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In situ formation of phosphate barriers in soil

Patent ·
OSTI ID:874564
 [1]
  1. Edgewood, NM
+ Show Author Affiliations

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.

Research Organization:
SANDIA CORP
DOE Contract Number:
AC04-94AL85000
Assignee:
Sandia Corporation (Albuquerque, NM)
Patent Number(s):
US 6416252
OSTI ID:
874564
Country of Publication:
United States
Language:
English

References (9)

Formation of hydroxyapatite at low supersaturation journal January 1976
Kinetics of Hydroxyapatite Formation at Low Temperature journal May 1991
Immobilization of Actinides by Hydroxylapatite journal January 1991
Sorption of uranium and other heavy metals on hydroxyapatite journal December 1995
Precipitation of calcium phosphate at 40° C from neutral solution journal December 1991
Immobilization of Uranium in Contaminated Sediments by Hydroxyapatite Addition journal December 1998
Soil Heating for Enhanced Remediation of Chlorinated Solvents:  A Laboratory Study on Resistive Heating and Vapor Extraction in a Silty, Low-Permeable Soil Contaminated with Trichloroethylene journal May 1998
Preparation of hydroxyapatite by the hydrolysis of brushite journal December 1987
In situ soil flushing using prefabricated vertical drains journal March 1996

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Related Subjects

/405/588/
achieve
actinides
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apatite
aqueous
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barriers
calcium
capillary
capillary action
chloride
complete
contamination
controlled
dilute
disclosed
drum
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enhanced
example
facilitates
form
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groundwater
heavy
including
injecting
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mediated
metals
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mixing
movement
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ph
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phosphate
plume
precipitate
pressure
proximity
rapid
reactive
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result
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sequestering
situ
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sodium
soil
source
specifically
techniques
temperature
washing
waste