A review on removal of elemental mercury from flue gas using advanced oxidation process: Chemistry and process

Liu, Yangxian; Adewuyi, Yusuf G.

doi:10.1016/j.cherd.2016.06.024

Cited by 139 publications

(95 citation statements)

References 283 publications

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“…Fossil fuels combustion processes are considered to be the main anthropogenic mercury emissions source, which account for about 30% of anthropogenic mercury emissions . Mercury from typical coal‐fired flue gas mainly exists in three forms: particulate bounded mercury (Hg p ), elemental mercury (Hg 0 ), and oxidized mercury (Hg 2+ ) . Hg 2+ has a quite high water solubility, and thus it can be removed efficiently using a wet flue gas desulfurization system.…”

Section: Introductionmentioning

confidence: 99%

Gaseous Elemental Mercury Removal Using Combined Metal Ions and Heat Activated Peroxymonosulfate/H₂O₂ Solutions

Liu

Wang

2018

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com)Several novel oxidation removal processes of elemental mercury (Hg 0 ) from flue gas using combined Fe 2+ /Mn 2+ and heat activated peroxymonosulfate (PMS)/H 2 O 2 solutions in a bubbling reactor were proposed. The operating parameters (e.g., PMS/H 2 O 2 concentration, Fe 2+ /Mn 2+ concentration, solution pH, activation temperature, and Hg 0 /NO/SO 2 /O 2 / CO 2 concentration), mechanism and mass transfer-reaction kinetics of Hg 0 removal were investigated. The results show that heat and Fe 2+ /Mn 2+ have significant synergistic effect for activating PMS and PMS/H 2 O 2 to produce free radicals to oxidize Hg 0 . Hg 0 removal is strongly affected by PMS/H 2 O 2 concentration, Fe 2+ /Mn 2+ concentration, activation temperature, and solution pH. SO − 4 · and ·OH produced from combined heat and Fe 2+ /Mn 2+ activated PMS/H 2 O 2 play a leading role in Hg 0 removal. Under optimized experimental conditions, Hg 0 removal efficiencies reach 100, 94.9, 66.9, and 58.9% in heat/Fe 2+ /PMS/H 2 O 2 , heat/Mn 2+ /PMS/H 2 O 2 , heat/Fe 2+ /PMS, and heat/Mn 2+ /PMS systems, respectively. Hg 0 removal processes in four systems belong to fast reaction and were controlled by mass transfer under optimized experimental conditions.

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Section: Introductionmentioning

confidence: 99%

Gaseous Elemental Mercury Removal Using Combined Metal Ions and Heat Activated Peroxymonosulfate/H₂O₂ Solutions

Liu

Wang

2018

AIChE Journal

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“…With the increase of H 2 O 2 concentration in the lime slurry, the removal efficiency of Hg has also increased significantly . However, when the concentration was higher than 2%, the removal efficiency of Hg was limited which was principally maintained at 48%.…”

Section: Resultsmentioning

confidence: 99%

“…With the increase of H 2 O 2 concentration in the lime slurry, the removal efficiency of Hg has also increased significantly. 25 However, when the concentration was higher than 2%, the removal efficiency of Hg was limited which was principally maintained at Desulfurization and demercuration by SDA method www.soci.org 48%. The reaction involved in the oxidation of Hg element in H 2 O 2 is shown in Scheme 2.…”

Section: The Effect Of Additive On Hg Removalmentioning

confidence: 99%

A novel semi‐dry method for the simultaneous removal of Hg and SO₂ using spray drying absorption method

