電動力對溴離子在含水層移動的影響

Effect of electrokinetic on the movement of Bromine in an aquifer

蔡昌賢(Chang-Hsien Tsai)

指導教授 ： 葉桂君

國立屏東科技大學/工學院/環境工程與科學系所/碩士(2016年)

摘要

目前有許多整治技術，例如最常見的土壤氣體抽除法（Soil Vapor Extraction, SVE）、空氣曝氣法（Air Sparging, AS）、化學氧化法（Chemical Oxidation）、生物復育法（Bioremediation）、還有電動力整治法（Electrokinetic remediation, EK）等其他整治技術。但在土壤及地下水整治的部分，在現地上常遇到低滲透性的地質，而導致該整治工法無法順利進行作業。因電動力法，可適用於飽和土壤層及不飽和土壤層，故選擇了電動力作實驗，以瞭解電動力對溴離子在含水層的移動是否有影響。
實驗中利用四口深約七公尺的標準監測井及一口簡易監測井，在不添加任何流質，施加電動力，經由三個實驗檢測出的溴離子濃度發現，雖然是由低水位往高水位的方向，溴離子還是能藉由電動力的牽引傳輸。
另外在相同的操作條件之下，經由實驗結觀察距離相差一公尺的監測井，同樣是高水位往低水位方向實驗結束時發現，陰極井的濃度相差了0.5倍，由此可證若距離增加，則可能須增加電壓或電流的大小、也可以增設監測井或增加電極的數量，使其傳輸效率更高。由此研究得知，電動力對於含水層溴離子的移動是有一定的影響力。

關鍵字

電動力 ； 水文流速 ； 溴離子 ； 整治

並列摘要

Nowadays, there are many remediation technologies such as Soil Vapor Extraction (SVE), Air Sparging (AS), Chemical Oxidation, Electrokinetic remediation (EK), and etc. The soil and groundwater remediation processes are often less effective in the aquifer of low permeabilty. The electrokinetic can be applied on both saturated and unsaturated subsurfaces. This study tested the movement of bromide ion in an aquifer under the influence of electrokinetic force.
Four 2-inch monitoring wells (depths of about seven meters) and one 1-inch well were installed. Bromine salt was added to one well and then electrokinetic was applied.
The results show that bromine ion appears in the monitor well one meter away from the injection well. Even though the direction of groundwater flow is perpendicular to the electrokinetic force, after applying the same operating conditions for twenty days, the concentration of bromine ion in the cathode wells is 50% higher than that in the anode. Therefore, it is concluded that electrokinetic still can enhance the movement of bromide ion even its movement direction is against the hydrological flow.
Higher voltage or current results in the increase of bromine movement. It is suggested that transmission efficiently can be further improved by installing more wells or electrode rods. This study proves that electrokinetic enhances the movement of Bromine in an aquifer.

並列關鍵字

electrokinetic ； groundwater flow ； bromine ion ； remediation

參考文獻

行政院環境保護署，2013，地下水水質監測井設置作業原則。

行政院環境保護署環境檢驗所，2010，監測井地下水採樣方法。

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