Animal by-product regulations put restrictions on how international catering waste can be handled, stored and disposed of in order to prevent the spread of disease. Usually, catering wastes are incinerated without recycling. There is little information available about this process. I have measurements of Hg, Fe, Cu, Ni, Cd, Zn, Pb, Na, K, (from bottom ash) and I need to compare them and have references of PCDD/PCDF.