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Title: In situ formation of phosphate barriers in soil

Abstract

Reactive barriers and methods for making reactive barriers in situ in soil for sequestering soil ontaminants including actinides and heavy metals. The barrier includes phosphate, and techniques are disclosed for forming specifically apatite barriers. The method includes injecting dilute reagents into soil in proximity to a contamination plume or source such as a waste drum to achieve complete or partial encapsulation of the waste. Controlled temperature and pH facilitates rapid formation of apatite, for example, where dilute aqueous calcium chloride and dilute aqueous sodium phosphate are the selected reagents. Mixing of reagents to form precipitate is mediated and enhanced through movement of reagents in soil as a result of phenomena including capillary action, movement of groundwater, soil washing and reagent injection pressure.

Inventors:
 [1]
  1. Edgewood, NM
Issue Date:
Research Org.:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
OSTI Identifier:
874564
Patent Number(s):
6416252
Assignee:
Sandia Corporation (Albuquerque, NM)
Patent Classifications (CPCs):
B - PERFORMING OPERATIONS B09 - DISPOSAL OF SOLID WASTE B09C - RECLAMATION OF CONTAMINATED SOIL
B - PERFORMING OPERATIONS B09 - DISPOSAL OF SOLID WASTE B09B - DISPOSAL OF SOLID WASTE
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
situ; formation; phosphate; barriers; soil; reactive; methods; sequestering; ontaminants; including; actinides; heavy; metals; barrier; techniques; disclosed; forming; specifically; apatite; method; injecting; dilute; reagents; proximity; contamination; plume; source; waste; drum; achieve; complete; partial; encapsulation; controlled; temperature; ph; facilitates; rapid; example; aqueous; calcium; chloride; sodium; selected; mixing; form; precipitate; mediated; enhanced; movement; result; phenomena; capillary; action; groundwater; washing; reagent; injection; pressure; capillary action; situ formation; /405/588/

Citation Formats

Moore, Robert C. In situ formation of phosphate barriers in soil. United States: N. p., 2002. Web.
Moore, Robert C. In situ formation of phosphate barriers in soil. United States.
Moore, Robert C. Tue . "In situ formation of phosphate barriers in soil". United States. https://www.osti.gov/servlets/purl/874564.
@article{osti_874564,
title = {In situ formation of phosphate barriers in soil},
author = {Moore, Robert C},
abstractNote = {Reactive barriers and methods for making reactive barriers in situ in soil for sequestering soil ontaminants including actinides and heavy metals. The barrier includes phosphate, and techniques are disclosed for forming specifically apatite barriers. The method includes injecting dilute reagents into soil in proximity to a contamination plume or source such as a waste drum to achieve complete or partial encapsulation of the waste. Controlled temperature and pH facilitates rapid formation of apatite, for example, where dilute aqueous calcium chloride and dilute aqueous sodium phosphate are the selected reagents. Mixing of reagents to form precipitate is mediated and enhanced through movement of reagents in soil as a result of phenomena including capillary action, movement of groundwater, soil washing and reagent injection pressure.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {1}
}

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Works referenced in this record:

Sorption of uranium and other heavy metals on hydroxyapatite
journal, December 1995


In situ soil flushing using prefabricated vertical drains
journal, March 1996


Preparation of hydroxyapatite by the hydrolysis of brushite
journal, December 1987


Kinetics of Hydroxyapatite Formation at Low Temperature
journal, May 1991


Immobilization of Actinides by Hydroxylapatite
journal, January 1991


Formation of hydroxyapatite at low supersaturation
journal, January 1976


Precipitation of calcium phosphate at 40° C from neutral solution
journal, December 1991