I'm puzzled by this "recycled" bit.
Granted the only pressurised aircraft I've flown is the C421 but I fail to see how the air can be considered recycled.
From my limited knowledge of other aircraft systems you have a source of pressure air, usually the engines, which is fed to the cabin. The exit from the cabin is the outflow valve which exhausts overboard.
Unless the outflow valve exhaust is routed back to the engines to be re pressurised how can one consider the air to be recycled?
If people are referring to the movement of air solely within the cabin while it is there, how is that any different to any confined environment such as a theater or concert hall?
Waiting to be enlightened, and yes I accept that the B787 maybe quite different.