Effect of Compost Conditions on Power Performance of Miniaturized Microbial Fuel Cells

• Main Authors: Fan-Ying Liao, 廖凡瑩
• Other Authors: Chin-Tsan Wang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/jn68xu

碩士 === 國立宜蘭大學 === 機械與機電工程學系碩士班 === 101 === As the best method of treating organic, compost has been abstracting more and more attention. In this study, the microbial fuel cell (MFC) technology is applied to the compost to explore the role of the fermentation mechanism in the power generation. It is expected that the power generation of MFC would break the balance of microbial metabolism, accelerate the metabolic capability, and shorten the ripening time of the compost.The experiment conditions were determined utilyzing the structure optimization. In order to determine the role of some key parameters played in the MFC power generation, three sets of experiment were designed with the substrate of soybean meal, coffee grounds and rice hull separately. The first experiment was set to test the relation between the compost conditions (carbon-nitrogen ratio, optimal moisture content, temperature and pH) and the power performance. It turned out that the best power performance was obtained under the optimal compost conditions: C/N=31:1, moisture content=60% and pH= neutral, with the power density 11.18 mW/m2. When the temperature increased to 55 ℃ during composing, power density increased to 33.1 mW/m2. When the temperature reaches 70℃, MFC started to discharge in the mesotherm stage and stopped sterilizing. In order to improve the power performance, some common accelerate decomposition enzyme was added in the second set . The results showed that 10ml enzyme could help enhance the power density by 8.5 times, with the maximum power density 264.7mW/m2. In the third experiment, the B12 was used as the air cathode. It is found that the structure of B12 becomes stable after sintering at 700 ℃, and the power performance of B12 was more stable and durable than that of Pt during the constant resistance discharging, with the maximum power density 115.2 mW/m2. The application of MFC combined with compost is discussed in the study, and the results show that it is meaningful and helpful for the improvement of power performance of MFC.