Residual waste is the sorting category reserved for everything that you cannot recycle by sorting in the other containers.
Many may be in doubt as to whether they sort their waste correctly. If you are in doubt, it is better to throw your waste in residual waste than to sort it incorrectly, as you risk destroying an entire waste sorting that suddenly cannot be recycled.
Waste that is composed of several different materials that cannot be separated must be placed in the container for residual waste.
Residual waste must be combustible
Everything that ends up as residual waste must be able to be burned. That is the main rule. Therefore, it is clearly best if you recycle glass and metal in the correct waste categories, as both metal and glass require a lot of energy to burn.
Unclean sortings, such as napkins with leftover food, a pizza tray with oily residue or wet paper belong in residual waste, as they are no longer pure paper or cardboard products.