You are evaluating an existing air stripper for the removal of 1,3-Dichlorobenzene at a temperature of 12°C. The packed tower has a height of 10.0 m and a diameter of 4.5 m, and it is operated at an air-to-water ratio of 33.0 and a water flow rate of 470 m3/h. What is the minimum required value for the overall liquid-phase mass transfer rate constant, KLa, to meet a treatment objective of 90% removal?