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題名 | UV/H[feaf]O[feaf]系統分解水中二氯苯污染物之研究=The Study of the Decomposition of Dichlorobenzene in Aqueous Solution by UV/H[feaf]O[feaf] System |
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作者姓名(中文) | 祝德杭; 曾迪華; | 書刊名 | 農業工程學報 |
卷期 | 48:2 2002.06[民91.06] |
頁次 | 頁43-53 |
分類號 | 445.46 |
關鍵詞 | 高級氧化程序; 紫外線/過氧化氫系統; 二氯苯; Advanced oxidation process; UV/H[feaf]O[feaf] system; Dichlorobenzene; |
語文 | 中文(Chinese) |
中文摘要 | 本研究以UV/H₂O₂程序處理水中氯苯類污染物,並探討光強度、溶液pH值、H₂O₂添加量及污染物初始濃度等操作因子,對於三種二氯苯污染物(1,2-、1,3-和1,4-dichlorobenzene, DCB)之處理效果的影響。實驗結果顯示,1,3-及1,4-DCB的分解反應速率,隨pH的增加而有下降的趨勢,而1,2-DCB在pH=3~9之間,其分解反應速率反而有隨pH增加而上升的趨勢,不過,在高pH情況下,系統受到鹼催化作用的影響,均會導致分解速率明顯的下降。當紫外光光強度增強時,可明顯提高DCB的去除速率,然而當光強度超過6.5 mW/cm²時,反應速率增加的趨勢,則有減緩的現象。三種二氯苯均有相同的最適H₂O₂添加量(H₂O₂/C₀=42),但超過此添加量時,反應速率不再隨H₂O₂添加量的增加而有顯著的增加。此外,1,2-及1,3-DCB的初始濃度在10¯⁴M以下時,對反應速率的影響並無明顯的差異,但1,4-DCB的反應速率則會隨初始濃度增加,而有明顯減小的趨勢。本研究結果顯示,三種二氯苯在UV/H₂O₂系統中的分解反應速率大小,依序為1,4-DCB>1,3-DCB>1,2-DCB。 |
英文摘要 | The objective of this study was to investigate the efficiency of UV/H₂O₂ system for decomposing 1,2-, 1,3- and 1,4-dichlorobenzene (DCB) presented in aqueous solution. The factors affected the system performance, included UV light intensity, solution pH, H₂O₂ dosage and initial pollutant concentration, were studied. Experimental results revealed that the reaction rate of decomposing 1,3- and 1,4-DCB decreased with the increase of pH and the rate for 1,2-DCB increased with the increase of pH in the range of 3 to 9. However, the degradation rate of DCB was reduced at higher pH due to H₂O₂ was undergoing a base-catalyzed decomposition. The effect of UV light intensity showed that the decomposition rate of DCB increased with the increase of light intensity, but the effect became insignificant as the light intensity was greater than 6.5 mW/cm². Similarly, the degradation rate of DCB increased with the increase of H₂O₂ dosage up to H₂O₂/C₀ = 42. Beyond this optimum dosage, however, the increase of degradation rate was negligible. The effect of initial DCB concentration on the decomposition rate was insignificant for 1,2- and 1,3-DCB at the concentration below 10⁻⁴M, but the rate was decreased with the concentration increased for 1,4-DCB. In general, the degradation rate of DCB in UV/H₂O₂ system was in the order of 1,4-DCB>1,3-DCB>1,2-DCB. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。