Fig. 3From: Changes in the microbial consortium during dark hydrogen fermentation in a bioelectrochemical system increases methane production during a two-stage processReactor performances of two-stage processes of the bioelectrochemical system (BES) → methane fermenter (MF) and non-bioelectrochemical system (NBES) → MF. a Rate of gas production of hydrogen, methane, and carbon dioxide, b productions of soluble metabolic products. c Carbon balance of the system. The organic loading rate (OLR) of the BES and NBES was 2207.6 mg-C/L/day, corresponding to a glucose load of 27.8 mMglucose/L/day. The hydraulic retention time (HRT) of the BES and NBES was 2 days and the HRT of the second-stage MFs was 4 daysBack to article page