Does anybody have trouble with high co2 levels in there water? We have high co2 levels in are raw water. We use Ro system then polish with DI tanks. The Ro passes most of CO2 and the DI removes it but it depletes the tanks very fast. We get about 8 days out of each tank.

I am assuming from your topic that you have analysed the incoming city water for CO2. Being a gas, it will pass freely through the membrane and into storage. CO2 then depletes the Anion portion of the Mixed Bed.

It would be interesting to know what part of the country you are in. CO2 is the big reason that you can't do a pH on DI water unless you have an inline probe. High quality water will pull CO2 out of the air and the water quality will drop. DI or an high quality water, RO can get that way, will have a Nitrogen blanket put on the top level of the storage tank to stop the intrusion of CO2.

CO2 + H2O = H2CO3 (Carbonic Acid) which drops the pH in storage.

There are ways to remove the CO2 in teh pretreatment section but a complete water analysis would be required to make any recommendation.

Doesn't really answer your question I guess but it is a start. Let me know where you are. If you are in the Southeast, I can help you.

Life is GOOD !!
wburcham1@aol.com

We are located in southwest Indiana. Not heard of nitrogen blanket how does it work? I have been looking at something called a Liqui-cel membrane contactor. Has anybody heard of using this to remove CO2? Celgard makes it. It is a little pricey but if it worked it would pay for itself.

How are patients affected if the water CO2 is too high?

DI tanks remove the CO2 before it is sent to loop. so there is no co2 that goes to the machines

It used to be a normal practice to inject CO2 into the bicarb to drop the pH so the bicarb wouldn't chalk up the machines. Interesting huh?

Southwest Indiana.....Our Family farm is in Bloomfield but that's another story.

Based on the high hardness that is prevelant in Southern Indiana, high CO2 is an interesting situation. Is the city using acid feed to reduce the hardness? WHat is the pH of your incoming water? What does the city say about the CO2 level?

Life is GOOD

Willie B

[This message has been edited by Willie Burcham (edited 04-02-2002).]

We have talked to city about problem. They are doing some test but haven't called back with results. ph of in coming water is 7.5 to 8.0

With a pH of 8, it would be difficult to have much co2 in the supply. Interesting....Can you give me some contact info and I'll give you a call. Would love to see your lab results. We'll talk.

wburcham1@aol.com