Effects of Washing Solution, Washing Time, and Solid-Solution Rate on the Maximum Heavy Metals Removal Efficiency
نویسندگان
چکیده
In Korea, for heavy metal-contaminated soil, there are insufficient basic data as well field application cases soil washing. This study was conducted to suggest the significant factors and optimal operation conditions maximum metal removal efficiency. Five types of washing solution [acid (HCl), citric acid, oxalic EDTA, CaCl2], time (10–360 min), solid-solution ratio (1:2–1:100) were selected operational factors. Non-observed effect concentration (NOEC) central composite rotatable design (CCRD) applied derive conditions. The pH slightly alkali, it highly contaminated by Cd (17.34 mg kg−1), Cu (307.76 Pb (714.78 Zn (1755.47 complexly. For all metals, CaCl2, a neutral salt, difficult achieve remediation goal. On other hand, Cd, Cu, removed successfully from acid solution, EDTA. Zn, only could meet goal (300 kg−1). As increased, efficiency showed tendency increase overall. Especially, able reach highest point within 30 min, whereas EDTA took 2 4 h at longest. case 1 M through CCRD experiment, (solid-solution time) be deduced each metal. Furthermore, this series processes can utilized useful tool find operating and, same time,
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ژورنال
عنوان ژورنال: Applied sciences
سال: 2021
ISSN: ['2076-3417']
DOI: https://doi.org/10.3390/app11146398