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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
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Effect of Media Nitrogen Concentration on Biofilter Performance.

Matthew J Gribbins1, Raymond C Loehr2

  • 1a Montgomery Watson , Tulsa , Oklahoma , USA.

Journal of the Air & Waste Management Association (1995)
|November 2, 2017
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Summary
This summary is machine-generated.

Nitrogen availability is critical for biofilter performance in removing volatile organic compounds (VOCs). Insufficient nitrogen limits microbial activity and reduces VOC elimination rates, especially at high toluene loading rates.

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Area of Science:

  • Environmental Engineering
  • Environmental Microbiology

Background:

  • Biofiltration is a technology used for treating volatile organic compounds (VOCs).
  • Nitrogen is an essential nutrient for microbial growth and activity in biofilters.

Purpose of the Study:

  • To determine the importance of nitrogen availability for biofilter performance.
  • To identify critical design and operational parameters for biofiltration of VOCs.

Main Methods:

  • A pilot-scale biofilter was operated to assess VOC removal.
  • Nitrogen levels (ammonia and nitrate) were monitored in areas of high microbial activity.
  • Toluene loading rates were varied to observe effects on biofilter performance.

Main Results:

  • Microbially accessible nitrogen was depleted at toluene loading rates of 30 g/m³-h or higher.
  • Nitrogen depletion significantly reduced the VOC elimination rate.
  • Mineralization of organic nitrogen was insufficient to meet microbial demand during high loading periods.

Conclusions:

  • Adequate microbially available nitrogen is crucial for sustained biofilter performance at high VOC loading rates.
  • Biofilter design and operation must account for nitrogen availability to prevent performance limitations.
  • Further research is needed to define the threshold nitrogen levels required to avoid limitations.