Optimization of Bioelectricity Generation in Constructed Wetland-Coupled Microbial Fuel Cell Systems
Abstract
:1. Introduction
2. Materials and Methods
2.1. Construction of the Fuel Cell
2.2. Electrochemical and Chemical Monitoring
2.3. Operating Parameters
3. Results and Discussion
3.1. Effects of DO on Voltage in the VSFCW-MFC System
3.2. Bioelectricity Generation with Different Electrode Spacings
3.3. Effect of Influent COD on Bioelectricity Generation
3.4. Electrical Performance with the Addition of PBS
4. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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First Trial: Synthetic Wastewater (SW) with Phosphate Buffer Solution (PBS) | Second Trial: SW without PBS | Third Trial: SW without PBS | |||
---|---|---|---|---|---|
Ingredient | Concentration (mg/L) | Ingredient | Concentration (mg/L) | Ingredient | Concentration (mg/L) |
Glucose | 200.00 | Glucose | 200.00 | Glucose | 200.00 |
Carbamide | 10.00 | KNO3 | 252.50 | KNO3 | 252.50 |
NH4Cl | 310.00 | KH2PO4 | 26.32 | KH2PO4 | 26.32 |
NaH2PO4 | 4970.00 | NaHCO3 | 336.00 | NaHCO3 | 336.00 |
Na2HPO4 | 2750.00 | MgSO4·7H2O | 200.00 | NaCl | 330.00 |
KCl | 130.00 | CaC12 | 15.00 | MgSO4·7H2O | 200.00 |
NaHCO3 | 3130.00 | FeC13·6H2O | 1.00 | CaC12 | 15.00 |
(NH4)2SO4 | 560.00 | MnSO4·H2O | 28.00 | FeC13·6H2O | 1.00 |
MgSO4·7H2O | 200.00 | CoCl2·6H2O | 2.40 | MnSO4·H2O | 28.00 |
CaC12 | 15.00 | Na2Mo4·2H2O | 0.40 | CoCl2·6H2O | 2.40 |
FeC13·6H2O | 1.00 | − | − | Na2Mo4·2H2O | 0.40 |
MnSO4·H2O | 28.00 | − | − | − | − |
CoCl2·6H2O | 2.40 | − | − | − | − |
Na2Mo4·2H2O | 0.40 | − | − | − | − |
Electrode Spacing (cm) | Current Generation (mA) | Power Density (W/m3) | COD Removal (%) in Effluent | Coulombic Efficiency (%) |
---|---|---|---|---|
10 | 0.44 ± 0.05 | 0.09 ± 0.01 | 89.60 ± 3.21 | 0.26 ± 0.03 |
20 | 0.56 ± 0.06 | 0.15 ± 0.02 | 94.90 ± 2.44 | 0.31 ± 0.02 |
30 | 0.52 ± 0.04 | 0.13 ± 0.02 | 93.31 ± 2.75 | 0.30 ± 0.03 |
40 | 0.42 ± 0.04 | 0.08 ± 0.01 | 85.42 ± 3.54 | 0.26 ± 0.01 |
Substrate Concentration (mg/L) | Bv (kg COD/ (m3·NAC·d)) | Eoc (mV) | Eoc,an (mV) | Eoc,cat (mV) | Pmax (W/m3) | Current Generation (mA) | COD Removal (%) | Coulombic Efficiency (%) |
---|---|---|---|---|---|---|---|---|
Glucose COD = 200 | 296.88 ± 26.45 | 741 ± 34 | −500 ± 39 | 241 ± 28 | 0.20 ± 0.02 | 0.49 ± 0.04 | 90.45 ± 4.14 | 1.30 ± 0.23 |
Glucose COD = 400 | 706.05 ± 38.62 | 698 ± 57 | −511 ± 47 | 187 ± 24 | 0.17 ± 0.02 | 0.45 ± 0.03 | 90.99 ± 3.52 | 0.50 ± 0.04 |
Glucose COD = 800 | 1378.17 ± 121.23 | 627 ± 48 | −526 ± 61 | 101 ± 13 | 0.13 ± 0.01 | 0.40 ± 0.03 | 90.76 ± 3.34 | 0.23 ± 0.03 |
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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. https://doi.org/10.3390/w9030185
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(3):185. https://doi.org/10.3390/w9030185
Chicago/Turabian StyleSong, Hailiang, Shuai Zhang, Xizi Long, Xiaoli Yang, Hua Li, and Wenli Xiang. 2017. "Optimization of Bioelectricity Generation in Constructed Wetland-Coupled Microbial Fuel Cell Systems" Water 9, no. 3: 185. https://doi.org/10.3390/w9030185