Determine depths of packing and surface areas between 4 m and 8 m for a countercurrent air-stripping lower to treat well water to reduce tetrachloroethylene from 100 μg/l to 2 μg/l, trichlorethylcnc from 25 to 2 μg/l, and cis-l,2-dichloroethylene from 70 to 2 μg/l. The design flow rate is 44 l/s, and the lowest temperature anticipated is 7°C, based on groundwater temperature and cooling in the tower. The following data are based on pilot- scale packed-colunm tests:
(1) Henry's law constants for tetrachloroethylene, trichloroethylene, and cis-l,2,-dichloroethylene are 0.30, 0.21, and 0.094 at 7°C, respectively.
(2) Assume the mass transfer coefficient for the most efficient and cost-effective commercial packing is 0.015 s 1 for all three compounds.
(3) The optimum air-to-water ratio is 20:1.
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