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  • Changes in speciation and leaching behaviors of heavy metals in dredged sediment solidified/stabilized with various materials

    Author(s)
    Bao, Jianping
    Wang, Liang
    Xiao, Man
    Griffith University Author(s)
    Xiao, Man
    Year published
    2016
    Metadata
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    Abstract
    Solidification/stabilization (S/S) of sediments is frequently used to treat contaminants in dredged sediments. In this study, sediment collected from the Pearl River Delta (China) was solidified/stabilized with three different kinds of functional materials: cement, lime and bentonite. Lime primarily acted via induced increases in pH, while cements stabilization occurred through their silicate-based systems and the main function of bentonite was adsorption. The speciation and leaching behaviors of specific heavy metals before and after S/S were analyzed and the results showed that the residual speciation of Cd, Cr, Ni, Pb and ...
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    Solidification/stabilization (S/S) of sediments is frequently used to treat contaminants in dredged sediments. In this study, sediment collected from the Pearl River Delta (China) was solidified/stabilized with three different kinds of functional materials: cement, lime and bentonite. Lime primarily acted via induced increases in pH, while cements stabilization occurred through their silicate-based systems and the main function of bentonite was adsorption. The speciation and leaching behaviors of specific heavy metals before and after S/S were analyzed and the results showed that the residual speciation of Cd, Cr, Ni, Pb and Zn increased in all treatments except for Cu, as the exchangeable speciation, carbonate-bound speciation and Fe-Mn-oxide-bound speciation of Cu (all of which could be stabilized) were less than 2 % of the total amount. Pb leaching only decreased when pH increased, while the mobility of Cr and Ni only decreased in response to the silicate-based systems. The leached portion of the Fe-Mn-oxide-bound speciation followed the order Zn > Cu > Ni/Cd > Pb > Cr. The leached portion of organic-matter-bound species was less than 4 % for Cd, Cr, Ni and Pb, but 35.1 % and 20.6 % for Cu and Zn, respectively.
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    Journal Title
    Environmental Science and Pollution Research
    Volume
    23
    Issue
    9
    DOI
    https://doi.org/10.1007/s11356-016-6184-5
    Subject
    Chemical sciences
    Environmental sciences
    Other environmental sciences not elsewhere classified
    Biological sciences
    Publication URI
    http://hdl.handle.net/10072/99946
    Collection
    • Journal articles

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