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Related Experiment Videos

Improving nitrogen removal in predenitrification-nitrification biofilters.

L Larrea1, A Abad, J Gayarre

  • 1CEIT, Environmental Engineering Section, 20018, San Sebastian, Spain. llarrea@ceit.es

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|February 3, 2004
PubMed
Summary

Filtered biodegradable COD entering nitrification biofilters significantly impacts nitrogen removal rates. High levels of slowly biodegradable COD compete for oxygen, reducing nitrification efficiency, especially at lower temperatures.

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Wastewater Management

Background:

  • Secondary nitrogen removal in urban wastewater treatment often employs nitrification biofilters.
  • Predenitrification processes aim to reduce COD before nitrification, but residual biodegradable COD can impact downstream processes.
  • Understanding the fate of filtered and particulate COD is crucial for optimizing biofilter performance.

Purpose of the Study:

  • To investigate the impact of filtered biodegradable COD and particulate COD from predenitrification on NH4-N removal rates in nitrification biofilters.
  • To elucidate the mechanisms of COD interference with nitrification processes.
  • To provide insights for improving the design and operation of urban wastewater treatment plants.

Main Methods:

Related Experiment Videos

  • Laboratory-scale study using a separated biofilter system for predenitrification and nitrification.
  • Application of a typical COD load to the predenitrification biofilter with optimized conditions.
  • Analysis of filtered biodegradable COD removal in the predenitrification stage.
  • Monitoring of NH4-N removal rates and nitrification performance in the subsequent biofilter.

Main Results:

  • Predenitrification achieved only 60% removal of filtered biodegradable COD, with 64% of slowly biodegradable COD passing to the nitrification biofilter.
  • The residual slowly biodegradable COD competed with nitrifiers for dissolved oxygen, leading to low nitrification rates (0.5 kgN/m3 x d) at 14°C.
  • Particulate COD accumulated on the biofilm, increasing its thickness and exacerbating oxygen limitation for nitrifiers.

Conclusions:

  • Residual slowly biodegradable COD from predenitrification significantly inhibits nitrification biofilter performance by causing oxygen competition.
  • Biofilm thickening due to particulate COD further limits nitrification activity.
  • Effective backwashing frequency is essential to mitigate the negative effects of particulate COD accumulation.