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年度	106	專案性質	實驗性質
專案類別	研究專案	研究主題	整治
申請機構	國立台灣大學	申請系所	環境工程學研究所
專案主持人	林逸彬	職等/職稱	副教授
專案中文名稱	以氧化銅活化過二硫酸鹽降解地下水有機污染物之研究
中文關鍵字	過二硫酸鹽, 氧化銅, 地下水, 非自由基
專案英文名稱	Degradation of organic pollutants in groundwater by CuO-activated peroxydisulfate
英文關鍵字	Peroxydisulfate, CuO, Groundwater, Non-radical
執行金額	700,000元
執行期間	2017/1/9 至 2017/11/30
計畫中文摘要	有效整治受有機物污染之土壤及地下水為建立永續水資源之重要議題。現地化學氧化法 (In-Situ Chemical Oxidation, ISCO) 係直接注入氧化劑於土壤或地下水體以達到污染物降解的氧化方法，因不須將地下水抽至地面成本較低，目前被廣泛應用於土壤及地下水污染整治上。硫酸鹽屬於較新穎的氧化劑，包含過單硫酸鹽 (PMS, HSO5−) 和過二硫酸鹽 (PDS, S2O82−) 兩類，與其他氧化劑相比，可適用在較廣pH範圍及長途運輸，亦可有自由基的產生。常見的過硫酸鹽的氧化降解機制，主要活化過硫酸鹽後產生的自由基與有機物污染物結合進行反應。然而，自由基的反應機制，會受到自然水體中的鹵素、天然有機物及其他水質參數的影響，可能間接產生毒性更強的副產物。本研究計畫使用氧化銅 (CuO) 為活化劑，對過二硫酸鹽進行活化，降解常見之地下水有機污染物，研究結果顯示氧化銅活化二硫酸鹽在中性條件下為一非自由基之反應，反應機制為PDS先吸附於氧化銅表面，此吸附之PDS 以氧化銅作為電子傳遞媒介，進行污染物氧化反應，值得注意的是實驗結果顯示污染物不須強烈吸附於氧化銅表面，此反應即可進行，且在未添加氧化銅的條件下，PDS不具降解污染物之能力。鹵素離子的存在不影響2,4-二氯酚之降解，並可透過增加氧化銅劑量解決天然有機物的干擾。此處理程序對於添加於真實地下水的有機污染物也具有良好的降解效果。
計畫英文摘要	Remediation of soil and groundwater contaminated by organic pollutants is a key component to develop a sustainable water supply. In-situ chemical oxidation (ISCO) is a method that directly introduces the oxidant into soil or groundwater to degrade organic contaminants. Because of its relatively low cost due to the elimination of pumping, ISCO has been widely considered in real practices. Persulfates, including peroxymonosulfate (PMS, HSO5−) and peroxydisulfate (PDS, S2O82−), are novel oxidants considered in ISCO. They possess a long lifetime in the aquifer and can be activated to form radicals to effectively degrade organic contaminants. The presence of halide ions and natural organic matter (NOM), however, may react with these radicals to produce unwanted toxic by-products. We propose to use CuO as an activator to activate PDS to degrade common organic pollutants found in contaminated groundwater. Our results showed that PDS activation is a non-radical process at neutral pH conditions. The degradation mechanisms involve: 1. adsorption of PDS on the CuO surface and 2. Adsorbed PDS utilizes CuO as an electron shuttle to oxidize the target organic contaminants. Experimental results demonstrated that the organic contaminants do not need to strongly adsorb on the CuO surface for the reaction to proceed and that the degradation did not proceed in the absence of CuO. The presence of halogen ions did not affect the degradation of 2,4-dichlorophenol and the interference caused by the presence of NOM can be resolved by increasing CuO dosage. The test using real groundwater showed good degradation efficiencies.