Anaerobic Ruminococcaceae were predominant in the bottom section of the high-current PMFC
Ruminococcaceae accounted for over half of the bacterial rhizosphere sequences in the bottom section of the high- current PMFC. The members of this family have not been reported to be electrochemically active, but they are known to hydrolyse cellulose into hydrogen and low molecular weight organic compounds. In MFCs, the hydrolysis of cellulose generates electron donors that are suitable for G. sulfurreducens (Maki et al. 2009;Renetal. 2007).