Theories of cake filtration and consolidation and implications to sludge dewatering

Lee, D.J.; Wang, C.H.

doi:10.1016/s0043-1354(99)00096-2

Cited by 91 publications

(44 citation statements)

References 106 publications

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“…This duration provides a uniform basis to compare results across experiments, and eliminates the effect of head loss through the cake deposit that formed in experiments operated beyond 5000 pore volumes, which is modeled differently (35). Results for Na-montmorillonite with u = 0.021, 0.11, and 0.53 cm/s are shown in Figures 2-4, respectively.…”

Section: Montmorillonite Clogging In Silica Sandmentioning

confidence: 99%

Hydrodynamic and Chemical Factors in Clogging by Montmorillonite in Porous Media

Mays

2007

Environ. Sci. Technol.

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Clogging by colloid deposits is important in water treatment filters, groundwater aquifers, and petroleum reservoirs. The complexity of colloid deposition and deposit morphology preclude models based on first principles, so this study extends an empirical approach to quantify clogging using a simple, one-parameter model. Experiments were conducted with destabilized suspensions of sodiumand calcium-montmorillonite to quantify the hydrodynamic and chemical factors important in clogging. Greater clogging is observed at slower fluid velocity, consistent with previous investigations. However, calcium-montmorillonite causes one order of magnitude less clogging per mass of deposited particles compared to sodium-montmorillonite or a previously published summary of clogging in model granular media. Steady state conditions, in which the permeability and the quantity of deposited material are both constant, were not observed, even though the experimental conditions were optimized for that purpose. These results indicate that hydrodynamic aspects of clogging by these natural materials are consistent with those of simplified model systems, and they demonstrate significant chemical effects on clogging for fully destabilized montmorillonite clay.

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Section: Montmorillonite Clogging In Silica Sandmentioning

confidence: 99%

Hydrodynamic and Chemical Factors in Clogging by Montmorillonite in Porous Media

Mays

2007

Environ. Sci. Technol.

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“…Since the early 1970s, the key test to measure sludge dewaterability is the capillary suction time (CST) test. The CST testing apparatus provides a simple, flexible, rapid, and inexpensive method to measure sludge dewaterability, which particularly supports the design of filter presses in the industry [1][2][3].…”

Section: Introductionmentioning

confidence: 95%

“…Consequently, almost half of the treatment costs can be committed to dewatering and disposal [1]. Sludge dewatering has been considered as one of the most expensive but also one of the least well understood elements of the water and wastewater treatment processes [2,3]. Since the early 1970s, the key test to measure sludge dewaterability is the capillary suction time (CST) test.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Sludge Floc Size and Water Composition on Dewaterability

et al. 2014

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In order to observe the impact of different water compositions on sludge dewaterability, assessments of floc sizes using a particle size analyzer and of sludge dewaterability based on the capillary suction time (CST) test were carried out. Synthetic raw water had small floc sizes, and synthetic domestic wastewater had both larger median floc sizes and a better correlation between sludge dewaterability and median floc sizes. The floc size distribution results showed that synthetic raw water is associated with a narrow particle size distribution. In comparison, synthetic domestic wastewater produced a wider distribution. However, the CST values were similar for both waters. Compared to synthetic wastewater, natural wastewater had the largest distribution with generally larger particle sizes.

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“…Regarding the theoretical studies, one could refer to the conventional cake infiltration theory, in which the slurry infiltrates across a membrane medium and is retained on the medium face to form a filter cake as shown in Figure 1 [2]. According to conventional cake infiltration theory, both the fluid phase and solid phase are treated as a continuum.…”

Section: Introductionmentioning

confidence: 99%

A Coupled CFD–DEM Simulation of Slurry Infiltration and Filter Cake Formation during Slurry Shield Tunneling

Zhang

Yin

2018

Infrastructures

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Tunneling in highly permeable ground using a slurry shield machine can be challenging because it is difficult to form the so-called filter cake on the tunnel face to transport the support pressure. Consequently, destructive accidents might happen, such as face instability and water inrush. How to form an efficient filter cake in time is crucial during engineering practice, especially in ground with high permeability. Various theoretical and experimental analyses regarding the formation of filter cakes have been conducted. However, due to the complexity of this problem, which has to incorporate the mechanical and hydraulic behaviors of the fluid-solid mixture system, few numerical simulations are found in the literature. In this paper, with the aid of a newly developed numerical tool, a coupled CFD (computational fluid dynamics)-DEM (discrete element method) simulation is established to study the slurry infiltration and filter cake formation during slurry shield tunneling. The slurry infiltration process is simulated by modelling the scheme of the infiltration column test, in which sedimentation behaviors of slurry particles are captured and compared with experimental results. The results show that the sedimentation behaviors of the slurry particles and filter cake formation phenomenon are well captured by simulations and in accordance with the experiments, which indicates the robustness of the coupled CFD-DEM simulation used in present work.

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Theories of cake filtration and consolidation and implications to sludge dewatering

Cited by 91 publications

References 106 publications

Hydrodynamic and Chemical Factors in Clogging by Montmorillonite in Porous Media

Hydrodynamic and Chemical Factors in Clogging by Montmorillonite in Porous Media

Impact of Sludge Floc Size and Water Composition on Dewaterability

A Coupled CFD–DEM Simulation of Slurry Infiltration and Filter Cake Formation during Slurry Shield Tunneling

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