The waste gases are fed by up to twelve separate inlets into pre-scrubber using spray nozzles which eliminates any clogging at the input. The waste gases pass into the first scrubber stage and flow upwards through the first scrubber column filled with packing material. The column is supplied with the scrubbing liquid via spray nozzles. Due to the large surface of the packing material and the counter flow principle the optimal absorption of the waste gases is possible.
In the second stage a different scrubbing liquid is used. A demister is used to prevent the liquids from the two stages from mixing. The second scrubbing liquid allows an alternative chemistry to be used and so optimise the scrubbing of the waste gases. Ingredients of waste gases, which have not reacted in the first scrubber stage, can be better absorbed in the second scrubber stage. After the deposition of residual moisture of the gas flow in a demister the residual gases meet the strict standards of German air pollution law (TA Luft).