The PCO process for photochemical removal of mercury from flue gas

Removal of Hg0 and simultaneous removal of Hg0/SO2/NO in flue gas using two Fenton-like reagents in a spray reactor

“…For example, with Fe 3+ or Cu 2+ concentration increasing from 0 to 0.02 mol/L, Hg 0 removal efficiency increases from 8.3% to 100% and from 8.3% to 91.3%, respectively. Related results indicate that Hg 0 in flue gas can be oxidized to Hg 2+ by Å OH according to the following reaction (2) [1,[9][10][11][12]23].…”

“…Some results show that elemental mercury can be captured by adsorption of various adsorbents such as carbon-based materials, metal oxides, silica gel, biomass coke/ash, calcium-based materials, and natural mineral materials [2][3][4][5]. In addition, elemental mercury can be also effectively captured by various oxidation techniques [1,[6][7][8][9][10][11][12][13][14][15][16]. The basic principle is that elemental mercury in flue gas is first oxidized to divalent mercury, and then is washed in existing wet flue gas desulfurization devices [1,2,[7][8][9][10][11][12][13][14][15][16].…”

“…In addition, elemental mercury can be also effectively captured by various oxidation techniques [1,[6][7][8][9][10][11][12][13][14][15][16]. The basic principle is that elemental mercury in flue gas is first oxidized to divalent mercury, and then is washed in existing wet flue gas desulfurization devices [1,2,[7][8][9][10][11][12][13][14][15][16]. In accordance with the wetdry state of removal process, these oxidation technologies can be divided into dry and wet two categories [1,2,6].…”

“…In accordance with the wetdry state of removal process, these oxidation technologies can be divided into dry and wet two categories [1,2,6]. Representative dry oxidation technologies mainly include catalytic oxidation, plasma oxidation, photochemical oxidation, photocatalytic oxidation and ozonation [1,2,[6][7][8][9][10][11][12]. Representative nologies mainly include potassium permanganate, sodium chlorite, hydrogen peroxide, persulfate, chlorine dioxide and UV/H 2 O 2 oxidation [1,2,6,[14][15][16].…”

Improving the Removal Efficiency of Elemental Mercury by Pre-Existing Aerosol Particles in Double Dielectric Barrier Discharge Treatments

“…Many technologies have been developed for mercury control (Biswas et al, 1999), such as injecting powdered activated carbon to adsorb mercury (Sjostrom et al, 2010;Clack, 2012), injecting halogen reagents (Zhao et al, 2006) and using UV light and ozone to realize mercury oxidization (Wu et al, 1998;Granite and Pennline 2002;Lee et al, 2004;McLarnon et al, 2005;Wang et al, 2007;Yang et al, 2012). Non-thermal plasma operated at atmospheric pressure is one of the promising technologies for converting gaseous elemental mercury (Hg 0 ) to oxidized mercury (Hg 2+ ) and particulate bound mercury (Hg p ) (Chen et al, 2006;Byun et al, 2011a), which can then be effectively removed by conventional air-pollution control devices (Clack, 2006).…”