The performances of biohydrogen production in previous investigations were reviewed, and
shown in Table 1 for a batch process and Table 2 for a continuous
process. Dark fermentative hydrogen production has received
increasing attention in recent years, due to its high hydrogen production rate (HPR) [15]. The proposed three-phase fluidized bed
bioreactors showed promising H2 producing performance and may
have a potential to apply in practical biohydrogen production
processes [41]