A two-way coupled model for the co-transport of two different colloids in porous media

N. Seetha*, S. Majid Hassanizadeh

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Models for the co-transport of two different colloids commonly assume a one-way coupling. This is because often a large colloid and small colloid are involved. Therefore, they assume that the spread of smaller colloid is affected by the transport of larger colloids, but not the other way around. However, a number of studies have shown that this assumption is not valid, even for large and small colloids. Therefore, in this study, a two-way coupled model is developed to simulate the co-transport of two different colloids in porous media and their effect on each other. We have considered the interactions of the two colloids with the grain surface, kinetics of heteroaggregation (of the two colloids), and heteroaggregate deposition onto the grain surface. We assumed a first-order kinetic model to represent heteroaggregate formation and its deposition on the grain surface. The model is evaluated by fitting the experimental data reported in four different papers from the literature on the co-transport of clay colloids and viruses, bacteria and graphene oxide nanoparticles, and clay colloids and graphene oxide nanoparticles. The model performance is compared with the commonly-used one-way coupled model. The two-way coupled model is found to satisfactorily simulate most of the experimental conditions reported in the above papers, except for the co-transport of montmorillonite–adenovirus, and Staphylococcus aureus- graphene oxide nanoparticles.

Original languageEnglish
Article number103922
Pages (from-to)1-20
JournalJournal of Contaminant Hydrology
Volume244
DOIs
Publication statusPublished - Jan 2022

Bibliographical note

Funding Information:
The first author acknowledges the funding received from Department of Science and Technology (sanction no. DST/NM/TAP-AGRI/03/2019(G) IIT Delhi), Government of India. The second author wishes to thank the German Research Foundation (DFG) for supporting this work by funding - EXC2075 – 390740016 under Germany's Excellence Strategy, and acknowledge the support by the Stuttgart Center for Simulation Science (SimTech).

Publisher Copyright:
© 2021 Elsevier B.V.

Funding

The first author acknowledges the funding received from Department of Science and Technology (sanction no. DST/NM/TAP-AGRI/03/2019(G) IIT Delhi), Government of India. The second author wishes to thank the German Research Foundation (DFG) for supporting this work by funding - EXC2075 – 390740016 under Germany's Excellence Strategy, and acknowledge the support by the Stuttgart Center for Simulation Science (SimTech).

Keywords

  • Co-transport
  • Colloids
  • Heteroaggregation
  • Porous media
  • Two-way coupled model

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