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Table 1 The estimated kinetic constants based on the modified Gompertz equation for hydrogen production with C. pasteurianum CH4 through batch fermentation using non-VMD-integrated and VMD-integrated processes with and without butyrate addition

From: Bio-butanol production from glycerol with Clostridium pasteurianum CH4: the effects of butyrate addition and in situ butanol removal via membrane distillation

  λ (h) H max (L L−1) R max (L L−1 h−1) R 2 Hydrogen yield (mol H2/mol glycerol)
Non-VMD-integrated fermentation
 Without butyrate addition 25.0 8.53 0.30 0.985 0.45 ± 0.03
 With butyrate addition 23.0 5.18 0.25 0.993 0.41 ± 0.04
VMD-integrated fermentation
 Without butyrate addition 55.0 19.55 0.39 0.999 0.78 ± 0.11
 With butyrate addition 28.5 18.74 0.31 0.996 0.75 ± 0.06
  1. λ lag time of H2 production (the time required for the onset of H2 production), H max maximum H2 production estimated from the modified Gompertz equation, R max maximum H2 production rate estimated from the modified Gompertz equation