Recommendations
Sodium hypochlorite generator (ACQUANOX®)Conic inletHead loss in the filter bed during washingDimensions of a rectangleSubmerged aerated biofilterBOD and COD removal efficiencies in aerated submerged biological filters
Submerged aerated biological filter
Default

Input data

Flow

Output data

Description

Given the values of the average influent flow, average influent BOD, dimensions occupied by the support medium, specific area of ​​the support medium and the volume of air to be applied per mass of BOD, calculate the values of the volumetric organic load, surface organic load and air flow to apply.

Aerated biological filter

Grades

  • This depth must not be less than 1.60 m.
  • This specific surface area must not exceed 250 m²/m³
  • The applied volumetric organic load must be equal to or less than 1.8 kg BOD/(m³.d)
  • The applied surface organic load must be less than 15 g BOD/(m².d) (referring to the specific surface of the support medium); In cases also aiming at nitrification, the applied ammonia nitrogen load cannot exceed 1 g N / (m².d)
  • Aeration must be uniformly distributed, at a minimum rate of 30 Nm³ air/kg BOD applied to remove organic matter
  • Submerged aerated biological filters must have a secondary decanter to clarify the effluent.

References

  • ABNT. NBR 12299. Elaboração de projetos hidráulico-sanitários de estações de tratamento de esgotos sanitários. Rio de Janeiro: ABNT, 2011.