. A packed-column air stripper is designed to reduce benzene concentration in the extracted groundwater. The concentration is to be reduced from 5 mg/L to .,005 mg/L. Size the air

stripper by determineing the cross-sectional surface are a, packing height, and the air flow rate.-- Stripping factor = 5 Temperature of the water = 25°C; Henry's constant of benzene = 0.23 (dimensionless) Groundwater flow rate = 200 gpm KLa = 0.02/s Contaminant conce ntration in the influe nt air = 0.