But spray tower scrubber described in Figure-1 is the simplest and low-cost wet scrubber system in which water droplets are introduced at the top of an empty
chamber through atomizing nozzles and fall freely at their terminal settling velocities counter-currently through the rising dust particle-gas stream. The dust particles are then separated from the gas stream and collected in a pool at the bottom of the chamber. A mist eliminator is usually placed at the top of the spray tower to remove both excess clean water droplets and dirty droplets which are very small and thus are carried upward by the gas flow.