Culture adaptation for enhanced biogas production from birch wood applying stable carbon isotope analysis to monitor changes in the microbial community

Table 3 Relative abundance of methane-producing archaea and the apparent fraction factors α_c

	Hydrogenotrophic methanogens	Acetoclastic methanogens	α_c	NH₄	VFA	pH
R₀
Day 0	85.9	14.1	1.054	1.9	0.4	7.52
Day 6	98.9	1.1	1.058	2.8	0.8	7.92
Day 35	56.8	43.2	1.04	1.05	0.5	7.47
Day 65	39.1	60.9	1.03	0.6	1.07	7.36
Day 95	36.4	63.6	1.025	0.6	1.01	7.38
Day 120	34.5	65.5	1.024	0.57	1.1	7.38
R₁
Day 0	85.8	14.2	1.05	1.7	0.2	7.51
Day 6	99.19	0.9	1.062	3	1.01	7.91
Day 35	49.6	50.4	1.04	1.1	0.5	7.45
Day 65	33.2	66.8	1.035	0.6	1.7	7.35
Day 95	26.3	73.7	1.032	0.54	1.6	7.35
Day 120	26.6	73.4	1.027	0.48	2.7	6.97

Presented ammonium, VFA and pH are the average value of three parallel measurements from the same samples

ISSN: 2731-3654