Who sorts "no-sort" recycling?

Answer 1

According to the EPA:

"Regardless of the method used to collect the recyclables, the next leg of their journey is usually the same. Recyclables are sent to a materials recovery facility to be sorted and prepared into marketable commodities for manufacturing."

So it's done in a materials recovery facility.

Go to:
http://www.wpwma.com/mrf.htm
For info about just what you want. It's a festival of garbage sorting.