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  • 學位論文

在不同水質參數下利用氧化銅活化過二硫酸鹽降解氯酚類有機污染物:透水性反應牆模組試驗

Degradation of Chlorophenols under Different Water Matrixes by CuO-Activated Peroxydisulfate in Permeable Reactive Barrier Module

指導教授 : 林逸彬

摘要


地下水污染整治一直以來都是維持永續水資源的重要課題,利用現地的方式處理地下水污染是較經濟且對環境較友善的方法。透水性反應牆(permeable reactive barrier, PRB)和現地化學氧化 (In-situ chemical oxidation, ISCO)為現地處理地下水污染的方法。本研究使用氧化銅(CuO)作為透水性反應牆之反應介質,結合過二硫酸鹽作為氧化劑,以現地透水性反應牆化學氧化方式評估在固定流量條件下,2,4-二氯酚、2,4,6-三氯酚及五氯酚的降解效率,並探討不同水質參數包含氯離子、硝酸根、硫酸根、碳酸氫根及腐植酸對五氯酚去除率的影響。追蹤劑實驗結果顯示,架設的實驗系統為重力流,在定流量的條件下(4.8 mL/min),整體水利停留時間為60-75分鐘,而流經CuO透水性反應牆的時間約為10分鐘。三種氯酚類目標污染物在去離子水為基質下的去除率皆可達到99%以上,在含有各種離子的水質條件下,去除效率則有以下的趨勢:2,4,6-三氯酚 > 2,4-二氯酚 > 五氯酚。針對五氯酚在不同水質參數下的降解,實驗結果顯示氯離子和硝酸根對去除效率沒有太大影響,當硫酸根及碳酸氫根濃度分別提高至1.04 mM及10 mM,其去除率仍維持在約90%,較高濃度的腐植酸( 5 mg C/L)則使五氯酚的去除率從96%降至68%,結果顯示腐植酸可能會覆蓋在氧化銅的表面上並有消耗自由基的作用,進而影響五氯酚的降解。

並列摘要


The remediation of contaminated groundwater is important to maintain the sustainable water supply. In-site remediation is a more economical and environmentally friendly approach. Permeable reactive barrier (PRB) and in-situ chemical oxidation (ISCO) are two in-situ methods for the treatment of contaminated groundwater. In this study, CuO was used as the reactive media of PRB to activate peroxydisulfate (PDS) for the removal of three chlorophenols including 2,4-dichlorophenol (2,4-DCP), 2,4,6-trichlorophenol (2,4,6-TCP) and pentachlorophenol (PCP) under a fixed flow rate. The influences of different water matrixes including Cl-, NO3-, SO42-, HCO3- and humic acid on PCP removal were specifically investigated. Trace experiments indicated that under a flow rate of 4.8 mL/min, the hydraulic residence of the experimental system was 60-75 min and the time passing through the CuO-PRB was about 10 min. The degradation experiments showed that the removal of the three chlorophenols could reach > 99% in DI water. In the presence of various ions, the degradation showed the following trend: 2,4,6-TCP > 2,4-DCP > PCP. For the removal of PCP under different water matrixes, the results showed that Cl- and NO3- did not affect the degradation significantly and when SO42- and HCO3- increased to 1.04 mM and 10 mM, respectively, the removal still maintained about 90%. A relatively higher concentration of humic acid (5 mg C/L) reduced PCP removal from 96% to 68%, suggesting that humic acid may coat on the surface of CuO and scavenge the radicals formed from the activation of PDS.

參考文獻


Reference
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