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Title: The impacts of pore-scale physical and chemical heterogeneities on the transport of radionuclide-carrying colloids

Abstract

Independent of the methods of nuclear waste disposal, the degradation of packaging materials could lead to mobilization and transport of radionuclides into the geosphere. This process can be significantly accelerated due to the association of radionuclides with the backfill materials or mobile colloids in groundwater. The transport of these colloids is complicated by the inherent coupling of physical and chemical heterogeneities (e.g., pore space geometry, grain size, charge heterogeneity, and surface hydrophobicity) in natural porous media that can exist on the length scale of a few grains. In addition, natural colloids themselves are often heterogeneous in their surface properties (e.g., clay platelets possess opposite charges on the surface and along the rim). Both physical and chemical heterogeneities influence the transport and retention of radionuclides under various groundwater conditions. However, the precise mechanisms how these coupled heterogeneities influence colloidal transport are largely elusive. This knowledge gap is a major source of uncertainty in developing accurate models to represent the transport process and to predict distribution of radionuclides in the geosphere.

Authors:
 [1]
  1. Colorado School of Mines, Golden, CO (United States)
Publication Date:
Research Org.:
Colorado School of Mines, Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1434478
Report Number(s):
13-5008
13-5008
DOE Contract Number:  
NE0000719
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Wu, Ning. The impacts of pore-scale physical and chemical heterogeneities on the transport of radionuclide-carrying colloids. United States: N. p., 2018. Web. doi:10.2172/1434478.
Wu, Ning. The impacts of pore-scale physical and chemical heterogeneities on the transport of radionuclide-carrying colloids. United States. doi:10.2172/1434478.
Wu, Ning. Tue . "The impacts of pore-scale physical and chemical heterogeneities on the transport of radionuclide-carrying colloids". United States. doi:10.2172/1434478. https://www.osti.gov/servlets/purl/1434478.
@article{osti_1434478,
title = {The impacts of pore-scale physical and chemical heterogeneities on the transport of radionuclide-carrying colloids},
author = {Wu, Ning},
abstractNote = {Independent of the methods of nuclear waste disposal, the degradation of packaging materials could lead to mobilization and transport of radionuclides into the geosphere. This process can be significantly accelerated due to the association of radionuclides with the backfill materials or mobile colloids in groundwater. The transport of these colloids is complicated by the inherent coupling of physical and chemical heterogeneities (e.g., pore space geometry, grain size, charge heterogeneity, and surface hydrophobicity) in natural porous media that can exist on the length scale of a few grains. In addition, natural colloids themselves are often heterogeneous in their surface properties (e.g., clay platelets possess opposite charges on the surface and along the rim). Both physical and chemical heterogeneities influence the transport and retention of radionuclides under various groundwater conditions. However, the precise mechanisms how these coupled heterogeneities influence colloidal transport are largely elusive. This knowledge gap is a major source of uncertainty in developing accurate models to represent the transport process and to predict distribution of radionuclides in the geosphere.},
doi = {10.2172/1434478},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 24 00:00:00 EDT 2018},
month = {Tue Apr 24 00:00:00 EDT 2018}
}

Technical Report:

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