Question

6.11. Stripping of VOCs from groundwater with air. Groundwater at a rate of 1,500 gpm, containing three volatile organic compounds (VOCs), is to be stripped in a trayed tower witlh 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. Concentration, ppm Max. for Ground- Drinking Component K-value water water 1,2-Dichloroethane (DCA) Trichloroethylene (TCE) 1,1,1-Trichloroethane (TCA)275 60 650 85 120 145 0.005 0.005 0.200 Note: ppm -parts per million by weight.

Answer 1