Recycle or Reject?

What can be done with the used filters and oil replaced on your construction equipment and machines? Also what about empty oil barrels? I need an efficient and green solution for the big quantities of rejected oil, filters and barrel.

I found this interesting link about a company that recycles used filters after draining the oil from it. It is inspiring indeed.

Please, let me know how do you treat these wastes on your sites and construction fields.