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標題: pH緩衝鹼活化過硫酸鹽氧化1,2-二氯乙烷之探討
Evaluation of buffered alkaline pH activated persulfate oxidation of 1,2-dichloroethane
作者: 許展銘
Hsu, Chan-Ming
關鍵字: 現地化學氧化法;in situ chemical oxidation;1,2-二氯乙烷;鹼活化過硫酸鹽;鹼性緩衝溶液;氯化有機溶劑;1,2-dichloroethane;alkaline activated persulfate;alkaline buffer solution;chlorinated solvents
出版社: 環境工程學系所
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本研究目標首先利用不同試劑配製鹼性緩衝溶液(pH ~ 13),經由酸滴定試驗及鹼活化過硫酸鹽進行水相中1,2-DCA之降解試驗,進而篩選出較適合之鹼性緩衝溶液,由結果得知磷酸鹽所配製之溶液,相較於其它所採用之緩衝試劑,具有較佳緩衝強度並且對鹼活化過硫酸鹽之反應效能較佳。接著進一步探究不同緩衝強度磷酸鹽鹼性溶液(例如不同緩衝pH及離子強度)對氧化反應之影響,經由酸滴定試驗及比較不同反應條件下之1,2-DCA降解速率常數得知,較佳鹼性緩衝溶液pH值為8,離子強度為 1.0 M時具有較快速之1,2-DCA降解速率,且於反應過程中皆無偵測到副產物之生成。

接續以較佳鹼性緩衝溶液pH值為8,離子強度為1.0 M之反應條件,評估過硫酸鹽於土壤存在環境下對1,2-DCA之降解影響,泥水相系統中過硫酸鹽較佳劑量為0.1663 M(較佳鹼性緩衝溶液設定初始pH 8至反應最終4),於反應時間7天對於10 mg/L 1,2-DCA之去除率達64.2%,且其降解速率常數為5.1 × 10-3 hr-1。進一步依此反應條件於泥水相中氧化降解低(10 mg/L)及高(100 mg/L)濃度1,2-DCA,結果證實對於低及高濃度1,2-DCA之去除率於反應30天後分別可達99.2及94.5%,其降解速率常數分別為6.7 × 10-3及3.9 × 10-3 hr-1,且過硫酸鹽皆僅降解10%以內,pH值皆仍保持於7.5以上。此些研究成果證實pH緩衝鹼活化過硫酸鹽之反應程序可用以氧化處理1,2-二氯乙烷污染物。

Alkaline activated persulfate could generate the free radicals such as the oxidative sulfate and hydroxyl radicals, as well as the reductive superoxide radicals. Therefore, this study was to evaluate persulfate oxidation combining with alkaline pH buffer solution for the remediation of 1,2-dichloroethane (1,2-DCA) contamination. The alkaline buffer system can maintain the alkaline condition for persulfate activation and also buffer hydrogen ions released during persulfate decomposition to prevent the acidification of groundwater during in situ application.

This study initially evaluated different alkaline buffer reagents (pH ~ 13) and determind the suitable alkaline buffer solution based on the results of acid titration tests and degradation of 1,2-DCA in aqueous phase with alkaline activation persulfate. The results showed that the phosphate buffer exhibited the higher buffer intensity and the faster 1,2-DCA degradation rate. Furthermore, the effect of phosphate alkaline buffer solution with different buffer intensities (i.e. different buffered pH and ionic strength) on persulfate oxidation was investigated. Based on the acid titration tests and the degradation rate constant of 1,2-DCA, it could be seen that the rapid degradation of 1,2-DCA occurred under the conditions of buffer solution pH of 8, and ionic strength of 1.0 M, and no byproducts were detected.

The influence of soil on 1,2-DCA degradation was evaluated with fixed buffer pH of 8 and ionic strength of 0.1 M. In soil slurry systems, the optimal dose of persulfate (0.1663 M ( buffer pH set from initial 8 to final 4)) was conducted. 64.2% removal of 1,2-DCA (10 mg/L) was observed in 7 days of reaction, and the degradation rate constant was 5.1 � 10-3 hr-1. Additionally, the low and high concentration of 1,2-DCA (10 mg/L and 100 mg/L, respectively) were evaluated. The results indicated that the 1,2-DCA removal can reach 99.2% and 94.5% after 30 days with the degradation rate constant of 6.7 � 10-3 and 3.9 � 10-3 hr-1, respectively, and the persulfate consumption was less than 10%, and pH value still remained above 7.5. These experimental results confirmed that the alkaline buffer pH activated persulfate system provides a potential method for the treatment of contamination by 1,2-DCA.
其他識別: U0005-2607201216452600
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