Proposed controls on the emission of mercury and other trace elements have raised concerns about the ultimate fate of these contaminants once they are removed from the flue gas. Preventing these “air pollutants” from being transferred to surface or ground waters will be critical. Additionally, ammonia from selective catalytic reduction systems used to control nitrogen oxide emissions can appear in a power plant’s wastewater streams. Research is needed for advanced technologies to detect and remove mercury, arsenic, selenium and other components from the aqueous streams of coal-based power plants.

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