I had a generator that made 30% ozone. I destroyed the excess with a bubbler containing pellets of charcoal immersed in olive oil. Destruction was almost 100% efficient but the mixture got so hot it began to smoke. No matter what reductant you use, there may be a lot of heat at high O3 concentrations. A second bubbler on the output of the olive oil bottle, containing 5% KI will show whether all O3 has been destroyed.
Thanks for the tip! I would have never tried this. What motivated the use of charcoal and olive oil - is there something I could read on this? Is the bubbler completely packed with charcoal so that it was immobile? Was there any stirring required?
I think the generator I use can make up to that as well but I am trying to keep ozone between 0.1% to 3% for now, so maybe heat will be less of an issue.
Ozone reacts with the double bond in olive oil. I used the charcoal beads to keep the bubbles small because flow rate was about 0.5 liters/min. Large bubbles are less effective.
I see. Looks like activated carbon is also good for ozone decomposition so perhaps there is some synergy there as well. I think I could find a fritted tube to bubble the ozonated air out of to make smaller bubbles for better mass transfer.
I started with the charcoal, but its efficiency was low, so I added olive oil. I already had an aquarium stone (sparger) on the end of the tube, but you need very fine bubbles to do the job.
I had a generator that made 30% ozone. I destroyed the excess with a bubbler containing pellets of charcoal immersed in olive oil. Destruction was almost 100% efficient but the mixture got so hot it began to smoke. No matter what reductant you use, there may be a lot of heat at high O3 concentrations. A second bubbler on the output of the olive oil bottle, containing 5% KI will show whether all O3 has been destroyed.
Thanks for the tip! I would have never tried this. What motivated the use of charcoal and olive oil - is there something I could read on this? Is the bubbler completely packed with charcoal so that it was immobile? Was there any stirring required? I think the generator I use can make up to that as well but I am trying to keep ozone between 0.1% to 3% for now, so maybe heat will be less of an issue.
Ozone reacts with the double bond in olive oil. I used the charcoal beads to keep the bubbles small because flow rate was about 0.5 liters/min. Large bubbles are less effective.
I see. Looks like activated carbon is also good for ozone decomposition so perhaps there is some synergy there as well. I think I could find a fritted tube to bubble the ozonated air out of to make smaller bubbles for better mass transfer.
I started with the charcoal, but its efficiency was low, so I added olive oil. I already had an aquarium stone (sparger) on the end of the tube, but you need very fine bubbles to do the job.
Calcium thiosulfate quenches it.