Simultaneous absorption of SO2 and NO from flue gas using ultrasound/Fe2+/heat coactivated persulfate system

Liu, Yangxian; Liu, Ziyang; Wang, Yan; Yin, Yanshan; Pan, Jianfeng; Zhang, Jun; Wang, Qian

doi:10.1016/j.jhazmat.2017.08.042

Cited by 189 publications

(105 citation statements)

References 37 publications

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“…However, when H 2 O 2 concentration exceeds 0.1 mol/L, Hg 0 removal efficiency and Hg 0 absorption rate only slightly raise with the further increase of H 2 O 2 concentration. Related results have showed that high concentrations of H 2 O 2 also can greatly consume ·OH in the solutions by the following reaction (17) because there is a very high reaction rate between H 2 O 2 and ·OH (it is up to

2.7 \times 10^{7} {normalM}^{- 1} {normals}^{- 1}

{normalH}_{2} {normalO}_{2} + \cdot OH \to {HO}_{2} \cdot + {normalH}_{2} O

…”

Section: Resultsmentioning

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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2.7 \times 10^{7} {normalM}^{- 1} {normals}^{- 1}

{normalH}_{2} {normalO}_{2} + \cdot OH \to {HO}_{2} \cdot + {normalH}_{2} O

…”

Section: Resultsmentioning

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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“…•− reacts with hydroxide ions or water molecules to produce a sulfate ion and hydroxyl radicals (OH • ) (Equations (18) and (19)…”

Section: Effect Of Na2s2o8 Concentrationmentioning

confidence: 99%

“…This is because more free reactive radicals were generated (especially OH • ) through the inhibition of the decomposition of S2O8 2− and ClO2 − under alkaline conditions. In particular, alkaline conditions could promote the conversion of SO • to OH • by Equation (19). OH • is more reactive than SO • [23].…”

Section: Effect Of Initial Phmentioning

confidence: 99%

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Simultaneous Removal of NOx and SO2 through a Simple Process Using a Composite Absorbent

et al. 2018

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In this work, the feasibility of the simultaneous removal of NOx and SO2 through a simple process using a composite absorbent (NaClO2/Na2S2O8) was evaluated. Factors affecting the removal of NOx and SO2, such as NaClO2 and Na2S2O8 concentrations, solution temperature, the initial pH of solution, gas flow rate, and SO2, NO, and O2 concentrations were studied, with a special attention to NOx removal. Results indicate that a synergistic effect on NOx removal has been obtained through combination of NaClO2 and Na2S2O8. NaClO2 in the solution played a more important role than did Na2S2O8 for the removal of NOx. The above factors had an important impact on the removal of NOx, especially the solution temperature, the initial pH of the solution, and the oxidant concentrations. The optimum experimental conditions were established, and a highest efficiency of NOx removal of more than 80% was obtained. Meanwhile, tandem double column absorption experiments were conducted, and a NOx removal efficiency of more than 90% was reached, using NaOH solution as an absorbant in the second reactor. A preliminary reaction mechanism for NOx and SO2 removal was deduced, based on experimental results. The composite absorbent has the potential to be used in the wet desulfurization and denitration process, to realize the synergistic removal of multi-pollutants.

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“…Although advanced oxidation processes (AOPs) such as UV/H 2 O 2 are widely applied in wastewater treatment [22,23], but recent findings show that such processes are also could be suitable alternative to conventional methods in gas purification field. UV light/H 2 O 2 [24,25], persulfate/heat/light/ultrasound [14,26] and UV/Fenton-like reactions [10] are some examples of the most studied AOPs for gas purification, especially simultaneous removal of NO and SO 2 . The application of UV or Vacuum Ultraviolet (VUV) combined with other chemical compounds such as Peroxymonosulfate (PMS) and KHSO 5 has been also studied by some researchers [27,28].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of electrical energy consumption in UV/H2O2 advanced oxidation process for simultaneous removal of NO and SO2

Shahrestani¹,

Rahimi²

2018

Environmental Engineering Research

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The electrical energy consumption (EEC) in removal of NO by a UV/H2O2 oxidation process was introduced and related to removal efficiency of this gas. The absorption-reaction of NO was conducted in a bubble column reactor in the presence of SO2. The variation in NO removal efficiency was investigated for various process parameters including NO and SO2 inlet concentrations, initial concentration of H2O2 solution and gas flow rate. EEC values were obtained in these different conditions. The removal efficiency was increased from about 22% to 54.7% when H2O2 concentration increased from 0.1 to 1.5 M, while EEC decreased by about 70%. However, further increase in H2O2 concentration, from 1.5 to 2, had no significant effect on NO absorption and EEC. An increase in NO inlet concentration, from 200 to 500 ppm, decreased its removal efficiency by about 10%. However, EEC increased from 2.9 × 10 -2 to 3.9 × 10 -2 kWh/m 3 . Results also revealed that the presence of SO2 had negative effect on NO removal percentage and EEC values. Some experiments were conducted to investigate the effect of H2O2 solution pH. The changing of pH of oxidation-absorption medium in the ranges between 3 to 10, had positive and negative effects on removal efficiency depending on pH value.

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Simultaneous absorption of SO2 and NO from flue gas using ultrasound/Fe2+/heat coactivated persulfate system

Cited by 189 publications

References 37 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

Simultaneous Removal of NOx and SO2 through a Simple Process Using a Composite Absorbent

Evaluation of electrical energy consumption in UV/H2O2 advanced oxidation process for simultaneous removal of NO and SO2

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Simultaneous absorption of SO2 and NO from flue gas using ultrasound/Fe2+/heat coactivated persulfate system

Cited by 189 publications

References 37 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

Simultaneous Removal of NOx and SO2 through a Simple Process Using a Composite Absorbent

Evaluation of electrical energy consumption in UV/H2O2 advanced oxidation process for simultaneous removal of NO and SO2

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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