Removal of arsenic in tailings by soil flushing and the remediation process monitoring |
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| Authors: | Sang-Woo Lee Ju-Yong Kim Jong-Un Lee IlWon Ko Kyoung-Woong Kim |
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| Affiliation: | (1) Department of Environmental Science and Engineering, Kwangju Institute of Science and Technology (K-JIST), 1 Oryong-dong Puk-gu, 500-712, Kwangju, Korea;(2) Department of Civil, Geosystem and Environmental Engineering, Chonnam National University, 300 youngbong-dong, Puk-gu, 500-757, Gwangju, Korea |
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| Abstract: | In order to investigate the optimum conditions for the application of soil flushing of arsenic, a batch test was carried out using EDTA at various concentration and pH levels. Based on the optimum condition derived from the batch test, a column test was conducted to examine the feasibility of the soil-flushing technology under field-equivalent conditions. In this column test, a low flushing solution flow rate showed a significantly higher As removal efficiency (71.6%) than a high flow rate (56.3%). TCLP (toxicity characteristic leaching procedure) and a seed germination test were carried out to monitor the toxicity both during and after the treatment. The finally treated tailings were shown to be significantly remediated, having a reduced toxicity by both the TCLP and seed germination tests. |
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| Keywords: | arsenic EDTA seed germination soil flushing TCLP toxicity |
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