Investigating the Effect of Packed Structures on Filter Cake Compressibility

Riess, Peter Michael Bandelt; Kühn, Michael; Först, Petra; Briesen, Heiko

doi:10.1002/ceat.202000451

Cited by 3 publications

(6 citation statements)

References 24 publications

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“…In these cases, the increasing size of the center region, where no particle can be inserted, must be considered. System (g) can be roughly compared to the structures of a Raflux or Pall ring, which have already been experimentally tested [5,22]. Future investigations should benefit from this research to find further numerical and practical correlations.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, very specific wall material properties would not be necessary to obtain such porosity increases in a rigid granular bed. Nevertheless, this would likely play a role in a highly compressible one, as seen in Bandelt Riess et al [5].…”

Section: Numerical Experimentsmentioning

confidence: 97%

“…Conversely, friction at the filter walls is known to consume part of the applied load, which should counteract compression. These two phenomena occur simultaneously during the process and can, therefore, be fruitfully set against each other [5]. Thus, adding more wall support through some random or structured packing should reduce filter cake compressibility, increasing porosity and throughput.…”

Section: Romanmentioning

confidence: 99%

“…In the field of cake filtration, Bandelt Riess et al [5,22] investigated similar phenomena using random and structured packings. Their effect was proposed as twofold: (1) a stationary effect, which, like a filter aid, provides a permeable structure with high porosity for the cake to accumulate; and (2) a transient effect, with which the packing's internal wall support counteracts the developing filter cake compression.…”

Section: Romanmentioning

confidence: 99%

“…Their effect was proposed as twofold: (1) a stationary effect, which, like a filter aid, provides a permeable structure with high porosity for the cake to accumulate; and (2) a transient effect, with which the packing's internal wall support counteracts the developing filter cake compression. Even though the transient effect was recently addressed in more detail [5], mechanistic explanations for the stationary one are still missing, which is the motivation of this study. To this end, numerical simulations based on discrete element method (DEM) have been identified as a useful tool for taking this systematic approach.…”

Section: Romanmentioning

confidence: 99%

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Assessing the wall effects of packed concentric cylinders and angular walls on granular bed porosity

2022

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The effect of added wall support on granular bed porosity is systematically studied to elucidate performance enhancements in filtration processes achieved by using inserts, as demonstrated experimentally (Bandelt Riess et al. in Chem Eng Technol 2018, 2021). Packed beds of spheres are simulated through discrete element method in cylinders with different internal wall configurations. Three containing systems are generated: concentric cylinders, angular walls, and a combination of both. Variations of particle size and wall friction and thickness are also considered, and the resulting granular bed porosities are analyzed. The porosity increase is proportional to the incorporated wall support; the combination of cylindrical and angular inserts displays the greatest effect (up to 26% increase). The sinusoidal porosity values near the walls are exhibited to clarify the effects. The presented method can change and evaluate granular bed porosity increments, which could lead to filtration process improvements, and the obtained behaviors and profiles can be used to explore additional effects and further systems. Graphical abstract

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Section: Discussionmentioning

confidence: 99%

Section: Numerical Experimentsmentioning

confidence: 97%

Section: Romanmentioning

confidence: 99%

Section: Romanmentioning

confidence: 99%

Section: Romanmentioning

confidence: 99%

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Assessing the wall effects of packed concentric cylinders and angular walls on granular bed porosity

2022

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Material Properties in Cake Filtration – Discrete Element Simulation of Compression‐Permeability Cells

et al. 2022

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This simulation study investigates the impact of material properties on the behavior of compressible filter cakes. A compression-permeability (CP) cell is used as a standard experimental technique for characterizing compressible cakes. It contains a bidisperse particle packing simulated by the discrete element method. Using this setup, a set of crucial material properties is varied and their influence on the macroscopic compression behavior as described by established fitting equations is studied. Sobol's sensitivity analysis is performed, and the results indicate that Young's modulus, the coefficient of sliding friction, and the surface energy density have the strongest impact on cake solidity and compressibility.

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Modelling sludge dewatering in treatment reed bed considering sludge deposit formation

Huong,

Tan,

Tang

et al. 2024

Model. Earth Syst. Environ.

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The accumulation of sludge deposits is a crucial factor in the dewatering efficiency of sludge treatment reed bed (STRB). This paper presents an improved one-dimensional process-based mathematical model to simulate the dewatering mechanism in STRBs, in which the compressible cake filtration (CCF) theory was implemented to simulate the sludge deposits accumulation on the surface of the reed bed, while the varying sludge deposit thickness was accounted for using the moving mesh method. The proposed model also included the dual porosity variably saturated flow model and the Penman–Monteith equation to describe the dewatering through gravity drainage and evapotranspiration, respectively. The results from the model were validated with experimental data from laboratory-scale STRBs treating septage. The simulation results showed that considering the sludge deposit layer as a specific flow resistance effectively avoids the overprediction of water infiltration rate in the reed bed. The predicted results showed excellent agreement with the actual data, where only five cases of the root mean square error were above 10% compared to the average effluent flux. Further, the effect of evapotranspiration was found to be insignificant within a short-term simulation. The consideration of the influence of sludge deposit formation on drainage dewatering using the CCF model and moving mesh model has delivered a more robust simulation for sludge dewatering in STRBs, and the proposed model is capable of facilitating the understanding of the interactions between the sludge dewatering in STRB with respect to the bed characteristics, hydraulic load, and solid load.

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Investigating the Effect of Packed Structures on Filter Cake Compressibility

Cited by 3 publications

References 24 publications

Assessing the wall effects of packed concentric cylinders and angular walls on granular bed porosity

Assessing the wall effects of packed concentric cylinders and angular walls on granular bed porosity

Material Properties in Cake Filtration – Discrete Element Simulation of Compression‐Permeability Cells

Modelling sludge dewatering in treatment reed bed considering sludge deposit formation

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