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Water 2017, 9(3), 185; doi:10.3390/w9030185

Optimization of Bioelectricity Generation in Constructed Wetland-Coupled Microbial Fuel Cell Systems

1
School of Energy and Environment, Southeast University, Nanjing 210096, China
2
School of Civil Engineering, Southeast University, Nanjing 210096, China
*
Author to whom correspondence should be addressed.
Academic Editors: Ranka Junge and Fabio Masi
Received: 27 November 2016 / Revised: 24 February 2017 / Accepted: 3 March 2017 / Published: 6 March 2017
View Full-Text   |   Download PDF [2132 KB, uploaded 6 March 2017]   |  

Abstract

Constructed wetland-coupled microbial fuel cell systems (CW-MFCs) incorporate an aerobic zone and an anaerobic zone to generate electricity that achieves the oxidative degradation of contaminants. However, there are few reports on the performance of such coupled systems. In this study, we determined the optimal configuration of CW-MFCs to characterize their electricity generation performance. Based on the results using different levels of dissolved oxygen among the CW-MFCs, we concluded that a 20-cm distance between the anode and cathode produced an optimal removal of chemical oxygen demand (COD) of 94.90% with a 0.15 W/m3 power density, 339.80 Ω internal resistance, and 0.31% coulombic efficiency. In addition, a COD of 200 mg/L provided greater electricity generation (741 mV open circuit voltage, 0.20 W/m3 power density, 339.80 Ω internal resistance, and 0.49 mA current) and purification ability (90.45% COD removal) to meet system COD loading limitations than did higher COD values. By adding 50 mM phosphate buffer solution to synthetic wastewater, relatively high conductivity and buffer capacity were achieved, resulting in improvement in electricity generation. These findings highlight important aspects of bioelectricity generation in CW-MFCs. View Full-Text
Keywords: constructed wetland; microbial fuel cell systems; bioelectricity generation; power density; internal resistance constructed wetland; microbial fuel cell systems; bioelectricity generation; power density; internal resistance
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Song, H.; Zhang, S.; Long, X.; Yang, X.; Li, H.; Xiang, W. Optimization of Bioelectricity Generation in Constructed Wetland-Coupled Microbial Fuel Cell Systems. Water 2017, 9, 185.

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