請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/5794
標題: Tween-80對電動力法技術復育受三氯乙烯污染土壤之探討
Enhanced Recovery of Trichloroethylene from Soil by Tween-80 Surfactant Added in the Electrolyte of Electrokinetic Approach
作者: 葉孟翰
Yeh, Meng-Han
關鍵字: 三氯乙烯
Trichloroethylene
聚氧乙烯(20)山梨醇單油酸酯
電動力法復育
微胞
polyoxyethylene(20) sorbitan monooleate
Electrokinetic remediation
Micelle
出版社: 環境工程學系所
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摘要: 台灣過去二、三十年以來含氯有機溶劑在工業上被廣泛的使用,三氯乙烯為地下水和土壤中常見有機污染物之ㄧ。三氯乙烯比重大於1且難溶於水,屬於DNAPLs(Dense Nonaqueous-Phase Liquid),一旦處理不當洩漏於水體中,因重力或擴散而往地下水層移動,進而吸附於不飽和層土壤中,造成土壤嚴重污染。電動力法(Electrokinetics, EK)復育技術被美國環保署列為整治地下層DNAPLs 污染黏質土壤場址之可行技術之一。然而對於疏水性有機污染物,由於其水相溶解度較低,因此單獨以電動力技術處理之效果不佳。界面活性劑(surfactant)對於疏水性有機物具有高溶解度特性,本實驗將結合電動力法與界面活性劑之優點來處理受三氯乙烯污染之土壤。 本實驗主要探討界面活性劑於電動力法系統對於移除土壤中三氯乙烯之效能探討,使用非離子型界面活性劑Tween-80作為操作液;其特性為毒性較低、微生物可分解性及達零界微胞濃度(CMC)低。實驗將分成兩部分,添加不同濃度之電解質MgCl2於不同濃度之Tween-80溶液中,對於電動力復育三氯乙烯之效果。實驗結果,對照組單純只以0.005 M MgCl2作為操作液,移除率只有16.8 %;實驗組,在0.005 M MgCl2中添加50 mg/L之Tween-80溶液,移除率可達 36.8 %及在0.05 M MgCl2中添加50 mg/L之Tween-80溶液,移除率可達60.1 %。但將Tween-80濃度提高至100 mg/L,系統對於三氯乙烯的移除效率有所不同。當在0.005 MgCl2濃度電解質下,因100 mg/L之Tween-80對於高嶺土的吸附量會增加,阻塞了孔隙中液體的流動,造成移除率只有15.7 %。當使用0.05 MgCl2濃度電解質下,因為高電流驅使高電滲透流的移動,增加微胞於孔隙中的流動,而移開阻塞在孔隙中的高嶺土,進而將帶有污染物的孔隙水移出土壤,此組實驗的移除率為46.7 %。
The chlorinated organic solvents have been widely used in the industry in Taiwan for over the past two and three decades. Trichloroethylene is among the most ubiquitous chemicals found in groundwater and soil contaminants. Trichloroethylene’s properties is specific gravity greater than 1 and low solubility in water. It is a typical DNAPL(Dense Nonaqueous-Phase Liquid). When it is released into ground, it can be adsorbed in the unsaturated zone and migrated by gravity and diffusion into groundwater, causing subsurface pollution seriously. Electrokinetic (EK) remediation technology is recognized by the U. S. Environmental Protection Agency as one of the available techniques for remediation subsurface the DNAPLs pollution of clay soil site. For hydrophobic organic compounds is of the low solubility in water, therefore, the electrokinetic remove is not effective. The surface-active agent(surfactant) has the characteristics of high solubility of hydrophobic organic compounds. This study combined the advantages of electrokinetic and surfactant to remove contaminants of TCE from soil. In this study of adding surfactant in electrolyte to investigate the performance of trichlorethylene in the soil removal, using non-ionic surfactant Tween-80 as the operating fluid; the characteristics of which are low toxic, feasible for microbial decomposition and of low critical micelle concentration (CMC). The experiment will be divided into two parts, which are either different in concentrations of MgCl2 or in concentrations of Tween-80 solutions, for the electrokinetic effect of remediation trichloroethylene from soil. The results showed that the control group added only 0.005 M MgCl2 as the operating fluid, the removal rate was 16.8 %;Test 2 added 0.005 M MgCl2 in 50 mg/L Tween-80 solution, the removal rate was up to 36.8 % , and Test 3 added 0.05 M MgCl2 in 50 mg/L Tween-80 solution, the removal rate would be up to 60.1 % . When Tween-80 concentration increased to 100 mg/L, the removal efficiency of trichlorethylene is different. When the electrolyte concentration of MgCl2 was 0.005 M, the removal rate of only 15.7 %;the pore fluid could be blocked, because of the increasing adsorption capacity of soil while the concentrations of Tween-80 was 100 mg/L. When 0.05 M MgCl2 was used, the removal rate was 46.7 %;the quantity of electro-osmosis flow and the movement of micelles in the pore increased extremely by high current, leading to the moving of soil particales in the pore;and thus, drived the pore fluid with pollutants out of the soil.
URI: http://hdl.handle.net/11455/5794
其他識別: U0005-1907201214564500
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-1907201214564500
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