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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/29368


    Title: 現地電解整治氯烯類地下水污染之案例探討
    其他題名: Case Study on Groundwater Clean up of Chlorinated Compounds by In-situ Electrolysis
    Authors: 林家煇
    Lin, Chia-Hui
    指導教授: 吳庭年
    Wu, Ting-Nien
    Keywords: 三氯乙烯;電解;雙相抽除法;抽出處理法;地下水整治
    TCE;electrolysis;DPE;pump and treat;groundwater cleanup
    Date: 2018
    Issue Date: 2018-11-13 11:20:31 (UTC+8)
    Abstract: 本研究批次實驗與連續流實驗分別以不同實驗變因控制,進行三氯乙烯污染地下水之電解實驗,以評估最佳的電解操作條件。於某處地下水三氯乙烯與二氯乙烯污染之整治場址,現場安裝10支井中電極運行現地電解整治工法,併同雙相抽除法(DPE)與地下水抽出處理法之運作,整治地下水三氯乙烯與二氯乙烯等污染物,並估算各整治工法之污染移除量貢獻。 實驗室三氯乙烯電解實驗使用白金電極作為工作電極,分別進行批次實驗和連續流實驗,以不同操作電壓電解探討不同的操作條件對三氯乙烯之降解效果。批次實驗以操作電壓1.2V、1.5V、2.0V、2.5V、3.0V,電解2小時後三氯乙烯污染水樣之去除率分別為32.8%、40.5%、63.7%、76.1%以及>99.9%。實驗結果發現三氯乙烯去除效率隨電壓提升而增加,使用白金電極以操作電壓3.0V可將水樣中三氯乙烯完全去除。 連續流實驗設定循環流速為600 ml/hr、1200 ml/hr、2400 ml/hr及3600 ml/hr,以模擬地下水流動之情況,所有連續流實驗皆以操作電壓3.0V進行電解實驗。實驗結果得知反應器中水樣皆無法達到三氯乙烯與二氯乙烯完全去除的情況,以循環流速600 ml/hr實驗組的污染去除效果最佳,去除三氯乙烯之擬一階反應速率常數為0.0132 〖min〗^(-1),順1,2二氯乙烯則為0.0065〖min〗^(-1)。由實驗結果得知,擬一階反應速率常數隨循環流速加大而減少。 假設在相同的電解操作條件,污染物電解去除量與工作電極表面積成正比,依據批次電解實驗的擬一階反應速率常數,估算井中電極的工作效率,電極表面積1〖cm〗^2可去除3.29×〖10〗^(-3) mg-TCE/〖cm〗^2-hr與5.27×〖10〗^(-3) mg-DCE/〖cm〗^2-hr。 現場整治工法之改善效率評估期間由2016年12月至2017年5月,本階段地下水抽出處理法經推算後估計自地下水移除4,539.5 g-TCE與34,785 g-DCE;現場DPE以抽氣量及尾氣濃度計算估計約移除8,071.6 g之污染物,以抽水量及水樣濃度計算估計約移除366.5 g-TCE and 330 g-DCE。而現地電解整治工法以井中電極工作效率估算,本階段自地下水去除之污染物量約968 g,佔現場整治工法合計之污染移除量49,060 g僅約2 %。
    In this study, TCE-contaminated groundwater samples were electrolyzed under different controls in a bath reactor and a continuous-flow reactor to evaluate the optimum control of electrolysis. With the combination of dual phase extraction (DPE) and pump & treat methods, the in-situ electrolysis system including 10 installed electrodes were employed to clean up TCE and DCE contaminated groundwater at one groundwater remediation site. The contribution of contaminant removals by each remediation scheme was estimated.The Pt electrode was employed as working electrode to conduct TCE electrolysis experiments. The removals of TCE were examined under various potential controls in the batch reactor as well as in the continuous-flow reactor. The results of batch electrolysis experiments showed that removal efficiencies are 32.8%, 40.5%, 63.7%, 76.1% and >99.9% after electrolyzing 2 hour at 1.2 V, 1.5 V, 2.0 V, 2.5V and 3.0 V, respectively. Removal efficiencies of TCE were increasing with control potentials. The complete removal of TCE can be attained at 3.0 V in the Pt- electrolytic system.Continuous flows were set at 600 ml/hr, 1200 ml/hr, 2400 ml/hr and 3600 ml/hr to simulate different levels of groundwater flow, and the electrolyzing potentials were operated at 3.0 V in all continuous-flow electrolysis experiments. The results of continuous-flow electrolysis experiments showed that the complete removal of TCE and DCE cannot be reached. The pseudo first-order kinetic rate constants are 0.0132 min-1 for TCE and 0.0065 min-1 for DCE with the continuous flow rate of 600 ml/hr. The pseudo first-order kinetic rate constants were decreasing with the rise of continuous flow rates.Under the identical control of electrolysis, the removal of contaminants was assumed to proportion to surface area of the working electrode. Thus, one in-well electrode was estimated to remove 3.29×〖10〗^(-3)mg-TCE/〖cm〗^2-hr and 5.27×〖10〗^(-3) mg-DCE/〖cm〗^2-hr based on the pseudo first-order kinetic rate constants of batch experiments. On-site removal efficiencies of TCE and DCE were examined during the period of December 2016 and November 2017. The pump & treat method removed about 4,539.5 g-TCE and 34,785 g-DCE from groundwater. The DPE method removed about 8,071.6 g from gaseous vapor and about 366.5 g-TCE and 330 g-DCE from groundwater. In-situ electrolysis method destructed about 968 g groundwater contaminants, which only contributed about 2% of total removals (49,060 g) by all on site remediation schemes.
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