Removal of heavy metals from contaminated paddy soils using chemical reductants coupled with dissolved organic carbon solutions

被引:42
作者
Chien, Shui-Wen Chang [1 ]
Wang, Hsiou-Hsuan [2 ]
Chen, Yueh-Min [3 ]
Wang, Ming-Kuang [4 ]
Liu, Cheng-Chung [5 ]
机构
[1] Chaoyang Univ Technol, Dept Environm Engn & Management, Taichung 41349, Taiwan
[2] Natl Ilan Univ, Dept Chem & Mat Engn, Ilan 26047, Taiwan
[3] Fujian Normal Univ, Coll Geog Sci, Fuzhou 350007, Peoples R China
[4] Natl Taiwan Univ, Dept Agr Chem, Taipei 10617, Taiwan
[5] Natl Ilan Univ, Dept Environm Engn, Ilan 26047, Taiwan
关键词
DOC; Fe oxide minerals; Ferrous sulfate; Reductive dissolution; Sodium dithionite; Soil washing;
D O I
10.1016/j.jhazmat.2020.123549
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
General acid washing is commonly used to treat heavy metal-contaminated soils, but it is sometimes difficult to achieve remediation aims in severely polluted soils. If we expose the surfaces of Fe oxide minerals to reductive dissolution during washing treatment, more of the metals initially adsorbed to these surfaces will be liberated, which may encourage the removal of heavy metals. Initially, the metal extraction capabilities of nine chemical reductants were compared in ten soil samples polluted by Cr, Cu, Zn, and Ni. Sodium dithionite (Na2S2O4) and ferrous sulfate (FeSO4) were screened for subsequent intensive research. In summary, the Na2S2O4 solutions had higher Cr, Cu, and Zn removal rates than either the FeSO4 or acid solution. Application of dissolved organic carbon (DOC) further increased the removal of heavy metals by complexation. About 15%, 86%, 32%, and 52% of the Cr, Cu, Zn, and Ni, respectively, were removed from the representative soil (M-2) by two-stage washing using 0.2 M Na2S2O4 coupled with 1,500 mg L-1 DOC solution at pH 2.0. Meanwhile, most soil fertility was preserved: ammonium nitrogen was increased 3.9 times; the increase in exchangeable potassium was 33%; and the reduction in available P was only 10%.
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页数:8
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