Recommendations
Mechanized mixer for flash mixing (Aquaflash) and flocculation (Aquafloc)Percolator Biologic Filter Settling tank for percolator biologic filterAnaerobic lagoonFacultative pond: method based on surface load application rateSubmerged aerated biofilter

BOD and COD removal efficiencies in aerated submerged biofilters

Input data

Influet flow

Influent BOD

Influent COD

Media volume

Media specific area, in m²/m³ - see Note 1

Output data

Volumetric organic load - see Note 2

Superficial organic load - see Note 3

Expected BOD reduction

Expected COD reduction

Expected effluent BOD

Expected effluent COD

Description

This calculation is valid as a first approximation. It is applied only to organic volumetric loads between 3 and 4 kg BOD/(m³.d) and sewage temperatures around 20°C. Given the influent average flow, BOD and COD and the superficial area for a submerged aerated biofilter, estimates the expected remotions and outflow values of BOD and COD.

Submerged aerated biofilterSubmerged aerated biofilter

Notes

  1. The specific surface of the media must be greater than 350 m²/m³
  2. According to Brazilian Standard NBR 12209:2011, the applied organic volumetric load must be equal or lower than 4 kg BOD/(m³.d)
  3. According to Brazilian Standard NBR 12209:2011, the applied organic superficial load must be lower than 15 kg BOD/(m².d) - referring to the media specific surface.

References

  • GONÇALVES, Ricardo F. Curso soluções de tratamento de esgoto para pequenas comunidades e loteamentos. Módulo II. Vitória, ABES-ES. file:///C:/Disco%20D/Backup%20OS%2068/Area%20de%20Trabalho/Meu%20Local%20de%20Trabalho/Bloom%20Consultoria/Consultoria/ETE/2024/Hidrodin%C3%A2mica/modulo-2-5-filtros-aerados-submersos.pdf. Acessado em: 08/06/2024