Biohydrogen-producing from bottom to top? Quali-quantitative characterization of thermophilic fermentative consortia reveals microbial roles in an upflow fixed-film reactor

Understanding specificities of biohydrogen (bioH2)-producing systems is a key factor to enable efficient energetic exploitation of organic substrates in dark fermentation systems. The use of fixed-film reactors has been pointed as a determining approach to enhance bioH2 evolution due to maintaining high cell densities within reactors. However, limiting substrate availability by excess cell accumulation has been associated with low hydrogenogenic...