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Full-scale experience for nitrogen removal from piggery waste.

Euiso Choi1, Daehoon Kim, Youngjin Eum

  • 1Korea University, Seoul. echoi@korea.ac.kr

Water Environment Research : a Research Publication of the Water Environment Federation
|August 27, 2005
PubMed
Summary

Optimizing nitrogen removal in piggery wastewater treatment requires careful management of reactor temperature, influent chemical oxygen demand (COD) to total Kjeldahl nitrogen (TKN) ratio, and alkalinity-to-TKN ratio for efficient wastewater treatment.

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Area of Science:

  • Environmental Engineering
  • Wastewater Treatment Technologies
  • Agricultural Waste Management

Background:

  • Piggery wastewater presents significant nitrogen pollution challenges.
  • Existing treatment plants exhibit variable nitrogen removal efficiencies.
  • Understanding key operational parameters is crucial for effective treatment.

Purpose of the Study:

  • To compare the nitrogen removal performance of three full-scale piggery wastewater treatment plants.
  • To identify critical factors influencing nitrogen removal efficiency.
  • To provide insights for optimizing piggery wastewater treatment processes.

Main Methods:

  • Comparative analysis of three full-scale treatment plants with varying loads and configurations (anoxic-aerobic, anaerobic-anoxic-aerobic).

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  • Evaluation of influent characteristics, including chemical oxygen demand (COD) and total Kjeldahl nitrogen (TKN).
  • Mass balance calculations (caloric, COD, alkalinity) to determine key performance indicators.

    • Main Results:

    • Plant 1 showed higher effluent COD and ammonium-nitrogen due to lower influent concentration but higher loads.
    • High operating temperatures in Plant 2 potentially inhibited nitrification.
    • Plant 3 required external carbon sources despite a higher influent TCOD:TKN ratio.
    • Optimal conditions identified: reactor temperature < 35°C, influent TCOD:TKN > 6, and alkalinity:TKN ratio > 3.

    Conclusions:

    • Successful nitrogen removal from piggery wastewater is contingent upon specific operational parameters.
    • Reactor temperature, influent TCOD:TKN ratio, and alkalinity-to-TKN ratio are critical for efficient nitrogen removal.
    • Optimized management of these factors can enhance the performance of piggery wastewater treatment plants.