Activated sludge tank Optimisation of aeration (brush aerators)

Quantifying inhomogeneous mixing

An oxidation ditch installed with surface aerators was modeled using CFD combined with activated sludge model (CFD-biokinetic model). Plant's performance under different operational conditions was evaluated in terms of oxygen transfer and ammonium removal.

Major findings

  • Surface aerators due to their design limitations have a significant impact on oxygen transfer
  • Ammonium concentrations tend to accumulate at the bottom due to lower dissolved oxygen levels
  • Using more aerators do not lead to significant improvement in ammonium removal
  • Performance of the oxidation ditch could be improved by installing better aerators or devising a better aeration control strategy



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