Journal
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
Volume 98, Issue 23, Pages 9879-9887Publisher
SPRINGER
DOI: 10.1007/s00253-014-6136-2
Keywords
Microbial fuel cell (MFC); Magnetic field (MF); Phosphorus; Nitrogen; Electricity production; Wastewater treatment
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Funding
- National Natural Science Foundation [21277052]
- Department of Guangdong Education and the Science and Technology Bureau
- State Key Laboratory of Subtropical Building Science [2013ZC03, 2014ZB04]
- Environmental Protection Bureau [201203]
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The effect of a magnetic field (MF) on electricity production and wastewater treatment in two-chamber microbial fuel cells (MFCs) has been investigated. Electricity production capacity could be improved by the application of a low-intensity static MF. When a MF of 50 mT was applied to MFCs, the maximum voltage, total phosphorus (TP) removal efficiency, and chemical oxygen demand (COD) removal efficiency increased from 523 +/- 2 to 553 +/- 2 mV, similar to 93 to similar to 96 %, and similar to 80 to > 90 %, respectively, while the start-up time and coulombic efficiency decreased from 16 to 10 days and similar to 50 to similar to 43 %, respectively. The MF effects were immediate, reversible, and not long lasting, and negative effects on electricity generation and COD removal seemed to occur after the MF was removed. The start-up and voltage output were less affected by the MF direction. Nitrogen compounds in magnetic MFCs were nitrified more thoroughly; furthermore, a higher proportion of electrochemically inactive microorganisms were found in magnetic systems. TP was effectively removed by the co-effects of microbe absorption and chemical precipitation. Chemical precipitates were analyzed by a scanning electron microscope capable of energy-dispersive spectroscopy (SEM-EDS) to be a mixture of phosphate, carbonate, and hydroxyl compounds.
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