De-carbonators or degassers are economically beneficial to many demineralization systems, because they reduce the feed water load to the Anion column and thus reduce the quantity of resin as well as caustic soda required for regeneration. Water from a cation exchanger is broken into small droplets by sprays and trays or packing in a de-gasser.
The water then flows through a stream of air flowing in the opposite direction. Carbonic acid present in the cation effluent dissociates into carbon dioxide and water. The carbon dioxide is stripped from the water by the air, reducing the load to the anion exchangers. Typical forced draft de-gasser are capable of removing carbon dioxide down to 10-15 ppm. However, water effluent from a de-gasser is saturated with oxygen. |
 |
Chemical Dosing System