Assessment of elements, speciation of As, Cr, Ni and emitted Hg for a Canadian power plant burning bituminous coal

Goodarzi, Fariborz; Huggins, Frank E.; Sanei, Hamed

doi:10.1016/j.coal.2007.09.002

Cited by 139 publications

(74 citation statements)

References 34 publications

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“…Nickel was mostly found in oxide form in Canadian coal (Goodarzi et al, 2008), and Ni-bearing minerals (spinels and illites) are common in coalfields close to ultramafic bodies (Ruppert et al, 1996), whilst sulphide minerals containing Ni have been also reported (Finkelman, 1995). Whatever the association in coal, Ni seems to be distributed between the silicate fraction and the magnetic fraction of fly ash during combustion.…”

Section: Nickelmentioning

confidence: 99%

“…Chromium appears to occur in most bituminous coals as Cr 3+ in organic association and primarily as Cr 3+ in illite (Goodarzi et al, 2008;Huggins and Huffman, 2004;Huggins et al, 2000a;Ruppert et al, 1996), whereas there is little evidence for the presence of Cr 6+ (Huggins et al, 1999). The occurrence in illite gives rise to an aluminosilicate association (primarily in glass) in fly ash, remaining as Cr 3+ (Goodarzi et al, 2008;Spears, 2004;Spears and MartinezTarrazona, 2004).…”

Section: Chromiummentioning

confidence: 99%

“…Arsenic condenses on the surface of fly ash particles as sparingly soluble arsenate species (Goodarzi et al, 2008;Huggins et al, 2000b). As an oxyanionic species, As is characterised by a pH-dependent leaching (Figure 1), and displays a plateau of maximum solubility in the pH 7-11 range.…”

Section: Arsenicmentioning

confidence: 99%

“…Moreover, Cr 6+ in coal is easily reduced in flue gases by SO 2 , and thus the dominant speciation in ash is Cr 3+ (Huggins et al, 1999(Huggins et al, , 2000. Several authors have estimated the fraction of Cr +6 oxidation state in fly ash at <5% (Goodarzi et al, 2008;Huggins et al, 1999).…”

Section: Chromiummentioning

confidence: 99%

“…The occurrence in illite gives rise to an aluminosilicate association (primarily in glass) in fly ash, remaining as Cr 3+ (Goodarzi et al, 2008;Spears, 2004;Spears and MartinezTarrazona, 2004). Under such conditions, Cr behaves like other trace metal cation discussed, and would be leachable only under non-environmental conditions, i.e.…”

Section: Chromiummentioning

confidence: 99%

See 4 more Smart Citations

Leaching behaviour of elements from coal combustion fly ash: An overview

Izquierdo

Querol

2012

International Journal of Coal Geology

625

398

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Coal-based power generation produces over 750 Mt of coal ash per year globally, but under 50% of world production is utilised. Large amounts of fly ash are either stored temporarily in stockpiles, disposed of in ash landfills or lagooned. Coal ash is viewed as a major potential source of release of many environmentally sensitive elements to the environment. This paper encompasses over 90 publications on coal fly ash and demonstrates that a large number of elements are tightly bound to fly ash and may not be easily released to the environment, regardless of the nature of the ash. This review provides an extensive look at the extent to which major and trace elements are leached from coal fly ash. It also gives an insight into the factors underlying the leachability of elements and addresses the causes of the mobility. The mode of occurrence of a given element in the parent coal was found to play an important role in the leaching behaviour of fly ash. The amount of calcium in fly ash exerts a dominant influence on the pH of the ash-water system. The mobility of most elements contained in ash is markedly pH sensitive. The alkalinity of fly ash attenuates the release of a large number of elements of concern such as Cd, Co, Cu, Hg, Ni, Pb, Sn or Zn among others, but at the same time, it enhances the release of oxyanionic species such as As, B, Cr, Mo, Sb, Se, V and W. The precipitation of secondary phases such as ettringite may capture and bind several pollutants such ash As, B, Cr, Sb, Se and V.

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Section: Nickelmentioning

confidence: 99%

Section: Chromiummentioning

confidence: 99%

Section: Arsenicmentioning

confidence: 99%

Section: Chromiummentioning

confidence: 99%

Section: Chromiummentioning

confidence: 99%

See 3 more Smart Citations

Leaching behaviour of elements from coal combustion fly ash: An overview

Izquierdo

Querol

2012

International Journal of Coal Geology

625

398

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Environmental Impact of Emissions Originating from the Petroleum Industry

Dunkle¹,

Winniford²

2020

Analytical Techniques in the Oil and Gas Industry for Environmental Monitoring

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The challenge of converting biomass polysaccharides into levulinic acid through heterogeneous catalytic processes

Covinich

Clauser

Felissia

et al. 2019

Biofuels Bioprod Bioref

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The differences between a biorefinery and an oil refinery are determined by the higher oxygen content of the biorefinery's biomass, its high degree of functionalization, its low thermal stability, its polar components, which are mostly acidic, its highly heterogeneous structure, and its quality variation as result of genotypic and phenotypic characteristics. Levulinic acid (LA) is one of the main high value‐added chemicals that can be produced from lignocellulosic biomass as raw material. The main challenges for the conversion of lignocellulosic biomass to levulinic acid are related to the improvement of the technologies to obtain a pure and cost‐competitive product, the design and use of efficient heterogeneous catalysts, and the improvements in the selectivity and useful life of the catalyst. This is an up‐to‐date review of the state of knowledge about the heterogeneous catalytic conversion of biomass into LA, addressing the technical hurdles that impede the attainment of high yields. This work outlines the chemistry of LA synthesis and discusses in detail the influence of the lignocellulosic raw material, reaction time, temperature, solvent according to the chemical pathway, and efficiency of the chosen Lewis and Brønsted solid acid catalysts. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

show abstract

Assessment of elements, speciation of As, Cr, Ni and emitted Hg for a Canadian power plant burning bituminous coal

Cited by 139 publications

References 34 publications

Leaching behaviour of elements from coal combustion fly ash: An overview

Leaching behaviour of elements from coal combustion fly ash: An overview

Environmental Impact of Emissions Originating from the Petroleum Industry

The challenge of converting biomass polysaccharides into levulinic acid through heterogeneous catalytic processes

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