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 biofilter

Notes

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

Calculations