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Title: Effect of chemical and physical heterogeneities on colloid-facilitated cesium transport

Abstract

A set of column experiments was conducted to investigate the chemical and physical heterogeneity effect on colloid facilitated transport under slow pore velocity conditions. Pore velocities were kept below 100 cm d -1 for all experiments. Glass beads were packed into columns establishing four different conditions: 1) homogeneous, 2) mixed physical heterogeneity, 3) sequentially layered physical heterogeneity, and 4) chemical heterogeneity. The homogeneous column was packed with glass beads (diameter 500–600 μm), and physical heterogeneities were created by sequential layering or mixing two sizes of glass bead (500–600 μm and 300–400 μm). A chemical heterogeneity was created using 25% of the glass beads coated with hydrophobic molecules (1H-1H-2H-2H-perfluorooctyltrichlorosilane) mixed with 75% pristine glass beads (all 500–600 μm). Input solution with 0.5 mM CsI and 50 mg L -1 colloids (1-μm diameter SiO 2) was pulsed into columns under saturated conditions. The physical heterogeneity in the packed glass beads retarded the transport of colloids compared to homogeneous (R = 25.0), but showed only slight differences between sequentially layered (R = 60.7) and mixed heterogeneity(R = 62.4). The column with the chemical, hydrophobic/hydrophilic, heterogeneity removed most of the colloids from the input solution. All column conditions stripped Cs from colloids onto themore » column matrix of packed glass beads.« less

Authors:
 [1];  [2]; ORCiD logo [1];  [3];  [3];  [1]; ORCiD logo [3]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
  3. Colorado School of Mines, Golden, CO (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE; Ministry of Trade, Industry & Energy, Republic of Korea
OSTI Identifier:
1432513
Grant/Contract Number:
NE0000719; AC05-76RL01830; 20141720100610
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Contaminant Hydrology
Additional Journal Information:
Journal Name: Journal of Contaminant Hydrology; Journal ID: ISSN 0169-7722
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Colloid-facilitated transport; Cesium; Physical heterogeneity; Chemical heterogeneity; Colloids

Citation Formats

Rod, Kenton, Um, Wooyong, Chun, Jaehun, Wu, Ning, Yin, Xialong, Wang, Guohui, and Neeves, Keith. Effect of chemical and physical heterogeneities on colloid-facilitated cesium transport. United States: N. p., 2018. Web. doi:10.1016/j.jconhyd.2018.03.012.
Rod, Kenton, Um, Wooyong, Chun, Jaehun, Wu, Ning, Yin, Xialong, Wang, Guohui, & Neeves, Keith. Effect of chemical and physical heterogeneities on colloid-facilitated cesium transport. United States. doi:10.1016/j.jconhyd.2018.03.012.
Rod, Kenton, Um, Wooyong, Chun, Jaehun, Wu, Ning, Yin, Xialong, Wang, Guohui, and Neeves, Keith. Sat . "Effect of chemical and physical heterogeneities on colloid-facilitated cesium transport". United States. doi:10.1016/j.jconhyd.2018.03.012.
@article{osti_1432513,
title = {Effect of chemical and physical heterogeneities on colloid-facilitated cesium transport},
author = {Rod, Kenton and Um, Wooyong and Chun, Jaehun and Wu, Ning and Yin, Xialong and Wang, Guohui and Neeves, Keith},
abstractNote = {A set of column experiments was conducted to investigate the chemical and physical heterogeneity effect on colloid facilitated transport under slow pore velocity conditions. Pore velocities were kept below 100 cm d-1 for all experiments. Glass beads were packed into columns establishing four different conditions: 1) homogeneous, 2) mixed physical heterogeneity, 3) sequentially layered physical heterogeneity, and 4) chemical heterogeneity. The homogeneous column was packed with glass beads (diameter 500–600 μm), and physical heterogeneities were created by sequential layering or mixing two sizes of glass bead (500–600 μm and 300–400 μm). A chemical heterogeneity was created using 25% of the glass beads coated with hydrophobic molecules (1H-1H-2H-2H-perfluorooctyltrichlorosilane) mixed with 75% pristine glass beads (all 500–600 μm). Input solution with 0.5 mM CsI and 50 mg L-1 colloids (1-μm diameter SiO2) was pulsed into columns under saturated conditions. The physical heterogeneity in the packed glass beads retarded the transport of colloids compared to homogeneous (R = 25.0), but showed only slight differences between sequentially layered (R = 60.7) and mixed heterogeneity(R = 62.4). The column with the chemical, hydrophobic/hydrophilic, heterogeneity removed most of the colloids from the input solution. All column conditions stripped Cs from colloids onto the column matrix of packed glass beads.},
doi = {10.1016/j.jconhyd.2018.03.012},
journal = {Journal of Contaminant Hydrology},
number = ,
volume = ,
place = {United States},
year = {Sat Mar 31 00:00:00 EDT 2018},
month = {Sat Mar 31 00:00:00 EDT 2018}
}

Journal Article:
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