Biotechnology for Biofuels and Bioproducts

Table 3 Kinetic and statistical parameters of the proposed model

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

p_CO (atm)	Kinetic parameter
	K_{X, A} × 10³	\(K_{{{\text{X}},{\text{ CO}}_{2} }}\)	K₁	K₂ × 10³	K_P × 10³	Ʋ_A/P	Ʋ_A/X	Ʋ\(_{{{\text{CO}}_{2} /{\text{X}}}}\)
	(g X g A⁻¹ h⁻¹)	(g X mol CO₂⁻¹ h⁻¹)	(mol H₂ g X⁻¹ h⁻¹)	(mol CO g X⁻¹)	(g PHB g X⁻¹ h⁻¹)	(g A g PHB⁻¹)	(g A g X⁻¹)	(g CO₂ g X⁻¹)
0.10	2.01 ± 0.51	–	0.13 ± 0.04	0.65 ± 0.21	1.16 ± 0.39	0.25 ± 0.04	0.76 ± 0.03	–
0.20	–	5.31 ± 0.51	0.26 ± 0.03	1.39 ± 0.16	2.18 ± 0.74	2.67 ± 0.88	0.12 ± 0.04	1.04 ± 0.17
0.40	–	5.76 ± 0.76	0.18 ± 0.02	1.31 ± 0.64	3.95 ± 0.74	2.66 ± 0.98	0.09 ± 0.03	0.82 ± 0.11
0.50	–	4.08 ± 0.54	0.34 ± 0.04	2.25 ± 0.29	7.79 ± 2.29	1.55 ± 0.45	0.04 ± 0.02	1.31 ± 0.11
0.60	–	5.18 ± 0.51	0.21 ± 0.01	1.51 ± 0.08	5.92 ± 0.95	2.64 ± 0.31	0.26 ± 0.03	0.87 ± 0.07
0.75	–	5.18 ± 0.54	0.18 ± 0.02	1.72 ± 0.16	6.03 ± 0.99	1,83 ± 0.32	0.52 ± 0.02	0.85 ± 0.14
1.00	–	7.74 ± 0.76	0.08 ± 0.01	1.27 ± 0.33	1.52 ± 0.11	2.69 ± 0.53	0.18 ± 0.04	0.65 ± 0.31

p_CO (atm)	Statistical parameter
p_CO (atm)	F_calc	F_tab	RMSE	SSR	VE (%)
0.10	1529	2.249	0.002	2 × 10^–4	91.7
0.20	4399	2.249	0.003	6 × 10^–4	96.6
0.40	9066	2.249	0.003	5 × 10^–4	98.1
0.50	6314	2.249	0.005	1 × 10^–3	97.2
0.60	14,002	2.346	0.003	4 × 10^–4	99.3
0.75	24,872	2.249	0.003	6 × 10^–4	99.1
1.00	4426	2249	0.012	7 × 10^–3	90.1

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