Regarding waste; nuclear waste can be turned into diamond batteries.
If they manage to release, the idea is that small cell batteries can self-recharge themselves practically forever (20,000ish years?). Battery dead? Remove it, swap it, wait. Battery dead? Insert the one you removed previously, the Uranium inside replenished the charge.
Neat stuff given that it is made from waste byproduct.
What makes its limitation 500 gallons “per day”?