Find the time that is necessary to raise the dissolved

Question

A 425-m³(15,000 ft³) basin filled with wastewater is to be aerated with 10 spargers, each sparger using air at the rate of 7:08 × 10^-3 m²/s.

Find the time that is necessary to raise the dissolved oxygen level in the wastewater from 8 × 10^-2to 2 × 10^-1 mmol/L if the temperature of the water is 283 K and the depth of the water above the spargers is 3.2 m.

The dissolved solids content will be low enough so that Henry's law will be obeyed, with a Henry's law constantof3.27×10⁴ atm/mole fraction.