Table 2.

Concentrations of biogas slurry used in this study

Concentration of biogas slurry (%)	Biogas slurry (mL)	Fresh water (mL)	NaOH (g)
0	0	50	0.67
10	5	45	0.67
20	10	40	0.67
30	15	35	0.67
40	20	30	0.67
50	25	25	0.67
60	30	20	0.67
70	35	15	0.67
80	40	10	0.67
90	45	5	0.67
100	50	0	0.67