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- W2462404273 abstract "【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 2 S addition on the precipitation of heavy metals from the spent soil washing solution and thereby recycling of EDTA was investigated. Addition of Na 2 S into the single metal-EDTA and the mixed metal-EDTA solutions ([Na 2 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) 2 was subsequently added to induce further precipitation of Zn and Ni and to reduce the Na 2 S dose. At the [Na 2 S]/[metal-EDTA] ratio of 10, the removal efficiencies of all heavy metals excluding Ni were above 98% with the dose of Ca(OH) 2 at 0.002, 0.006 and 0.008 g into 100 mL of Cu-, Pb- and Zn-EDTA solutions, respectively. However, Ca(OH) 2 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.】" @default.
- W2462404273 created "2016-07-22" @default.
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- W2462404273 date "2015-01-01" @default.
- W2462404273 modified "2023-09-24" @default.
- W2462404273 title "Na2S를 이용한 EDTA 토양세척수로부터의 중금속 분리" @default.
- W2462404273 hasPublicationYear "2015" @default.
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