Leaching behaviour of selected trace elements in chemically weathered alkaline fly ash

Warren, C.J.; Dudas, M. J.

doi:10.1016/0048-9697(88)90110-6

Cited by 63 publications

(38 citation statements)

References 27 publications

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“…Around 50-60% Pb is estimated to be in surface association in fly ash (Spears and Martinez-Tarrazona, 2004), although the findings of Warren and Dudas (1988) suggest that the majority of Pb is probably associated with the internal glassy matrix of fly ash, and is therefore not readily leached even under extended acidic weathering. Kim and Kazonich (2004) also reported a dominant silicate association.…”

Section: Leadmentioning

confidence: 92%

“…Manganese is likely associated with ferromagnetic particles and/or the glass fraction in ash (Kim and Kazonich, 2004;Warren and Dudas, 1988). Although Mn in the the glass was found to be more soluble than that contained in the magnetic fraction (Kukier et al, 2003), both modes of occurrence would be responsible for the extremely low leaching rates that Querol et al (2001) determined.…”

Section: Manganesementioning

confidence: 99%

“…Since clay minerals in coal give rise to the glassy matrix of fly ash during combustion, Ti is assimilated and retained within the aluminosilicate glassy matrix along with silicon. The findings of Warren and Dudas (1988) pointed to an almost exclusive partitioning of Ti into the internal matrix of ash particles. Although Ti might be expected to follow the leaching pattern of silicon, it is virtually immobile throughout the whole pH range.…”

Section: Titaniummentioning

confidence: 99%

“…This leaching pattern points to a quick washout of readily soluble salts. Warren and Dudas (1988) suggested that Cs is primarily associated with the less soluble internal matrix of fly ash particles. Thus, Cs would be released through a process of solid state migration, similar to the process that occurs in other glassy materials.…”

Section: Cesiummentioning

confidence: 99%

“…The leachable levels sharply decrease towards slightly acidic values (pH 3-5), and remain very low across the rest of the pH range. Any Fe in solution precipitates as amorphous oxyhydroxide in response to an increase in the pH values (Warren and Dudas, 1988). Negligible proportions of Fe were found to be leached from fly ash (Ward et al, 2003).…”

Section: Ironmentioning

confidence: 99%

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

Izquierdo

Querol

2012

International Journal of Coal Geology

632

379

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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: Leadmentioning

confidence: 92%

Section: Manganesementioning

confidence: 99%

Section: Titaniummentioning

confidence: 99%

Section: Cesiummentioning

confidence: 99%

Section: Ironmentioning

confidence: 99%

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

Izquierdo

Querol

2012

International Journal of Coal Geology

632

379

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Radioactivity of Technosols on thermal power station ash disposal sites: Assessment of potential radiological human‐health risk

Uzarowicz,

Stobiński,

Jędrzejek

et al. 2024

Land Degrad Dev

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Soil radioactivity is a poorly recognized form of land degradation; however, there are regions all around the world where it can be dangerous to the environment and human health. The aim of the study was to analyze the radioactivity of Technosols developed on thermal power station (TPS) ash disposal sites. Total concentration of uranium (U), thorium (Th), and cesium (Cs), as well as the radioactivity of select radionuclides in Technosols were determined to recognize the level of radioactivity and to assess the potential radiological health risk. Total U, Th and Cs concentrations in Technosols were in ranges 1.5 to 11.3, 4 to 22.9, and 0.2 to 21.3 mg·kg−1, respectively. The radioisotope activities in Technosols (in Bq·kg−1) were in the 1.6–25.5 (137Cs); 29.2–1265 (40K); 26.2–99.9 (228Th); 27.9–100 (228Ra); 20.5–134. (226Ra); 32.8–177 (210Pb); 23.9–144 (238U); 1.2–7.0 (235U) ranges. The activity concentrations were slightly higher than the activities of non‐contaminated soils. Technosols developed from bituminous coal ash had higher 40K, 228Th, and 228Ra activity concentrations than soils developed from lignite ash. Artificial 137Cs occurred in surface horizons of Technosols due to fall of atmospheric dust enriched in 137Cs. Annual effective dose (AED) in Technosols amounted 0.07–0.16 mSv·a−1 and was somewhat higher than the global and Polish average (0.06 and 0.07 mSv·a−1, respectively) for outdoor external terrestrial radiation. The radioactivity of the investigated Technosols is slightly above the average radioactivity of native soils. The radiological human‐health risk related to the analyzed soils is low.

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Occurrence of Scandium and Yttrium in Nature

Horovitz¹

1999

Biochemistry of Scandium and Yttrium, Part 1: Physical and Chemical Fundamentals

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Leaching behaviour of selected trace elements in chemically weathered alkaline fly ash

Cited by 63 publications

References 27 publications

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

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

Radioactivity of Technosols on thermal power station ash disposal sites: Assessment of potential radiological human‐health risk

Occurrence of Scandium and Yttrium in Nature

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