Simultaneous removal of SO2, NO and Hg0 from flue gas by ferrate (VI) solution

Integrative process of preoxidation and absorption for simultaneous removal of SO2, NO and Hg0

“…In order to be close to the actual industrial environment, the temperature conditions of a typical coal-fired power plant were used as a reference. This consists of flue gas temperatures from the tail of a power boiler of approximately 800-900°C; after passing through the economizer, air preheater and electrostatic precipitation apparatus, the inlet FGD-CFB flue gas temperatures are 140-160°C [14], resulting in an outlet temperature of approximately 70°C. Accordingly, a series of experiments with different reaction temperatures were carried out.…”

“…Therefore, the methods for simultaneous removal of SO 2 , NO and Hg 0 have been extensively researched in recent years. Many reagents such as Fe(II)-EDTA [10], Co(NH 3 ) 6 3+ [11], KMnO 4 [12], CO(NH 2 ) 2 [13], K 2 FeO 4 [14], NaClO 2 [15] and H 2 O 2 [16,17] etc., have been used to simultaneously remove SO 2 , NO and Hg 0 . Nevertheless, most of these cannot be developed for industrial use due to the technical and economic problems.…”

New insights into synergistic effects and active species toward Hg0 emission control by Fe(VI) absorbent

“…Generally speaking, fly ash would need to be removed by electrostatic precipitators (ESP) or fabric filters (FF) prior to the FGD, and N 2 seldom reacts with other matter. Our recent experimental studies [24] show that an amount of SO 2 in flue gas is to the benefit of removing Hg 0 . The promoting action of SO 2 on Hg 0 removal may be attributed to the complex of HgÁS(IV).…”

“…However, the adoption of Fe(VI) absorbent can avoid this undesirable feature, because SO 2 is oxidized by Fe(VI) completely, and the products are dominated by sulfate radicals and rare sulfite species [24]. In addition, sulfate ions could be contributing to the formation of a small amount of mercury sulfate which then precipitates with the gypsum particles or decomposes in HgO(s).…”

The treatment of greywater from a restaurant by electrosynthesized ferrate (VI) ion

“…Therefore, ferrate(VI) is one of the most powerful, multipurpose, environmentally friendly water and wastewater treatment chemicals. Ferrate(VI) has been used effectively for wastewater treatment so far by many researchers [23][24][25]. Due to its unique properties, ferrate(VI) production methods are rather important.…”