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Related Experiment Videos

Temperature effect on aerobic denitrification and nitrification.

Shu-Guang Xie1, Xiao-Jian Zhang, Zhan-Sheng Wang

  • 1Department of Environmental Science and Technology, Tsinghua University, Beijing 100084, China. xsg00@mails.tsinghua.edu.cn

Journal of Environmental Sciences (China)
|October 18, 2003
PubMed
Summary

Biofilters can lose nitrogen without removing organic matter. Lower hydraulic loading improves aerobic denitrification, but low temperatures (below 10°C) hinder it, though autotrophic biofilms in bio-aerated filters (BAF) offer some protection.

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Area of Science:

  • Environmental microbiology
  • Water treatment technologies

Background:

  • Biofilters are crucial for wastewater treatment, particularly nitrogen removal.
  • Understanding nitrogen loss mechanisms and operational factors is vital for optimizing biofilter performance.

Purpose of the Study:

  • To investigate nitrogen loss in biofilters without organic removal.
  • To determine the impact of hydraulic loading and temperature on aerobic denitrification and nitrification.

Main Methods:

  • Experimental setup involving biofilters under controlled hydraulic loading and temperature conditions.
  • Monitoring of nitrogen species (ammonia, nitrite, nitrate) and organic matter removal.
  • Analysis of aerobic denitrification and nitrification rates.

Main Results:

Related Experiment Videos

  • Observed nitrogen loss in biofilters not linked to organic removal.
  • Lower hydraulic loading rates enhanced aerobic denitrification.
  • Aerobic denitrification was significantly inhibited below 10°C.
  • Nitrification rates remained high even with a temperature drop from 15°C to 5°C.

Conclusions:

  • Autotrophic biofilms in bio-aerated filters (BAF) can mitigate the negative effects of low temperatures on nitrification.
  • Optimizing hydraulic loading is key to improving aerobic denitrification efficiency.
  • Further research into nitrogen loss pathways in biofilters is warranted.