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Title: Release of aged contaminants from weathered sediments: Effects of sorbate speciation on scaling of reactive transport

Abstract

Hanford sediments impacted by hyperalkaline high level radioactive waste have undergone incongruent silicate mineral weathering concurrent with contaminant uptake. In this project, we studied the impact of background pore water (BPW) on strontium, cesium and iodine desorption and transport in Hanford sediments that were experimentally weathered by contact with simulated hyperalkaline tank waste leachate (STWL) solutions. Using those lab-weathered Hanford sediments (HS) and model precipitates formed during nucleation from homogeneous STWL solutions (HN), we (i) provided thorough characterization of reaction products over a matrix of field-relevant gradients in contaminant concentration, partial pressure of carbon dioxide, and reaction time; (ii) improved molecular-scale understanding of how sorbate speciation controls contaminant desorption from weathered sediments upon removal of caustic sources; and (iii) developed a mechanistic, predictive model of meso- to field-scale contaminant reactive transport under these conditions. In this final report, we provide detailed descriptions of our results from this three-year study, completed in 2012 following a one-year no cost extension.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1054161
Report Number(s):
DOE/ER/64615
DOE Contract Number:  
FG02-08ER64615
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; contamination; remediation; speciation; transport

Citation Formats

Chorover, Jon, Perdrial, Nico, Mueller, Karl, Strepka, Caleb, O’Day, Peggy, Rivera, Nelson, Um, Wooyong, Chang, Hyun-Shik, Steefel, Carl, and Thompson, Aaron. Release of aged contaminants from weathered sediments: Effects of sorbate speciation on scaling of reactive transport. United States: N. p., 2012. Web. doi:10.2172/1054161.
Chorover, Jon, Perdrial, Nico, Mueller, Karl, Strepka, Caleb, O’Day, Peggy, Rivera, Nelson, Um, Wooyong, Chang, Hyun-Shik, Steefel, Carl, & Thompson, Aaron. Release of aged contaminants from weathered sediments: Effects of sorbate speciation on scaling of reactive transport. United States. doi:10.2172/1054161.
Chorover, Jon, Perdrial, Nico, Mueller, Karl, Strepka, Caleb, O’Day, Peggy, Rivera, Nelson, Um, Wooyong, Chang, Hyun-Shik, Steefel, Carl, and Thompson, Aaron. Mon . "Release of aged contaminants from weathered sediments: Effects of sorbate speciation on scaling of reactive transport". United States. doi:10.2172/1054161. https://www.osti.gov/servlets/purl/1054161.
@article{osti_1054161,
title = {Release of aged contaminants from weathered sediments: Effects of sorbate speciation on scaling of reactive transport},
author = {Chorover, Jon and Perdrial, Nico and Mueller, Karl and Strepka, Caleb and O’Day, Peggy and Rivera, Nelson and Um, Wooyong and Chang, Hyun-Shik and Steefel, Carl and Thompson, Aaron},
abstractNote = {Hanford sediments impacted by hyperalkaline high level radioactive waste have undergone incongruent silicate mineral weathering concurrent with contaminant uptake. In this project, we studied the impact of background pore water (BPW) on strontium, cesium and iodine desorption and transport in Hanford sediments that were experimentally weathered by contact with simulated hyperalkaline tank waste leachate (STWL) solutions. Using those lab-weathered Hanford sediments (HS) and model precipitates formed during nucleation from homogeneous STWL solutions (HN), we (i) provided thorough characterization of reaction products over a matrix of field-relevant gradients in contaminant concentration, partial pressure of carbon dioxide, and reaction time; (ii) improved molecular-scale understanding of how sorbate speciation controls contaminant desorption from weathered sediments upon removal of caustic sources; and (iii) developed a mechanistic, predictive model of meso- to field-scale contaminant reactive transport under these conditions. In this final report, we provide detailed descriptions of our results from this three-year study, completed in 2012 following a one-year no cost extension.},
doi = {10.2172/1054161},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {11}
}