Abstract
A supernatant solution, obtained after immobilization of heavy metals involved in fly ashes by a solution of sulfur and calcium hydroxide, was re-used for immobilization of heavy metals and decomposition of asbestos in construction materials. Asbestos was decomposed to more than 99.9 % by mixing it with the supernatant in a ball mill at room temperature. The decomposition of asbestos was confirmed by X-ray diffraction (XRD), a phase contrast microscope after staining the asbestos with solutions of different diffractive indexes and a scanning electron microscope. XRD indicated complete disappearance of specific main peaks of asbestos: chrysotile, crocidolite, amosite and tremolite. Heavy metals such as chromium(VI) and lead(II) in fly ashes were completely immobilized by the supernatant. It is the first time that a solution obtained after the treatment of wasted fly ash is recycled for decomposition of hazardous waste materials such as asbestos.
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Acknowledgments
The authors appreciate the support of Environment Research and Technology Development Fund of Ministry of the Environment, Japan (3K143011). The authors also thank the support of a Grant-in Aid Scientific Research (C), 24550103 from Japan Society for Promotion of Science.
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Tabata, M., Shono, A. & Ghaffar, A. Decomposition of asbestos by a supernatant used for immobilization of heavy metals in fly ash. J Mater Cycles Waste Manag 18, 483–492 (2016). https://doi.org/10.1007/s10163-016-0491-2
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DOI: https://doi.org/10.1007/s10163-016-0491-2