| Summary: | 碩士 === 國立雲林科技大學 === 環境與安全衛生工程系碩士班 === 102 === The photoelectric and semiconductor industries wastewater usually contain specific chemical solvents or heavy metals, which have a specific toxic and corrosive, in the lithography process of optical thin film transistor liquid crystal display (TFT-LCD) ,tetra methyl ammonium hydroxide(TMAH) is often used as the developer which is a kind of alkaline compound with highly toxic and corrosive, and has a high concentration of chemical oxygen demand. As an innovative treatment technology, The literature microbial fuel cell (MFC) can convert organic compounds into electricity, not only enhances degradation of contaminant, Withstand a certain degree of toxic compounds but also provide a steady power. This study used a H-type MFC (H-MFC) made from an acrylic sheet. The H-MFC, with anode and cathode chamber volumes of 250 ml, were separated by a proton exchange membrane (PEM) Nafion ® 117. Carbon rods or Carbon cloth, used as electrodes in both the anode and cathode chambers, were connected by copper wires and a 1-kΩ resistor to form a circuit. The anaerobic mix culture was selected from upflow anaerobic sludge blanket (UASB) of photoelectric industry as anode in this study. The potassium ferricyanide buffer was added into the cathode chamber. Research results were shown as follows. (1) The efficiency of COD degradation for TMAH wastewater under closed-circuit was increased by approximately 17% than open-circuit in a reaction time of 24 hours, and the total removal rate of COD under closed and open circuit are both approximately 84% to 85% mainly due to the existence of substance which is hardly decomposed in TMAH wastewater. (2) The significant difference for the efficiency of electricity production can be observed by changing the electrode in MFC system. The maximum power density that carbon rod can achieve is 10.7MW/m2,with 0.88~1.55kΩ inner resistance. And for carbon cloth, the maximum power density and inner resistance are 10.7MW/m2 and 1.0~3.3 kΩ. Carbon rod has the better efficiency of electricity production than carbon cloth due to the lower inner resistance.(3) After diluting the TMAH wastewater, it shows that the lowered COD concentration of TMAH wastewater will affect the removal rate of COD and improve the efficiency of electricity production mainly due to the reduction of microbial inhibition by the organics.
Keywords: High chemical oxygen demand, Tetra methyl ammonium hydroxide, Microbial fuel cell, Electricity generation, Electricity production efficiency
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