Application of electro-active biofilms
Résumé
The concept of an electro-active biofilm (EAB) has recently emerged from a few studies that discovered that certain bacteria which form biofilms on conductive materials can achieve a direct electrochemical connection with the electrode surface using it as electron exchanger, without the aid of mediators. This electro-catalytic property of biofilms has been clearly related to the presence of some specific strains that are able to exchange electrons with solid substrata (eg Geobacter sulfurreducens and Rhodoferax ferrireducens). EABs can be obtained principally from natural sites such as soils or seawater and freshwater sediments or from samples collected from a wide range of different microbially rich environments (sewage sludge, activated sludge, or industrial and domestic effluents). The capability of some microorganisms to connect their metabolisms directly in an external electrical power supply is very exciting and extensive research is in progress on exploring the possibilities of EABs applications. Indeed, the best known application is probably the microbial fuel cell technology that is capable of turning biomass into electrical energy. Nevertheless, EABs coated onto electrodes have recently become popular in other fields like bioremediation, biosynthesis processes, biosensor design, and biohydrogen production.
Mots clés
Bioelectric Energy Sources
Biofilms
Biofilms: growth & development
Burkholderia
Burkholderia: growth & development
Burkholderia: physiology
Electrochemistry
Electrodes
Electron Transport
Geobacter
Geobacter: growth & development
Geobacter: physiology
Sewage
Sewage: microbiology
Surface Properties
Water Purification
Water Purification: methods
bioelectrochemical sensor
electro-active biofilms (EABs)
biocathode
electricity generation
wastewater treatment