How do recycling plants seperate different types of recyclables?

Question by I LOVE YOU BIOTCH!: How do recycling plants seperate different types of recyclables?
Like cans from plastics and such.

And how do recycling plants affect the environment?

Best answer:

Answer by J.
Most of it is done by hand.

If you look at the diversion of materials away from landfills, that is an impact.
If you look at the run off and potentials for soil contamination at such a location, you are also impacting the environment.

Add your own answer in the comments!