Characteristics of coal combustion products (CCP's) from Kentucky power plants, with emphasis on mercury content

Hower, James C.; Robl, Thomas L.; Anderson, Corby; Thomas, Gerald A.; Sakulpitakphon, Tanaporn; Mardon, Sarah M.; Clark, Wendy

doi:10.1016/j.fuel.2004.09.029

Cited by 63 publications

(51 citation statements)

References 16 publications

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“…The inorganic ash chemistry is dominated by SiO 2 and Al 2 O 3 , followed by Fe 2 O 3 , with lesser amounts of K 2 O, CaO, TiO 2 , and the other major oxides. Basically, the minor element chemistry is similar to what we expect for lowand medium-S Central Appalachian coals, as seen in the summaries for similar coals (<1% S and 1-2% S, respectively) burned in Kentucky power plants (Hower et al, 1996(Hower et al, , 1999a(Hower et al, , 2005(Hower et al, , 2009…”

Section: Chemistrysupporting

confidence: 58%

“…In light of current concerns about the long-term environmental viability of ash disposal ponds, the ash is currently (started in 2015, planned to continue through 2017) being excavated and moved from the current site on the river floodplain to a landfill at another companyowned facility. As a rough estimate based on the age of the pond and the amount of ash produced per year, as extrapolated from ash production amounts backing the state-wide numbers published by Hower et al (1996Hower et al ( , 1999aHower et al ( , 2005Hower et al ( , 2009Hower et al ( , 2014, we estimate that there is about 2 Mt of ash in the pond/landfill. For an ash feed rate of 100 t/day in a commercial extraction plant, this supply would last decades.…”

Section: Introductionmentioning

confidence: 93%

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Ponded and Landfilled Fly Ash as a Source of Rare Earth Elements from a Kentucky Power Plant

Hower¹,

Groppo²,

Henke³

et al. 2017

CCGP

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A B S T R A C TTwenty samples, with one composite sample built out of the 20 individual samples, of ponded ash were collected at a Kentucky power plant. The coal feed throughout the history of the power plant was central eastern Kentucky low-to moderate-S high volatile A bituminous coal. The pond was in the process of being excavated, with the ash moved to a landfill on another company property. In spite of the long history of the pond and the expected variation in coal supply, and perhaps because of the mixing due to the excavation, there is little variation in ash-basis rare earth elements plus yttrium among the 20 sites.

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Section: Chemistrysupporting

confidence: 58%

Section: Introductionmentioning

confidence: 93%

Ponded and Landfilled Fly Ash as a Source of Rare Earth Elements from a Kentucky Power Plant

Hower¹,

Groppo²,

Henke³

et al. 2017

CCGP

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“…Boron is associated with the easily leachable fraction of elements 20 that adsorbed onto the fly ash particles during cooling of exhaust gas. Since there is no species-specific preferential leaching to water (i.e., 11 B-enriched boric acid relative to the 10 B-depleted tetrahedral boron), no isotopic fractionation is expected during the leaching of boron from CCRs and thus the boron isotopic imprints of contaminated water would mimic the CCR composition.…”

Section: ■ Introductionmentioning

confidence: 99%

Boron and Strontium Isotopic Characterization of Coal Combustion Residuals: Validation of New Environmental Tracers

Ruhl

Dwyer

Hsu‐Kim

et al. 2014

Environ. Sci. Technol.

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In the U.S., coal fired power plants produce over 136 million tons of coal combustion residuals (CCRs) annually. CCRs are enriched in toxic elements, and their leachates can have significant impacts on water quality. Here we report the boron and strontium isotopic ratios of leaching experiments on CCRs from a variety of coal sources (Appalachian, Illinois, and Powder River Basins). CCR leachates had a mostly negative δ11B, ranging from −17.6 to +6.3‰, and 87Sr/86Sr ranging from 0.70975 to 0.71251. Additionally, we utilized these isotopic ratios for tracing CCR contaminants in different environments: (1) the 2008 Tennessee Valley Authority (TVA) coal ash spill affected waters; (2) CCR effluents from power plants in Tennessee and North Carolina; (3) lakes and rivers affected by CCR effluents in North Carolina; and (4) porewater extracted from sediments in lakes affected by CCRs. The boron isotopes measured in these environments had a distinctive negative δ11B signature relative to background waters. In contrast 87Sr/86Sr ratios in CCRs were not always exclusively different from background, limiting their use as a CCR tracer. This investigation demonstrates the validity of the combined geochemical and isotopic approach as a unique and practical identification method for delineating and evaluating the environmental impact of CCRs.

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“…In the case of mercury it has been observed that some fly ashes may capture this element which would otherwise be emitted to the atmosphere. Although the role of inorganic components of fly ashes in this capture is still unclear, great attention has been paid to the capture of mercury by unburned fly ash carbons [7][8][9][10][11][12][13][14]. A relationship has been reported between Hg content and the percentage of carbon in fly ashes derived from the combustion of bituminous coals [9] and coal blends containing anthracites [14][15].…”

Section: Introductionmentioning

confidence: 99%

The influence of carbon particle type in fly ashes on mercury adsorption

López-Antón

Abad-Valle

Dı́az-Somoano

et al. 2009

Fuel

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Recent research has shown that certain fly ash materials produced in coal combustion for power generation have an affinity for the mercury compounds present in flue gases. However, the exact nature of Hg-fly ash interactions is still unknown and the different variables that influence mercury adsorption need to be identified. In this work the microscopic components of fly ashes derived from the combustion of different types of feed blends of different coal rank and mercury adsorption were investigated. The aim of this research was to establish relationships between Hg retention and the type of unburned carbons present in various fly ashes. The fly ashes and fly ash fractions studied were used as sorbent beds for high mercury concentrations, conditions in which mercury retention is highly favored. From the results obtained it was confirmed that the role of the unburned carbon components in mercury capture may depend, among other factors, on the type of unburned carbon. Fly ashes capture different species of mercury depending on their nature and the type of anisotropic particles.

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Characteristics of coal combustion products (CCP's) from Kentucky power plants, with emphasis on mercury content

Cited by 63 publications

References 16 publications

Ponded and Landfilled Fly Ash as a Source of Rare Earth Elements from a Kentucky Power Plant

Ponded and Landfilled Fly Ash as a Source of Rare Earth Elements from a Kentucky Power Plant

Boron and Strontium Isotopic Characterization of Coal Combustion Residuals: Validation of New Environmental Tracers

The influence of carbon particle type in fly ashes on mercury adsorption

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