Case Studies: Full-Scale Operations and Delivery Systems - Stabilization and Solidification of Hazardous, Radioactive, and Mixed Wastes - page 342

Millgard Environmental Corp. MecTool
Computerized
monitoring to control
and document
treatment

System can deliver
multiple treatments

MecTool can treat
a soil column up to
18 feet in diameter

Probes can be located in
the tool to monitor and
deliver treatments

Tool delivers up to
300,000 ft/lb of torque
to mix ft-lb blend

FIGURE 13.4 Schematic of in situ mixing with an auger system.

FIGURE 13.5 Photograph of actual in situ mixing with an auger system.

advantage is the ability to control both volatile and particulate emissions from the
site, due to the use of a hood or shroud over the drilling assembly and the column
being stabilized. Another advantage is that the production of discrete, accurately
placed columns of treated waste provides assurance that all of the waste is treated,
although the required overlap of the columns means that some of the volume is
double treated. Although double treatment usually causes no harm, over-treatment
is not permissible for some systems.
One limitation of the drilling/augering method is problems with underground
obstacles such as boulders and buried debris. The larger auger systems can usually
deal with smaller obstacles, but large ones can prevent complete treatment of the