Geochemical Factors Controlling the Mobilization of Inorganic Constituents from Fossil Fuel Combustion Residues: II. Review of the Minor Elements

Eary, L. E.; Rai, Dhanpat; Mattigod, Shas V.; Ainsworth, Calvin C.

doi:10.2134/jeq1990.00472425001900020005x

Cited by 191 publications

(80 citation statements)

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“…Traces of Mo are also present. These concentrations are within the ranges reported by Eary et al (1990 (Table 2) typical of leachate from sulphide rich coal mine tailings and underground mine water (Uhlmann et al, 2004).…”

Section: Chemical Characterization Of Fly Ash and Acid Mine Watersupporting

confidence: 86%

“…FA tends to accumulate toxic elements such as heavy metals at the high temperatures involved during its generation Spears and Lee, 2004) and is considered an environmental hazard in South Africa and other parts of the world. Anions (Cl -, SO 4 2-), oxy-anions of Se, As, Mo, B and Cr and cations (Al, Fe, Na, K, Ca, Sr, Ba, Zn, Cu, Cd and Mg) are leached from the ash heaps by the wastewater derived from the ash slurry or by subsequent infiltration by rain upon disposal (Adriano et al, 1980;Eary et al, 1990;Mattigod et al, 1990;Reardon et al, 1995;Nameni et al, 2008). Of main environmental concern are the toxic trace elements, Pb, Cr, B, Mo, As and Se (Adriano et al, 1980;Carlson and Adriano, 1993;Abbott et al, 2001;Spears and Lee, 2004) that are likely to leach upon disposal.…”

Section: Introductionmentioning

confidence: 99%

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Partitioning of major and trace inorganic contaminants in fly ash acid mine drainage derived solid residues

Gitari

Petrik

Key

et al. 2010

Int. J. Environ. Sci. Technol.

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Acid mine drainage was reacted with coal fly ash over a 24 h reaction time and species removal trends evaluated. The evolving process water chemistry was modeled by the geochemical code PHREEQC using WATEQ4 database. Mineralogical analysis of the resulting solid residues was done by X-ray diffraction analysis. Selective sequential extraction was used to evaluate the transfer of species from both acid mine drainage and fly ash to less labile mineral phases that precipitated out. The quantity of fly ash, volume of acid mine drainage in the reaction mixture and reaction time dictated whether the final solution at a given contact time will have a dominant acidic or basic character. Inorganic species removal was dependent on the pH regime generated at a specific reaction time. Sulphate concentration was controlled by precipitation of gypsum, barite, celestite and adsorption on iron-oxy-hydroxides at pH > 5.5. Increase of pH in solution with contact time caused the removal of the metal ions mainly by precipitation, coprecipitation and adsorption. PHREEQC predicted precipitation of iron, aluminium, manganese-bearing phases at pH 5.53-9.12. An amorphous fraction was observed to be the most important in retention of the major and minor species at pH > 6.32. The carbonate fraction was observed to be an important retention pathway at pH 4-5 mainly due to initial local pockets of high alkalinity on surfaces of fly ash particles. Boron was observed to have a strong retention in the carbonate fraction.

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Section: Chemical Characterization Of Fly Ash and Acid Mine Watersupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Partitioning of major and trace inorganic contaminants in fly ash acid mine drainage derived solid residues

Gitari

Petrik

Key

et al. 2010

Int. J. Environ. Sci. Technol.

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“…The concentration of Ca is showed 0.07 wt.% in YD1, Fe are showed 0.36 wt.% in YD2 and YD3, and S is showed 0.03 wt.% in EPA. And the concentration of most trace elements showed content within utility range of fly ash and soils suggested by Eary et al (1990). While the concentration of As and Cu showed 0.2 mg/kg and 25.3mg/kg in YD1, these were lower than utility range of fly ash, concentration of Mo of EPA is higher than utility range of soils suggested by Eary et al (1990).…”

Section: Ash Pondmentioning

confidence: 79%

“…Although, these are used for domestic anthracite, it is believe these differences are related to the content of coal. Table 4 is showed concentrations of major and trace elements in fly ash produced from YD Coal-Fired Power Plant and the contents in utility range of fly ash suggested by Mattigod et al (1990) and Eary et al (1990). The most major elements of fly ash exhausted by YD CoalFired Power Plant showed the content in utility range of fly ash and soils suggested by Mattigod et al (1990).…”

Section: Ash Pondmentioning

confidence: 98%

A Biogeochemical Study of Heavy Metal Leaching from Coal Fly Ash Disposed in Yeongdong Coal-Fired Power Plant

Chung¹,

Cho²,

Park

2011

Journal of the Korean earth science society

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Fly ashes derived from coal fired power plants have unique chemical and mineralogical characteristics. The objective of this research was to study how indigenous bacteria affected heavy metal leaching in fly ash slurry during the fly ash-seawater interactions in the ash pond located in Yeongdong seashore, Korea. The in-situ pH of ash pond seawater was 6.3-8.5. For this study, three sites of the ash pond were chosen to collect a sample of fly ash slurry. Three samples that had a mix of fly ash (0.4 L) and seawater (1.6 L) were collected at each site. First sample was autoclaved (120 o C, 2.5 atm), second one was inoculated with glucose to stimulate the microbial activity, and the last sample was kept in the natural condition. Compared with other samples including autoclaved and natural samples, the glucose added sample showed sharp increase in its alkalinity after 15 days, cation concentration change such as Ca, Mg, and K seemed to increase in early stage, and then decrease 15 days later in slurry solution of glucose added sample, and a possibly considerable decrease in SO4 2− in the fly ash slurry samples when glucose was added to stimulate the microbial activity.Geochemical data of this study is likely to be related to the activity of bacteria at the ash pond. The result may be used to understand about the characteristic of bacteria.

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“…Coal Fly Ash Beneficiation -Treatment of Acid Mine Drainage with Coal Fly Ashcoal combustion ( temperature, air/fuel ratio, coal pulverization size, and rate of combustion), the eiciency of emission control devices, the storage and handling of the by-products, and the climate [10,11].…”

Section: Coal Ly Ash Generation and Its Physicochemical Propertiesmentioning

confidence: 99%

Introductory Chapter: Coal Fly Ash and Its Application for Remediation of Acid Mine Drainage

Gitari¹,

Akinyemi²

2018

Coal Fly Ash Beneficiation - Treatment of Acid Mine Drainage With Coal Fly Ash

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Geochemical Factors Controlling the Mobilization of Inorganic Constituents from Fossil Fuel Combustion Residues: II. Review of the Minor Elements

Cited by 191 publications

References 0 publications

Partitioning of major and trace inorganic contaminants in fly ash acid mine drainage derived solid residues

Partitioning of major and trace inorganic contaminants in fly ash acid mine drainage derived solid residues

A Biogeochemical Study of Heavy Metal Leaching from Coal Fly Ash Disposed in Yeongdong Coal-Fired Power Plant

Introductory Chapter: Coal Fly Ash and Its Application for Remediation of Acid Mine Drainage

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