Determinethe power requirements of the mechanical aerators (kg O2/kWh) and the total number of aerators needed under the field conditions (15 C, 760 mm Hg). Each aeratorhas a capacity of 15 kWh and daily oxygen requirement is 260 kg O2.

Standard oxygen transfer rate (at 20 C and zero dissolved oxygen) : 2 kg O2/kWh

= 0.95 (salinity-surface tension correction factor),

= 0.9(oxygen transfer correction factor)

CL=2.5 mg/l

F = 1