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Title: Technical Basis for Gas-Phase Vadose Zone Remediation Technologies at Hanford: A Review - 12186

Abstract

In situ vadose zone remediation approaches are being evaluated as potential options to mitigate the transport of inorganic and radionuclide contaminants from the vadose zone to the groundwater. Some of the candidate approaches are based on changing the contaminant or subsurface conditions in a way that slows downward migration of the contaminants through the vadose zone using amendments delivered in the gas-phase. Two promising approaches that have undergone testing at Hanford include soil desiccation to address technetium-99 contamination and ammonia-induced sequestration of uranium. For soil desiccation, a dry gas is injected to desiccate a targeted portion of the subsurface and thereby decrease contaminant movement by removing moisture and decreasing the hydraulic conductivity of the desiccated zone. Ammonia-induced sequestration of uranium relies on changing the pore water chemistry, primarily through pH changes, to induce dissolution and precipitation processes that decrease the amount of mobile uranium in the vadose zone. (authors)

Authors:
; ; ;  [1]; ;  [2]
  1. Pacific Northwest National Laboratory, Richland, Washington (United States)
  2. CH2M Hill Plateau Remediation Company, Richland, Washington (United States)
Publication Date:
Research Org.:
WM Symposia, 1628 E. Southern Avenue, Suite 9-332, Tempe, AZ 85282 (United States)
OSTI Identifier:
22293484
Report Number(s):
INIS-US-14-WM-12186
TRN: US14V1138115008
Resource Type:
Conference
Resource Relation:
Conference: WM2012: Waste Management 2012 conference on improving the future in waste management, Phoenix, AZ (United States), 26 Feb - 1 Mar 2012; Other Information: Country of input: France; 16 refs.
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 54 ENVIRONMENTAL SCIENCES; AMMONIA; CONTAMINATION; DISSOLUTION; GROUND WATER; HYDRAULIC CONDUCTIVITY; PRECIPITATION; REMEDIAL ACTION; SOILS; TECHNETIUM 99; URANIUM

Citation Formats

Truex, M.J., Oostrom, M., Szecsody, J.E., Strickland, C.E., Chronister, G.B., and Benecke, M.W. Technical Basis for Gas-Phase Vadose Zone Remediation Technologies at Hanford: A Review - 12186. United States: N. p., 2012. Web.
Truex, M.J., Oostrom, M., Szecsody, J.E., Strickland, C.E., Chronister, G.B., & Benecke, M.W. Technical Basis for Gas-Phase Vadose Zone Remediation Technologies at Hanford: A Review - 12186. United States.
Truex, M.J., Oostrom, M., Szecsody, J.E., Strickland, C.E., Chronister, G.B., and Benecke, M.W. Sun . "Technical Basis for Gas-Phase Vadose Zone Remediation Technologies at Hanford: A Review - 12186". United States.
@article{osti_22293484,
title = {Technical Basis for Gas-Phase Vadose Zone Remediation Technologies at Hanford: A Review - 12186},
author = {Truex, M.J. and Oostrom, M. and Szecsody, J.E. and Strickland, C.E. and Chronister, G.B. and Benecke, M.W.},
abstractNote = {In situ vadose zone remediation approaches are being evaluated as potential options to mitigate the transport of inorganic and radionuclide contaminants from the vadose zone to the groundwater. Some of the candidate approaches are based on changing the contaminant or subsurface conditions in a way that slows downward migration of the contaminants through the vadose zone using amendments delivered in the gas-phase. Two promising approaches that have undergone testing at Hanford include soil desiccation to address technetium-99 contamination and ammonia-induced sequestration of uranium. For soil desiccation, a dry gas is injected to desiccate a targeted portion of the subsurface and thereby decrease contaminant movement by removing moisture and decreasing the hydraulic conductivity of the desiccated zone. Ammonia-induced sequestration of uranium relies on changing the pore water chemistry, primarily through pH changes, to induce dissolution and precipitation processes that decrease the amount of mobile uranium in the vadose zone. (authors)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {7}
}

Conference:
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