Kinetics-based development of two-stage continuous fermentation of 1,3-propanediol from crude glycerol by Clostridium butyricum

Table 2 The experimental results in the second stage continuous fermentations

First stage		The second stage continuous fermentation
S_f	\(D_{1}\)	\(D^{\prime}_{2}\)	\(C_{{2\;{\text{S}}}}\)	Biomass	1,3-PDO	Butyrate	Acetate	Lactate	\(Q_{{2_{{{\text{Biomass}}}} }}\)	\(Q_{{2_{{{\text{PDO}}}} }}\)
(g/L)	(h⁻¹)	(h⁻¹)	(g/L)						(g/(L·h))
90	0.222	0.174	16.72 ± 0.95	5.21 ± 0.14	65.16 ± 0.54	13.08 ± 0.19	5.38 ± 0.10	3.08 ± 0.25	0.25	4.57
	0.256	0.199	23.62 ± 1.75	5.13 ± 0.19	61.54 ± 0.97	11.80 ± 0.37	5.36 ± 0.24	2.74 ± 0.28	0.30	5.25
	0.279	0.216	16.98 ± 1.43	5.37 ± 0.17	60.28 ± 0.84	11.34 ± 0.18	6.04 ± 0.21	2.64 ± 0.22	0.42	5.67
	0.321	0.246	18.32 ± 1.77	5.16 ± 0.21	57.79 ± 1.22	9.76 ± 0.27	6.52 ± 0.14	2.11 ± 0.08	0.44	6.37
110	0.148	0.119	13.40 ± 1.76	4.85 ± 0.24	69.31 ± 0.83	16.04 ± 0.23	6.15 ± 0.23	4.83 ± 1.02	0.12	2.83
	0.167	0.133	10.41 ± 3.06	6.24 ± 0.28	68.95 ± 1.57	15.09 ± 1.85	4.71 ± 0.39	2.53 ± 0.37	0.25	3.36
	0.173	0.135	20.59 ± 1.47	4.82 ± 2.56	67.17 ± 0.57	13.99 ± 0.36	7.26 ± 0.24	2.28 ± 0.15	0.19	3.38
	0.200	0.152	15.01 ± 1.03	4.60 ± 0.15	64.36 ± 0.90	12.34 ± 0.46	7.04 ± 0.19	1.57 ± 0.14	0.22	3.93
130	0.143	0.110	14.48 ± 0.37	4.60 ± 0.10	75.13 ± 0.73	18.36 ± 0.75	4.76 ± 0.58	2.98 ± 0.47	0.07	2.77

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