The goal, I'd have to think, is to recycle all of society after it's been abandoned... every guard-rail, stop sign, bill-board, rail car, building.... capturing all the household chemicals... taking a house down to its nails basically... We clean up and leave 95% less footprint away from all water.
I would think we could up-scale something as basic as this, of course. maybe ten times - something the size of a semi-trailer not a Stadium?