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Calgon Carbon's ISEP® Demonstrates Perchlorate Removal
PITTSBURGH, PA -- December 7, 1998 -- Calgon Carbon Corporation
announced today that it has successfully completed field trials for
the removal of perchlorate from groundwater in California's San
Gabriel Valley utilizing an ISEP® continuous ion exchange system
which was designed and manufactured by Advanced Separation
Technologies, a subsidiary of Calgon Carbon. Perchlorate is often
present in groundwater where rocket fuels, fireworks, and explosives
have been manufactured.
The month-long trial, which was supported by the Main San Gabriel
Basin Watermaster and conducted at the Big Dalton well site,
demonstrated ISEP's capability to exceed requirements by reducing
perchlorate concentration in the groundwater on a continuous, ongoing
basis to below California's Provisional Action Level of 18 parts per
billion (ppb).
A summary of the results was presented to the Watermaster. The data
show that the ISEP system exceeded requirements, consistently reducing
perchlorate concentration in the groundwater to below the detection
level limit of 4 ppb. The results also demonstrate that the ISEP
reduced the concentration of nitrate in the groundwater by about
60%.
These results confirm the capability of the ISEP to reliably,
consistently, and economically remove small amounts of perchlorate in
contaminated water and to concurrently reduce the concentrations of
other ionic contaminants such as nitrate and sulfate to insignificant
levels.
Calgon Carbon Corporation is a leader in the production, supply and
design of products, services, and technologies for the purification,
separation, and concentration of liquids and gases. Advanced
Separation Technologies Incorporated, based in Lakeland, Florida, is a
leading worldwide supplier of the patented ISEP Continuous Contactor
for ion exchange, chromatography, and adsorption.
Contact: Gail Gerono, Director of Investor Relations and Corporate
Communications, (412) 787-6795; gerono@calgoncarbon.com
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