Evaluation of the distribution of heavy metals and their chemical forms in ESP-fractions of fly ash

Świetlik, Ryszard; Trojanowska, Marzena; Jóźwiak, Małgorzata

doi:10.1016/j.fuproc.2011.11.019

Cited by 46 publications

(28 citation statements)

References 33 publications

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“…As seen from Tables 3a, 3b, for all the fractions, most of trace elements gave higher leaching rates for TCLP 1311 compared to ASTM method due to its slightly harsher conditions. It is also possible to say that higher trace element concentrations (Cd, Pb, Cu) were observed in the leachates of finer particle size fractions for TCLP 1311 method [42]. Higher Cr (VI) concentrations were detected in the leachates of the finest particle size fraction for both test methods.…”

Section: Results Of the Toxicity Test Proceduresmentioning

confidence: 84%

“…Coal contains significant amount of various trace metals. Most of these trace elements are emitted largely in the fly ash or in association with the surface species of fly ash particles during coal combustion [9][10][11][12]. It has been reported that trace element concentrations in fly ash are sometimes 4-10 times higher than their original concentrations in coal samples.…”

Section: Introductionmentioning

confidence: 99%

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Leaching behavior of selected trace elements in coal fly ash samples from Yenikoy coal-fired power plants

Akar

Polat

Galecki

et al. 2012

Fuel Processing Technology

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Keywords:Coal fly ash Coal-fired power plants Trace element leaching Short-term leaching test results of alkaline fly ash from Yenikoy coal-fired power plant were reported in this paper. ASTM D-3987-85 and TCLP-1311 test methods were applied to determine leaching behavior of selected elements namely, Fe, Ca, Cu, Co, Cd, Mn, Ni, Pb Zn, and Cr (VI) at different particle size fractions and test conditions. Chemical, mineralogical and morphological characterizations of ash samples were also performed using chemical, XRD and SEM-EDS analysis methods. The results showed that CaO dominates in the Yenikoy fly ash sample which directly affects the mobility of trace elements by determining the pH of the leaching medium. Higher mobility values of Cd, Co Cu, Pb, Ni and Zn elements were observed for TCLP-1311 procedure. The concentration of these elements in leachates showed a tendency to increase by decreasing particle size. Overall results suggested that the amount of the selected elements in the final leachates of both tests was lower than the limit values of landfill regulations except Cr (VI).

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Section: Results Of the Toxicity Test Proceduresmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Leaching behavior of selected trace elements in coal fly ash samples from Yenikoy coal-fired power plants

Akar

Polat

Galecki

et al. 2012

Fuel Processing Technology

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“…Of the measured TEs concentration in fly ash, Be, Cd, Ni, and Pb were detected in fly ash while concentrations of As, Hg, Se, and Cr were below detection limit. A study by Swietlik et al (2012) reported the occurrence of Cd and Pb in fly ash from ESP where Cd was detected at very low concentration (<1.5 mg/kg), indicating discharge to the atmosphere, while Pb concentration was increasing with decreasing particle size, which confirmed the mechanism of formation through a volatilization-condensation process.…”

Section: Tes Behavior In Flue Gasmentioning

confidence: 82%

“…This is due to the volatilization of TEs during combustion and condensation on the surface of fly ash particles. A study by Swietlik et al (2012) showed that the concentrations of volatile TEs (Cd, Cu, Pb, and Zn) increase with decreasing particle size of fly ash that has higher surface area, whereas hardly volatile TEs (Fe and Mn) showed slight reduction. The elements in fly ash from firing of subbituminous and bituminous coal are shown in Table 8.…”

Section: Resultsmentioning

confidence: 99%

Understanding selected trace elements behavior in a coal-fired power plant in Malaysia for assessment of abatement technologies

Mokhtar

Taib

Hassim

2014

Journal of the Air & Waste Management Association

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The Proposed New Environmental Quality (Clean Air) Regulation 201X (Draft), which replaces the Malaysia Environmental Quality (Clean Air) 1978, specifies limits to additional pollutants from power generation using fossil fuel. The new pollutants include Hg, HCl, and HF with limits of 0.03, 100, and 15 mg/N-m 3 at 6% O 2 , respectively. These pollutants are normally present in very small concentrations (known as trace elements [TEs]), and hence are often neglected in environmental air quality monitoring in Malaysia. Following the enactment of the new regulation, it is now imperative to understand the TEs behavior and to assess the capability of the existing abatement technologies to comply with the new emission limits. This paper presents the comparison of TEs behavior of the most volatile (Hg, Cl, F) and less volatile (As, Be, Cd, Cr, Ni, Se, Pb) elements in subbituminous and bituminous coal and coal combustion products (CCP) (i.e., fly ash and bottom ash) from separate firing of subbituminous and bituminous coal in a coal-fired power plant in Malaysia. The effect of air pollution control devices configuration in removal of TEs was also investigated to evaluate the effectiveness of abatement technologies used in the plant. This study showed that subbituminous and bituminous coals and their CCPs have different TEs behavior. It is speculated that ash content could be a factor for such diverse behavior. In addition, the type of coal and the concentrations of TEs in feed coal were to some extent influenced by the emission of TEs in flue gas. The electrostatic precipitator (ESP) and seawater flue gas desulfurization (FGD) used in the studied coal-fired power plant were found effective in removing TEs in particulate and vapor form, respectively, as well as complying with the new specified emission limits. Implications: Coals used by power plants in Peninsular Malaysia come from the same supplier (Tenaga Nasional Berhad Fuel Services), which is a subsidiary of the Malaysia electricity provider (Tenaga Nasional Berhad). Therefore, this study on trace elements behavior in a coal-fired power plant in Malaysia could represent emission from other plants in Peninsular Malaysia. By adhering to the current coal specifications and installation of electrostatic precipitator (ESP) and flue gas desulfurization, the plants could comply with the limits specified in the Malaysian Department of Environment (DOE) Scheduled Waste Guideline for bottom ash and fly ash and the Proposed New Environmental Quality (Clean Air) Regulation 201X (Draft).

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“…The F(5) fraction was extracted in the same way as sample pre-treatment in order to determine the pseudo-total metal content (HNO 3 /H 2 O 2 , microwave assisted) . It was called an environmentally persistent fraction to differentiate it from the term residue fraction which is commonly used when sample digestion is carried out in the presence of HF ( Swietlik et al, 2012). In this way the metal distribution pattern obtained involves only that part of total metal content which may be potentially mobilisable with changing environmental conditions in ecological timescale.…”

Section: Chemical Fractionationmentioning

confidence: 99%

Fractionation and mobility of Cu, Fe, Mn, Pb and Zn in the road dust retained on noise barriers along expressway – A potential tool for determining the effects of driving conditions on speciation of emitted particulate metals

Świetlik

Trojanowska

Strzelecka

et al. 2015

Environmental Pollution

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Evaluation of the distribution of heavy metals and their chemical forms in ESP-fractions of fly ash

Cited by 46 publications

References 33 publications

Leaching behavior of selected trace elements in coal fly ash samples from Yenikoy coal-fired power plants

Leaching behavior of selected trace elements in coal fly ash samples from Yenikoy coal-fired power plants

Understanding selected trace elements behavior in a coal-fired power plant in Malaysia for assessment of abatement technologies

Fractionation and mobility of Cu, Fe, Mn, Pb and Zn in the road dust retained on noise barriers along expressway – A potential tool for determining the effects of driving conditions on speciation of emitted particulate metals

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