Improving Capture of Mercury Efficiency of WFDGs by Reducing Mercury Reemissions

Abstract: “The U.S. Environmental Protection Agency (EPA) and World Health Organization (WHO) along with several published reports have identified mercury as a hazardous air pollutant leading to the EPA establishing Mercury and Air Toxics Standards (MATS) for coal-fired electricity generating units (EGUs) that take effect in 2015. Currently over 50% of the existing coal-fired EGUs based on capacity utilize wet flue gas desulfurization systems (WFGDs) to reduce sulfur dioxide emissions. WFGDs represent existing air quality control devices (AQCDs) that as part of a mercury emissions control strategy, can facilitate EGU mercury compliance.

This white paper focuses on EGUs that contain WFGDs and their utilization as part of a MATS mercury compliance strategy. In particular, our focus is limited to wet-scrubbed units with highly oxidized mercury flue gas entering the WFGD that are not attaining or are only marginally attaining mercury emission limitations.”

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