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Explanation: "Sludge thinner disposal" or "waste thinner disposal".
You have to take "Schmutzverdünner - Entsorgung" together.
In automatic spray plants, the spray nozzles have to be "blown out" with thinners periodically to prevent build-up on the nozzle and thereby depositing unwanted tiny lumps on the painted surface. Particularly when colour changing, the whole system has to be blown out which produces a large amount of solvent waste.
This waste is fed to a settlement tank (usually ´with a conical bottom) where the paint solids etc, are first separated to form a sludge which is then removed at the bottom of the tank. The solvent can then be drawn of and re-cycled. Sometimes a cyclone is used as an intermediate separation facility (depends on the medium).