Abstract
Emissions of mercury to the environment, in particular air emissions, are of increasing concern in the United States. The U.S. EPA has surveyed sources of mercury emissions, and coal-fired power plants were found to discharge the largest amount of mercury into the atmosphere as compared to other man-made sources. In December 2000, the U.S. EPA made a determination to regulate mercury emissions from coal-fired electric utility boilers. Compliance with the as-yet-to-be-determined regulations may necessitate additional air-pollution control devices being installed at utility power plants.There is a considerable amount of data in the literature showing that high levels of mercury removal can occur in existing control devices. Particulate control devices such as electrostatic precipitators and fabric filters are capable of removing mercury, but the level of removal is highly variable, depending on coal type, boiler configuration, mercury speciation in flue gas, and operating conditions in the control device. T...
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