Prevention of lead leaching from fly ashes by mechanochemical treatment |
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| Authors: | Y Nomura K Fujiwara A Terada S Nakai M Hosomi |
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| Institution: | 1. Department of Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka, Koganei, Tokyo 184-8588, Japan;2. Engineering Department Fuji Oil Co., Ltd., 1 Sumiyoshi-cho, Izumisano, Osaka 598-8540, Japan;3. Department of Chemical Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan;1. Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China;2. Department of Materials Science and Engineering, The University of Sheffield, Sir Robert Hadfield Building, Mappin St, Sheffield, S1 3JD, United Kingdom;3. Geological Environment Division, Korea Institute of Geoscience and Mineral Resources, Gwahak-ro 124, Yuseong-gu, Daejeon, 34132, Republic of Korea;4. School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, Guangdong Province, China;5. College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China;6. State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai, China;1. Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand;2. Centre of Excellence in Geotechnical and Geoenvironmental Engineering, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand;3. Research Program: Sustainable Management of Industrial and Agricultural Wastes for Transitioning to a Circular Economy, Center of Excellence on Hazardous Substance Management (HSM), Bangkok, Thailand;4. Research Program of Industrial Waste Management – Policies and Practices, Center of Excellence on Hazardous Substance Management (HSM), Bangkok, Thailand;5. Research Network of NANOTEC – CU on Environment, Bangkok 10330, Thailand;1. Department of Biological Geological and Environmental Sciences, University of Bologna, Bologna, Italy;2. VTT Technical Research Centre of Finland Ltd, Espoo, Finland;3. Aalto University, School of Chemical Technology, Espoo, Finland;1. Department of Environmental Science and Engineering, Shanghai University, Shanghai 200444, China;2. Shanghai Institute of Geological Survey, Shanghai 200072, China |
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| Abstract: | Fly ashes from a municipal solid waste incinerator were subjected to mechanochemical (MC) treatment in a planetary ball mill, and the treated fly ashes were cemented with a binder. The leachability of lead (Pb) from the treated fly ashes and from the cement product were investigated, and the speciation of lead in the treated and untreated ashes was determined by X-ray absorption fine structure (XAFS) analysis. MC treatment of the fly ashes and subsequent cementation prevented Pb leaching by 99.9%, whereas MC treatment alone prevented Pb leaching by 92.8%. Analysis of the X-ray absorption near-edge spectrum of the untreated fly ashes revealed that the predominant Pb species in the ashes was PbCl2. In contrast, the counterpart in the treated fly ashes was Pb3O4 insoluble in water. The formation of a species of Pb with a lower solubility in water than that of PbCl2 was confirmed by MC treatment of PbCl2-spiked fly ashes for 48 h, indicating the reduction of PbCl2 in the spiked fly ashes to Pb via Pb3O4 during MC treatment. Our results indicate that such reduction to an insoluble species prevented Pb from leaching and that MC treatment followed by cementation is a feasible method for the recycling of fly ashes. |
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