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Nitrogen recovery from wastewater using microbial fuel cells |
Yong XIAO1,Yue ZHENG1,2,Song WU1,2,Zhao-Hui YANG2,Feng ZHAO1,*() |
1. Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China 2. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China |
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Abstract Nitrogen is one of major contaminants in wastewater; however, nitrogen, as bio-elements for crop growth, is the indispensable fertilizer in agriculture. In this study, two-chamber microbial fuel cells (MFCs) were first operated with microorganisms in anode chamber and potassium ferricyanide as catholyte. After being successfully startup, the two-chamber MFCs were re-constructed to three-chamber MFCs which were used to recover the NO3−−N and NH4+−N of synthetic wastewater into value-added nitrogenous fertilizer from cathode chamber and anode chamber, respectively. Ferric nitrate was used as the sole electron acceptor in cathode, which also was used to evaluate the NO3−−N recover efficiency in the case major anion of NO3− in cathode. The output voltage of these MFCs was about 600–700 mV at an external load of 500 Ω. About 47% NH4+−N in anode chamber and 83% NO3−−N in cathode chamber could be recovered. Higher current density can selectively improve the recovery efficiency of both NH4+−N and NO3−−N. The study demonstrated a nitrogen recovery process from synthetic wastewater using three-chamber MFCs.
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Keywords
nitrogen recovery
microbial fuel cells (MFCs)
electromigration
wastewater treatment
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Corresponding Author(s):
Feng ZHAO
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Online First Date: 11 June 2014
Issue Date: 03 December 2015
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