Co2 and something to think about

To look into dry ice you would need to look at the expansion rate of the dry ice as it “melts”.

MrDitty what kind of ceramic disks are you using in your tanks?

The only seal of the tank is the water that builds up in the hinges and on the self of the tank. I will say that with this being a plant only tank I only open the top of the tank about once a month to do some trimming (I get about 2 5gallon buckets). For my ferts I over dose them every week putting them into one of the 2 canister filters.

RTR have you tried to do DYI on a tank as large as a 75 gallon tank? It dose not work very good.

zkt thanks.
 
zkt said:
Carry that reasoning even further and and decrease the bubble size to a point and the surface area becomes infinity. Since the smallest co2 bubble size attainable is a molecule, if follows that the best way to mix gas and water is when they are both a gas, Which we knew in the first place.
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First problem: the reaction to form carbonic acid is slow, and like all reactions requires a collision between the two molecules, this is less likely to occur in a gas phase than in liquid.

Second: You still need to deal with Gas-Liquid equilibrium, check out some Chem. Eng. texts.
 
Got nailed said:"RTR have you tried to do DYI on a tank as large as a 75 gallon tank? It dose not work very good."

????? I did not ever suggest DIY CO2 for a larger tank, or for any tank for that matter. A CO2 reactor is not a CO2 generator, but a device for dissolving gas CO2 in flowing water. Try Google.
 
My,my,my....
I certainly dont want to argue chemistry with a guy with chem in his name. Besides hes rite about it being a slow reaction and we evendont want carbonic acid anyway. We want disolved co2 gas. But the question is whether or not, when the water molecules condense, it brings significant amounts co2 with it. Its been way too many moons since I had P-chem. What do you think. ?
 
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I have been thinking about this, and no matter how many times I posted info back and looked stuff up this would keep going on until someone gave up. This point is as good as any for myself to back out of this.


If you want to see that it’s working then you can comes see and play with the tank.
 
I have tried something similar to what you are talking about.The problem with just putting the Co2 in the space above the tank is that with rigorous photosynthesis by plants not only Co2 will accumulate under the sealed lid, oxygen produced by the plants will also accumulate, meaning that it is not only Co2 that is going to be mixed into the water by your spray bar. So while you are adding Co2 the plants are producing o2 and if the lid is sealed there will will be a pressue build up under the lid you will need some place for excess gas build up to vent off, not only that as the day goes on more and more oxygen will accumulate meaning that more Co2 will have to be added to counter this. JMO but I don't believe this is the most efficent way to keep a high Co2 level, RTR mentioned this before, but a Co2 reactor would be much more effecient at dissolving Co2 into the water.
 
Sivic, I'm doing DIY on a 33g, and I'd consder that the upper limit. On a 55g it would be increadibly frustrating.

zkt, I'm not saying that it won't work, I think that we've gotten off track in our argument ;) . I'm just saying that it may not be the best way, but I am nonetheless intrigued by the concept and look forward to hearing the results.
 
The nature of the reactions involved with CO2 gas added to water mean that the acid is generated as part of the equilibrium. It is inherent in the process, and the acid is what we use as a measure when we employ the pH/KH/CO2 tables.
 
Chem- wish I had the time to play with the idea, but Its prolly not worth persuring anyway. The tried and true methods work well enough. Sivic - I feel that a dyi generator-injector isnt limited by tank size. Im doin a 30gal and could double it easily. Ive improved the co2 generator previously posted in the diy forum and will post the new and improved version soon.
 
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