Engineering Hub: System Design, Drawings & BOQ

Oxygen, then air from the transfer efficiency.

CPCB

O2 = 1.5 kg/kg BOD; air = O2 / (0.23 × 1.2 × SOTE)

• 0.23 is the oxygen fraction and 1.2 kg/m³ is air density. Both are stated so the air figure can be checked.