An Agglomeration-Based Model for Colloid Filtration

2009 ◽  
Vol 43 (10) ◽  
pp. 3694-3699 ◽  
Author(s):  
Jaideep Chatterjee ◽  
Santosh Kumar Gupta
Keyword(s):  
Colloid Filtration

Migration Behavior of Bentonite Colloids through a Fractured Rock

2008 ◽  
Vol 1124 ◽  
Author(s):  
Yoshio Kuno ◽  
Hiroshi Sasamoto
Keyword(s):  
Ionic Strength ◽  
Fractured Rock ◽  
Breakthrough Curves ◽  
Initial Increase ◽  
Migration Behavior ◽  
Nacl Solution ◽  
Fracture Surfaces ◽  
Fracture Length ◽  
Colloid Filtration ◽  
High Level

AbstractBentonite colloids released into groundwater from the buffer in a geological repository for high-level radioactive waste may influence the migration of radioactive elements in fractures of the host rock. In the present study, column experiments were carried out to investigate the migration behavior of bentonite colloids in artificially fractured granite. The objective of the study is to determine whether the colloids are filtered by the fracture, considering the effects of the fracture length and the ionic strength of transporting solutions. Results indicate that bentonite colloids are not filtered if the transporting solution is dilute (i.e., distilled water or 10-4 M NaCl solution). This is evidenced by the observed tendency for normalized colloid concentrations in the column effluent (C/C0) to rapidly approach 1. An initial increase in the breakthrough curves is also observed at early stages of migration experiments involving more concentrated solutions (10-3 M NaCl solution), but the curves later evolve to an approximate steady state with C/C0 < 1. The amount of filtered colloids tends to increase with increasing fracture length. These results suggest that bentonite colloids can be filtered by interactions between the colloids and fracture surfaces, and that these interactions are affected by the ionic strength of the transporting solution. This migration behavior is simulated by a model of colloid migration, taking into consideration the effects of colloid filtration by fracture surfaces. The information on the filtration of bentonite colloids would contribute to a more realistic assessment of colloid effects on radionuclide migration.

Filtration by porous media: a microfluidics approach

2021 ◽  
Author(s):  
filippo miele ◽  
Marco dentz ◽  
Veronica morales ◽  
Pietro de Anna
Keyword(s):  
Porous Media ◽  
Time Lapse ◽  
Breakthrough Curves ◽  
Pore Scale ◽  
Lagrangian Analysis ◽  
Attachment Rate ◽  
Colloid Filtration ◽  
Heavy Tailed ◽  
Set Up ◽  
Continuous Injection

&lt;p&gt;The transport of colloids in porous media is governed by deposition on solid surfaces and pore-scale flow variability. Classical approaches, like colloid filtration theory (CFT), do not capture behaviours observed experimentally, such as non-exponential steady state deposition profiles and heavy tailed BreakThrough Curves (BTC). In the framework of CFT, a key assumption is that the colloid attachment rate&amp;#160;&lt;span&gt;&lt;span&gt;&lt;span&gt;&lt;span&gt;&amp;#119896;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt; is constant and empirically estimated via a posteriori macroscopic data fitting. We design a novel experimental set-up based on time-lapse microscopy and continuous injection of fluorescent monodisperse colloids into a folded microfluidics device (1mt total length) designed with a controlled level of 2D spatial disorder. This set-up allows us to i) measure both BTC and deposition profile over several orders of magnitude and ii) to perform particle tracking and Lagrangian analysis of single colloid's trajectories. Based on this analysis, we propose a stochastic model that takes into account pore scale heterogeneities in terms of correlation length, velocity and attachment rate distribution, that captures the anomalous behaviour shown by the experimental data.&lt;/p&gt;

Colloid Filtration in Fluidized Beds

1990 ◽  
Vol 116 (2) ◽  
pp. 299-313 ◽  
Author(s):  
George Sprouse ◽  
Bruce E. Rittmann
Keyword(s):  
Fluidized Beds ◽  
Colloid Filtration

Colloid Filtration in Surface Dense Vegetation: Experimental Results and Theoretical Predictions

2014 ◽  
Vol 48 (7) ◽  
pp. 3883-3890 ◽  
Author(s):  
Lei Wu ◽  
Rafael Muñoz-Carpena ◽  
Bin Gao ◽  
Wen Yang ◽  
Yakov A. Pachepsky
Keyword(s):  
Experimental Results ◽  
Dense Vegetation ◽  
Theoretical Predictions ◽  
Colloid Filtration

scholarly journals Colloid filtration prediction by mapping the correlation‐equation parameters from transport experiments in porous media

2015 ◽  
Vol 51 (11) ◽  
pp. 8995-9012 ◽  
Author(s):  
Tamir Kamai ◽  
Mohamed K. Nassar ◽  
Kirk E. Nelson ◽  
Timothy R. Ginn
Keyword(s):  
Porous Media ◽  
Correlation Equation ◽  
Colloid Filtration
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