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Removal of fine-grained and thin filter cakes by a counter-current backwash treatment

Morsch, Patrick; Anlauf, Harald; Nirschl, Hermann


In industrial solid/liquid separation, the removal of fine particles (≤ 10 μm) in a suspension with a low solids content (0.01-1 v/v %) is a challenging and demanding task. This application takes place in a wide array of industrial production such as metal processing and treatment industries. In order to achieve the required purity, different types of filters like candle and leaf filter can be used. In Figure 1, the commonly used candle filters are shown inside the vessel (a), during filtration (b), and cake removal (c). In respect of the field of applications, the procedure of removal has revealed that there is potential for improvement in pressure difference and amount of backwash reflux. These process variables highly depend on the material properties like cohesion within the filter cake and adhesion of the filter cake onto the filter media. In order to guarantee the removal of the filter cake, the applied removal force has to be larger than the adhesive forces. Furthermore, to remove the filter cake in large fragments, the removal force has to be lower than the cohesive force. These two effects also depend on porosity, pH-value, and further properties; they can be reflected by and measured as shear and tensile strength of the filter cake. ... mehr

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DOI: 10.5445/IR/1000063589
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2016
Sprache Englisch
Identifikator urn:nbn:de:swb:90-635897
KITopen-ID: 1000063589
Erschienen in Filtech 2016, 11. - 13. Oktober 2016, Köln [L21 - Backwashing Filtration, Media Regeneration]
Schlagwörter Backwashing filter, Filter cake discharge, Adhesion, Cohesion
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