The European waste catalog is the list of waste classification codes (European Waste Code, CER) according to Directive 75/442 / EEC, which defines the term waste in the following way: "any substance or object that falls into the categories reported in Annex I and of which the holder discards or has decided or is obliged to discard ". Annex I is referred to as the List of wastes and applies to all waste, whether destined for disposal or recovery. The CER codes are numerical sequences, composed of 6 digits combined in pairs (eg 03 01 01 bark and cork waste), aimed at identifying a waste, normally, based on the production process from which it originated. The first group identifies the chapter, while the second usually identifies the production process. The codes, originally 839, are...