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Risk assessment of bottom ash from fuel oil power plant of Italy: mineralogical, chemical and leaching characterization

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Abstract

The main aim of the present study is to contribute to the field of environmental research by providing new data on bottom ash samples derived from an oil power plant located in Southern Italy. To achieve this purpose, the mineralogical and chemical properties of representative bottom ash samples were investigated through the integrated employment of different analytical techniques, i.e., X-ray powder diffraction, scanning electron microscopy, X-ray fluorescence and atomic absorption spectrometry. The obtained experimental results show that quartz, alunogen, rhomboclase and potassium hydrogen silicate are the major crystalline phases of all the analyzed samples. Furthermore, the revealed main ash constituents are SiO2 and SO3, with low contents of Fe2O3 and Al2O3, and little amounts of CaO, Na2O, K2O, MgO, P2O5 and TiO2. Among the trace elements, very high amounts of heavy metals, i.e., V, Cr, Ni, La, Pb and Mo, were detected. The comparison of the obtained heavy metal abundance data with those reported in the literature highlights significant differences. Leaching test evidenced V, Ni and Cr values that make these ashes a potential contamination source for groundwater quality and for soil, nearby the ash disposal landfills area. All the obtained findings show that these materials are highly harmful for the human health, with a greater extent for the heavy metal concentrations.

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Di Bella, M., Italiano, F., Magazù, S. et al. Risk assessment of bottom ash from fuel oil power plant of Italy: mineralogical, chemical and leaching characterization. Environ Earth Sci 77, 217 (2018). https://doi.org/10.1007/s12665-018-7388-4

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