Water degassing using reverse osmosis membranes

The presence of dissolved corrosive gases CO2 and O2 in water causes corrosion of equipment and pipelines. As the water temperature increases, the mobility of oxygen molecules increases, and the corrosive aggressiveness of water increases.

The problem of removing oxygen and carbon dioxide from water is solved mainly in two ways. It is thermal and chemical degassing (deaeration).

Thermal degassing removes dissolved gases from the water in the deaeration column. The water in the state of saturation spreads on the plates of the deaeration column like a thin film. In this case, part of the water is evaporated, carrying with it dissolved gases that are released from the surface of the water when it boils. The larger the surface of water evaporation and the higher the saturation temperature, the more efficient the water degassing is.

 Gases are not removed by chemical degassing. They are only turned into inorganic compounds.

When using sodium sulfate

2Na2SO3+O2–>2Na2SO4           (1)

When using hydrazine hydrate

N2H4*H2O+O2–>3H2O+N2        (2)

The turning of carbon dioxide into bicarbonate ion (alkalization) occurs by the reaction:

NaOH+H2СO3=NaHCO3+H2O       (3)


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