A new Ozone based CO2 experiment? - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 12-10-2007, 02:00 PM Thread Starter
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A new Ozone based CO2 experiment?

A few years ago I was making a batch of cement based rocks for a Reef Aquarium and soaking them in water to stabilize the ph. The process was going very slowly.
I have a small Ozone generator I bought from E-bay for under $45.00. I ran the output from the O3 generator through a bottle filled with wet aquarium carbon then through an air stone in the vat with the rocks. I Ph dropped dramatically. From around 11 to 8 with in a few hours. I discontinued the use when I feared the acid would weaken the cement mix. I did not do any more follow up experiments. Just in case you dont know, ozone is made when you apply a charge to the usually stable O2 molecule that is in air. The molecules take on another Oxygen atom creating O3. This is unstable and does damage to carbon based objects such as car tires. This is the primary cause of "dry rot" of ruber things such as latex gloves, etc. Ozone is used in the fire reclamation industry. They put the furnature with smoke damage in a sealed room filled with O3 for several days. The extra Oxygen atom combines with the carbon in the smoke smell and converts it to CO2 to be gasses off. The smoke smell is eliminated.

One word of caution. It ozone is passed over dry carbon it can get very hot and may even burst into flame. That is why the ozone was passed through wet carbon.

Hope someone gives this a try.

Aquayne
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post #2 of 8 (permalink) Old 12-10-2007, 03:26 PM
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Seems impractical for aquarium use... You wouldn't want to inject O3 into your tank as well.. ???


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post #3 of 8 (permalink) Old 12-10-2007, 03:32 PM Thread Starter
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No ozone would go into the aquaria. Passing through the carbon is how you get rid of it. Reef Aquariums do it all the time when they use ozone in protein skimmers. All that passes through is co2 and regular air.
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post #4 of 8 (permalink) Old 12-10-2007, 03:44 PM
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Yes, it will work, not sure on the practicality of it though, adding O3 to reduced carbon, the activated stuff, should oxidize it aggressively into CO2.

Sort of like the Carbon Plus electroylosis unit but with O3 instead of electrical current, but the O3 is produced by electric current anyway.....the carbon plus just takes that's a step back and makes it simpler is all, and current is easy to control the rate, O3? not so much so..........

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post #5 of 8 (permalink) Old 12-10-2007, 05:55 PM Thread Starter
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There are two easy methods to control the O3. One is to look at the size of the generater itself. Mine is very small. I believe they are rated by cubic liters per hour of air output.The other simpler method is by adjusting the volume of air that passes through the ozone generator to the carbon. By the way, I made the reaction chamber for the carbon by drilling two holes in the top of a pop bottle cap. I then passed a long peice of rigid airline tubing all the way to the bottom through the carbon and water and up through the cap. The other hole was filled with a short piece of rigid tubing. The air came from the air pump, through the Ozone generater, down through the carbon reaction chamber then to an air stone. To adjust the amount of O2 just decrease the air flow from the air pump. You could even put the thing on a timer to come up with the sun to avoid dropping the PH too much at night.
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post #6 of 8 (permalink) Old 12-10-2007, 06:06 PM
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and what would you use as the carbon?

Oil? We're talking about a fire hazard here right?


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post #7 of 8 (permalink) Old 12-10-2007, 10:31 PM Thread Starter
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I used granular activated charcoal/carbon and water to fill in the gaps. As long as the carbon is moist no problems.
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post #8 of 8 (permalink) Old 12-11-2007, 03:40 PM
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But it's still a step removed from electrolysis..........you may as well do that, you can do the same thing with Yeast or with HCL and baking soda/limestone etc.

I think you'd do best to separate the entire O3/Carbon chamber from the entire tank water, allow the gas to build up inside a reactor, then vent that to the tank.

Seems like a big old messy item vs a gas tank or the Carbo plus.

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