電觸媒應用於鑄幣廠及印刷廠廢水之研究

The Study of The Electrocatalyst Technique Application on The Mint and Printing Wastewater

許洋銘(Yang-Ming Hsu)

指導教授 ： 章日行

朝陽科技大學/理工學院/環境工程與管理系/碩士(2012年)

摘要

電觸媒系統中的觸媒材料因可與水反應產生氫氧自由基，其可將有機污染物快速氧化，亦有良好之還原能力，將重金屬電鍍至陰極。本研究以電觸媒技術（Electrocatalysis）處理硬幣廠及印刷廠之實場水樣，且硬幣廠分為實驗室與實場規模與印刷廠為實驗室規模下，進行研究及討論。
運用電觸媒技術處理硬幣廠水樣試驗中，在實驗室與實場規模下，以二氧化銥陽極板及不銹鋼陰極板作為處理水樣之材料，藉由分析處理前後水樣之化學需氧量(COD)、pH值、導電度值(Conductivity)與重金屬(銅、鎳)的變化，瞭解觸媒電極在實驗室與實場規模處理效果之影響。實驗室規模結果中，操作電壓梯度 7.0 V cm-1、處理120 min後，水樣之化學需氧量處理效率約可高達58~75 %。而水樣重金屬濃度亦有約高達99%的去除效率，並同時可將水樣之導電度去除，其去除效率約34~59%。實場規模結果中，由於水樣含有高濃度之COD，單以電觸媒技術處理下，其效果較不顯著。因此需以電觸媒技術結合混凝程序處理，其處理後，水樣之化學需氧量處理效率可達到約67.38%~86.77%。
印刷廠水樣試驗結果中的最佳處理情況：操作電流密度50 mA cm-2、水樣導電度在5 mS cm-1、兩組電極，處理60 min後，水樣之TOC及色度處理效率約可高達75%與82%；當再結合活性碳吸附時，可再提高TOC與色度之處理效率，其去除效率皆約90%。

關鍵字

電觸媒技術 ； 重金屬 ； 有機物 ； 二氧化銥 ； 氫氧自由基

並列摘要

The electrocatalysis can be produced the hydroxyl radicals by water molecule interacting with the catalytic materials in the aquatic system. It’s not only able to oxidize the organic pollutants effectively, but also can reduce the heavy metal to coat on the cathode. The study is to treat the mint and printing real wastewater by electrocatalysis. The mint real wastewater experiment divides into two parts that are laboratory and in-situ experiment respectively.
Both the laboratory and in-situ experiment of mint wastewater used the Iridium dioxide anode plate and stainless steel cathode. It analyzed the chemical oxygen demand (COD), pH, conductivity and heavy metals (Cu and Ni) to understand the removal efficiency. In the laboratory experiment, the removal efficiency of COD was 58~75% by the 7.0 V cm-1 voltage gradient after 120 minutes treatment. And the removal efficiency of heavy metals was up to 99%, at the same time, the removal efficiency of conductivity was about 34 to 59%. In the in-situ experiment, the sample contains high concentration of COD that can not remediation effectively only by electrocatalysis. Therefore, electrocatalysis combines with coagulation process that increases the COD removal efficiency up to 67.38~86.77%.
The results show the TOC and color removal efficiency were 75% and 82% respectively in best operating parameters of electrocatalysis that are 50 mA cm-2 crrent density, couple of electrodes and 60 minutes treatment. It can increases the TOC and color removal efficiency up to about 90% which combined the activated carbon adsorption process.

並列關鍵字

IrO2 ； electrocatalytst ； hydroxyl radical ； organic pollutant ； heavy metal

參考文獻

1.Andreozzi, R., Caprio, V., Insola, A., and Marotta, R., “Advanced oxidation processes (AOPs) for water purification and recovery,” Catalysis Today, Vol. 53, pp. 51(1999).

2.Blake, D. M., Maness, P.C., Huang, Z., Wolfrum, E.J. and Huang, J., “Application of the photocatalytic chemistry of titanium dioxide to disinfection and the killing of cancer cells,” Separation and Purification Methods, Vol. 28, pp. 1-50(1990).

3.Bhave, R. C., and Lee, B. I., “Experimental variables in the synthesis of brookite phase TiO2 nanoparticles,” Materials Sicence and Engineering A, Vol. 467,pp. 146-149(2007).

4.Bensalah, N., Quiroz Alfaro, M. A., and Martinez-Huitle, C. A., “Electrochemical treatment of synthetic wastewaters containing Alphazurine A dye,” Chemical Engineering Journal, Vol. 149, pp. 348-352(2009).

5.Chen, J. P., and Lim, L. L., “Recovery of precious metals by an electrochemical deposition method,” Chemosphere, Vol, 60, pp. 1384-1392 (2005).