The Study on the Removal of Mercury and Organomercury Contaminated Soil by Electrokinetic Processing

• Main Author: 廖世宏
• Other Authors: 顏溪成
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/23533692409898748590

碩士 === 國立臺灣大學 === 化學工程學研究所 === 84 === The electrokinetic processing is an emerging technology for in-situ soil decontarnination, which includes electroosmosis, electrolysis and electrophoresis. As electrodes are installed in wet soils, the anode pro- duces H+ ions, which moves toward the cathode in the electrical field. The pore fluid will be moved in the same direction by electroosmosis. Electroosmosis is an effective way which moves fluid through a fine- grained soil of low hydraulic conductivity. By electroosmosis and the action of an applied DC electric field, H+ ions flow into the soil specimen. The soil surface will adsorb the H+ ions and desorb Hg2+and CH3Hg+ ions. The Hg2+ and CH3Hg+ ions will move with the pore fluid and flow out of the soil specimen. Compared with other soil decontamination techniques, because the electrokinetic processing is an in-situ method, the decon- taminating steps can be simplified, and the soils will not be polluted again during the electrokinetic processing. In this study, The feasibility of removing mercury(Hg2+)or meth- ylmercury(CH3Hg+) ions from kaolinite specimen has been investigated. The pH and voltage profiles of the soil specimen and electroosmosis permeability were also deliberated. According to our data, the residual concentration percentage of mercury and methylmercury in kaolinite can be reduced to 10% or less.