Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 359, Issue -, Pages 408-413Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2018.07.079
Keywords
CEEK; Electrokinetics; Heavy metals; Soil pollution
Categories
Funding
- Environmental Protection Administration
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This study applied circulation-enhanced electrokinetics (CEEK) technique to remove Cd and Pb from the real-site contaminated soils. Soil samples were collected in certain polluted agricultural land in Yunlin, Taiwan. The CEEK system mainly composed of a reactor fulfilling soil samples, one pair of electrodes, a circulation system of working solution and DC power supply. Results demonstrate that the real-site Cd and Pb contaminated soils can be effectively treated by the CEEK technique; the removal efficiency of Cd and Pb can reach 91% and 85%, respectively. The CEEK system can maintain relatively neutral pH of treated soils. The bonding patterns of heavy metals and H+ produced on the anode play the critical roles for removal efficiency. The recovery efficiency of Cd and Pb in the CEEK system can reach 85% and 70%; the species of recovered heavy metals is Cd(OH)(2) and Pb5O8, respectively.
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