Arsenic Leachability of Coal Fly Ashes from Different Types of Coal Fired Power Plants

Hartuti, Sri; Kambara, Shinji; Takeyama, Akihiro

doi:10.17265/2161-6213/2017.7-8.001

Cited by 2 publications

(2 citation statements)

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“…Hayashi [8] studied the chemical state of boron in coal fly ash and concluded that boron associated with calcium and magnesium is difficult to leach. Wang [9] stated that As and Se have a high mobility in alkaline pH, and Sri et al [10,11] stated that leaching of arsenic is related to calcium oxide content in coal fly ash.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Study on Additives for Controlling As, Se, B, and F Leaching from Coal Fly Ash

et al. 2018

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The application of paper sludge ash as an additive in controlling the leaching of trace elements has been satisfactorily effective to date. Previous studies have found that paper sludge ash has a promising effect in controlling the leaching of arsenic, selenium and boron. The content of calcium oxide in paper sludge ash is believed to be one of the important factors in decreasing the concentration of trace elements in leachate. Therefore, this study aimed to verify the effect of paper sludge ash in the leaching process and to propose an effective and applicable suppressing material that can control the leaching of As, Se, B and F simultaneously. In light of this aim, Ca(OH)2, PS ash 8 and blast furnace cement (BF cement) were tested as single and mixed additives in two different coal fly ashes (FA C and FA H). The results indicate that the application of a mixture of additives is necessary to control the leaching of trace elements. A mixture of PS ash 8, Ca(OH)2 and blast furnace cement (BF cement) was proposed to be an applicable and suitable additive that could suppress arsenic, selenium, boron, and fluorine leaching simultaneously.

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Section: Introductionmentioning

confidence: 99%

Preliminary Study on Additives for Controlling As, Se, B, and F Leaching from Coal Fly Ash

et al. 2018

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“…The leaching of As and Se from acidic ashes could be described by sorption of iron oxide, while the leaching from the alkaline ashes appeared to be controlled by sorption in the alkaline calcium phase [20,23]. The presence of Ca in fly ash plays an important role in the leaching behavior of As, B, and Se, in which the leaching of As, B, and Se may involve the trapping of As, B, and Se species by the ettringite phase (3CaO·Al 2 O 3 ·3CaSO 4 ·32H 2 O), leading to a decrease in leaching under alkaline conditions [18,19,[24][25][26][27][28]. Therefore, Ca content and the sorption process are known to play important roles in the release of As, B, and Se from CFA.…”

Section: Introductionmentioning

confidence: 99%

Chemical Stabilization of Coal Fly Ash for Simultaneous Suppressing of As, B, and Se Leaching

Hartuti¹,

Kambara²,

Takeyama³

et al. 2018

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

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The discard of coal fly ash produced from the combustion of pulverized coal in a coal-fired boiler of thermal power plants has led to environmental concerns. Due to the interaction of fly ash particles with weathering and hydrological processes, the rainfall leaches out toxic elements in coal fly ash from the ash heaps. This situation has been pointed out as a potential contamination of soil, surface, and groundwater. In this chapter, the available fly ash treatment techniques to minimize future release of toxic trace elements (arsenic, boron, and selenium) have been documented, and the recent investigations dealing with leaching suppression effect of arsenic, boron, and selenium from coal fly ash have been reviewed. The leaching characteristics of arsenic, boron, and selenium are discussed, and a simple and low-cost leaching control method is presented in the context of treating the fly ash through chemical stabilization technique using additives containing high levels of calcium. Experimental results described in this chapter show the chemical stabilization technique utilizing Ca-containing additives is an effective technique for simultaneous suppressing of As, B, and Se leaching from coal fly ash.

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Arsenic Leachability of Coal Fly Ashes from Different Types of Coal Fired Power Plants

Cited by 2 publications

References 11 publications

Preliminary Study on Additives for Controlling As, Se, B, and F Leaching from Coal Fly Ash

Preliminary Study on Additives for Controlling As, Se, B, and F Leaching from Coal Fly Ash

Chemical Stabilization of Coal Fly Ash for Simultaneous Suppressing of As, B, and Se Leaching

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