Compositions and leaching behaviours of combustion residues

Saikia, Nabajyoti; Kato, Shigeru; Kojima, Toshinori

doi:10.1016/j.fuel.2005.03.035

Cited by 71 publications

(43 citation statements)

References 18 publications

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“…The particles having relatively high density and nonporous outer surface may resist leaching of heavy metals [4,20]. That's why, SEM analysis was applied to find out morphological properties of the particles using a Philips XL-30S FEG type instrument at different magnifications and results are given in Fig.…”

Section: Mineralogical Characterization Of Yenikoy Fly Ash Samplementioning

confidence: 99%

“…There are large numbers of papers on prediction of leaching behavior of metals from coal fly ash. The researchers reported that the particle size, initial concentration of trace elements, pH of solution, leaching time, solid-liquid ratio and other properties of the leaching environment are important factors affecting the mobility of the trace elements in aqueous environments [16][17][18][19][20].…”

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: Mineralogical Characterization Of Yenikoy Fly Ash Samplementioning

confidence: 99%

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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“…In literature, the characterization of the solid wastes produced during the MSW incineration has been reported by a number of studies [1,[30][31][32][33][34][35][36][37][38][39][40][41][42]. However, it is important to analyse which is the type of the solid waste that was considered in a particular study before using the corresponding data.…”

Section: Introductionmentioning

confidence: 99%

Characterization of air pollution control residues produced in a municipal solid waste incinerator in Portugal

Quina

Santos²,

Bordado

et al. 2008

Journal of Hazardous Materials

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This study is mainly related with the physical and chemical characterization of a solid waste, produced in a municipal solid waste (MSW) incineration process, which is usually referred as air pollution control (APC) residue. The moisture content, loss on ignition (LOI), particle size distribution, density, porosity, specific surface area and morphology were the physical properties addressed here. At the chemical level, total elemental content (TC), total availability (TA) and the leaching behaviour with compliance tests were determined, as well as the acid neutralization capacity (ANC). The main mineralogical crystalline phases were identified, and the thermal behaviour of the APC residues is also shown. The experimental work involves several techniques such as laser diffraction spectrometry, mercury porosimetry, helium pycnometry, gas adsorption, flame atomic absorption spectrometry (FAAS), ion chromatography, scanning electron microscopy (SEM), X-ray fluorescence (XRF), X-ray diffraction (XRD) and simultaneous thermal analysis (STA). The results point out that the APC residues do not comply with regulations in force at the developed countries, and therefore the waste should be considered hazardous. Among the considered heavy metals, lead, zinc and chromium were identified as the most problematic ones, and their total elemental quantities are similar for several samples colleted in an industrial plant at different times. Moreover, the high amount of soluble salts (NaCl, KCl, calcium compounds) may constitute a major problem and should be taken into account for all management strategies. The solubility in water is very high (more than 24% for a solid/liquid ratio of 10) and thus the possible utilizations of this residue are very limited, creating difficulties also in the ordinary treatments, such as in solidification/stabilization with binders.

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“…The ash that was isolated by filtration was shaken again in another 20 mL extraction solution for 24 h before another aqueous extract was collected for analysis. This procedure was repeated five times, in accordance with the method of Saikia et al (2006). The electrical conductivity (EC), pH, and elemental composition of the leachates were determined by the methods described in the next section.…”

Section: Leaching Experimentsmentioning

confidence: 99%

“…Accordingly, a number of different leaching tests have been developed (Fallman and Aurell 1996;Saikia et al 2006). commission has even developed several new methods to harmonize the use of these tests (Hage and Mulder 2004).…”

Section: Introductionmentioning

confidence: 99%

Environmental benefits of using magnesium carbonate minerals as new wildfire retardants instead of commercially available, phosphate-based compounds

Liodakis

Tsoukala

2009

Environ Geochem Health

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A serial batch leaching experiment has been carried out to evaluate the release of elements from the ash of Pinus halepensis needles burned under two test conditions-with and without treatment of the forest species with the carbonate minerals (huntite and hydromagnesite) in aqueous solution (pH 6). The ash (before and after leaching) and leachates were analyzed using atomic absorption spectroscopy and X-ray diffraction. Compared with data from samples treated with the commercially available, phosphate-based fire retardant diammonium phosphate (DAP), we found that use of huntite or hydromagnesite was much more successful in obstructing the release of the toxic elements present in the ash, probably because of the alkaline conditions resulting from decomposition of the minerals during burning. In contrast, DAP tended to be more able to facilitate the extraction of some toxic metals (e.g., Zn, Cu, Mn), probably because of the acidic conditions resulting from its decomposition to phosphoric acid. Data from this study thus lend strong support to the use of magnesium carbonate minerals as new wildfire retardants, because they were shown to be more friendly to the environment (e.g., soil, ground, and underground water streams) than those currently in use (e.g., phosphate or sulfate salt type).

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Compositions and leaching behaviours of combustion residues

Cited by 71 publications

References 18 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

Characterization of air pollution control residues produced in a municipal solid waste incinerator in Portugal

Environmental benefits of using magnesium carbonate minerals as new wildfire retardants instead of commercially available, phosphate-based compounds

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