應用奈米鐵粉於電凝系統處理印刷電路板廢水之研究

A Study of Printed Circuit Board Wastewater via Electrical Coagulation System Treatment by Nanoscale Iron Particles

陳輝霖

指導教授 ： 陳忠輝 ； 連惠心

國立臺灣師範大學/科技學院/圖文傳播學系/碩士(2004年)

摘要

印刷電路板在製程中使用多種化學藥品及特殊原料，所產生的污染物亦大多具危害性，易衍生嚴重的環保問題。而目前印刷電路板業者之廢水處理系統，無法對高含量之化學需氧量（COD）廢水做有效處理。而電凝系統其有佔地小、操作簡單、操作費用低及處理效率佳等優點。另外，奈米鐵粉具有高表面積與高體積比的特性與反應速率快、處理效能佳等優勢。
有鑑於奈米鐵粉的各種優越特質，本研究藉由奈米鐵粉應用於電凝處理系統中，探討電凝系統之各項操作變因，包括：pH值、電壓、電凝停留時間等，對於處理效能的影響並分析最佳的操作條件與處理流程。研究之實驗分為三個部分進行，第一部份為電凝前導實驗，第二部分為未添加奈米鐵粉之電凝實驗，第三部分則為添加奈米鐵粉之電凝實驗。研究結果顯示，在添加奈米鐵粉、pH＝2、電壓100V及電凝停留時間5分鐘下有最佳的處理效能；根據此操作條件與處理流程，其COD去除率可達95.28％；因此，應用奈米鐵粉於電凝系統能有效去除、降低印刷電路板廢水COD污染。

關鍵字

印刷電路板廢水 ； 電凝系統 ； 奈米鐵粉 ； 化學需氧量

並列摘要

Many kinds of chemical and special raw material are used in the process of manufacturing printed circuit board. It produces a large amount of harmful waste liquid and pollutants which can derive to a severe environmental issue. Nowadays the problem of high content of COD (Chemical Oxygen Demand) still can not be solved effectively in the wastewater process system . The electrical coagulation system has some advantages such as small land occupation, simple operation, low operation cost and high efficiency. In addition, the nanoscale iron particles have some features such as high volumes of surface area and mass, quick response speed and high efficiency.
Due to various kinds of superior characteristics of nanoscale iron particles, this research employ the nanoscale iron particles in developing electrical coagulation system, and evaluated every factor in electrical coagulation system which includes PH index, power voltage and hydraulic retention times (HRT). This research is trying to analyze the best operating condition and procedure for treatment efficiency. The experiments in this study consisted of three phases: The first part, the experiment of leading the way for the electrical coagulation. The second part, the experiment of electrical coagulation for not adding the nanoscale iron particles. The third part, the experiment of electrical coagulation for adding the nanoscale iron particles.The study result shows that the best treatment efficiency was adding nanoscale iron particles, while PH=2 with applied power voltage 100V within 5 minutes HRT. Based on this operation condition and follow the procedure, up to 95.28% of COD can be cleaned out. It was verified by the experiment that the method of adding nanoscale iron particles in electrical coagulation system during the treatment of printed circuit board wastewater can eliminate and reduce the COD waste water in printing circuit board effectively.

並列關鍵字

Printed Circuit Board（PCB）Wastewater ； Electrical Coagulation System（EC） ； Nanoscale Iron Particles ； Chemical Oxygen Demand（COD）

參考文獻

張立德（2002）。奈米材料。台北：五南。

廖建治（2002）。電路板剝膜廢液之化學及生物處理。私立元智大學化學工程學研究所碩士論文，桃園。

Barrett, N. P. (1993). Alternating current electro coagulation for superfund site remediation, Air&Waste, 43, 784-789.

Gillham, R. W., & S. F. O’Hannesin. (1994). Enhanced degradation of halogenated aliphatics by zero-valent iron. Ground Water, 32, 958–967.

Gurses A., Yalcin M., & Dogar, C. (2002). Electro coagulation of some reactive dyes: A statistical investigation of some electrochemical variables, Waste Management, 22, 491-499.