Reverse osmosis process for the treatment of rinse water containing polyvalent metal cations

摘要

The present invention relates to a method for the treatment of rinse water from the purification of wet-chemically treated components having at least partially metallic surfaces containing polyvalent metal cations Me, wherein at least a portion of the rinse water Aa cross-flow filtration stage F or cascading a number n on Cross-flow filtration stages F runs, each filtration stage F being fed with the permeate vein of the previous filtration stage F and at least one reverse osmosis stage being present as a cross-flow filtration stage by means of the addition of at least one water-soluble chelating organic compound having at least one phosphonate group, such that a Blocking the reverse osmosis membrane is omitted, but at the same time the separation property of the same is not adversely affected by controlling the metered addition of the chelating compound and depending on the specific conductivity of the permeate of Umk ehrosmosestufe takes place.