Field application of electrokinetic remediation for multi-metal contaminated paddy soil using two-dimensional electrode configuration

作者：Kim Woo Seung; Jeon Eun Ki; Jung Ji Min; Jung Hong Bae; Ko Sung Hwan; Seo Chang Il; Baek Kitae^*

来源：Environmental Science and Pollution Research, 2014, 21(6): 4482-4491.

DOI：10.1007/s11356-013-2424-0

• Paddy soil
• Field applicatio
• Electrolyte-conditioning
• Sequential extraction
• Fractionation

In this study, we evaluated the feasibility of in situ electrokinetic remediation for arsenic (As)-, copper (Cu)-, and lead (Pb)-contaminated soil, in a pilot-scale field application with two-dimensional electrode configurations. Square and hexagonal configurations with different electrode spacing, 1 m and 2 m, were investigated under a constant 100 V. A square configuration with electrode spacing of 2 m removed 61.5 % of As, 11.4 % of Cu, and 0.9 % of Pb, respectively, and a hexagonal configuration with the same spacing showed a higher removal efficiency in top (59 % of As, 0-0.5 m) and middle (53 % of As, 0.5-1.0 m) layers, but much lower removal efficiency in the bottom layer (1-1.5 m), which was thought to be due to groundwater flow through periodic rise and fall of tides. Fractionation analysis showed that As bound to Fe-Mn oxyhydroxide was the main form of As removed by the electrokinetic process. The two-dimensional configuration wasted less electrical energy by Joule heating, and required fewer electrode installations, compared to the one-dimensional electrode configuration.

• 出版日期2014-3