Verfahren zum Bearbeiten von mit Fremdstoffen belasteten Fluessigkeiten, die beim Abbeizen von Lacken und/oder Farben anfallen

The invention relates to a process for the preparation of liquids loaded with foreign matter, said invention comprising (a) as required one or several preliminary cleaning stages, (b) filtration of the liquids using diaphragm filtration technology under pressure, (c) concentration of the filtration residue occurring in stage (b) by spray evaporation, and (d) as required the return of filtration permeate occurring in stage (b) to the work process. In a special form of the invention, a process is provided for the preparation of liquids occurring after the stripping of paint, varnishes and similar, said process comprising the collection of the occurring leach in a first vessel, collection of the rinsing water occurring in a second vessel, filtration of the leach and the rinsing water using diaphragm filtration technology under pressure, as required concentration of the occurring filtration residue by spray evaporation, separate collection of the various filtration permeates and return of the two permeates for re-use in the stripping process. Furthermore, a device for concentrating liquids loaded with foreign matter is provided.