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Related Experiment Videos

Simultaneous nitrification-denitrification in slow sand filters.

George Nakhla1, Shaukat Farooq

  • 1Department of Chemical and Biochemical Engineering, University of Western Ontario, Ont., N6A 5B9, London, Canada. gnakhla@eng.uwoca

Journal of Hazardous Materials
|December 21, 2002
PubMed
Summary

Slow sand filters effectively remove wastewater solids and organics. This study shows they also achieve simultaneous nitrification-denitrification, significantly reducing total nitrogen (TN) and total Kjeldahl nitrogen (TKN) levels.

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Wastewater Management

Background:

  • Slow sand filters (SSF) are recognized for removing suspended solids (SS), turbidity, and organics.
  • Simultaneous nitrification-denitrification (SND) is a crucial process for nitrogen removal in wastewater treatment.

Purpose of the Study:

  • To investigate the capability of SSF for simultaneous nitrification-denitrification (SND).
  • To assess the impact of filtration rates, filter depth, sand size, and temperature on nitrogen removal efficiencies.

Main Methods:

  • Experimental analysis of SSF performance under varying operational parameters.
  • Measurement of effluent quality parameters including SS, turbidity, Biochemical Oxygen Demand (BOD5), Chemical Oxygen Demand (COD), total Kjeldahl nitrogen (TKN), and total nitrogen (TN).

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Main Results:

  • SSF achieved simultaneous nitrification-denitrification, yielding low effluent TKN (0.6 mg/l) and TN (1.5 mg/l).
  • Nitrification and denitrification efficiencies were inversely proportional to the square root of filtration rate and sand size.
  • Nitrification was most sensitive to filtration rate and sand size.

Conclusions:

  • Slow sand filters are effective for simultaneous nitrogen removal in wastewater treatment.
  • Filtration rate and sand size are critical factors influencing nitrogen removal efficiency in SSF.
  • Optimized SSF design and operation can achieve high-quality effluent with significantly reduced nitrogen content.