https://scholars.lib.ntu.edu.tw/handle/123456789/425160
標題: | Influences of thermal decontamination on mercury removal, soil properties, and repartitioning of coexisting heavy metals | 作者: | Huang, Yu Tuan ZENG-YEI HSEU HSING-CHENG HSI |
關鍵字: | Desorption | Metal fractionation | Soil characteristics | Thermogravimetry | 公開日期: | 1-八月-2011 | 出版社: | PERGAMON-ELSEVIER SCIENCE LTD | 卷: | 84 | 期: | 9 | 起(迄)頁: | 1244 | 來源出版物: | Chemosphere | 摘要: | Thermal treatment is a useful tool to remove Hg from contaminated soils. However, thermal treatment may greatly alter the soil properties and cause the coexisting contaminants, especially trace metals, to transform and repartition. The metal repartitioning may increase the difficulty in the subsequent process of a treatment train approach. In this study, three Hg-contaminated soils were thermally treated to evaluate the effects of treating temperature and duration on Hg removal. Thermogravimetric analysis was performed to project the suitable heating parameters for subsequent bench-scale fixed-bed operation. Results showed that thermal decontamination at temperature>400°C successfully lowered the Hg content to<20mgkg -1. The organic carbon content decreased by 0.06-0.11% and the change in soil particle size was less significant, even when the soils were thermally treated to 550°C. Soil clay minerals such as kaolinite were shown to be decomposed. Aggregates were observed on the surface of soil particles after the treatment. The heavy metals tended to transform into acid-extractable, organic-matter bound, and residual forms from the Fe/Mn oxide bound form. These results suggest that thermal treatment may markedly influence the effectiveness of subsequent decontamination methods, such as acid washing or solvent extraction. © 2011 Elsevier Ltd. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/425160 | ISSN: | 00456535 | DOI: | https://api.elsevier.com/content/abstract/scopus_id/79960846052 10.1016/j.chemosphere.2011.05.015 |
顯示於: | 環境工程學研究所 |
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