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Distribution of remaining Cd in MSWI fly ash washed with nitric acid

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Abstract

Municipal solid waste incineration (MSWI) fly ash is by-product and hazardous waste produced from MSWI plant. In the MSWI fly ash there are high contents heavy metals, among which cadmium (Cd) is more active and toxic. Although inorganic acid leaching is an effective way to remove heavy metals out from the MSWI fly ash and nitric acid has great efficiency for Cd removal, little literature reported the redistribution of remaining Cd in the MSWI fly ash. This investigation focused on the change of different factions (exchangeable, bound to carbonates, bound to Fe–Mn oxides, bound to organic matter and residual) of Cd in treated (i.e. washed with nitric acid) MSWI fly ash. Sequence extraction procedures (SEP) have been used to derive different fractions of Cd, results indicated that fractions of Cd have changed significantly after nitric acid washing procedures. Due to the changes of main compounds and microstructures stable Cd (bound to organic matter and residual) had opportunity to leach out, which resulted in a higher potential risk (or higher bioavailability index) for living creatures, although the total amount of Cd decreased. X-ray diffraction (XRD) and images of scanning electron microscope (SEM) proved these changes in washed MSWI fly ash.

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Authors and Affiliations

  1. College of Resources and Environmental Science, Chongqing University, Shazhengjie 174, Shapingba, Chongqing, 400044, People’s Republic of China

    Xue Zhao, Li-ao Wang & Lei Wang

  2. State Key Laboratory of Coal and Disaster and Control, Chongqing University, Shazhengjie 174, Shapingba, Chongqing, 400044, People’s Republic of China

    Li-ao Wang

  3. School of Information Science and Technology, Tsinghua University, Shuangqinglu 30, Haidian, Beijing, 100084, People’s Republic of China

    Wei Zhang

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  1. Xue Zhao
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  2. Li-ao Wang
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  3. Lei Wang
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  4. Wei Zhang
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Correspondence to Xue Zhao.

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Zhao, X., Wang, La., Wang, L. et al. Distribution of remaining Cd in MSWI fly ash washed with nitric acid. J Mater Cycles Waste Manag 19, 1415–1422 (2017). https://doi.org/10.1007/s10163-016-0535-7

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  • DOI: https://doi.org/10.1007/s10163-016-0535-7

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