以電化學法加速整治受鉛污染土壤之研究

Enhanced Removal of Lead From Contaminated Soils by Electrochemical Treatment

周偉龍(Wei-Lung Chou) ； 劉惠銘(Hui-Ming Liu)

《弘光學報》 42期 (2003/11) Pp. 137-144

https://doi.org/10.6615/HAR.200311.42.15

摘要

本研究選擇鉛為污染物，探討在外加電場、水位梯度、緩衝溶液及置放陽離子交換膜的操作條件下，提出了一種包含水力、電力與化學作用的電化學整治法。在單純施加電場下，去除效率仍不彰之因可歸咎於非線性之pH值分布與沉澱物的形成，而解決之關鍵在於陰極pH值的控制。故吾人提出兩種方法，一是阻絕OH-進入試體之路，一是OH-消耗之量。對於前者可以採用陽離子交換膜，後者則可用緩衝溶液，而這兩種方法也顯示了相當不錯的效果。尤其對使用陽離子交換膜者，在20天內施加電場可以使土壤中含鉛殘留量僅剩下10%或更低的比率。證明這種綜合性的電化學處理方法在土壤污染防治方面確為可發展的一項技術。

關鍵字

鉛 ； 電化學整治 ； 土壤污染 ； 陽離子交換膜 ； 緩衝溶液

並列摘要

In this study, lead (Pb) was selected to be the contaminant. The feasibility of the electrochemical treatment for soils contaminated by heavy metals would be promising and effective. The OH will give rise to the immobilization of heavy metals and result in the non-uniform distribution of the electric potential as well as low removal efficiencies. Therefore, the buffer solution and cation exchange membranes were used to consume and interrupte OH , respectively. Thus, the enhancement by using buffer solutions or cation exchange membrane was conducted to avoid the back-migration of the OH generated at the cathode. According to our experimental results, the residual concentration percentage can be reduced to 10% or less after 20-days of treatment by using cation exchange membrane. The results also indicate that high removal efficiencies can be achieved with these enhancements and the feasibility of electrochemical -treatment for soils contaminated by lead has been proven.

並列關鍵字

Lead ； Electrochemical remediation ； Soil contamination ； Cation exchange membrane ； Buffer solution

參考文獻

廖世宏(1996).”以電動力學處理受汞與有機汞污染土壤中之研究”，國立台灣大學化學工程研究所碩士論文，台灣台北。

林伯宣(1998).”以電動力學處理受鎘污染土壤中之研究”，國立台灣大學化學工程研究所碩士論文，台灣台北。

周偉龍、吳永富、顏溪成，”以電化學法輔以陽離子交換膜去除酈舀污染之土壤”，弘光學報，Volume 38, (2001),77-82。

Acar, Y. B. and Haider, L., " Transport of low-concentration contaminants in saturated earthen barriers, " Journal of Geotechnical Engineering v 116, n 7, (1990), 1031-1052.

Acar, Y. B., Li, H. and Gale, R. J., " Phenol removal from kaolinite by electrokinetics, " Journal of Geotechnical Engineering v 118, n11, (1992), 1837-1852.