A certain fraction of mercury is bound to particulate
matter (Hgp), due to sorption on the surface of ash particles or
injected dry sorbents. While gaseous Hg0 is considered not to be
affected by conventional flue gas cleaning systems, Hgp is removed
by particle filters [7]. Due to the high solubility of HgCl2 and HgBr2
in water, wet scrubbers offer the possible side benefit of removing
HgCl2 and HgBr2 from the flue gas efficiently. Results of numerous
investigations from lab- to full-scale demonstrate that the wet flue
gas desulfurization (FGD) process is able to remove water soluble
Hg compounds from flue gas at high efficiency [8,9].