This paper presents results from EPRI projects aimed at enhancing mercury (Hg) co-benefit capture by wet FGD. One project is investigating modified FGD dewatering equipment to produce low-Hg-content gypsum. Recent bench-scale tests have focused on the use of magnetic separation technology to remove iron- and Hg-rich fines from FGD gypsum slurry. A second project involves bench-scale wet FGD tests to determine reactions and kinetics that control Hg re-emissions, which can limit Hg capture by wet FGD. Recent tests have focused on effects of FGD slurry solids on Hg phase partitioning and re-emissions, particularly on effects of trace species introduced by limestone reagent. Available results from these two research and development efforts are presented and discussed in the paper.
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