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題名 | 以電滲透法整治受鎘污染之土壤=The Remediation of Cadmium-Contaminated Soils by the Electro-osmosis |
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作者 | 吳永富; 周偉龍; 顏溪成; Wu, Yong-fu; Chou, Wei-lung; Yen, Shi-chern; |
期刊 | 弘光學報 |
出版日期 | 20000400 |
卷期 | 35 2000.04[民89.04] |
頁次 | 頁239-250 |
分類號 | 445.6 |
語文 | chi |
關鍵詞 | 電滲透; 鎘; 高嶺土; Electroosmosis; Cadmium; Kaolinite; |
中文摘要 | 電動力學處理受污染的土壤之主要機制包含電滲透作用與電解反應,而 陽極於電解反應所產生的氫離子更為去除土壤表面所吸附重金屬的關鍵。當一個 電場施加於土壤中,陽離子會在其作用下逐漸往陰極方向移動,且土壤孔洞中的 流體亦會引發電滲透流,其流向主要決定於環境的pH值,pH較高的環境下產生 的電滲透流為往陰極方向;在pH較低的環境則是往陽極方向流動。本研究選擇鎘 為汙染物,探討在低水位梯度,定電壓操作下的重金屬去除效果。從實驗結果發 現無論是正向或是逆向電滲透流,均有去除重金屬污染的能力。另外我們也觀察 到在較高pH值之下所產生的沉澱物並非集中在陰極土壤中,而是阻塞在試體與 陰極室交接處。而我們亦將討論置放陽離子交換膜、通電時間及電極距離對去除 效率造成的影響。在電滲透流的作用下鎘的清除效率相當高,越接近陽極殘留量 越低約在5以下,證明電動力學在土壤污染防治方面確為可發展的一項技術。 |
英文摘要 | Electrokinetic processing has been used in the soil remediation with the mechanisms: electroosmosis and electrolysis. The H- ion produced from the anodic electrolysis is the key to remove the heavy metals adsorbed on the soilsurface. When an electrical field is applied, the cat ion moves toward the cathode and the electroosmosis is induced in the porous medium. The direction ofelectroosmotic flow depends on the pH of pore fluid. A higher pHcauses the pore fluid moving to the cathode, but a lower pH results in anopposite flow. In this study, cadmium was selected to be the contaminant forstudying the remediation in the low hydraulic and constant applied voltagesituation. It was found that the electroosmotic flow could remove heavymetals from the kaolinite. We also found that the precipitates generated in asolution with high pH did not concentrate in the specimen near the cathode, but accumulated between the soil specimen and the cathode room. Furthermore, the feasibility of removing cadmium from kaolinite specimen has been investigated. According to our experiments, the residual concentration percentage can be reduced to 5 or less. |
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