Combined Depth and Cake Filtration Model Coupled with Flow Simulation for Flat and Pleated Filters. Issue 1 (20th November 2017)

• Record Type: Journal Article
• Authors: Iliev, Oleg; Kirsch, Ralf; Osterroth, Sebastian
• Is Part Of: Chemical engineering & technology. Volume 41:Issue 1(2018)
• Page Start: 70
• Page End: 78
• Publication Date: 2017-11-20
• Subjects: Cake filtration -- Depth filtration -- Filtration efficiency -- Numerical simulation -- Pleated filter; Chemical engineering -- Periodicals; Chemical processes -- Periodicals; 660.05
• DOI: 10.1002/ceat.201700115
• Languages: English
• ISSNs: 0930-7516

Abstract

Abstract: Filtration processes characterized by initial depth filtration, followed by a stage during which the cake acts as both a depth and surface filtering medium are studied. Such phenomena can occur especially for polydisperse dust. Based on one‐dimensional depth filtration modeling, a combined depth and cake filtration model is formulated and coupled with the fluid flow. The evolution of flow resistivity and filtration efficiencies is investigated in the case of relatively dilute suspensions and constant flow rates. Numerical simulations of single‐pass experiments are performed for both flat and pleated filter media. The model presented here is able to predict a nonlinear pressure drop for incompressible filter cakes due to the reduction of pore volume by particle deposition in the cake region. Abstract : A combined depth and cake filtration model is introduced which enables to model both pure depth and pure cake filtration. Hence, all intermediate scenarios can be considered, too. The resulting pressure drop in the cake stage is nonlinear, due to the reduction of pore volume in the filter cake. This alternative effect to cake compression is shown for flat and pleated filter media.