mass transfer II

Please solve by hand and step by step

a contaminated groundwater from 5mg/L to 30ug/L. Use the tabulated data for water, and packing material, and determine the following design parameters for this stripping tower; a) The air flow rate in (m3/min). b) The diameter of the stripping tower in ( m). c) The height of each transfer unit (HTU) in (m) and number of transfer units (NTU). d) The total height of the air stripping tower ZT in (m). Note: (ZT=20%Z)