Air by degassing water?

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Any process carried out at a low pressure, can probably also be done in a continuous flow, after an orifice that reduces the pressure in a chamber, before the inlet to a pump that restores the outlet pressure. A separate pump would be needed to remove the gas from the chamber.

By coupling a hydraulic motor with a pump having a slightly greater capacity, better efficiency would be achieved. Driving the combination would take less power than an orifice and a pump.

 

When the water is at the boiling point there will be almost no dissolved gasses to remove.
The vapour pressure of water varies with temperature, you will always get some water vapour with the air.
You need some “steam” to be sure there is no air left in solution.
You may need to study the phase diagram for water or the steam tables.
Start here; https://en.wikipedia.org/wiki/Vapour_pressure_of_water

 

Maybe a cold condenser stage could produce liquid water from the recovered gasses.
There are air driers based on refrigeration. There are chemical air drier canisters that would have higher running costs and be expensive in high-flow wet situations. Find out what gasses, in what proportions, may be dissolved in the water.
What are you going to do with the recovered “air”, and why do you need to get it from water ?
What are your expected flow rates ?

 

Are you producing degassed water and getting O2 as a bonus or are you primarily trying to extract O2 from water.
Is the scrubber for CO2 ? What is your estimated CO2 yield per litre ?