Enhancement of biohydrogen production rate in Rhodospirillum rubrum by a dynamic CO-feeding strategy using dark fermentation

Table 2 Final broth and outlet gas composition in batch fermentations under several initial p_CO conditions

p_CO (atm)	Acetate	CO	Total biomass		PHB		Gases produced
p_CO (atm)	Conversion (%)	Total uptake (mol)	µ (h⁻¹)	C_X (g l⁻¹)	Cell content (% w w⁻¹)	Titre (g l⁻¹)	H₂ (mol)	CO₂ (mol)
0.10	21.1 ± 5.2	1.05 ± 0.12	0.049 ± 0.002	0.36 ± 0.04	10.8 ± 2.1	0.04 ± 0.01	1.05 ± 0.05	0.99 ± 0.09
0.20	37.4 ± 4.3	1.89 ± 0.24	0.058 ± 0.006	0.86 ± 0.09	14.8 ± 0.8	0.13 ± 0.01	1.81 ± 0.16	1.11 ± 0.11
0.40	100 ± 11.1	2.71 ± 0.26	0.058 ± 0.004	1.32 ± 0.11	26.5 ± 4.2	0.31 ± 0.01	2.48 ± 0.27	1.57 ± 0.17
0.50	100 ± 5.2	2.61 ± 0.67	0.057 ± 0.005	1.46 ± 0.16	30.4 ± 2.4	0.35 ± 0.03	2.59 ± 0.13	1.67 ± 0.07
0.60	100 ± 2.2	4.57 ± 0.41	0.063 ± 0.008	1.74 ± 0.21	24.1 ± 3.6	0.38 ± 0.06	4.55 ± 0.36	2.76 ± 0.22
0.75	100 ± 2.7	4.06 ± 0.71	0.061 ± 0.007	1.63 ± 0.24	24.8 ± 2.3	0.35 ± 0.04	3.96 ± 0.41	2.50 ± 0.25
1.00	100 ± 14.2	4.94 ± 2.41	0.040 ± 0.005	2.06 ± 0.54	17.4 ± 3.3	0.32 ± 0.09	4.88 ± 0.54	3.22 ± 0.35

ISSN: 2731-3654