Table 1.

The biochemical data at the initial and terminal sampling points of three groups

Group	Sample point	OD600	OD600 descending rate (day−1)	Total acetate (mM)	Acetate consumption rate (mM/day)	CH4 production rate (mmol/day)	pH	pH rising rate (day−1)
10-group	10-I	1.122	0.018	9.66	0.73	0.049	6.47	0.046
	10-T	1.022	0.017	4.15	0.94	0.073	6.69	0.037
25-group	25-I	1.194	0.020	23.70	0.59	0.075	6.56	0.051
	25-T	1.048	0.018	9.92	1.57	0.034	6.93	0.036
50-group	50-I	1.168	0.015	44.59	0.74	0.095	6.69	0.040
	50-T	0.934	0.0079	24.93	1.78	0.092	7.22	0.030