Control of Mercury Emissions from Coal-Fired Electric Utility Boilers

Srivastava, Ravi K.; Hutson, Nick D.; Martin, Blair; Princiotta, F.T.; Staudt, James E.

doi:10.1021/es062639u

Cited by 264 publications

(173 citation statements)

References 8 publications

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“…Another means of capture mercury involves the oxidation of Hg 0 by chlorine and bromine species present in the flue gases [19][20], as well as the use of FGD oxidation additives, such us potassium permanganate and Fenton reagents. The oxidation rates of potassium permanganate are very high [21].…”

Section: Introductionmentioning

confidence: 99%

Control of Hg0 re-emission from gypsum slurries by means of additives in typical wet scrubber conditions

Ochoa-González

Dı́az-Somoano

Martı́nez-Tarazona

2013

Fuel

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The effect of different additives on the re-emission of Hg 0 in wet limestone-based flue gas desulphurisation (WFGD) conditions is assessed. Because re-emission of elemental mercury from natural limestone is dependent on the pH of the gypsum slurry, re-emission of elemental mercury was evaluated for different additives using gypsum slurry with a constant pH value of 7. The additives investigated included oxidizing and reducing agents (Fenton reagents and sodium thiosulphate) and also chelating agents (2,4,6 trimercaptotriazine trisodium and sodium hydrosulfide). Fenton reagents were added to prevent the reduction of oxidized mercury species as H 2 O 2 was the precursor used to convert sulfite ions into sulphate or to oxidize Hg 0 . Thiosulphate were added so that mercury could be retained in the gypsum at low concentrations as insoluble HgS, while mercury is being stabilized in the liquid fraction at higher additive doses. The addition of 2,4,6 trimercaptotriazine trisodium (TMT) and NaHS in low doses prevented the reduction of oxidized mercury species as insoluble HgS and Hg 3 (TMT) precipitate onto the gypsum slurry. TMT was found to be most effective additive for Hg 2+ capture.

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Section: Introductionmentioning

confidence: 99%

Control of Hg0 re-emission from gypsum slurries by means of additives in typical wet scrubber conditions

Ochoa-González

Dı́az-Somoano

Martı́nez-Tarazona

2013

Fuel

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“…Atmospheric Hg is a global problem with many natural and anthropogenic emission sources [2]. Coal-fired power plants are cited as one of the largest sources of Hg emissions to the environment [3].…”

Section: Introductionmentioning

confidence: 99%

Speciation of mercury in fly ashes by temperature programmed decomposition

López-Antón

Perry

Abad-Valle

et al. 2011

Fuel Processing Technology

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Mercury (Hg) is a toxic trace element which is emitted mostly in gas phase during coal combustion, although some Hg compounds may be retained in the fly ashes depending on the characteristics of the ashes and process conditions. To improve the retention of Hg in the fly ashes a good knowledge of the capture mechanism and Hg species present in the fly ashes is essential. The temperature programmed decomposition technique was chosen

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“…Ease of removal with air pollution control devices and from the atmosphere via deposition depends on the form of the mercury emissions. Hg 2+ is water soluble and relatively easily removed from flue gases by scrubbing via flue gas desulfurization (FGD) units and from the atmosphere via precipitation; Hg p is captured in particulate control devices; but Hg 0 is not readily removed from flue gases or the atmosphere (9). Combustion of bituminous coals generally produces a higher fraction of Hg 2+ emissions than lignite and sub-bituminous coals, because higher chlorine content in bituminous coal assists in conversion of Hg 0 to Hg 2+ (9).…”

Section: Mercury Emissions From Us Coal-fired Power Plantsmentioning

confidence: 99%

After the Clean Air Mercury Rule: Prospects for Reducing Mercury Emissions from Coal-Fired Power Plants

Milford

Pienciak

2009

Environ. Sci. Technol.

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In 2008, the U.S. Court of Appeals for the District of Columbia Circuit vacated the Clean Air Mercury Rule, which affected the U.S. EPA’s ability to curtail mercury emissions from coal-fired power plants. While the Obama Administration and federal courts address the issue of mercury emissions, many states have laws that are stricter than EPA’s limits. In this issue’s Feature, two researchers from the University of Colorado Boulder overview the history of these rules and present a clearer picture of how U.S. jurisdictions are addressing the mercury released from burning coal to generate electricity.

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Control of Mercury Emissions from Coal-Fired Electric Utility Boilers

Cited by 264 publications

References 8 publications

Control of Hg0 re-emission from gypsum slurries by means of additives in typical wet scrubber conditions

Control of Hg0 re-emission from gypsum slurries by means of additives in typical wet scrubber conditions

Speciation of mercury in fly ashes by temperature programmed decomposition

After the Clean Air Mercury Rule: Prospects for Reducing Mercury Emissions from Coal-Fired Power Plants

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