Dissolved Oxygen Saturation of Solution?

[sjohns4]

Can someone tell me, or direct me to a resource for calculating the DO saturation level of a solution? I suspect the clarified water at a water treatment plant may be near the saturation level and forming air bubbles in the filters. The DO of the water is only about 6mg/l, but with the addition of the lime, coagulant, and chlorine I suspect that may be all the solution can hold, but really dont know how to verify or calculate that.

Thanks,

Mike

 

[786392]

Are We talking/discussing about 'DA' Dissolved Air or 'DO' Dissolved Oxygen here!
However this is also not clear that what is the actual concern or problems associated if any having Air or Oxygen dissolved?
Kindly elaborate.

Best Regards
Qalander(Chem)

 

[rmw]

Do a search of this site. There is some good information. Oxygen saturates at a higher level in water than does the nitrogen from the air. I learned that on this site. Also, google the words " Henry's Law" and you will find a lot of stuff. There are web tools that will help you calculate it, but they are on my work computer and I am home. Sorry, but I found them, you will.

If you are bubbling air through your water then taking it through a pressure reduction or temperature increase (or both), then I guarantee you have air or the components of air coming out of solution.

rmw

 

[sjohns4]

Maybe Dissolved Air would be the better term to use, because I really dont know what the compisition of the gas from the bubbles is.

The problem with the air is the bubbles are apparently forming in the filter media and causing what is commonly termed "air binding" which just means the filters get pluged with air before they get pluged with the normal stuff water treatment plant filters are supposed to get plugged with.

Perhaps a followup question is how do you reduce the concentration of dissolved air in a solution, without causing a pressure drop?

 

[786392]

Is the process of air bubbling out is Counter current to the intended flow direction of under filtration fluid?

If such is the case then the design may need thorough review for the source as to from where

The excessive airflow gets generated!

The excessive air finds its way to get trapped!

Otherwise Can the situation be addressed through Co-Current flow conditions.

Thus minimising the interference through counter current conditions.

This is the 'food for thought' on system's mechanics as indicated.
As regards solubility of air or Oxygen please follow rmw 's sdvice.

Best Regards
Qalander(Chem)