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Related Experiment Videos

Strategy for nitrogen removal from piggery waste.

E Choi1, Y Eum

  • 1Department of Civil and Environmental Engineering, Korea University, Seoul.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|October 17, 2002
PubMed
Summary

Optimizing nitrogen removal from wastewater, this study found biological methods effective up to 35°C. Higher temperatures increased ammonia stripping, while specific organic load ratios and reactor volumes are crucial for complete denitrification.

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Area of Science:

  • Environmental Engineering
  • Wastewater Treatment
  • Nitrogen Removal

Background:

  • Wastewater influent characterized by 20% solids, 40 g/L TCOD, and 5.5 g/L TKN.
  • Scraper-type separation yields influent suitable for nitrogen removal studies.

Purpose of the Study:

  • Determine optimal operating conditions for nitrogen removal from wastewater.
  • Evaluate the impact of temperature on nitrogen removal efficiency.

Main Methods:

  • Laboratory-scale and full-scale reactor studies.
  • Analysis of biological nitrogen removal, ammonia stripping, chemical coagulation, and activated carbon adsorption.
  • Assessment of temperature effects on nitrification and denitrification.

Main Results:

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  • 80-90% nitrogen removal achieved biologically up to 35°C.
  • At 45°C, nitrogen removal included 30% biological, 50% ammonia stripping, 14% chemical coagulation, and 6% activated carbon.
  • Struvite formation inhibited above 30°C.
  • Nitrification/denitrification saved 35% tank volume and 50% carbon at 25°C.
  • Optimal TCOD/TKN ratio > 6 and oxic/total volume ratio 0.5 for denitrification.
  • Lower organic loads prevent nitrification inhibition above 35°C.

Conclusions:

  • Optimal nitrogen loading rates estimated at 0.15 kg TKN/m3/d (summer) and 0.23 kg TKN/m3/d (winter).
  • Cooling facilities can increase nitrogen loads to 0.35 kg TKN/m3/d (2.5 kg COD/m3/d organic loading).
  • Wastewater temperature management is critical for efficient nitrogen removal and process stability.