Photo-Fenton相關程序處理人工染整廢水之比較

淡江大學機構典藏 > 工學院 > 水資源及環境工程學系暨研究所 > 學位論文 > Item 987654321/52589

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题名:	Photo-Fenton相關程序處理人工染整廢水之比較
其它题名:	Comparisons of the treatment of synthetic textile wastewater between Photo-Fenton related processes
作者:	林薇薇;Lin, Wei-wei
贡献者:	淡江大學水資源及環境工程學系碩士班康世芳;Kang, Shyh-fang
关键词:	Photo-Fenton;礦化;脫色;染料;混凝;Photo-Fenton;H2O2/UV;advanced oxidation process(AOPs);mineralization
日期:	2010
上传时间:	2010-09-23 17:57:55 (UTC+8)
摘要:	Photo-Fenton程序兼具OH‧氧化及鐵鹽混凝雙重功能去除有機物，本研究評估Photo-Fenton相關程序氧化與混凝去除有機物之比較，Photo-Fenton相關程序包含Photo-Fenton-like、H2O2/UV、Fenton。以反應性偶氮染料Evercion Red H-E3B與聚乙烯醇(Poly(vinyl alcohol), PVA)分別模擬染整廢水中色度與DOC，人工染整廢水色度與DOC濃度分別為1300 單位與31 mg/L。以pH、氧化時間、鐵鹽種類與加藥量及H2O2加藥量為操作變數，分析H2O2、色度及DOC殘留，以比較Photo-Fenton相關程序去除DOC效率、反應動力學及機制。所有實驗採批次式H2O2/UV光反應槽。研究結果顯示Photo-Fenton程序去除DOC與色度最佳pH為3，於氧化時間5分鐘時色度與DOC去除率分別為98%與45%。當氧化時間120分鐘時，Photo-Fenton及H2O2/UV程序之DOC去除率皆可達90 %以上，但Fenton程序僅有50%，DOC去除效率依序為Photo-Fenton = H2O2/UV > Fenton程序。去除DOC為擬一階反應動力學，Photo-Fenton程序反應動力常數為H2O2/UV程序之3.2倍，顯示H2O2/UV程序添加Fe2+加藥量，可提高反應速率縮短反應時間，但無法提高DOC去除率。Fenton程序去除DOC機制主要為混凝去除；Photo-Fenton程序於反應初期(5分鐘)，DOC去除率為49.7%，混凝與氧化去除DOC分別為41.6%與8.1%，故主要以混凝機制去除DOC。相對地，於反應後期(30分鐘) DOC去除率為81.4%，混凝與氧化去除DOC分別為26.3%與55.1%，主要以氧化機制去除DOC。此乃因於反應後期，H2O2/UV可持續催化產生OH‧氧化有機物及膠羽，此外，Photo-Fenton-like程序去除DOC機制與相似。 The Photo-Fenton process is one of the advanced oxidation processes (AOPs) which eliminates organic matter by both hydroxyl radical (OH‧) oxidation and iron salts coagulation. The research evaluates the extent of oxidation and coagulation in Photo-Fenton-related processes. The Photo-Fenton-related processes include Photo-Fenton-like, H2O2/UV and Fenton processes. A reactive azo dyestuff (Evecion Red H-E3B) and polyvinyl alcohol (PVA) were used to simulate color and dissolved organic carbon (DOC) in the industrial textile wastewater, which contains color of 1300 ADMI unit and DOC of 31 mg/L. The experimental variables include pH, oxidation time, dosages of iron salt (ferric or ferrous) and hydrogen peroxide (H2O2). The content of H2O2, color unit and residual of DOC were measured for comparing the efficiency of DOC removal and reaction kinetics. All the experiments were batch conducted in H2O2/UV reactor. The results show that the optimal pH to remove DOC and color is 3 within 5 minutes of oxidation time and the color and DOC removal efficiency is 98% and 45% respectively. The DOC removal efficiency could go more than 90% in both Photo-Fenton and H2O2/UV processes while only of 50% in Fenton process. The efficiency of DOC removal was in the order of Photo-Fenton = H2O2/UV > Fenton. The pseudo-first-order reaction kinetics were fitted in DOC removal and found the rate constant in Photo-Fenton process is 3.2 times higher than H2O2/UV processes which indicated that dosing more Fe2+ in the process could only promote the reaction rate not DOC removal efficiency instead. The major mechanism to remove DOC is coagulation in Fenton process. In Photo-Fenton process, the major mechanism to remove DOC is coagulation at the first 5 minutes of the experiment with 49.7% COD removal efficiency, within which 41.6% was contributed by coagulation and the other 8.1% was by oxidation. Contrarily, in Photo-Fenton process, the major mechanism to remove DOC is oxidation at 30 minutes of the experiment with 81.4% COD removal efficiency, within which 26.3% was contributed by coagulation and the other 55.1% was by oxidation. This is due to the OH‧ was constantly generated at the final stage in the H2O2/UV process for oxidizing organic matter and floc. Meanwhile, the DOC removal mechanism by Photo-Fenton-like process was alike to Photo-Fenton process.
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