| Summary: | 碩士 === 國立臺灣師範大學 === 圖文傳播學系 === 93 === 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.
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