Aor B

Interfacial contact area per unit bulk volume of tower

Actual oxygenation rate

Temperature lapse rate

Biochemical oxygen demand

Five-day biochemical oxygen demand

Concentration of dissolved oxygen in water at any given moment at a corresponding temperature and pressure Carbonaceous oxygen demand

Concentration of dissolved oxygen in the effluent of the secondary sedimentation basin

Concentration of dissolved oxygen in Qo

Equilibrium concentration of oxygen in water at a particular temperature and pressure. This equilibrium concentration is also called the saturation concentration of the dissolved oxygen (DO) [Cos] at standard pressure [Cos] of the wastewater at field conditions Saturation DO at 20°C and standard pressure Concentration of dissolved oxygen in the wasted sludge Saturation dissolved oxygen

Factor to convert BOD5 concentrations to equivalent CBOD concentrations in terms of S

fn

Factor for converting the nitrogen in the wasted sludge to oxygen

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