what hazardous waste that bolt and nut industry produce?

Question

type of that waste(name) and its composition.
how the way its hazard to human or environment?

Answer 1

heavy metals, unless they recycle that, which I don't see why they couldn't. I am sure they use petroleum for lubrication, that would be a waste after it is used, but I would think they would recycle that or at least ship it to the right place when done.