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자료유형
학술저널
저자정보
오상화 (축산환경관리원) 신원식 (경북대학교 환경공학과)
저널정보
한국지하수토양환경학회 지하수토양환경 지하수토양환경 제20권 제7호
발행연도
2015.1
수록면
103 - 111 (9page)

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Soil washing with ethylenediaminetetraacetic acid (EDTA) is highly effective in the remediation of soils contaminated with heavy metals. The EDTA recycling process is a requisite for reducing the operating cost. The applicability of Na<sub>2</sub>S addition on the precipitation of heavy metals from the spent soil washing solution and thereby recycling of EDTA was investigated. Addition of Na<sub>2</sub>S into the single metal-EDTA and the mixed metal-EDTA solutions ([Na<sub>2</sub>S]/[metal-EDTA] ratio = 30, reaction time = 30 min and pH = 7~9) was highly effective in the separation of Cu and Pb from metal-EDTA complexes, but not for Ni. The Zn removal efficiency varied with pH and slightly increased upto 40% as the reaction time increased from 0 to 240 min which was longer than those for Cu and Pb. Ca(OH)<sub>2</sub> was subsequently added to induce further precipitation of Zn and Ni and to reduce the Na<sub>2</sub>S dose. At the [Na<sub>2</sub>S]/[metal-EDTA] ratio of 10, the removal efficiencies of all heavy metals excluding Ni were above 98% with the dose of Ca(OH)<sub>2</sub> at 0.002, 0.006 and 0.008 g into 100 mL of Cu-, Pb- and Zn-EDTA solutions, respectively. However, Ca(OH)<sub>2</sub> addition was not effective for Ni-EDTA solution. A further research is needed to improve metal removal efficiency and subsequent EDTA recycling for the real application in field-contaminated soils.

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