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Related Experiment Videos

Advanced nitrogen elimination by encapsulated nitrifiers.

M Sievers1, K D Vorlop, J Hahne

  • 1CUTEC-Institut GmbH (Clausthal Environment Technology Institute), Leibnizstr. 21+23, 38678 Clausthal-Zellerfeld, Germany.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|December 20, 2003
PubMed
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Encapsulated nitrifiers in gel beads enhance selective nitrification of settled sewage. This process enables significant nitrate removal in a subsequent denitrification step without external carbon sources.

Area of Science:

  • Environmental Science
  • Microbiology
  • Wastewater Treatment

Background:

  • Nitrification is a key process in wastewater treatment.
  • Optimizing nitrification selectivity and efficiency is crucial for effective nitrogen removal.
  • Current methods often require external carbon sources for subsequent denitrification.

Purpose of the Study:

  • To investigate the efficacy of encapsulated nitrifiers for selective nitrification.
  • To assess the potential for subsequent denitrification without external carbon.
  • To determine optimal conditions for nitrogen removal from settled sewage.

Main Methods:

  • Utilizing a mixed population of nitrifiers encapsulated in gel lens beads.
  • Conducting lab-scale treatment of settled sewage.

Related Experiment Videos

  • Operating at a hydraulic retention time (HRT) of 30-60 minutes.
  • Analyzing soluble chemical oxygen demand (SCOD) and nitrogen concentrations.

    • Main Results:

    • Achieved selective nitrification with reaction rates for SCOD oxidation (25-150 mg/L x h) and nitrification (50 mg N/h/L).
    • Demonstrated substantial nitrate elimination (up to 20 mg N/L) in post-denitrification without nitrate recycle or external carbon.
    • Identified effective nitrogen removal at COD/N-ratios of approximately 6.

    Conclusions:

    • Encapsulated nitrifiers offer a selective nitrification process for settled sewage.
    • The integrated nitrification-denitrification system can achieve significant nitrogen removal efficiently.
    • This approach reduces the need for external carbon sources in wastewater treatment.