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In situ formation of magnetite reactive barriers in soil for waste stabilization

Patent ·
OSTI ID:875082
 [1]
  1. Edgewood, NM
+ Show Author Affiliations

Reactive barriers containing magnetite and methods for making magnetite reactive barriers in situ in soil for sequestering soil contaminants including actinides and heavy metals, organic materials, iodine and technetium are disclosed. According to one embodiment, a two-step reagent introduction into soil takes place. In the first step, free oxygen is removed from the soil by separately injecting into the soil aqueous solutions of iron (II) salt, for example FeCl.sub.2, and base, for example NaOH or NH.sub.3 in about a 1:1 volume ratio. Then, in the second step, similar reagents are injected a second time (however, according to about a 1:2 volume ratio, iron to salt) to form magnetite. The magnetite formation is facilitated, in part, due to slow intrusion of oxygen into the soil from the surface. The invention techniques are suited to injection of reagents into soil in proximity to a contamination plume or source allowing in situ formation of the reactive barrier at the location of waste or hazardous material. 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 6527691
OSTI ID:
875082
Country of Publication:
United States
Language:
English

References (7)

Sorption and Reduction of Uranium(VI) on Iron Corrosion Products under Reducing Saline Conditions journal January 1996
Ferrite treatment of actinide waste solutions: chemical interferences in actinide removal by ferrite treatment report January 1985
Understanding the Mechanism of Uranium Removal from Groundwater by Zero-Valent Iron Using X-ray Photoelectron Spectroscopy journal May 1998
Electrosorption and Reduction of Pertechnetate by Anodically Polarized Magnetite journal April 1999
Reduction of Pertechnetate by Ferrous Iron in Solution: Influence of Sorbed and Precipitated Fe(II) journal January 1996
Influence of Fe(II) on the Formation of the Spinel Iron Oxide in Alkaline Medium journal January 1992
Reduction of Pertechnetate in Solution by Heterogeneous Electron Transfer from Fe(II)-Containing Geological Material journal January 1996

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Related Subjects

/588/
11
12
actinides
action
allowing
aqueous
aqueous solution
barrier
barriers
base
capillary
capillary action
containing
contaminants
contamination
disclosed
due
embodiment
enhanced
example
facilitated
feclsub2
form
formation
free
groundwater
hazardous
heavy
ii
including
injected
injecting
injection
introduction
intrusion
iodine
iron
location
magnetite
material
materials
mediated
metals
methods
mixing
movement
naoh
nhsub3
organic
oxygen
phenomena
plume
precipitate
pressure
proximity
ratio
reactive
reagent
reagents
removed
result
salt
separately
sequestering
similar
situ
situ formation
slow
soil
solutions
source
stabilization
step
suited
surface
takes
technetium
techniques
time
two-step
volume
washing
waste