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Related Experiment Videos

Simultaneous nitrification and de-nitrification in MBR.

B Wang1, S He, L Wang

  • 1Water Pollution Control Research Center, Harbin Institute of Technology (HIT), 202 Haihe Road, Harbin, China 150090.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|February 8, 2006
PubMed
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Optimizing dissolved oxygen (DO) and C/N ratio in membrane bioreactors (MBR) is crucial for effective simultaneous nitrification and denitrification, achieving high pollutant removal rates.

Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Bioreactor Performance

Background:

  • Simultaneous nitrification and denitrification (SND) is a key process for wastewater treatment.
  • Membrane bioreactors (MBRs) offer advantages in achieving high-quality effluent.
  • Understanding the impact of operational parameters on SND in MBRs is essential for efficient performance.

Purpose of the Study:

  • To investigate the effects of dissolved oxygen (DO), C/N ratio, and pH on the performance of a bench-scale MBR for SND.
  • To determine the optimal conditions for simultaneous nitrification and denitrification in an MBR system.
  • To explore the underlying mechanisms of SND within the MBR.

Main Methods:

  • Bench-scale membrane bioreactor (MBR) experiments were conducted.

Related Experiment Videos

  • Variations in dissolved oxygen (DO) levels, C/N ratio, and pH were systematically applied.
  • Removal efficiencies of Chemical Oxygen Demand (COD), Ammonia Nitrogen (NH3-N), and Total Nitrogen (TN) were measured.

    • Main Results:

    • High removals of COD (96-98%), NH3-N (95-99%), and TN (60-92%) were achieved under specific conditions.
    • Dissolved oxygen (DO) significantly impacted NH3-N and TN removal, with optimal performance observed at 1 mg/L DO.
    • C/N ratio and pH showed significant influence on NH3-N and TN removal, while COD removal was less affected.
    • Optimal conditions identified: C/N ratio of 30, pH 7.2, 24°C, and DO of 1 mg/L, yielding 96% COD, 95% NH3-N, and 92% TN removal.

    Conclusions:

    • Stable operation and effective SND in MBRs require maintaining ecological factors like DO, C/N ratio, and pH within specific ranges.
    • Dissolved oxygen is a critical parameter for optimizing simultaneous nitrification and denitrification in MBRs.
    • The study provides valuable insights into the operational parameters influencing SND efficiency in MBRs, contributing to advanced wastewater treatment strategies.