Separation and chemical characterization of finely-sized fly-ash particles

Campbell, James A.; Laul, J. C.; Nielson, K.K.; Smith, Richard D.

doi:10.1021/ac50030a009

Cited by 147 publications

(82 citation statements)

References 24 publications

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“…Of these wastes, especially the fly ashes, cling to the surface of the elements [1][2][3]. These toxic pollutants can leach out and contaminate soils, as well as surface water and groundwater [2,[4][5][6][7][8][9][10][11][12]. Fluidized bed combustion technology is a clean and effective technology to burn coals with high sulphur and ash contents, but with low calorific values.…”

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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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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“…These researchers reported that Se concentrations were inversely related to particle size and further that the calculated EF of the 2 MMAD particle was 2 times that of the 50-pm particle. In another study conducted in the USA (Campbell et al, 1978), the EF for Se in the fine particles compared to larger particles was 9.9, illustrating that some variation occurs between coal plants or in sampling and analytical techniques.…”

Section: Selenium Enrichment Factors In Aerosols Particulates and Pmentioning

confidence: 98%

Selenium in Seleniferous Environments

Mayland

James

Panter

et al. 2015

Selenium in Agriculture and the Environment

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Selenium is biologically important because (i) it is essential in animal and possibly plant metabolism, (ii) in many areas diets do not contain sufficient Se to meet, animals' needs, and (iii) in other areas it is toxic to animals when it occurrs in high concentrations in soil, water, plants, fly ash, or in aerosols. Animals require 0.05 to 0.1 mg Se/kg in their diets to prevent Se deficiency but suffer Se toxicosis when dietary levels exceed 5 to 15 mg Se/kg. The earth's crustal materials generally contain <0.1 mg Se/kg. Higher concentrations are found in Cretaceous shales. The Seaccumulator plants growing on the seleniferous soils may contain hundreds or even thousands of mg Se/kg. However, the nonaccumulator grasses and forbs seldom accumulate >50 mg Se/kg and more often contain <5 mg Se/kg. Soils and plants may discharge volatile forms of Se into the atmosphere. However, plants may also absorb measurable amounts of gaseous Se from the atmosphere. Anthropogenic activities impact the amount of Se entering our nation's lakes, rivers, and the atmosphere. Combustion of coal and incineration of municipal waste exhaust Se into the environment. In addition, crop-fallow and irrigation practices that allow leaching waters to pass through seleniferous strata prior to intersecting with surface flow, augment the Se levels encountered by plant and animal life.In 1857, U.S. Army Surgeon T.W. Madison described toxicity symptoms in horses (Equus caballus) grazing near Fort Randall, SD (Rosenfeld & Beath, 1964). Since then, ranchers in that area have continued to experience livestock losses. They associated the toxicosis with the saline seeps and outcrops, com-

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“…Ugurlu (2004) indicated that the main problem related to fly ash disposal was the residue heavy metal content. Numerous experimental studies show that toxic trace metals can be leached from fly ash (Georgakopoulos et al 2002;Baba and Kaya 2004;Baba and Ayyıldız 2006;Burcu et al 1997;Campbell et al 1978;Davison et al 1974;Gehrs et al 1979;Hulett et al 1980;Hansen and Fisher 1980;Klein et al 1975).…”

Section: Mining Activitymentioning

confidence: 99%

Groundwater contamination and its effect on health in Turkey

Baba

Tayfur

2011

Environ Monit Assess

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The sources of groundwater pollution in Turkey are identified, and pathways of contaminants to groundwater are first described. Then, the effects of groundwater quality on health in Turkey are evaluated. In general, sources of groundwater contamination fall into two main categories: natural and anthropogenic sources. Important sources of natural groundwater pollution in Turkey include geological formations, seawater intrusion, and geothermal fluid(s). The major sources of anthropogenic groundwater contamination are agricultural activities, mining waste, industrial waste, on-site septic tank systems, and pollution from imperfect well constructions. The analysis results revealed that natural contamination due to salt and gypsum are mostly found in Central and Mediterranean regions and arsenic in Aegean region. Geothermal fluids which contain fluoride poses a danger for skeleton, dental, and bone problems, especially in the areas of Denizli, Isparta, and Aydın. Discharges from surface water bodies contaminate groundwater by infiltration. Evidence of such contamination is found in Upper Kızılırmak basin, Gediz basin, and Büyük Melen river basin and some drinking A. Baba (B) · G. Tayfur Department of Civil Engineering, Izmir Institute of Technology, Urla,İzmir, Turkey e-mail: alperbaba@iyte.edu.tr water reservoirs inİstanbul. Additionally, seawater intrusion causes groundwater quality problems in coastal regions, especially in the Aegean coast. Industrial wastes are also polluting surface and groundwater in industrialized regions of Turkey. Deterioration of water quality as a result of fertilizers and pesticides is another major problem especially in the regions of Mediterranean, Aegean, Central Anatolia, and Marmara. Abandoned mercury mines in the western regions of Turkey, especially in Çanakkale,İzmir, Mugla, Kütahya, and Balıkesir, cause serious groundwater quality problems.

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Separation and chemical characterization of finely-sized fly-ash particles

Cited by 147 publications

References 24 publications

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

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

Selenium in Seleniferous Environments

Groundwater contamination and its effect on health in Turkey

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