Fenton相關程序去除色度與DOC之研究

Removal of color and organics by Fenton related processes.

陳佩茹(Pei-Ru Chen)

指導教授 ： 康世芳

淡江大學/工學院/水資源及環境工程學系碩士班/碩士(2010年)

https://doi.org/10.6846/TKU.2010.01061

摘要

Fenton程序兼具氫氧自由基(OH•)氧化及鐵鹽混凝雙重功能去除有機物，本研究探討Fenton相關程序去除色度與DOC之效率與去除機制，Fenton相關程序包含混凝、Fenton及Fenton-like程序。以反應性偶氮染料Evercion Red H-E3B與聚乙烯醇(Poly(vinyl alcohol), PVA)配製染料濃度20~100 mg/L、PVA 50 mg/L之人工染整廢水，以pH、鐵鹽種類與加藥量及H2O2加藥量為操作變數，所有實驗皆採取瓶杯試驗。
　　研究結果顯示Fenton程序之最佳操作pH範圍為2.5~4，色度及DOC去除率可達95 %及78 %以上。Fenton及Fenton-like程序於低鐵鹽加藥量(5 mg/L)，色度去除率可達90 %以上，但DOC去除率低於13 %，脫色所需之鐵鹽加藥量低於混凝程序，Fenton相關程序單位鐵鹽加藥量去除色度約為混凝之6至7倍 ，Fenton程序氧化與混凝去除之色度分別為88.9 %與2.7 %，脫色以氧化機制為主。高鐵鹽加藥量(50 mg/L)時，可同時去除DOC與色度分別達75%與95%以上，DOC去除效果則以Fenton-like最佳(Fenton-like＞混凝≒Fenton)。Fenton氧化與混凝機制去除之DOC為7.9 %與72.9 %，Fenton-like程序則為3 %與74.2 %。增加鐵鹽加藥量可提升去除DOC之成效，混凝機制去除之色度隨鐵鹽加藥量增加而趨顯著。此外，增加H2O2加藥量雖可增加氫氧自由基生成，但仍無法提供礦化去除DOC，增加H2O2加藥量提高無法顯著提高DOC去除率。依本研究結果，建議廢水脫色採用以氫氧自由基氧化為主之Fenton、Fenton-like程序；，同時脫色去除DOC則採用鐵鹽混凝程序。

關鍵字

混凝 ； Fenton ； Fenton-like ； 脫色

並列摘要

The purposes of this study are to investigate the removals of color and dissolved organic carbon (DOC) by ferric coagulation, the Fenton and Fenton-like processes, to compare the removal mechanisms of color and DOC among three processes. The synthetic colored wastewater samples were prepared from 20~50 mg/L of a red reactive azo dyestuff (Red H-E3B) and 50 mg/L of polyvinyl alcohol (PVA).The experimental variables studied include dosages of iron salts (ferrous and ferric) and hydrogen peroxide (H2O2), pH. All experiments were conducted by the Jar test.
The result shows that more than 95 % and 78 % of color and DOC can be removes by Fenton and Fenton-like processes when pH is between 2.5 to 4. In low iron dosages (5 mg/L), by both Fenton and Fenton-like processes, the color removals was higher than 90 %, but the removal of DOC was lower than 13 %. The iron dosages used for decolorization by Fenton and Fenton-like processes are lower than ferric coagulation. The ratio of color removal efficiency, expressed by color removed per iron dosage, between Fenton related processes and ferric coagulation was 6~7. The ratio of color removal by OH． Oxidation and ferric coagulation was 32.9 : 1 and 1.37 : 1 by Fenton and Fenton-like processes, respectively.
In high iron dosages (50 mg/L), Fenton-like process has the best efficiency of DOC removal between ferric coagulation and Fenton related processes. The ratio of DOC removal by OH． Oxidation and ferric coagulation was 1 :9.2 and 1 : 9.39 by Fenton and Fenton-like processes, respectively. Increase H2O2 dosages can increase the ratio of color removal by ferric coagulation by Fenton process. In Fenton-like process, the ratio of color removal increase when H2O2 dosages increase. For the removal of DOC, increase H2O2 dosage won’t improve the efficiency of DOC.
It was also found that the non-color background organic compound PVA can complete with the red dye H-E3B for OH．, leading to the reduced color removal as the PVA content increases. Therefore, it demonstrated that the removal of color is the OH． Oxidation and the removal of DOC is ferric coagulation by Fenton related processes. It is concluded that both the Fenton and Fenton-like processes were better used for color removal but DOC removal.

並列關鍵字

Coagulation ； Fenton ； Fenton-like ； Decolorization ； Textile wastewater

參考文獻

36. 中華民國行政院環境保護署, 2009. 水汙染防治法規,放流水標準.

1. Azbar N., Yonar T., and Kestioglu K. 2004. Comparison of various advanced oxidation process and chemical treatment methods for COD and color removal from a polyester and acetate fiber dyeing effluent. Chemosphere, 55, 35-43.

2. Badawy M.I. and Ali M.E.M., 2006. Fenton’s oxidation and coagulation processes for the treatment of combined industrial and domestic wastewater. Journal of Hazardous Materials, 136, 961-966.

3. Bouasla C., Samar M. E., and Ismail F., 2010. Degradation of methyl violet 6B dye by the Fenton process. Desalination, 254, 35-41.

4. Ciotti C., Baciocchi R., and Tuhkanen T., 2009. Influence of the operating conditions on highly oxidative radicals generation in Fenton’s systems. Journal of Hazardous Materials, 161, 402-408.