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North America's First UV/Peroxide System to Treat Public Drinking
Water Set to Go On-line in Salt Lake City, Utah - Calgon Carbon's
Corporation's Rayox® Tower System Chosen for Historic Application
PITTSBURGH -- April 8, 1998 -- Calgon Carbon Corporation announced
that the first-ever, full-scale UV/Peroxide system for drinking water
treatment in North America is scheduled for start-up in Salt Lake
City, Utah, this summer. The Salt Lake City Department of Public
Utilities selected Calgon Carbon Corporation's UV/Peroxide system to
treat perchloroethylene (PCE), which was found at low levels in a well
in its public drinking water system. PCE is a suspected carcinogen
commonly found in groundwater supplies and regulated under the 1986
Safe Drinking Water Act.
City officials chose the Calgon Carbon Corporation UV/Peroxide system
technology after conducting an analysis of other technologies
including air stripping and ozone. The system that Salt Lake City will
use is a Calgon Carbon Corporation 360 kW Rayox® Tower using 12x30
kW lamps. The capital cost for the Salt Lake City system is $450,000,
and operating costs are expected to be less than $0.20 per 1,000
gallons of treated water.
According to Florence Reynolds, water quality and treatment
administrator for Salt Lake City, "We considered air stripping but
felt that the technology was problematic because of the need to treat
air emissions. We ultimately selected the Rayox system technology
because it has several unique advantages that the other systems
couldn't offer. One key advantage is that there is no transfer of
contaminants from one medium to another. Residents here are very
pleased about that." Adds Reynolds, "the Rayox system is compact
enough that it fits inside an existing building at the well site. The
system also retains the well's full 3,000 gpm flow capacity because
the UV/Peroxide system is able to effectively treat 100 percent of the
water."
John Mickler, managing director of Calgon Carbon Corporation's
Advanced Oxidation Technologies Business Unit, said "This design
flexibility not only will minimize Salt Lake City's capital
expenditures, but it will allow city officials to maintain the
aesthetics of the historic building that houses the system, as well as
the integrity of the surrounding residential neighborhood." Adds
Mickler, "Both factors were very important to the city. They
contributed significantly to the overall attractiveness of using the
Rayox system."
The Rayox system destroys PCE to below detection levels by injecting
small quantities of hydrogen peroxide into the contaminated water, and
then exposing it to ultraviolet light. In addition, and in contrast to
ozone-based processes, the UV/Peroxide process neither produces
bromate ion in bromide-ion-bearing waters, nor does it produce any
off-gases.
Calgon Carbon Corporation is a world leader in UV technologies for
water treatment. Worldwide, the company has more than 250 UV/Oxidation
systems treating a broad range of contaminated groundwaters,
industrial wastewaters and process waters.
The Pittsburgh-based company is the world leader in activated carbon
technologies, serving approximately 4,000 customers worldwide.
Contact: Gail Gerono, Director of Investor Relations and Corporate
Communications, (412) 787-6795; gerono@calgoncarbon.com
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