Analysis of synergistic effects of process factors on energy distribution in MFCs

doi:10.11949/j.issn.0438-1157.20171073

Abstract

Abstract:

Microbial fuel cell (MFC) is a novel energy conversion device which is able to convert chemical energy into electrical energy. In MFCs, organic matter was degraded in ways of microbial metabolism and bioelectricity conversion. According to the different allocation requirements of energy in the process of operation, the energy flow could be controlled by changing the operation parameters. In this study, MFCs factors, such as pH, organic load, dissolved oxygen, electrical conductance and external resistance, were applied by orthogonal design experiments to optimize parameters for regulation of energy flow. The results showed that the highest efficiency of electric energy conversion was 8.74% and the loads and resistances were significant factors. On the other hand, the highest efficiency of biological metabolism was 66.03% and the load and pH were significant factors. Therefore, when the system was under the same load condition, if the MFC were used as an electrical conversion units, the external resistances should be controlled, while if organic matter conversion capacity was required to be improved, the pH should be controlled.

Key words: microbial fuel cell, organic compounds, process control, degradation, energy distribution, process factors

摘要：

微生物燃料电池（MFC）以产电和代谢的方式利用系统能量实现有机物降解。针对运行过程中能量的不同分配需求，以pH、有机负荷、溶解氧、电导率和外电阻为工艺因子，采用正交实验方法优选最佳工艺条件，从而实现MFC能量流调控的目的。研究表明：在实验工况下，最高产电能量转化效率和生物代谢能量利用效率分别为8.74%和66.03%，负荷和外电阻对产电能量转化效率有显著影响，负荷和pH对能量利用效率有显著影响，系统能量主要以生物代谢方式被利用。由此可见，在同等负荷条件下，若将MFC作为电转化单元时应主要控制其外电阻，若需提高MFC的有机物降解能力时pH则是首要控制因素。

关键词: 微生物燃料电池, 有机化合物, 过程控制, 降解, 能量分配, 工艺因子

CLC Number:

X703.1

CHENG Ben'ai, JIA Hui, YANG Guang, LIU Wenbin, ZHANG Hongwei, WANG Jie. Analysis of synergistic effects of process factors on energy distribution in MFCs[J]. CIESC Journal, 2018, 69(5): 2242-2249.

程本爱, 贾辉, 杨光, 刘文斌, 张宏伟, 王捷. 工艺因子对于MFC中能量分配的协同效应分析[J]. 化工学报, 2018, 69(5): 2242-2249.

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