oxygen concentration brine versus fresh water
oxygen concentration brine versus fresh water
(OP)
Are the O2 levels in brine lower then those in fresh water at a given temperature simply because the increased TDS of the brine prevents more oxygen from binding to other molecules?
Kevin
Kevin





RE: oxygen concentration brine versus fresh water
I am at all not knowledgeable in this field, but are you talking about a 'dynamic' or 'static situation', free mixed or bound after airation situation, free nature or 'stored' condinition, or theoretical possible absorbation values?
In a dynamic or 'real' situation I would imagine the real O2 content would depend more on the mixing dynamics than the actual binding possibillities.
Or am I completely wrong?
RE: oxygen concentration brine versus fresh water
Now to your original question, all the sources I've found agree that the "constant" changes with water chemistry, but I have been unable (with a lot of searching) to find anyone that would presume to quantify either the magnitude or the direction of the change. I've seen disolved O2 numbers for sea water and for distilled water over the years and they have never made sense--I'm thinking that the temperature effects are overwhelming the water chemistry effects, but the sample temperature is rarely captured with water samples so I've never been able to verify this. If anyone has a reliable algorithm for TDS vs. Henry's Law constant I'd love to see it.
David
RE: oxygen concentration brine versus fresh water
Somehow I am a seconder to David's concept;with specific typical reference to 'Sea Water'
Biggest Reservoire of Life contains Sufficient Oxygen absorbed/retained is in bulk nothing but mostly 'brine' of a kind.Accordingly I form the opinio that it is more the temperature (upto the liquid state of water) rather than other constituents wether dissolved,undissolved dispersed etc.
Best Regards
Qalander(Chem)
RE: oxygen concentration brine versus fresh water
gerhardl (Mechanical)
At this stage I was looking for some theoretical values.
zdas04 (Mechanical)
my brine source is from a solution mining stream for KCl and NaCl. I'm looking at de-oxyenating it using a vacuum deaerator driven by steam (rather then vacuum pumps).
Anyway the only O2 staturation data I could find for near staturated brine was a Dead Sea sample.
I'll keep looking.
RE: oxygen concentration brine versus fresh water
David Simpson, PE
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RE: oxygen concentration brine versus fresh water
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RE: oxygen concentration brine versus fresh water
David
RE: oxygen concentration brine versus fresh water
I have a pdf document by Nishri and Yaakov on Dead sea brine.
where do you want me to send it?
RE: oxygen concentration brine versus fresh water
Thanks
David
RE: oxygen concentration brine versus fresh water
It
http://water.usgs.gov/software/DOTABLES/
I would also check and see if there is a DO probe that will take your concentration of chlorides.
RE: oxygen concentration brine versus fresh water
I think I upload my brine doc correctly.
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RE: oxygen concentration brine versus fresh water
The presence of salt does reduce the solubility of O2 in water. Check the following article from Petroleum Technology Quarterly, Spring 1998. "Oxygen solubility in various alkanolamine/water mixtures" (see Figure 5).
http://www.gastreating.com/pdf/PTQ_Reprint.pdf (you may have to register). Why this is I leave to others.
Regards,Gunnar
RE: oxygen concentration brine versus fresh water
We used a 20 foot packed column with vacuum pumps at 28 inches Hg to remove air.
RE: oxygen concentration brine versus fresh water
interesting. I decided to do the same thing with my performance spec, leave the O2 rates the same as water at the design temperature.
Who manufactured your system. I'm having problems finding bidders for this type of de-aerator. Most vendors want to use a thermal de-aerator which has an expensive operating cost.
Instead of vacuum pumps I want to feed the eductor with a local steam source to pull a vacuum in the tower.
Thanks
RE: oxygen concentration brine versus fresh water
The operator now is: Equi Star Pipeline Operations
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