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Stabilization of Cd-, Pb-, Cu- and Zn-contaminated calcareous agricultural soil using red mud: a field experiment |
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| Authors: | Wang Yangyang Li Fangfang Song Jian Xiao Ruiyang Luo Lin Yang Zhihui Chai Liyuan |
| Affiliation: | 1.Key Research Institute of Yellow River Civilization and Sustainable Development & Collaborative Innovation Center on Yellow River Civilization of Henan Province, Henan University, Kaifeng, 475004, China ;2.School of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China ;3.Institute of sustainable development in agriculture and rural area, Henan University, Kaifeng, 475004, Henan, China ;4.Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China ;5.Chinese National Engineering Research Centre for Control and Treatment of Heavy Metal Pollution, Changsha, 410083, China ; |
| Abstract: | Red mud (RM) was used to remediate heavy metal-contaminated soils. Experiments with two different dosages of RM added to soils were carried out in this study. It was found that soil pH increased 0.3 and 0.5 unit with the dosage of 3 and 5% (wt%), respectively. At the dosage of 5%, the highest stabilization efficiencies for Cd, Pb, Cu and Zn reached 67.95, 64.21, 43.73 and 63.73%, respectively. The addition of RM obviously transferred Cd from the exchangeable fraction to the residual fraction. Meanwhile, in comparison with the control (no RM added), it reduced 24.38, 49.20, 19.42 and 8.89% of Cd, Pb, Cu and Zn in wheat grains at the RM addition dosage of 5%, respectively. At the same time, the yield of wheat grains increased 17.81 and 24.66% at the RM addition dosage of 3 and 5%, respectively. Finally, the addition of RM did not change the soil bacterial community. These results indicate that RM has a great potential in stabilizing heavy metals in calcareous agricultural soils. |
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