scholarly journals Prompt nitrogen removal by controlling the oxygen concentration in sediment microbial fuel cell systems: the electrons allocation and its microbial mechanism

2020 ◽  
Vol 81 (6) ◽  
pp. 1209-1220
Author(s):  
Weiping Sima ◽  
Ruixiang Ma ◽  
Feixian Yin ◽  
Haodong Zou ◽  
Hong Li ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Cell System ◽  
Sediment Microbial Fuel Cell ◽  
Organic Sediment ◽  
Key Factor ◽  
Do Concentration ◽  
Total Nitrogen Removal

Abstract It has been proved that the nitrogen can be removed from the sediment in a sediment microbial fuel cell system (SMFCs), but the competition between nitrate and oxygen for electrons would be a key factor that would affect the removal efficiency, and its mechanism is not clear. Based on organic sediment fuel, an SMFC was constructed, and the influence of dissolved oxygen (DO) on nitrogen transformation and cathodic microbial communities was investigated. The results showed that the best total nitrogen removal efficiency of 60.55% was achieved at DO level of 3 mg/L. High DO concentration affected the removal efficiency through the electrons' competition with nitrate, while low DO concentration suppressed the nitrification. Comamonas, Diaphorobacter and Brevundimonas were the three dominant genera responsible for denitrification at DO concentration of 3 mg/L in this study. The establishment of SMFCs for nitrogen removal by regulating DO level would offer a promising method for sediment treatment.

ANAMMOX-denitrification biomass in microbial fuel cell to enhance the electricity generation and nitrogen removal efficiency

2020 ◽  
Vol 31 (4-6) ◽  
pp. 249-264 ◽  
Author(s):  
Ivar Zekker ◽  
Gourav Dhar Bhowmick ◽  
Hans Priks ◽  
Dibyojyoty Nath ◽  
Ergo Rikmann ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Electricity Generation

Deployment of the microbial fuel cell latrine in Ghana for decentralized sanitation

2014 ◽  
Vol 4 (4) ◽  
pp. 663-671 ◽  
Author(s):  
Cynthia J. Castro ◽  
Joseph E. Goodwill ◽  
Brad Rogers ◽  
Mark Henderson ◽  
Caitlyn S. Butler
Keyword(s):  
Organic Matter ◽  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Nitrogen Removal ◽  
Liquid Stream ◽  
Nitrogen Gas ◽  
Human Waste ◽  
Multiple User ◽  
Total Nitrogen Removal ◽  
Anode Respiring Bacteria

A microbial fuel cell (MFC) latrine that treats human waste and produces compost and electricity was deployed in Agona Nyakrom, Ghana. After solid wastes were composted, the MFC treated organic matter and nitrogen from the remaining liquid stream. Organic matter was oxidized in the anode by anode-respiring bacteria that transfer electrons to an external circuit, producing electricity, which was observed to be 268 nW/m2 after two years of operation. A separate nitrification stage transformed ammonium present in urine, to nitrate. Nitrate was reduced to nitrogen gas by cathode-oxidizing bacteria in the cathode completing nitrogen removal. The MFC Latrine was constructed on-site using local labor and materials. Evidence of total nitrogen removal and power production was observed while the MFC Latrine was in operation. Multiple user challenges and maintenance affected the performance, yielding low power output. The initial findings suggest that the viability of the system is directly correlated with its use. Incorporating the MFC Latrine system into the user community's typical social practices is key to a successful deployment of the MFC Latrine as a sanitation technology.

Membrane filtration biocathode microbial fuel cell for nitrogen removal and electricity generation

2014 ◽  
Vol 60 ◽  
pp. 56-63 ◽  
Author(s):  
Guangyi Zhang ◽  
Hanmin Zhang ◽  
Yanjie Ma ◽  
Guangen Yuan ◽  
Fenglin Yang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Nitrogen Removal ◽  
Electricity Generation ◽  
Membrane Filtration
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