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Title: Uranium Immobilization via Phosphate Injection into the Subsurface at the Hanford 300 Area

Abstract

No abstract prepared.

Authors:
; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
927305
Report Number(s):
CONF/ERSP2007-1029579
R&D Project: ERSD 1029579; TRN: US0803154
Resource Type:
Conference
Resource Relation:
Conference: Annual Environmental Remediation Science Program (ERSP) Principal Investigator Meeting, April 16-19, 2007, Lansdowne, VA
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 54 ENVIRONMENTAL SCIENCES; HANFORD RESERVATION; REMEDIAL ACTION; PHOSPHATES; SORPTIVE PROPERTIES; URANIUM; SORPTION

Citation Formats

Dawn Wellman, Vince Vermeul, and John Fruchter. Uranium Immobilization via Phosphate Injection into the Subsurface at the Hanford 300 Area. United States: N. p., 2007. Web.
Dawn Wellman, Vince Vermeul, & John Fruchter. Uranium Immobilization via Phosphate Injection into the Subsurface at the Hanford 300 Area. United States.
Dawn Wellman, Vince Vermeul, and John Fruchter. Thu . "Uranium Immobilization via Phosphate Injection into the Subsurface at the Hanford 300 Area". United States. doi:. https://www.osti.gov/servlets/purl/927305.
@article{osti_927305,
title = {Uranium Immobilization via Phosphate Injection into the Subsurface at the Hanford 300 Area},
author = {Dawn Wellman and Vince Vermeul and John Fruchter},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Apr 19 00:00:00 EDT 2007},
month = {Thu Apr 19 00:00:00 EDT 2007}
}

Conference:
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  • This paper describes the pilot-scale treatability test that was conducted to evaluate the efficacy of using a polyphosphate injection approach to treat uranium-contaminated groundwater in situ within the 300 Area aquifer at the Hanford Site in Richland, Washington. Primary test objectives were to assess 1) direct treatment of available uranium contributing to the groundwater plume through precipitation of the uranyl phosphate mineral autunite, and 2) emplacement of secondary-treatment capacity via precipitation of the calcium phosphate mineral apatite, which acts as a long-term sorbent for uranium.
  • This paper describes the pilot-scale treatability test that was conducted to evaluate the efficacy of using a polyphosphate injection approach to treat uranium-contaminated groundwater in situ within the 300 Area aquifer at the Hanford Site in Richland, Washington. Primary test objectives were to assess 1) direct treatment of available uranium contributing to the groundwater plume through precipitation of the uranyl-phosphate mineral autunite, and 2) emplacement of secondary-treatment capacity via precipitation of the calcium-phosphate mineral apatite, which acts as a long-term sorbent for uranium. Based on an injection design analysis that incorporated results from both bench-scale testing and site-specific characterization activities,more » a three-phase injection approach was selected for field-scale testing. This approach consisted of 1) an initial polyphosphate injection to facilitate direct treatment of aqueous uranium in the pore space, 2) a second phase consisting of a calcium chloride injection to provide an available calcium source for the creation of apatite, and 3) a subsequent polyphosphate injection to supply a phosphate source for the formation of apatite. The total-solution volume injected during this field test was approximately 3.8 million L (1 million gal). Results from this investigation will be used to identify implementation challenges and investigate the technology's ability to meet remedial objectives. In addition, data from this test will provide valuable information for designing a full-scale remedial action for uranium in groundwater beneath the 300 Area of the Hanford Site, and a detailed understanding of the fundamental underpinnings necessary to evaluate the efficacy and potential for utilization of the polyphosphate technology at other sites with varying geochemical and hydrodynamic conditions. (authors)« less
  • No abstract prepared.
  • This report provides a description of uranium contamination in the subsurface at the Hanford Site's 300 Area. The principal focus is a persistence plume in groundwater, which has not attenuated as predicted by earlier remedial investigations. Included in the report are chapters on current conditions, hydrogeologic framework, groundwater flow modeling, and geochemical considerations. The report is intended to describe what is known or inferred about the uranium contamination for the purpose of making remedial action decisions.