Recent studies have shown promising results for subsurface
remediation of dissolved chromate using
permeable-reactive redox walls. Chromate reduction in
the presence of iron filings and quartz grains was studied
to
determine the fate of reduced chromium in proposed wall
material. Using a flow-through column apparatus, iron
filings mixed with quartz grains were reacted with
solutions
that contained about 20 mg/L dissolved Cr(VI).
Reacted
iron filings developed coatings comprised of goethite with
chromium concentrated in the outermost edges. Surface
analysis showed all detectable chromium occurred as
Cr(III) species. In addition, in regions of increased
chromium
concentration, goethite acquired chemical and structural
characteristics similar to Fe2O3 and
Cr2O3. Results of the
study show that complete reduction of Cr(VI) to
Cr(III)
occurred and that Cr(III) was incorporated into
sparingly
soluble solid species.
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