In typical wet flue gas desulfurization Sulphur Dioxide (SO 2 is removed by using its chemical characteristics to combine with water

The flue gas containing SO 2 will enter the absorber and come in contact with sorbent liquid, usually Lime, CaOH 2 or Limestone CaCO 3

The sorbent liquid will then combine with the sulfite ions from the flue gas to form gypsum CaSO 4 calcium sulfIte CaSO 3

Next, spent scrubbing liquids are sent to clarifier where the insoluble gypsum is removed, and the water is returned to the scrubber system