OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. a b s t r a c tTwo-dimensional carbon cloth and three-dimensional carbon felt were compared for their capacity to form bioanodes for food waste treatment. Wastewater was used as the dilution medium instead of a synthetic solution to be close to industrial conditions. In both cases, microbial cells were mainly wrapped around the fibers of the electrodes. The biofilms were around 80-120 μm thick with a 39.3% microbial volume ratio on carbon cloths. On carbon felt, the biofilms showed a lower microbial volume ratio of 16.3% on the upper layers but with a penetration depth of 200-800 μm. The biofilm patterns were different but they resulted in similar current density, around 3.5 A/m 2 .When chemically rich media have to be implemented, 2D cloth offers a worthwhile solution that can equal 3D porous materials.

OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Reducing the time required for the formation of microbial anodes from environmental inocula is a great challenge. The possibility of reaching this objective by increasing the temperature during the bioanode preparation was investigated here. Microbial anodes were formed at 25 C and 40 C under controlled potential with successive acetate additions. At 25 C, around 40 days were required to perform three acetate batches, which led to current density of 9.4 ± 2 A.m À2 , while at 40 C, 20 days were sufficient to complete three similar batches, leading to 22.9 ± 4.2 A.m À2 . The bioanodes formed at 40 C revealed three redox systems and those formed at 25 C only one. The temperature also impacted the biofilm structure, which was less compact at 40 C. When the bioanodes formed at 40 C were switched to 25 C, they produced current densities similar to those of bioanodes formed at 25 C; they recovered the single redox system that was developed by the bioanodes formed at 25 C and the difference in biofilm structures was mitigated. It is consequently fully appropriate to accelerate the formation of microbial anodes by increasing the temperatures to 40 C even if they are finally intended to operate at room temperature.