Degassed water: Produced at very large scale as part of the steam production system in many petrochemical plants and refineries (etc.). Degassed water is required to supply the steam boilers as any air present is bad for the boilers themselves.
Mechanical deaerators (where steam is sparged through the water to drive off the dissolved air) remove dissolved air from around 10ppm down to 5ppb in newer units).
Chemical removal (using oxygen scavengers) is also possible (and commonly used in your central heating circuit to prolong its life), but would be too damn expensive at the kind of scale required in industry. (I'm currently designing a deaerator to process 350te/hr water, and its not a particularly big one).
The reason it may not have been noticed before is because we try at all costs to stop any oil getting into the system. (Oil is bad here). If any had, would the small amount of finely dispersed droplets have been noticed anyway?
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Degassed water: Produced at very large scale as part of the steam production system in many petrochemical plants and refineries (etc.). Degassed water is required to supply the steam boilers as any air present is bad for the boilers themselves.
Mechanical deaerators (where steam is sparged through the water to drive off the dissolved air) remove dissolved air from around 10ppm down to 5ppb in newer units).
Chemical removal (using oxygen scavengers) is also possible (and commonly used in your central heating circuit to prolong its life), but would be too damn expensive at the kind of scale required in industry. (I'm currently designing a deaerator to process 350te/hr water, and its not a particularly big one).
The reason it may not have been noticed before is because we try at all costs to stop any oil getting into the system. (Oil is bad here). If any had, would the small amount of finely dispersed droplets have been noticed anyway?