I was wondering if there was a way to take that capture and pressurized it into a CO2 tank.
I dont think there would be any easy way to pressurize it to the point of what you normally see in a co2 tank (up to 1000 psi). I'm sure the potential cost would far outweigh the benefit.
Curator of an ever growing fishroom that currently houses 17 tanks(72 bowfront, 2x55's, 2x29's, 2x20 highs, 20 long, 30 long, 38, 7x10's) many of which are planted; and a 55 gallon African Cichlid tank at work along with a few empty tanks here and there to be set up eventually!.
CO2 is very cheap. The cost of refilling a tank is mostly the labor and profit cost, not the CO2 cost. Your labor and equipment cost to pressurize CO2 to the liquid stage, about 800 psi, would be way beyond any savings you might eventually get.
How much would a decent sized CO2 tank be? Say one that would feed a 55gal for six months
A 10# cylinder might do a 55g for 6 months. A 20# would be good for closer to a year. figure $70-90 for a new 10# empty aluminum cylinder, plus shipping. Aquariumplants.com has cylinders, and there's somebody in the For Sale forum selling them as well. Aluminum is cheaper than SS, and looks nicer, but will get dinged up more easily. Industrial supply places swap cylinders more often than fill them (and will sell them as well), so you'd want a cheap SS cylinder if you go that route. Depends on where you're going to get your CO2 from.
Yes, CO2 is cheap. Because most places just swap cylinders, one will basically last you forever.
I have a 20 lb. CO2 cylinder I bought 20 years ago. Originally I had steel, but they swapped it for aluminum eventually. Refills started out at $20 and have gone up to $30 over the years. Each refill lasts me for over a year.