The degassing is a process that allows the removal of carbon dioxide, present in the water, through a decarbonation tower.
Typically, the tower is made of fiberglass, or other corrosion-resistant material, and inside has a bed of filling bodies in polypropylene (rashing rings).
During operational phase, the water to be treated enters in the degaser from the top and is sprayed on the filling bodies via nozzles or an equivalent distribution system. The water passes through the bed from top to bottom, while the atmospheric air, blown by a centrifugal fan, passes through the bed in the other direction, thus opposing the fall of the water and, in this way, stripping the CO2.
The condensation system of the outlet air consists of a deminster, while the degassed water is collected in the bottom of the tower.
A very important factor for the proper stripping of the gas is the pH; in fact, it is planned a dosage of acid upstream of the treatment, to ensure the correct working conditions.
Through the Decarbonantion tower, the yield of CO2 removal varies between 85-90%, with the consequent reduction of TDS in the treated effluent; this involves a further advantage in the next treatment of Reverse Osmosis.