Abstract
A soil column leaching experiment was conducted to eliminate heavy metals from reclaimed tidal flat soil. Flue gas desulfurization (FGD) gypsum was used for leaching. The highest removal rates of Cd and Pb in the upper soil layers (0–30 cm) were 52.7 and 30.5 %, respectively. Most of the exchangeable and carbonate-bound Cd and Pb were removed. The optimum FGD gypsum application rate was 7.05 kg·m−2, and the optimum leaching water amount for the application was 217.74 L·m−2. The application of FGD gypsum (two times) and the extension of the leaching interval time to 20 days increased the heavy metal removal rate in the upper soil layers. The heavy metals desorbed from the upper soil layers were re-adsorbed and fixed in the 30–70 cm soil layers.
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We express our gratitude to the National Science and Technology Support Program of China (2012BAC07B05) for the financial support for the experiment. We also acknowledge the contributions of the reviewers of this manuscript.
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Responsible editor: Céline Guéguen
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Yang, P., Li, X., Tong, ZJ. et al. Use of flue gas desulfurization gypsum for leaching Cd and Pb in reclaimed tidal flat soil. Environ Sci Pollut Res 23, 7840–7848 (2016). https://doi.org/10.1007/s11356-016-6058-x
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DOI: https://doi.org/10.1007/s11356-016-6058-x