Deployment of an innovative thermally enhanced soil mixing process augmented with zero-valent iron. Page: 4 of 35
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DEPLOYMENT OF AN INNOVATIVE THERMALLY
ENHANCED SOIL MIXING PROCESS
AUGMENTED WITH ZERO-VALENT IRON
Peter Lynch, Argonne National Laboratory-East
An innovative in-situ soil treatment process, referred to as soil mixing/thermally enhanced
soil vapor extraction (SM/TESVE), was used to remediate the 317 Area of Argonne National
Laboratory-East (i.e., Argonne), which is contaminated with volatile organic compounds (VOCs).
Following the initial soil treatment, polishing was required to reduce residual concentrations of
A study of polishing methods was conducted. It determined that injecting metallic iron
particles into the soil, in conjunction with soil mixing, would reduce residual VOC concentrations
more effectively than the original conventional soil ventilation approach. After the effectiveness of
iron injection was verified, it replaced the soil ventilation step.
The modified process involved mixing the soil while hot air and steam were injected into
it. Off-gases were captured in a hood over the treatment area. During this process, an iron slurry,
consisting of up to 50% iron particles in water with guar gum added as a thickening agent, was
injected and mixed into the soil by the mixing equipment. Approximately 6,246 m3 (8,170 yd3) of
soil was treated during this project. Confirmatory samples were then collected. In these samples,
VOC concentrations were usually reduced by more than 80%.
2 TREATMENT AREA
The 317 Area is an active hazardous and radioactive waste processing and storage area. It
is located on the extreme southern end of the Argonne site. From the mid-1950s to the early 1960s,
liquid waste was placed in a unit in the 317 Area known as the French Drain. Since that time, this
waste has migrated into underlying soil and groundwater. Figure 1 shows the current arrangement
of waste management facilities in the 317 Area. Photo A shows the treatment area before in-situ soil
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Lynch, P. L. Deployment of an innovative thermally enhanced soil mixing process augmented with zero-valent iron., article, January 15, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc622833/m1/4/: accessed February 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.