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This content will become publicly available on March 31, 2019

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

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:
Grant/Contract Number:
NE0000719; AC05-76RL01830; 20141720100610
Type:
Accepted Manuscript
Journal Name:
Journal of Contaminant Hydrology
Additional Journal Information:
Journal Name: Journal of Contaminant Hydrology; Journal ID: ISSN 0169-7722
Publisher:
Elsevier
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE; Ministry of Trade, Industry & Energy, Republic of Korea
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
OSTI Identifier:
1432513