Chemfix Technologies, Inc.
Solidification/Stabilization Process
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Chemfix Technologies Inc. Solidification/Stabilization
Process (911K)
U.S. EPA Superfund Innovative Technology Evaluation (SITE) Program
Solidification and Stabilization (S/S)
Advanced Remediation Mixing, Inc.
ABSTRACT
In this S/S process, reactions between
pozzolanic materials and polyvalent metal ions and other waste components produce a
chemically and physically stable solid material. Soils, sludges, and ashes that contain
heavy metals are blended in a reactor with pozzolanic materials that contain calcium
hydroxide. The blend is then dispersed throughout an aqueous phase where cationic and
anionic metal complexes are formed. When water soluble silicate reacts with the waste and
the pozzolanic binding system, colloidal silicate gel structures are formed, trapping
heavy metals either by adsorption or within the colloidal structure. The cured pozzolanic
matrix decreases toxic metal mobility by limiting access to leaching liquids. This process
can also be used to stabilize low level nuclear wastes, when combined with specialized
binders. This process was demonstrated in March 1989 at the Portable Equipment Salvage
Company site in Clackamas, Oregon. Lead and copper levels were reduced by 94-99%. The
treated wastes showed no weight loss after 12 cycles of wetting and drying or freezing and
thawing. No significant volatilization of PCB’s was observed.
Back to SITE Home Page
Posted June 22, 1999
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