Filtering sludge material from industrial and municipal water, includes providing material on filtering medium, filtering sludge material by creating pressure difference to form filter cake and separating cake from medium

摘要

The filtration of sludge material from industrial- and municipal water comprises providing the sludge material on a filtering medium (5), filtering the sludge material by creating a pressure difference to form a filter cake at the sludge material and separating the filter cake from the filter medium by a separation unit. The filter cake is formed as a thin film (1) with a thickness of less than 2 mm. After the filtration, the film is subjected to a residual moisture reduction treatment by thermal drying. The separation speed of the film is controlled through a movement of the separation unit. The filtration of sludge material from industrial- and municipal water comprises providing the sludge material on a filtering medium (5), filtering the sludge material by creating a pressure difference to form a filter cake at the sludge material and separating the filter cake from the filter medium by a separation unit. The filter cake is formed as a thin film (1) with a thickness of less than 2 mm. After the filtration, the film is subjected to a residual moisture reduction treatment by thermal drying. The separation speed of the film is controlled through a movement of the separation unit. For controlling the thickness of the film, an adjustment units are used, which limit the cake-formation phase, and/or the structure of the film is influenced through condensing of the film or through forming of draining canals in the film. A filter auxiliary layer (3) is formed on the filter medium in a defined thickness and/or a defined surfaces profile, before forming the film, through partial submersion of the filter medium into a suspension or solution that contains the filter auxiliary layer material, or through spraying of a suspension or solution on the filter medium. Before the filtration, rough solid particle or fiber-like material is added to the sludge material. The filtrate is subjected to a radiation treatment. The surface profile of the filter auxiliary layer is influenced by the adjustment units for the homogenization and/or pore smoothening of the filter medium. An independent claim is included for a filter device for filtration of sludge material from industrial and municipal waste water.