Groundwater at a rate of 1,500 gpm, containing three volatile organic compounds (VOCs), is to be stripped in a trayed tower with air to produce drinking water that will meet EPA standards. Rele- vant data are given below. Determine the minimum air flow rate in scfm (60°F, 1 atm) and the number of equilibrium stages required if an air flow rate of twice the minimum is used and the tower operates at 25°C and 1 atm. Determine the composition in parts per million (ppm) for each VOC in the resulting drinking water. Component 1,2-Dichloroethane (DCA) Trichloroethylene (TCE) K-value 60 650 1,1,1-Trichloroethane (TCA) 275 Note: ppm = parts per million by weight. Concentration, ppm Ground- water 85 120 145 Max. for Drinking water 0.005 0.005 0.200

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