Demonstration of additive use for enhanced mercury emissions control in wet FGD systems

Removal and recovery of gas-phase element mercury by metal oxide-loaded activated carbon

“…Of all trace metals emitted during fossil fuel combustion and waste incineration, Hg was considered as the most problematic pollutant based on many documented adverse health effects associated with Hg exposure and the inability of current pollution control technologies and strategies, designed primarily for particulated matter (PM), NO x , and SO 2 , to effectively control volatile Hg species, especially Hg 0 [1][2][3][4][5][6][7][8].…”

Effects of Sulfur Dioxide and Nitric Oxide on Mercury Oxidation and Reduction under Homogeneous Conditions

“…However, none of the wet scrubbers can effectively capture and remove elemental mercury (Hg 0 ). [1][2][3][4][5] Therefore, if the Hg control target is to be met by taking advantage of cobenefit reduction with scrubbers currently used for SO 2 removal, effective methods to transform Hg 0 to watersoluble divalent mercury (Hg 2ϩ ) must be developed. In recent years, research efforts have been and continue to shed light on various aspects of Hg oxidation, especially with chlorine-containing species, under conditions relevant to those encountered in coal-fired utility boilers.…”

“…Hg leaves the high-temperature combustion zone as elemental Hg, part of which transforms into oxidized form during the postcombustion zone as flue gas cools. 5,12 One-step global reaction mechanisms have been proposed to model this observed depletion of Hg 0 in the presence of chlorine (Cl 2 ) and hydrogen chloride (HCl). 16 Although such mechanisms can give plausible qualitative results, the global mechanisms, nevertheless, provide little insight into the details of the conversion process and, hence, are not instrumental for the examination of other flue gas effects, such as SO 2 and NO x .…”

Study of mercury re-emission in a simulated WFGD solution containing thiocyanate and sulfide ions

“…Thus, numerous efforts [5][6][7][8][9][10] have been conducted to oxidize the elemental mercury (Hg 0 ) to oxidized mercury (Hg 2+ ) for the purpose of enhancing the mercury capture efficiency. However, the re-emission of Hg 0 owing to the reduction of Hg 2+ was often reported [11][12][13], which significantly lowered the total mercury removal efficiency in WFGD system.…”