期刊
JOURNAL OF CLEANER PRODUCTION
卷 229, 期 -, 页码 542-551出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2019.04.308
关键词
Microbial fuel cell; Flow-through; Composite anode; Power generation; COD removal
资金
- National Natural Science Foundation of China [51778326]
- Major Science and Technology Program for Water Pollution Control and Treatment of China [2017ZX07202003]
- Tsinghua University Initiative Scientific Research Program
As a viable wastewater treatment and energy recovery technology, microbial fuel cell (MFC) requires more research with regard to the simultaneous achievement of high-quality effluent and high power generation. In this study, a novel flow-through carbon-based composite anode configuration is proposed, which combines the carbon cloth of two-dimensional anode with wooden granular activated carbon of three-dimensional anode. The proposed configuration enhances the performance of power production and chemical oxygen demand degradation by promoting the mass transfer, reducing internal resistance and increasing bioburden. Microbial fuel cell with the composite anode exhibited the highest maximum power density (1300 +/- 50 mW m(-2)) and the highest chemical oxygen demand removal rate constant (0.155 +/- 0.007 h(-1)) compared with the microbial fuel cell using the carbon cloth anode (1136 +/- 46 mW m(-2) and 0.072 +/- 0.008 h(-1)) or the wooden granular activated carbon anode (1045 +/- 32 mW m(-2) and 0.129 +/- 0.009 h(-1)). Meanwhile, at a lower chemical oxygen demand concentration (about 48 mg L-1), the microbial fuel cell with the composite anode maintained a current density of 2.4 A m(-2), which is 18% higher than the wooden granular activated carbon anode (2.04 A m(-2)) and 400% higher than the carbon cloth anode (0.48 A m(-2)). The cyclic voltammetry and electrochemical impedance spectroscopy tests confirmed that the composite anodes displayed better electrochemical performance. Improving the flow rate and reducing the external resistance could effectively enhance the power production and chemical oxygen demand removal performance of microbial fuel cells, while the computational fluid dynamics simulation intuitively demonstrated the positive effect of the composite anode on chemical oxygen demand degradation. These results suggest that the flow-through composite anode provides a feasible strategy to simultaneously enhance the power generation and improve the effluent quality. (C) 2019 Elsevier Ltd. All rights reserved.
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