Design an air stripping column to remove $1,1,1-$Tricholoroethane $($TCE$-$ C$2$H$3$Cl$)$ from water. The initial concentration of TCE is $1\mathrm{.}5$ mg$/$L and this must be reduced to

$65$ ug$/$L$.$ Use the following criteria: Water flow rate $=320$ gal$/$min$.$; water

temperature $=16\backslash$deg C; air temperature $=26\backslash$deg C; packing: use $2-$in Intalox saddles or

equivalent. $($Hints: For TCE you can use, KL $=20\mathrm{.}4$ cm$/$hr and for $2-$inch Intalox

saddles, a $=118$ m$2/$m$.$ You can assume d $=2$ ft and air$-$to$-$water ratio $($QA$/$Qw$)=$

$20$ and $2-$ft diameter column. Using the alternate method, the volume $($ZA$)$ of the packing in column is nearly: