Membrane, membrane module and process for cross-flow depth filtration

The membrane (1) is: formed form a three-dimensional cellulose fibers (length of 0.5-10 mm), which is strain hardened by a resin; reversibly compressible; constructed in such a way that its retention rate of the conventional plastic/ceramics membrane with a pore size of 0.2-1.2 mu m corresponds with the beer filtration; and provided with a spacer at the infiltrate side area. Kieselguhr and/or pearlites are non-homogeneously distributed in the membrane. A protective fabric/fleece layer is arranged between the spacer and the active layer (thickness of 2 mm). The structure of the membrane is non-homogeneously oriented on a direction perpendicular to the fiber density and the fiber lengths. The fibers and/or kieselguhr and/or pearlites are distributed in a filtrate side area (13) of the membrane compared to the side-side area of the membrane of the fine particles from the infiltrate to be filtered. Independent claims are included for: (1) a module element for the installation in the crossflow filter; (2) a connecting element for connecting filter pads; (3) a method for producing a module element; (4) a module for cross-flow filtration; (5) procedure for cross-flow filtration of a liquid; (6) procedure for filtration of a beverage; and (7) procedure for the cleaning of a crossflow filter membrane.