Companies, on the other hand have mechanised methods and this is a short review of one such machine.
So first the quinoa goes through a sieve that takes out some of the chaff and so forth, then it goes through a zig-zag of metal with water that is meant to soak it and hopefully take some skin off, then the last step is that it's bathed in water and rinsed of the skin and with it the saponin. The water and quinoa fall into a metal box with holes which they put in a centrifuge to take out as much water as they can. Then it's set to dry on a concrete slab on the compound.
They save as much saponin as they can, it's used for soap and as a natural insecticide. The waste-water is drained into a small pool, not recycled. They can process something like 25 quintals, a quintal is 100 pounds, of quinoa per hour. I'll try to upload a video of the whole process when I can.
Here is the link to the video: http://www.youtube.com/watch?v=K4wMBIlfky4