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Nitrogen utilization in a vapor-phase biofilter.

JiHyeon Song1, Javier Ramirez, Kerry A Kinney

  • 1Department of Civil and Environmental Engineering, Sejong University, Kwangjin-gu, 143-747 Seoul, South Korea.

Water Research
|September 27, 2003
PubMed
Summary
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Biofilter performance treating toluene and p-xylene is significantly influenced by nitrogen levels. Supplying adequate nitrogen enhances pollutant removal, but internal nitrogen recycling is crucial under limited conditions.

Area of Science:

  • Environmental biotechnology
  • Bioremediation of volatile organic compounds

Background:

  • Biofilters are effective for treating volatile organic compounds (VOCs) like toluene and p-xylene.
  • Microbial activity in biofilters is often limited by nutrient availability, particularly nitrogen.

Purpose of the Study:

  • To investigate the impact of media nitrogen levels on the performance of a lab-scale biofilter.
  • To quantify nitrogen utilization and recycling within the biofilm for toluene and p-xylene degradation.

Main Methods:

  • Lab-scale biofilter experiments were conducted using synthetic media.
  • Nitrogen balance calculations were employed to estimate nitrogen utilization and recycling rates.
  • Toluene and p-xylene removal efficiencies were monitored under varying nitrogen conditions.

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Main Results:

  • Biofilter performance was strongly correlated with normalized nitrogen levels in the synthetic media.
  • p-xylene biodegradation was more sensitive to nitrogen levels than toluene biodegradation.
  • Increased nitrogen supply improved toluene removal efficiency to over 99% and p-xylene to over 90%.

Conclusions:

  • Adequate external nitrogen supply is essential for maintaining high pollutant removal efficiencies in biofilters.
  • Significant nitrogen recycling occurs within the biofilm, especially under nitrogen-limited conditions.
  • External nitrogen supplementation is necessary to prevent severe nitrogen limitation and sustain biofilter performance.