For removal of dissolved oxygen, one way is to purge water with N2. How should I calculate the required amount of N2 as well as the flow rate. Because if the bubbling is too aggressively the surface of the water will be turbulent and some of the oxygen will be reabsorbed.
Four common techniques for the removal of dissolved oxygen from water have been examined: boiling at 1 atm, boiling under reduced pressure, purging with N2 and sonication under reduced pressure. After treatment, the residual oxygen in solution analysed by the Winkler method. Nitrogen purging for 20–40 min at flow rate of 25 mL/s was found to be the most effective oxygen removal method.
Boiling at 1 atm was found to be the least effective. None of the techniques evaluated here lead to complete removal of oxygen. The concentration of residual dissolved oxygen after purging for 20–40 minutes with nitrogen is 0.2–0.4 ppm.
But for more effective method to add Hydrazine oxygen removed 100%.
Prem Baboo, Thanks for your answer. But do the purging time and the flow rate depend on the volume of water? What would be the relationship between these parameters?
I'd suggest that access of air to the surface should be restricted so that there is a surface 'blanket' of N2
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