Abstract: An apparatus for high-degree purification of liquid contaminated by solvent comprises a vessel (1) of flat configuration, the liquid (16) being caused to flow through the vessel at a given level (17) determined by an overflow (19) or the like. The liquid flows in a thin stratum above holed air outlet elements (21) separated by liquid compartments (23), said elements (21) distributing the purification air uniformly in the liquid in the form of small bubbles. The elements (21) preferably have the form of perforated tubes, arranged separated and in parallel transversely across the bottom (11) of the vessel. The residue concentration of solvent in the outlet water can be kept under 1 ppm.

Abstract: Solvent-treated objects are dried in a drying chamber having a drying zone and at least one transfer zone for introducing into and/or removal from the drying zone of the object. The drying zone is created by recirculating drying air at high air flow rate by selectively sucking air from and blowing air into the drying zone and by removing recirculated solvent-carrying air from the drying zone by suction to provide a negative pressure in the drying chamber with greatest negative pressure in the drying chamber in the drying zone. Removed drying air is preferably passed through a solvent recovery carbon filter.