Investigation of Performances of the Microbial Fuel Cell (MFC) and Electricity Storage System

• Main Authors: Yu-Wen Huang, 黃郁雯
• Other Authors: 周楚洋
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/27497254341275185465

碩士 === 國立臺灣大學 === 生物產業機電工程學研究所 === 100 === Microbial fuel cell could produce electricity and treat wastewater at same time. If MFC applied to farms to reach the dual advantages, the deal with swine waste water and electricity to feedback of the pig farms. But energy generated by the microbial fuel cell not enough to start the electronic components directly. To increase the output voltage of the MFC, two air-cathode MFCs were connected in series.In this study, immobilized cells with anaerobic bacteria which was acquire from a three-stage swine wastewater treatment system were packed into the anodic compartment. The artificial wastewater operations bacteria acclimated in two different HRT conditions (short period of acclimation: HRT 1; long period of acclimation: the HRT 3 days), followed by swine waste water as substrate and operating at HRT 3 days,1 day, and 0.5 day. To investigate the performance impact of different operating conditions for the electricity production of the MFC system. The results show that under the same HRT, the bacteria after a long period of acclimation is conducive to the enhancement of COD removal efficiency and to reduce the internal resistance. HRT shortening will be decreased the COD removal, voltage and current performance and no significant difference. Series MFC will lead to a decline in the coulomb efficiency is not conducive to electronic recycling. Eelectrical storage system contained super capacitors, switches, and the boost converter. The energy generated by the MFC system is stored in a different capacity super capacitor (1 F, 6.6 F and 10 F). The electrical storage capacitor voltage of 0.5 V to calculate the electrical storage performance, and finally the stability of the boost converter output 3.3 V, to start the red LED. The maximum average storage rate of the two acclimation condition would appear in the super capacitor of 1 F connection. However, if the capacitor voltage up to 1.4 V, the super capacitor of 1 F only provide less than 1 W of power, a bit less than in actual use. Electrical storage efficiency decreased with the increase of the capacitance, but large-capacity capacitor can store more power, so according to the actual load demand to choose the right capacitor. MFC system would store the energy to super capacitor of 10 F, and when the charging voltage reached 0.7 V, a red LED lights for approximately 10 seconds.