They recover the metals and leave behind what's called shredder residue it's their waste a very complex mixture of materials, but predominantly plastics.

It was suggested that the text should comprise a summary and a list of website citations on best available techniques and best environmental practices for operating shredder plants.

With regard to shredder plants for the treatment of end of life vehicles, the issues were considered very complicated and no new evidence had been found for formation of by products.