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Dinitrogen oxide detection for nitrification failure early warning systems.

M D Butler1, T Stephenson, L Stokes

  • 1School of Water Sciences, Cranfield University, Bedford, UK. m.d.butler@cranfield.ac.uk

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|November 30, 2005
PubMed
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Nitrous oxide (N2O) can indicate nitrification failure in wastewater treatment. While N2O is released quickly during oxygen deprivation or ammonia shocks, its pattern shifts during partial nitrification failure, showing a continuous rise.

Area of Science:

  • Environmental Engineering
  • Wastewater Treatment Technologies
  • Biogeochemical Cycles

Background:

  • Nitrification is a crucial process in wastewater treatment for removing ammonia.
  • Previous studies suggested a correlation between nitrous oxide (N2O) and ammonia (NH3) in effluent, hinting at N2O's potential as an indicator of nitrification failure.
  • Non-invasive monitoring methods are desirable for early detection of process disruptions.

Purpose of the Study:

  • To investigate the potential of nitrous oxide (N2O) as a non-invasive predictor of nitrification failure in activated sludge systems.
  • To analyze the relationship between N2O emissions and operational conditions such as oxygen deprivation and ammonia shock loads.
  • To differentiate N2O response patterns under various nitrification failure scenarios.

Main Methods:

Related Experiment Videos

  • Experiments were conducted using two pilot-scale activated sludge plants with varying aeration tank and clarifier volumes.
  • Simulated oxygen (O2) deprivation and high ammonia (NH3) loadings were applied to assess N2O production.
  • N2O gas emissions and ammonia concentrations in the effluent were monitored under different operational conditions.

Main Results:

  • N2O gas was rapidly emitted upon oxygen deprivation or ammonia shock loads in the smaller pilot plant.
  • The observed N2O release did not consistently follow the expected time lag of ammonia in the effluent.
  • Experiments with the larger pilot plant confirmed reproducibility and revealed a distinct, continual rise in N2O during partial nitrification failure.

Conclusions:

  • Nitrous oxide (N2O) shows promise as an indicator for nitrification failure, particularly under conditions of oxygen deprivation and ammonia shock.
  • The dynamic N2O response differs between acute failure events and partial nitrification failure, with a continuous increase observed in the latter.
  • Further research into aeration basin hydrodynamics and mixing characteristics is warranted to fully understand N2O behavior and its predictive capability.