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND A novel semi‐dry method called SDA (spray drying absorption) for the simultaneous removal of mercury (Hg0) and sulfur dioxide (SO2) have been proposed in this article, in which Hg0 was initially oxidized by gaseous oxidant (O3) and liquid oxidant (K2S2O8, H2O2, and NaClO2), after which SO2 and Hg2+ were absorbed by Ca(OH)2. RESULTS The effects on different process conditions and additives on Hg0 removal were explored at first, and the results indicated that the Hg removal efficiency could be improved by oxidizing or extending the residence time of the liquid phase reaction. When SO2 and Hg coexist in the atmosphere, additives including oxidants or composite additives were added into the mixed system, and the results indicated that the best removal efficiency of SO2 and Hg was about 99.5% and 51% respectively. CONCLUSION Since SO2 has good water solubility, it would affect the oxidation of Hg and the removal of Hg. When there was nitric oxide (NO) in the atmosphere, a new stable product was generated which contributed to the removal of Hg, and the removal efficiency of SO2 and Hg was about 99.5% and 57% respectively. © 2020 Society of Chemical Industry

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“…However, related studies also show that OH − also can consume ·OH in solution by the following reaction (13) with a very high reaction rate, thus adding excess OH − (high solution pH) is not conducive to NO removal. Besides, high solution pH or alkaline condition will result in the precipitation of Co 2+ in solution and the fast decomposition of aqueous Oxone , thereby being not conducive to removal of NO.

\cdot OH + {OH}^{-} \to O^{-} \cdot + H_{2} O . k = 1.0 \times 10^{10} M^{- 1} s^{- 1}

…”

Section: Resultsmentioning

confidence: 99%

Removal of nitric oxide from flue gas using sulfate/hydroxyl radicals from activation of oxone with cobalt and high temperature

Liu

Wang

et al. 2017

Env Prog and Sustain Energy

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A simple and efficient method for removing NO from flue gas using sulfate and hydroxyl free radicals from activation of Oxone with cobalt and high temperature has been developed. A comparison of NO removal efficiencies and the yields of sulfate and hydroxyl free radicals in several reaction systems were carried out. Co2+ concentration, Oxone concentration, solution pH, flue gas flow rate, stirring rate, solution temperature, and NO inlet concentration were evaluated as the key factors impacting on NO removal efficiency. The highest removal efficiency of 94.9% for NO was achieved under optimal conditions. The sulfate and hydroxyl radicals as the major reactive species which are responsible for removing NO were determined using ESR spectrometer. The NO is finally oxidized to nitric acid through a series of redox reactions. The chemical reaction mechanism of NO removal has also been proposed. These results prove the feasibility of this new NO removal technology. © 2017 American Institute of Chemical Engineers Environ Prog, 36: 1013–1021, 2017

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A review on removal of elemental mercury from flue gas using advanced oxidation process: Chemistry and process

Cited by 139 publications

References 283 publications

Gaseous Elemental Mercury Removal Using Combined Metal Ions and Heat Activated Peroxymonosulfate/H₂O₂ Solutions

Gaseous Elemental Mercury Removal Using Combined Metal Ions and Heat Activated Peroxymonosulfate/H₂O₂ Solutions

A novel semi‐dry method for the simultaneous removal of Hg and SO₂ using spray drying absorption method

Removal of nitric oxide from flue gas using sulfate/hydroxyl radicals from activation of oxone with cobalt and high temperature

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A review on removal of elemental mercury from flue gas using advanced oxidation process: Chemistry and process

Cited by 139 publications

References 283 publications

Gaseous Elemental Mercury Removal Using Combined Metal Ions and Heat Activated Peroxymonosulfate/H2O2 Solutions

Gaseous Elemental Mercury Removal Using Combined Metal Ions and Heat Activated Peroxymonosulfate/H2O2 Solutions

A novel semi‐dry method for the simultaneous removal of Hg and SO2 using spray drying absorption method

Removal of nitric oxide from flue gas using sulfate/hydroxyl radicals from activation of oxone with cobalt and high temperature

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Gaseous Elemental Mercury Removal Using Combined Metal Ions and Heat Activated Peroxymonosulfate/H₂O₂ Solutions

Gaseous Elemental Mercury Removal Using Combined Metal Ions and Heat Activated Peroxymonosulfate/H₂O₂ Solutions

A novel semi‐dry method for the simultaneous removal of Hg and SO₂ using spray drying absorption method