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

• Published in: BioMed research international Vol. 2015; no. 2015; pp. 1 - 10
• Main Authors: Palma, Luca Di, Geri, Alberto, Mancini, Daniele, Petroni, Gianluca, Di Domenico, Enea Gino, Ascenzioni, Fiorentina
• Format: Journal Article
• Language: English
• Published: Cairo, Egypt Hindawi Publishing Corporation 01.01.2015; John Wiley & Sons, Inc
• Subjects: Alternative energy sources; Ammonia; Ammonium Compounds - metabolism; Anaerobiosis - physiology; Anodes; Anodic; Bacteria; Bacteria, Nitrifying; Biochemical fuel cells; Biodegradation, Environmental; Bioelectric Energy Sources - microbiology; Biofilms - growth & development; Biogas; Chemical oxygen demand; Cytochrome; Electricity; Electricity generation; Electrodes; Fuel cells; Geobacter - growth & development; Geobacter - metabolism; Geobacter sulfurreducens; Graphite; Graphite - metabolism; Microbial mats; Microorganisms; Nitrogen - metabolism; Nitrogen removal; Production processes; Reactors; Studies; Technology application
• ISSN: 2314-6133; 2314-6141
• DOI: 10.1155/2015/351014

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 with Geobacter sulfurreducens and 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.