Or launch it into the Sun..................
“Or launch it into the Sun..................”
People and my students always say that , my reply always the same. Mass to orbit is expensive to LEO...
The delta-v required to go from Earth’s surface to the Sun is approximately 31.5 km/s to 33 km/s, depending on the starting point and transfer method. This is the combined delta-v needed to escape Earth’s gravity (around 11.2 km/s from the surface) and to cancel out Earth’s orbital velocity (about 29.8 km/s). The total delta-v can vary depending on factors like the initial orbit and the chosen trajectory, such as a Hohmann transfer.
Ironically you would need nuclear powered.rockets for such a delta V requirement. Crazy expensive and if you had a accident and the payload didn’t make escape velocity and fell back at even LEO orbital velocity it would burn up all the carbon even in solid form. This would release all the C14 directly into the air the worst possible case.
No you turn the CO2 back to solid graphite and bury it in Permian age salt mines that are geologically stable for hundreds of millions of years. Or you drill down into geo stable granite like the MMW just did in Central Texas that granite batholith they just drilled is 1+ billion years old it will still be stable in a million , ten million plus years drill bores down that pack the waste in stainless steel then copper casing and than bentonite clay cement it in the bottom 2km of a 3km deep hole.
Or go to the Permian and drill into shale again stable for 100+ million years drill down under the oil producing strata and turn horizontal go 20000+ feet lateral with a slight toe up from the heal. Tractor said stainless clad copper cased waste up to the toe and all the way back till 500 feet from the heal again cement it all in with bentonite clay cement walk away it’s in stable strata problem solved forever millions of years stable it needs 50,000 for C14, 1 million for the four long lived fission products if you don’t use fast spectrum reactor to transmute them.
Every one of these is fast reactor fuel of excellence.
Americium 243: 7,370 years
Curium 247:(15.6x10^6) years
Plutonium 239: 24,000 years
Plutonium 240: 6,560 years
Americium 241: 432 years
Curium 244: 18 years
Neptunium 237: 2.14 million years
Actinium 227: 21.77 years
Neptunium 239: 2.4 days
All of these are long lived fission products they start out as less radioactive than natural uranium due to their long half lives but you don’t want them in the biosphere some can bioaccumullate.
technetium-99 (211,000) years
selenium-79 (327,000) years
zirconium-93 (1.61) million years
cesium-135 (2.3) million years
palladium-107 (6.5) million years
iodine-129 (15.7) million years)
Only Tc & Id are water soluble and when mixed with molten boronsilicate glass cannot leach into water at all. They would be cased in steel, copper , cement, well bore casing , more concrete then water impermeable shale or solid granite so totally immobilized.