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J Hazard Mater. 2019 Apr 15;368:894-898. doi: 10.1016/j.jhazmat.2018.08.085. Epub 2018 Aug 28.

The lead contaminated land treated by the circulation-enhanced electrokinetics and phytoremediation in field scale.

Author information

1
Department of Environmental Engineering and Management, Chaoyang University of Technology, Wufong 41349, Taiwan.
2
Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 81157, Taiwan.
3
Department of Environmental Engineering and Management, Chaoyang University of Technology, Wufong 41349, Taiwan. Electronic address: shanyi0226@gmail.com.

Abstract

Some agricultural lands have been contaminated by heavy metals in Taiwan for several decades, because the irrigation system was polluted by wastewater. In this study, a circulation-enhanced electrokinetics (CEEK) and phytoremediation were applied alternately to the real lead-contaminated site. In the beginning, the CEEK was used; then, the corn plants were raised. After this phytoremediation, the CEEK was employed again. Experimental results show that the lead concentration can be reduced from 5672 mg/kg to 2083 mg/kg (around 63%) after the three-stage treatment (CEEK + corn + CEEK). At each stage, CEEK, corn plants, and CEEK can remove around 25%, 5%, and 30% lead from the soil, respectively. During the whole process, the soil pH can maintain around neutral range and the electrical conductivity of soil was stable. The electricity consumption of the CEEK was quite low (89 USD per ton) and the corn plants still were alive throughout the remediation.

KEYWORDS:

Contaminated soils; Electrokinetics; Heavy metals; Phytoremediation

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