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Improving effluent quality in an oxidation ditch

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Oxidation ditch

Quantifying inhomogeneous mixing

An oxidation ditch was modelled in 3D using multiphase CFD combined with biokinetics (CFD-biokinetic model). The operational performance was evaluated at different conditions in terms of oxygen transfer and ammonium removal.

Major findings

  • High vertical and horizontal gradients of oxygen and nutrients were found
  • Ammonium concentrations accumulated at the bottom due to lower dissolved oxygen levels (brush aerators in this case)
  • Performance of the oxidation ditch could be improved by modifying the aerators

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