A sprayer is installed inside the tower to spray a 1000 mm thick layer of raschig rings. In order to avoid drop dragging, a second 200 mm thick layer of raschig rings has been placed upstream to the sprayer. A neutralization solution container is placed beneath the tower. The solution circulation pump has a capacity of 55 Lts1′ with a head of 6 m. The suction fan has a max capacity of 300