(1) We are trying to remove tetrachloroethene (C2Cl4) from ground water by air stripping process. The maximum level of tetrachloroethene in the ground water is 5 mg/L and this must be reduced to 50µg/L using air stripping column. Here is given information; Liquid-phase mass transfer (m/sec) kL =19.86 x10-4 m/sec Wetted packing area (m2/m3 ), aw = 89.18 m2/m3 gas-phase mass transfer (m/sec), kG =4.94 x10-3 m/sec liquid flow rate, Qw = 8L/sec Temperature = 6ºC Column diameter = 3.0 ft Air -to-water ratio (QA/QW) = 40 (You need Appendix A for calculation of H) a) Determine liquid loading rate, L b) Stripping factor c) Height of transfer unit, HTU d) Number of transfer unit, NTU e) Height of packing in column, Z
(2) A tank containing 10,000 gallons of trichloroethane ruptures contaminating 3,000 ft2 of soil. Diffusion coefficient of 0.80cm2/sec. Trichloroethane saturation in air =500g/m3 Humidity = 0.4 Temperature = 20ºC Thickness of stagnant boundary layer = 0.5cm Specific gravity of Trichloroethane =1.321 i) Use Hartleyâs method to estimate the rate of volatilization of trichloroethane Ii) Calculate the time required for the entire 10,000 gallons to evaporate.
(1) We are trying to remove tetrachloroethene (C2Cl4) from ground water by air stripping process. The maximum level of tetrachloroethene in the ground water is 5 mg/L and this must be reduced to 50µg/L using air stripping column. Here is given information; Liquid-phase mass transfer (m/sec) kL =19.86 x10-4 m/sec Wetted packing area (m2/m3 ), aw = 89.18 m2/m3 gas-phase mass transfer (m/sec), kG =4.94 x10-3 m/sec liquid flow rate, Qw = 8L/sec Temperature = 6ºC Column diameter = 3.0 ft Air -to-water ratio (QA/QW) = 40 (You need Appendix A for calculation of H) a) Determine liquid loading rate, L b) Stripping factor c) Height of transfer unit, HTU d) Number of transfer unit, NTU e) Height of packing in column, Z
(2) A tank containing 10,000 gallons of trichloroethane ruptures contaminating 3,000 ft2 of soil. Diffusion coefficient of 0.80cm2/sec. Trichloroethane saturation in air =500g/m3 Humidity = 0.4 Temperature = 20ºC Thickness of stagnant boundary layer = 0.5cm Specific gravity of Trichloroethane =1.321 i) Use Hartleyâs method to estimate the rate of volatilization of trichloroethane Ii) Calculate the time required for the entire 10,000 gallons to evaporate.
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