Status of trace element emission in a coal combustion process: a review

Xu, Minghou; Yan, Rong; Zheng, Chenghang; Qiao, Yu; Han, Jun; Sheng, Changdong

doi:10.1016/s0378-3820(03)00174-7

Cited by 362 publications

(254 citation statements)

References 93 publications

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“…Significant enrichment of Cd in bottom ashes has been observed in previous fuel and coal combustion studies (Häsänen et al, 1997 andYan et al, 1999). Elements partially or fully vapourized during roasting usually undergo further transformations and partitioning downstream as the flue gas cools, including condensation, physical adsorption, chemisorptions or chemical reactions Ratafia-Brown 1994 andXu et al, 2003).…”

Section: Discussionmentioning

confidence: 82%

Speciation of some selected heavy metals in coal bottom ash from Okaba Coal, Ankpa, Nigeria

Okorie¹,

Egila²,

Jacob³

2014

Int. J. Bio. Chem. Sci

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Speciation of coal cotton ash from Okaba in Kogi State Nigeria was carried out using flame atomic absorption spectrometry. Results of this research showed that the elements studied (Cr, Fe, Cu, Ni, Pb, Cd and Zn) were all observed in at least three fractions of the sequential extraction procedure. Pb showed more presence in the exchangeable fraction (80±0.03 µg/g) which is a serious problem to plants and human due to weathering activities in the soil. Most of the elements with high concentration in the residual fractions were found to be thermally stable and of low volatility (Cu and Zn). Chromium occurred mostly as a reducible fraction (80±0.02 µg/g) while Fe occurred mostly as bound to carbonate species. Cadmium was generally low in all the fractions analysed. This trend may be attributed to high volatility of Cd species. Similarly, Ni had a distribution in all the fractions with the highest in the reducible fraction (39±0.01 µg/g) and lowest in the carbonate bound fraction (24 ±0.01 µg/g). The exchangeable fraction of the elements studied is consistent with previous studies of coal bottom ash speciation. The ash matrix may also have contributed to a significant rise in the concentration of Ni at the exchangeable fraction thereby leading to significant variations in metal concentration over the ash particle.

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Section: Discussionmentioning

confidence: 82%

Speciation of some selected heavy metals in coal bottom ash from Okaba Coal, Ankpa, Nigeria

Okorie¹,

Egila²,

Jacob³

2014

Int. J. Bio. Chem. Sci

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“…This discrepancy between these two indicators of Pb atmospheric pollution can be explained by the largest Pb E.F. induced by leaded gasoline combustion which would not produce any particles containing Ti. Coal combustion on the other hand would produce particles enriched in Pb but also in Ti (Eskenasy and Stefanova, 2007;Xu et al, 2003), which does not make Pb E.F. the best indicator to follow Pb pollution. The Pb E.F. maximum around ca.…”

Section: History Of Pollution Recorded In Słowińskie Błoto and A Compmentioning

confidence: 98%

Anthropogenic impacts in North Poland over the last 1300years — A record of Pb, Zn, Cu, Ni and S in an ombrotrophic peat bog

Vleeschouwer¹,

Fagel²,

Cheburkin³

et al. 2009

Science of The Total Environment

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Lead pollution history over Northern Poland was reconstructed for the last ca. 1300 years using the elemental and Pb isotope geochemistry of a dated Polish peat bog. The data show that Polish Pb-Zn ores and coal were the main sources of Pb, other heavy metals and S over Northern Poland up until the industrial revolution. After review of the potential mobility of each element, most of the historical interpretation was based on Pb and Pb isotopes, the other chemical elements (Zn, Cu, Ni, S) being considered secondary indicators of pollution. During the last century, leaded gasoline also contributed to anthropogenic Pb pollution over Poland. Coal and Pb-Zn ores, however, remained important sources of pollution in Eastern European countries during the last 50 years, as demonstrated by a high 206 Pb/ 207 Pb ratio (1.153) relative to that of Western Europe (ca. 1.10). The Pb data for the last century were also in good agreement with modelled Pb inventories over Poland and the Baltic region.

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“…Elements that are surface adsorbed can be quite mobile. Leaching of these trace elements from wastes is also controlled by the trace element concentration in coal and their modes of occurrence in coal [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Leaching characteristics of fly ash from fluidized bed combustion thermal power plant: Case study: Çan (Çanakkale-Turkey)

Baba

Gürdal

Sengunalp

2010

Fuel Processing Technology

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It is known that the concentration of elements of fly ash varies due to the used-coal and the used-lime qualities varying in different periods. In the Çan Thermal Power Plant (CTPP) located at northwestern Turkey, Çan (Çanakkale) basin coals, which are classified as lignite to sub-bituminous C coal with high total sulphur (0.4-12.22%) and a broad range of ash contents (3.2-44.6%) are mainly used. Performed studies reveal that some toxic elements exit in the coal, including As, U and V. Also, while the As, Cu, Co and Hg contents in coal increases, the sulphur contents in coal also increase. Additionally, trace elements that have inorganic compounds in coal are mobilized into air during the combustion process. This poses a big risk for human health and keeping the environment when Çan Basins low quality lignite is burned, it's the fly ash that contains several toxic elements which can leach out and contaminate the water resources. In this study, toxicity tests were conducted on the fly ash samples that were obtained from the fluidized bed combustion of Çan Thermal Power Plant. The results showed that water temperature, pH and the quality of the limestone used were the most important factors affecting the leaching properties. Concentration of some toxic elements found in the fly ash, such as; As, Cd, Cr, Pb, Se and Zn were analyzed. Concentration richness of some heavy metals were attributed to the increase of water temperature, especially when pH is lower than 5. At pH = 5 value, there is no clear explanation of each heavy metal presence in the fly ash from fluidized bed combustion thermal power plant.

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Status of trace element emission in a coal combustion process: a review

Cited by 362 publications

References 93 publications

Speciation of some selected heavy metals in coal bottom ash from Okaba Coal, Ankpa, Nigeria

Speciation of some selected heavy metals in coal bottom ash from Okaba Coal, Ankpa, Nigeria

Anthropogenic impacts in North Poland over the last 1300years — A record of Pb, Zn, Cu, Ni and S in an ombrotrophic peat bog

Leaching characteristics of fly ash from fluidized bed combustion thermal power plant: Case study: Çan (Çanakkale-Turkey)

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