It is desired to strip trichloroethylene, O2HCl3, from a contaminated groundwater stream. The groundwater, which can be treated as a dilute water stream, will be fed to the top of the tower operating at 288 K and 1.013×105 Pa. An air stream, flowing countercurrent to the aqueous stream, is to reduce the TCE concentration from 40 to 5μg/L. At 288 K, the Henry's law constant for TCE-air system is 11.7×10-3 atm/(mol/m3 ).
a. Determine the moles of wastewater per mole of air if three times the minimum air stream is used.
b. Determine the concentration of the exiting air stream.