現地電解整治地下水氯乙烯污染之模場案例

現地電解整治工法為一新穎性技術，本研究整合太陽能供電系統與電解處理系統，開發綠色整治工法應用於地下水氯乙烯污染場址之整治。實驗室電解實驗使用白金電極，採定電壓3.0 V操作，氯乙烯移除效率最佳達100%，擬一階反應速率常數為0.041 min^(-1)。現地電解整治系統包括太陽能供電系統、電源控制單元、井中電極，模場試驗區域設有背景監測井、電解整治井、成效監測井。整治井中透過電解機制持續生成氫氧自由基及強氧化劑氧化污染物，或生成氫原子參與污染物還原反應。污染物藉由地下水傳輸進入整治井內，即可參與電化學觸發之氧化還原反應，進行污染物之破壞移除。若污染物於整治井內有足夠的滯留時間，自整治井流出之淨化地下水，即可藉由混合、延散、稀釋等作用逐步降低污染物的濃度，來達到地下水整治的目的。模場試驗場址地下水氯乙烯背景濃度0.14 mg/L，整治系統啟動後整治井氯乙烯濃度迅速降至地下水管制標準以下(not detectable, ND)，成效監測井氯乙烯濃度略有上下浮動，於整治系統操作1個月內亦降至地下水管制標準以下(ND值)。歷經4個月之現地電解整治期程，呈現模場試驗區域地下水無污染情況，顯現應用現地電解整治工法處理地下水氯乙烯污染的具體整治成效。

關鍵字

電解；太陽能；綠色整治；地下水整治；含氯污染場址

並列摘要

In-situ electrolysis remedy scheme is one of novel technologies today. This study integrated a solar energy power supply system with an electrolytic treatment system to implement the concept of green remediation. In-situ electrolysis remedy scheme was applied to a pollution control site for remediating vinyl chloride contaminated groundwater. The platinum electrodes were employed in lab electrolysis experiments, and the constant-potential operation was controlled at 3.0 V. The result of lab electrolysis experiments demonstrated the complete removal of vinyl chloride from groundwater and gave the pseudo first-order kinetic constant of 0.041 min^(-1). The in-situ electrolysis remediation system includes a solar energy power supply system, an energy control unit and the in-well electrode. A background monitoring well, an electrolytic remediation well and an efficiency monitoring well were established at the pilot study area. In the electrolytic remediation well, the OH radicals and strong oxidants were generated to oxidize contaminants, and the H atoms were generated as well to participate the reductive reaction of contaminants. Aqueous contaminants can migrate into the electrolytic remediation well by groundwater transport, and they subsequently join electrochemical-induced redox reactions for the final breakdown. If the retention of groundwater flow in the electrolytic remediation well is long enough, then the purified outflow can gradually reduce contaminant concentrations in the aquifer through the effect of groundwater mixing, dispersion and dilution. The background vinyl chloride concentration is 0.14 mg/L in the aquifer of pilot study area. Vinyl chloride concentration was immediately diminished in the electrolytic remediation well under system operation. Vinyl chloride concentration was fluctuated and finally lowered down to the undetected level after 1 month's operation of the in-situ electrolysis remediation system. Vinyl chloride was cleaned up in the aquifer of pilot study area after continual operation of the in-situ electrolysis remediation system for 4 months. The remediation efficiency is remarkable in this case, and in-situ electrolysis remediation method has successfully demonstrated its feasibility to clean up vinyl chloride contaminated groundwater.

並列關鍵字

electrolysis ； solar energy ； green remediation ； groundwater decontamination ； chlorinated compound contaminated site

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現地電解整治地下水氯乙烯污染之模場案例

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