A specific configuration of circulation-enhanced electrokinetics (CEEK) to remediate real-site Cd and Pb contaminated soils

Jih-Hsing Chang; Yong-Li Wang; Shan-Yi Shen

doi:10.1016/j.jhazmat.2018.07.079

A specific configuration of circulation-enhanced electrokinetics (CEEK) to remediate real-site Cd and Pb contaminated soils

J Hazard Mater. 2018 Oct 5:359:408-413. doi: 10.1016/j.jhazmat.2018.07.079. Epub 2018 Jul 22.

Authors

Jih-Hsing Chang¹, Yong-Li Wang², Shan-Yi Shen³

Affiliations

¹ Department of Environmental Engineering and Management, Chaoyang University and Technology, 168, Jifong E. Rd., Wufong District, Taichung, 41349, Taiwan. Electronic address: changjh@cyut.edu.tw.
² Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong. Electronic address: aenguswang8@gmail.com.
³ Department of Environmental Engineering and Management, Chaoyang University and Technology, 168, Jifong E. Rd., Wufong District, Taichung, 41349, Taiwan. Electronic address: shanyi0226@gmail.com.

PMID: 30055430
DOI: 10.1016/j.jhazmat.2018.07.079

Abstract

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.

Keywords: CEEK; Electrokinetics; Heavy metals; Soil pollution.