期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 405, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124226
关键词
Integrated remediation; Chromium; Soil and groundwater; Immobilization; Long-term stability
资金
- National Natural Science Foundation of China [21537002, 21777095, U1906225]
- National Key Research and Development Program of China [2018YFC1800601, 2018YFC1802701]
- China Major Science and Technology Program for Water Pollution Control and Treatment [2017ZX07204002]
The study successfully demonstrated that integrated technology can effectively remove Cr from contaminated groundwater and stabilize Cr in soil by using Fe-BC amended soil for remediation, removing about 71% of Cr and reducing leachability of Cr in soil by over 81%.
This study was aimed to prove the effectiveness and practicability of an integrated technology for simultaneous remediation of Cr-contaminated soil and groundwater. The remediation system was built by pumping Crcontaminated groundwater into top contaminated soil round after round, enabling the pre-applied iron-biochar composite (Fe-BC) in topsoil to stabilize Cr from both groundwater and soil. Immobilization ability and mechanism of Cr in soil were explored by toxicity characteristic leaching procedure test, scanning electron microscopy-elemental mapping, and X-ray photo spectroscopy. Hydrus-1D software was used to examine the long-term stability of immobilized Cr in soil. Results showed that Fe-BC-amended soil could remove about 71% Cr from contaminated groundwater. Meanwhile, Cr from both groundwater and soil was simultaneously immobilized in topsoil, leachability of Cr in which was reduced by over 81%. The immobilization of Cr in soil was attributed to the reduction of Cr(VI) into Cr(III) to form stable CrxFe(1-x)(OH)(3). After remediation, the average transport rate of Cr in the soil profile was only 0.420 cm y(-1) along with the local rainfall. Our study demonstrated that integrated technology could effectively remove Cr from groundwater and stabilize Cr in soil and the simultaneous remediation target for both soil and groundwater reached.
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