Vertical tube with a gas inlet from underneath and a radial task of the scrubbing liquid from above over the whole tube cross section.
The gas and liquid flow through a counter-flow tube. Before the gas leaves the column at the upper end, entrained scrubbing liquid droplets are separated in an adequate droplet separator. In general, the column is combined with a container which contains or collects the scrubbing liquid. Occurring wastewater is conveyed by an overflow or a pump.