International Journal of Applied Microbiology and Biotechnology Research
ISSN: 2053-1818
Vol. 4(2), pp. 7-14, February 2016



Series and parallel connection of anaerobic fluidized bed microbial fuel cells (MFCs)

Liu Xinmin1,2*, Wu Jianjun1 and Gong Benyue2

1National Engineering Research Center of Coal Preparation and Purification, Key Laboratory of Coal Processing and Efficient Utilization in Ministry of Education, China.
2University of Mining and Technology, Xuzhou 221008, P. R. China.

*To whom correspondence should be addressed. E-mail: lxm220@qust.edu.cn.

Received 10 January, 2016; Received in revised form 31 January, 2016; Accepted 03 February, 2016.

Abstract


Keywords:
Anaerobic fluidized bed, Microbial fuel cell, Open circuit voltage.


The effects of the connection manner of anaerobic fluidized bed microbial fuel cells (MFCs) on the properties of electricity generation and sewage treatment were investigated in the liquid-solid fluidized bed single-chamber membrane air-cathode fuel cells (0.032 m in diameter, 0.6 m in height). In addition, the effects of electrode area, filling volume of activated carbon and temperature on electricity generation were studied. The results obtained show that the maximum open circuit voltage (OCV) of serially connected stack MFC (three microbial fuel cells) was about 2100 mV equivalents to the sum of the individual MFCs. The maximum power of the series MFCs and the single fuel cell were 0.12 and 0.05 mW, respectively. In parallel, the maximum total OCV was 800 mV, corresponding to the maximum current of 0.3 mA. Moreover, the maximum OCV increased by 78% when anode area increasing from 17 to 68 cm2. The electricity generation could be increased with increasing filling volume of activated carbon. The maximum OCV and the minimum resistance of the MFCs series both observed at 40°C. And the chemical oxygen demand (COD) of simulated wastewater decreased to 31.75 from 3859 mg/L after running 4 days in this MFCs system.

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