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Effects of leachant temperature and pH on leachability of metals from fly ash. A case study: Can thermal power plant, province of Canakkale, Turkey
Authors:Alper Baba  Gulbin Gurdal  Fatma Sengunalp  Ozgur Ozay
Institution:(1) Department of Geological Engineering, Canakkale Onsekiz Mart University, 17020 Canakkale, Turkey;(2) Can Vocational College, Canakkale Onsekiz Mart University, Can-Canakkale, Turkey
Abstract:Lignite powered electric generation plants result in increasing environmental problems associated with gaseous emissions and the disposal of ash residues. Especially, low quality coals with high ash content cause enormous quantities of both gaseous and solid fly ash emissions. The main problem is related to the disposal of fly ash, which, in many cases, contains heavy metals. It is known that toxic trace metals may leach when fly ash is in contact with water. In this study, fly ash samples obtained from the thermal power plant in the town of Can in Turkey were investigated for leachability of metals under different acidic and temperature conditions. The experimental results show that a decrease in pH of the leachant favors the extraction of metal ions from fly ash. A significant increase in the extraction of arsenic, cadmium, chromium, zinc, lead, mercury, and selenium ions from the ash is attributed to the instability of the mineral phases. These heavy metals concentrations increase with respect to increasing acidic conditions and temperature. Peak concentrations, in general, were found at around 30°C.
Keywords:Fly ash  Heavy metal concentrations  Leaching  Temperature and acidic conditions
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