Field application of electrokinetic remediation for multi-metal contaminated paddy soil using two-dimensional electrode configuration |
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Authors: | Woo-Seung Kim Eun-Ki Jeon Ji-Min Jung Hong-Bae Jung Sung-Hwan Ko Chang-Il Seo Kitae Baek |
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Affiliation: | 1. Department of Soil and Groundwater, Korea Environment Corporation (KECO), 42 Hwangyeong-ro, Seo-gu, Incheon, 404-708, South Korea 2. Department of Environmental Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju, Jeollabuk-do, 561-756, South Korea 3. Ecophile, Yangjae, Seocho, Seoul, South Korea 4. Department of Bioactive Material Sciences, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju, Jeollabuk-do, 561-756, South Korea
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Abstract: | 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. |
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