Wastewater at 600 gpm, containing 10 ppm (by weight) of benzene, is to be stripped with air in a packed column, operating at 25∘c and 2 atm, to produce water containing 0.005 ppm of benzene. the packing is 2-inch polypropylene flexirings. the vapor pressure of benzene at 25∘c is 95.2 torr. the solubility of benzene in water at 25∘c is 0.180 g∕100g. an expert∘in voc stripping with air suggests the use of 1,000 scfm of air (60 f, 1 atm). at these conditions, for benzene,