Mercury emissions tested at Brayton Point

BOSTON, July 19, 2002 — ADA Environmental Solutions (ADA-ES) and PG&E National Energy Group (PG&E NEG) have begun a field test for controlling mercury emissions at the Brayton Point Station in Somerset, Mass.

The U.S. Department of Energy (DOE) proposed this joint government-business funded project to offer coal power plant operators better ways to reduce these emissions at much lower costs. The goal is to develop a cost-effective technology that will allow the industry to reduce annual mercury emissions from power plants by 50 to 70 percent of current levels.

PG&E NEG volunteered and was selected by the DOE’s National Energy Technology Laboratory to participate in the initial phase of the Department’s advanced mercury control technology field-testing program.

This is part of a larger DOE effort to develop and test low-cost mercury controls for the Nation’s fleet of coal-fired electric utility boilers.

Brayton Point Station was selected as a test site because its low-sulfur, eastern bituminous coal, and existing particulate matter control devices are representative of a large number of plants across the country. These test results will provide needed information on the potential use of this mercury-specific technology at other power plants.

The technology consists of injecting mercury-adsorbing sorbents into the flue gas upstream of the particulate matter control device called an electrostatic precipitator (ESP). The gas phase mercury contacts the sorbent, attaches to its surface and is collected in the precipitator.

During 2001, ADA-ES conducted two other field tests at power plants operated by Alabama Power, a subsidiary of Southern Company, and Wisconsin Energy Corporation. Each plant represents a different mixture of coal types, plant equipment, and operating conditions. The DOE is funding two-thirds of the overall $6.8 million test program.

“The willingness of power companies to provide host sites for these full-scale field tests has been critical to the success of this program,” reports Dr. Michael Durham, President of ADA-ES. “It allows us to operate the equipment under realistic operating conditions and gain from the expertise and experience of plant personnel.”

“This project is one in a series of high-tech field tests that illustrate how government and industry can work together to develop innovative ways to meet President Bush’s Clear Skies initiative,” said Carl Michael Smith, the Energy Department’s Assistant Secretary for Fossil Energy.

“If this and similar test programs achieve their objectives, Americans will benefit from cleaner, healthier air and potentially billions of dollars in cost savings on their utility bills.”

“We, too, are pleased to see power companies step forward to host these important field tests,” Smith added.

PG&E NEG also volunteered for its Salem, Mass. coal plant to participate in the test this fall. In 2000, company plants in Massachusetts, Pennsylvania and New Jersey were chosen to participate in EPA’s Mercury Information Collection Request program, a national, full scale test program designed to gather detailed information on mercury emissions from coal-fired power plants.

In 1994, PG&E NEG was the first in the country to use Selective Catalytic Reduction in its new commercial coal-fired power plant, resulting in a 60 percent reduction in nitrogen oxide emissions from the average coal plant. This is now a standard for all new coal plants, and it is the most widely recognized technology used to meet new regulatory requirements for nitrogen oxide reductions.

Headquartered in Bethesda, Md., PG&E National Energy Group develops, builds, owns and operates electric generating and natural gas pipeline facilities and provides energy trading, marketing and risk-management services.

ADA Environmental Solutions, LLC (ADA-ES) is an environmental technology and specialty chemical company headquartered in Littleton, Colorado. The company brings 25 years of experience to improve profitability for electric power and industrial companies through proprietary products and systems that mitigate environmental impact while reducing operating costs.

ADA-ES is a subsidiary of Earth Sciences, whose common stock trades on the OTC Bulletin Board under the symbol ESCI.

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