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Table 1 Operation conditions of the two-stage and single-stage fermentation process

From: Changes in the microbial consortium during dark hydrogen fermentation in a bioelectrochemical system increases methane production during a two-stage process

Reactor type OLR HRT pHin, pHout
mg-C/L/day day
Two-stage
 BES → MF 1103.8 → 793.3 4 → 4 6.5, 6.2 → 6.2, 7.9
 BES → MF 2207.6 → 1656.0 2 → 4 6.5, 6.2 → 6.2, 7.7
 BES → MF 2207.6 → 1616.3 2 → 4 7.3, 6.1 → 6.1, 7.7
 NBES → MF 1103.8 → 707.7 4 → 4 6.5, 6.5 → 6.5, 7.8
 NBES → MF 2207.6 → 1507.7 2 → 4 6.5, 5.9 → 5.9, 7.8
 NBES → MF 2207.6 → 1533.5 2 → 4 7.3, 5.7 → 5.7, 7.7
Single-stage
 MF 1103.8 4 7.7, 7.2
  1. Two-stage process: (bioelectrochemical system (BES) → methane fermenter (MF) containing carbon fibre textiles (CFTs) or non-bioelectrochemical system (NBES) → MF containing CFTs)
  2. Single-stage fermentation process: (MF containing CFTs)