Abstract
Solidification is a very effective way to alleviate heavy metal impacts to the environment. In this paper, an improved method was adopted herein for the solidification/stabilization (S/S) of sediments with cement-based additives and low content of cement in S/S materials. Sediments in Xiangjiang River, containing high concentrations of Cu, Cd, and Pb, were solidified/stabilized by binders of cement, fly ash, and bentonite. Admixtures such as sodium lignosulfonate, sodium lauryl sulfate, and triethanolamine were used to improve the bonding properties of S/S, which had never been investigated before. Results demonstrated that the addition of concrete admixtures had significant effects on the S/S of sediments. Sequential extraction method indicates that the concentrations of heavy metals changed significantly after solidification and were more stable over time, with the exception of Pb. In addition, SEM images indicated that the main hydrated product was ettringite. Large quantities of calcium silicate hydrates (CSH) formed and filled the solidified sediment in 60 days. The results provide further insights into the transformation of heavy metals during S/S.
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Acknowledgments
This study was financially supported by the National Natural Science Foundation of China (51178171, 51278176, 51378190, 51222805), the Program for Changjiang Scholars and Innovative Research Team in University (IRT-13R17), and the Hunan Provincial Innovation Foundation For Postgraduate (CX2016B134).
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Yan, M., Zeng, G., Li, X. et al. Incentive effect of bentonite and concrete admixtures on stabilization/solidification for heavy metal-polluted sediments of Xiangjiang River. Environ Sci Pollut Res 24, 892–901 (2017). https://doi.org/10.1007/s11356-016-7527-y
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DOI: https://doi.org/10.1007/s11356-016-7527-y