Using the 25-mm (1in.) Raschig rings, design an air stripper to treat 300 ug/L methylene chloride to the SDWA MCL. The design flow rate is 2800 m3/day (0.74mgd). Use a stripping factor of 5, a gas pressure drop of 80N/m2/m, and assume a temperature of 20C. the following pilot data are also available for the design. Pilot Column Height (m) 0 290 2 115 4 32 6 4