Oxygen and air demand

Indicative calculation of oxygen and air demand for aeration based on BOD5 and nitrogen load and aeration efficiency.

This is an indicative calculation of oxygen and air demand for aeration based on BOD5 and nitrogen loading and aeration efficiency.

Coefficient for BOD5 [kg O₂/kg BOD5]

Coefficient for Nc [kg O₂/kg N]

Population equivalent (PE) [–]

Nc per PE [g N/PE/day]

Aeration efficiency AE [%]

kh – hourly unevenness [–]

Number of aerators/elements [pcs]

Total O₂ demand [kg/day]

84.0

Required O₂ supply (via AE) [kg/day]

420.0

Air mass [kg/day]

1802.5

Required air volume [m³/day]

1538.9

Required air volume (corrected) [m³/h]

96.18

AE loading [m³/element/h]

4.81

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