area of Science:

  • Environmental Engineering
  • Wastewater Treatment Technologies
  • Microbial Ecology in Wastewater

Background:

  • Conventional biological nutrient removal activated sludge (BNR AS) systems face challenges with sludge age, oxygen demand, and settleability.
  • Integrating external nitrification in a fixed media system offers a novel approach to BNR AS intensification.

Purpose of the Study:

  • To evaluate a BNR AS scheme with external nitrification for potential system intensification.
  • To assess the impact on sludge age, oxygen demand, sludge settleability, and nutrient removal efficiencies.

Main Methods:

  • Laboratory-scale investigation of the proposed BNR AS scheme.
  • Analysis of system performance under varying operational conditions.
  • Evaluation of nitrogen and phosphorus removal capabilities.

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Main Results:

  • The investigated scheme shows potential for significant BNR AS system intensification.
  • Major reductions in sludge age and oxygen demand were observed.
  • Significant improvements in sludge settleability were achieved.
  • High nitrogen removals were accomplished, even with high TKN/COD ratios.
  • Conditions favored the development of anoxic phosphorus accumulating organisms (PAOs) for anoxic phosphorus uptake.

Conclusions:

  • The BNR AS scheme with external nitrification offers substantial benefits for wastewater treatment intensification.
  • While anoxic phosphorus uptake is effective, aerobic phosphorus uptake appears more efficient.
  • Further engineering and economic evaluations are necessary for large-scale implementation.