High-Performance Bioanode Development for Fermentable Substrates via Controlled Electroactive Biofilm Growth

作者：Ichihashi Osamu^*; Vishnivetskaya Tatiana A; Borole Abhijeet P

来源：ChemElectroChem, 2014, 1(11): 1940-1947.

DOI：10.1002/celc.201402206

• biofilms
• continuous flow
• direct electron transfer
• exoelectrogenic catalysts
• microbial fuel cells

A bioanode was optimized to generate current densities reaching 38.4 +/- 4.9Am(-2), which brings bioelectrochemical systems closer to commercial consideration. Glucose and lactate were fed together in a continuous or fed-batch mode. The current density increased from 2.3Am(-2) to 38.4Am(-2) over a 33day period and remained stable thereafter. The Coulombic efficiency ranged from 50% to 80%. A change in substrate concentration from 200mgL(-1) to 5mgL(-1) decreased maximum current density from 38.4Am(-2) to 12.3Am(-2). The anode consortia included Firmicutes (55.0%), Proteobacteria (41.8%) and Bacteroidetes (2.1%) constituting two potentially electrogenic genera: Geobacter (6.8%) and Aeromonas (31.9%). The current production was found to be limited by kinetics during the growth period (33days), and mass transfer, thereafter. The results indicate the necessity of removing spent biomass for efficient long-term operation and treatment of wastewater streams.

• 出版日期2014-11-11