Power generation from waste oil
I remember long and painful discussions about the subject matter in Europe several years ago when legislation was passed to ban what is still possible in the United States. Europeans have to give waste oil to the public waste collectors to allow for recycling simply because it was found that private re-use as here may cause the release of dioxine into the air, which would be a real health hasard. When doing so, never use recycled and be very careful with processed oil to avoid the problem.