scholarly journals Development of Electroactive and Anaerobic Ammonium-Oxidizing (Anammox) Biofilms from Digestate in Microbial Fuel Cells

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Enea Gino Di Domenico ◽  
Gianluca Petroni ◽  
Daniele Mancini ◽  
Alberto Geri ◽  
Luca Di Palma ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Nitrogen Removal ◽  
Microbial Fuel Cells ◽  
Energy Recovery ◽  
Electricity Generation ◽  
Geobacter Sulfurreducens ◽  
Graphite Anode ◽  
Anammox Bacteria ◽  
Ammonium Oxidation ◽  
Anodic Chamber

Microbial Fuel cells (MFCs) have been proposed for nutrient removal and energy recovery from different wastes. In this study the anaerobic digestate was used to feed H-type MFC reactors, one with a graphite anode preconditioned withGeobacter sulfurreducensand the other with an unconditioned graphite anode. The data demonstrate that the digestate acts as a carbon source, and even in the absence of anode preconditioning, electroactive bacteria colonise the anodic chamber, producing a maximum power density of 172.2 mW/m2. The carbon content was also reduced by up to 60%, while anaerobic ammonium oxidation (anammox) bacteria, which were found in the anodic compartment of the reactors, contributed to nitrogen removal from the digestate. Overall, these results demonstrate that MFCs can be used to recover anammox bacteria from natural sources, and it may represent a promising bioremediation unit in anaerobic digestor plants for the simultaneous nitrogen removal and electricity generation using digestate as substrate.

scholarly journals Suspended anode-type microbial fuel cells for enhanced electricity generation

RSC Advances ◽  
2020 ◽  
Vol 10 (17) ◽  
pp. 9868-9877
Author(s):  
Yiyang Liu ◽  
Xiaoyan Sun ◽  
Di Yin ◽  
Lankun Cai ◽  
Lehua Zhang
Keyword(s):  
Fuel Cells ◽  
Microbial Fuel Cells ◽  
Electricity Generation ◽  
Anode Carbon ◽  
Anodic Chamber ◽  
Intermittent Contact ◽  
Carbon Based

Suspended anode (carbon-based granules) with intermittent contact by stirring it in an anodic chamber of an MFC to enhance the performance.

scholarly journals Effect of Cathode Material and Its Size on the Abundance of Nitrogen Removal Functional Genes in Microcosms of Integrated Bioelectrochemical-Wetland Systems

Soil Systems ◽  
2020 ◽  
Vol 4 (3) ◽  
pp. 47
Author(s):  
Sharvari S. Gadegaonkar ◽  
Timothé Philippon ◽  
Joanna M. Rogińska ◽  
Ülo Mander ◽  
Martin Maddison ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Nitrogen Removal ◽  
Microbial Fuel Cells ◽  
Quantitative Polymerase Chain Reaction ◽  
Anammox Bacteria ◽  
N2o Emissions ◽  
Wastewater Management ◽  
Ammonium Oxidation ◽  
Graphite Felt ◽  
Microbial Groups

Constructed wetland-microbial electrochemical snorkel (CW-MES) systems, which are short-circuited microbial fuel cells (MFC), have emerged as a novel tool for wastewater management, although the system mechanisms are insufficiently studied in process-based or environmental contexts. Based on quantitative polymerase chain reaction assays, we assessed the prevalence of different nitrogen removal processes for treating nitrate-rich waters with varying cathode materials (stainless steel, graphite felt, and copper) and sizes in the CW-MES systems and correlated them to the changes of N2O emissions. The nitrate and nitrite removal efficiencies were in range of 40% to 75% and over 98%, respectively. In response to the electrochemical manipulation, the abundances of most of the nitrogen-transforming microbial groups decreased in general. Graphite felt cathodes supported nitrifiers, but nirK-type denitrifiers were inhibited. Anaerobic ammonium oxidation (ANAMMOX) bacteria were less abundant in the electrochemically manipulated treatments compared to the controls. ANAMMOX and denitrification are the main nitrogen reducers in CW-MES systems. The treatments with 1:1 graphite felt, copper, plastic, and stainless-steel cathodes showed higher N2O emissions. nirS- and nosZI-type denitrifiers are mainly responsible for producing and reducing N2O emissions, respectively. Hence, electrochemical manipulation supported dissimilatory nitrate reduction to ammonium (DNRA) microbes may play a crucial role in producing N2O in CW-MES systems.

Electricity generation in microbial fuel cells: Using humic acids as a mediator

2008 ◽  
Vol 136 ◽  
pp. S474-S475
Author(s):  
Yifeng Zhang ◽  
Liping Huang ◽  
Jingwen Chen ◽  
Xianliang Qiao ◽  
Xiyun Cai
Keyword(s):  
Fuel Cells ◽  
Humic Acids ◽  
Microbial Fuel Cells ◽  
Electricity Generation
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