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The Influence of YataÄŸan Power Plant Ashes on the Properties of Nearby Soils

Coal-fired power plants are used to meet the energy need of the country. However, fly and bottom ash originate as combustion residues from these plants. The amount of each residue depends on the power plant configuration and on the emission control device used at the plant

Depending on the coal quality, the ash produced in a power plant consists generally of 25 % bottom ash and 75 % of fly ash. The ash can be utilized in the construction industry as admixtures in cement and concrete, making bricks and other ceramic products. However, only a portion of ash is usually used commercially and the remainder is discarded in landfills or in coal mines. Yatağan power plant (3 x 210 MW) is the oldest among the three power plants constructed at the beginning of the eithies (1982 - 1984) in the vicinity of Muğla to meet the energy need of Turkey. The coal used in the plants is low quality lignite originating from the reserves of Yatağan- Eskihisar, Tınaz, and Bağyaka basins. The Yatağan plant is known to use 15,000 tons of coal (28 - 35 % ash, 1.1 - 2.1 sulphur) and to discharge 5,000 tons of ash daily. The ashes are transported via conveyor belts to the disposal site where they are disposed. The Yatağan power plant is situated in the Yatağan plain, which is located in the Aegean Region near the Muğla city. As reported by Baba (2001) a large part of the Yatağan Plain is formed by alluvium, which is the principal aquifer in front of waste disposal site. The alluvium consists of loose, interlayer red clay, silt, sand, and gravel. According to these investigations the alluvium aquifer was found to be very permeable. Fourteen soil samples from sites located along the dominant wind direction were analysed for their physicochemical properties according to standard procedures. In general, the soil was sandy varying in fine, medium and coarse sand fractions. The pH of soil samples was varying between 7.2 and 7.5. The reference pH value was determined to be 7.3 and the pH of bottom ash and fly ash was measured to be 11.3 and 9.6, respectively. Thus, it can be concluded that the soil pH was not significantly influenced. The heavy metal levels of samples were strongly variable, changing from 11 to 300 mg Ni kg^-1 for nickel, 0 to 37 mg Pb kg^-1 for lead, 0 to 97 mg Cu kg^-1 for copper, 21 to 142 mg Zn kg-1 for zinc and 0 to 1 mg Cd kg^-1 for cadmium. According to the Turkish Bylaw on Controlling Soil Pollution and Point-Source Polluted Fields, reference values are used in order to determine whether a field was influenced by any point source activity. Reference values are measured on soil samples taken from any field at vicinity of suspicious area, which is thought not to be polluted by point source or human activity. Accordingly, two sites were selected as reference sites within the study. The deviation (S) from the reference value is evaluated with a kind of enrichment factor calculated simply by dividing the maximum measured value of examined soil sample (OD_max) by the reference value (RD) (S = OD_max/RD).

Copyright:	© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben
Quelle:	Depotech 2012 (November 2012)
Seiten:	1
Preis:	€ 0,00
Autor:	E. B. Özkaraova Güngör
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