An important group of waste is chemical residues, which are often classified as hazardous waste. It is prohibited to dispose of these substances with general municipal waste or down the sewer.
Waste types classified as hazardous waste must be collected separately and handed over by the producer to authorised disposal companies. Waste producers must also provide appropriate data on the type of hazardous waste.
Depending on the type of waste, certain limit values for chemical components and their properties must be met.
Substances that can only be disposed of at very high costs should be avoided and replaced by suitable substances, where possible, that can be disposed of more economically and in an environmentally benign manner.
This would be hazardous waste:
Inorganic acids, acid mixtures and mordants
Bases, alkaline mixtures, and mordants
Washing and rinsing waters, containing metallic salts
Residues of alkali metals
wastes containing mercury (elemental Hg)
Silver-containing solutions and wastes
hydrocyanic acid and cyanides
Solvents, containing halogens
Bullets of gases