Hysteresis of colloid retention and release in saturated porous media during transients in solution chemistry

Environmental Science & Technology
Saeed TorkzabanS A Bradford

Abstract

Saturated packed column and micromodel transport studies were conducted to gain insight on mechanisms of colloid retention and release under unfavorable attachment conditions. The initial deposition of colloids in porous media was found to be a strongly coupled process that depended on solution chemistry and pore space geometry. During steady state chemical conditions, colloid deposition was not a readily reversible process, and micromodel photos indicated that colloids were immobilized in the presence of fluid drag. Upon stepwise reduction in eluting solution ionic strength (IS), a sharp release of colloids occurred in each step which indicates that colloid retention depends on a balance of applied (hydrodynamic) and resisting (adhesive) torques which varied with pore space geometry, surface roughness, and interaction energy. When the eluting fluid IS was reduced to deionized water, the final retention locations occurred near grain-grain contacts, and colloid aggregation was sometimes observed in micromodel experiments. Significant amounts of colloid retention hysteresis with IS were observed in the column experiments, and it depended on the porous medium (glass beads compared with sand), the colloid size (1.1 and 0.5 mum), an...Continue Reading

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Citations

Aug 7, 2012·Environmental Science & Technology·Gopala Krishna DarbhaThorsten Schäfer
Sep 18, 2013·Environmental Science & Technology·Saeed TorkzabanArash Masoudih
Jul 24, 2012·Journal of Contaminant Hydrology·Scott A Bradford, Hyunjung Kim
Nov 9, 2010·Journal of Contaminant Hydrology·Saeed TorkzabanTetsu K Tokunaga
Aug 27, 2010·Journal of Contaminant Hydrology·Lixia ChenTohren C G Kibbey
Oct 30, 2015·Water Research·Saeed Torkzaban, Scott A Bradford
Jul 5, 2015·Journal of Contaminant Hydrology·Saeed TorkzabanHenning Prommer
Jul 6, 2014·Journal of Contaminant Hydrology·Svantje TreumannDeclan Page
Jan 21, 2015·Journal of Environmental Quality·Scott A BradfordJiri Šimůnek
Apr 29, 2020·Environmental Science and Pollution Research International·Hongjuan Bai, Edvina Lamy
Oct 6, 2015·Journal of Environmental Quality·Qiulan ZhangS M Hassanizadeh
Sep 26, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Chongyang ShenYuanfang Huang
May 22, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Scott A BradfordAlexander Shapiro
Sep 11, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Scott A Bradford, Saeed Torkzaban
Jun 7, 2014·Environmental Science & Technology·Wenjing SangTammo S Steenhuis
Mar 5, 2014·Environmental Science & Technology·Thorsten KnappenbergerJames B Harsh

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