以電化學法輔以陽離子交換膜去除受鉛汙染之土壤

The Electrochemical Removal of Lead in Contaminated Soils by Using Cation Exchange Membranes

周偉龍(Wei-Lung Chou) ； 吳永富(Yong-Fu Wu) ； 顏溪成(Shi-Chern Yen)

《弘光學報》 38期 (2001/11) Pp. 77-82

https://doi.org/10.6615/HAR.200111.38.10

摘要

應用電動力學去除土壤的汙染物具有相當潛力解決土壤問題，造成重金屬土壤去除效果不彰的最關鍵因素要算是沉澱物的形成。沉澱物的生長不但會降低汙染物的移動力，且會提高流體阻力，甚至阻塞孔洞，對整個程序而言是最大的不利因素。在本研究中為了解決這個問題，提出了一種包含水力、電力和外加陽離子交換膜的電化學整治法。吾人採取方式是阻絕法，及是放置一種半透膜在土壤試體與陰極之間以隔絕OH^-的反擴散。這種半透膜僅能讓陽離子通過，因此稱為陽離子交換膜。在採取上述措施後，受鉛汙染的土壤試體將不會有沉澱反應發生，而汙染物的流出英教順利，去除效率則更明顯的提高。對使用陽離子交換膜者，在20天內施加2.5 V/cm的電場可去除約90%以上的Pb。證明電化學方法結合陽離子交換膜在土壤汙染防治方面確為可發展的一項技術。

關鍵字

電化學整治:鉛 ； 土壤汙染 ； 陽離子交換膜

並列摘要

The feasibility of the electro-treatment for soils decontaminated by heavy metals would be promising and effective. As the electric field is applied, H and OH are generated from anode and cathode, respectively. The OH will give rise to the immobilization of heavy metals and results in the non-uniform distribution of the electric potential as well as low removal efficiencies. Therefore, the cation exchange membranes are used to interrupted OH and conducted to avoid the back-migration of the OH generated at the cathode. The experimental results indicate that this enhancement can raise the removal fractions effectively and those by using cation exchange membranes can reach 90% and more after only 20-days treatment.

並列關鍵字

Electrochemical remediation ； Lead ； Soil contamination ； Cation exchange membrane

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