1 Ocak 2019 Dergi makalesi Açık Erişim

Fallahi, Y.; Aydin, A. A.; Gur, M.; Okutan, H.

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    <subfield code="a">The aim of this study was to examine the risk of heavy metal, ammonia and sulfate transition from underground coal gasification (UCG) chars and process water of Malkara lignite to the groundwater around the UCG cavity. The residues were collected during laboratory-scale underground coal gasification studies of Malkara lignite in ex situ gasification simulator. In order to compare gasification with combustion in terms of water pollution, ash samples were obtained by combustion of Malkara lignite. To determine the leaching behavior of the char and ash samples, two leaching tests (EPA TCLP and EN 12457-2 methods) were applied. The concentration of heavy metals in char, ash and process water samples was determined by ICP-OES. Additionally, ammonia and sulfate analyses were conducted for process water. Based on the results of this study, it has been found that the concentration of some elements, such as B, Sb and Al in char and ash eluates exceeded the maximum level of drinking water standards. However, there is no landfill concern about char samples according to EU Landfill Directive. A significant increase in B concentration was observed in ash samples. Considering B and some other elements combustion residues were identified with much higher water contamination ability, compared to gasification residues. Ammonia concentration was observed extremely high in process water of the gasification tests. UCG technique may be more environmentally applicable technology compared to combustion for Malkara lignite reserves. However, further detailed studies are necessary in the early stage of the UCG field test design and application.</subfield>
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    <subfield code="a">Fallahi, Y.</subfield>
    <subfield code="u">Istanbul Tech Univ, Dept Chem Engn, TR-34469 Istanbul, Turkey</subfield>
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    <subfield code="a">10.1007/s13762-018-1746-3</subfield>
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    <subfield code="a">Investigation of the pollution risk of residues from a laboratory-scale underground coal gasification of Malkara (Turkey) lignite</subfield>
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    <subfield code="a">Gur, M.</subfield>
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    <subfield code="a">Okutan, H.</subfield>
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