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1. 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 0.005 mg/L. Size the air

stripper by determining the cross-sectional surface area,packing height, and the air flow rate.Use the following information in your calculations: - Stripping factor = 5 · Temperature of the water = 25 °C; Henry's constant of benzene= 0.23 (dimensionless) - Groundwater flow rate = 200 gpm •KL a = 0.02/s · Contaminant concentration in the influent air = 0.

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