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Foam filter insert pore size continually varied as required by turbidity sensor-regulated external pressure unit.
: Becker, A.; Treuling, U.; Gohlke, U.; Jaeger, W.; Mudersbach, R.; Stegmann, S.

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DE 2000-10001141 A1: 20000113
DE 2001-10101313 A: 20010112
DE 10101313 A1: 20010726
Patent, Elektronische Publikation
Fraunhofer IAP ()

Die vorliegende Erfindung betrifft ein Filtrationsverfahren sowie eine Filtrationsvorrichtung zur Abtrennung von festen, fluessigen oder geloesten Stoffen aus einem Fluid. Hierbei wird das Fluid durch mindestens ein kompressibles Filter geleitet. Durch Beaufschlagung des Filters mit Druck wird das Filter an die abzutrennenden Stoffe angepasst und/oder die Filtereffektivitaet eingestellt.


DE 10101313 A UPAB: 20010914 NOVELTY - In a filtration process to separate solid, fluid or dissolved substances from a fluid, the substance is passed through one or more compressible filters. The filter can be especially subjected to a variable pressure by means of which the pore size is adapted in accordance with the substance to be separated and enhancing process efficacy DETAILED DESCRIPTION - The compressible filter material is polyurethane foam. Alternatively the filter material is made up of flakes from 0.1-50 mm preferably 5-15 mm in diameter. The fluid passes two or more times through the same filter or two filters arranged in series, and under increasing pressure. Also claimed is a suitable filter assembly (10) with a housing (12) with an inlet and outlet and a filter insert (44) which can be compressed or de-compressed with a suitable bellows assembly (18). One end of the bellows is fixed, and the other can move within the housing. Movement is effected by a piston (16) in a cylinder (14) in response to turbidity sensor (100) signals. USE - Deep bed filter for the extraction of pure filtrate of colloidal dimensions e.g. filtration of laundry water for re-use, removal of dye from effluent water, the removal of a copper complex, or the filtration of waste water containing suspended and dissolved solids. ADVANTAGE - The filter can be rapidly and continually adapted to changes in concentration and composition of the incoming liquid or gas.