Dry fermentation is a potential trend in biogas industry

but the slow start-up and uneven mass transfer in the fermentation system block its application. In this study

wet fermentation was adopted as the start-up phase of dry fermentation to promote two-stage anaerobic fermentation. The effect of the fermentation time of the first wet fermentation stage (3 d

5 d

10 d

15 d and 25 d) on the two-stage anaerobic fermentation was investigated. Lignocellulose degradation and SCOD (soluble chemical oxygen demand) changes in the first-stage wet fermentation were tested and the kinetics analysis for the two-stage fermentation process was fitted. The total methane yield of the whole fermentation with the wet fermentation period of 3

5

10

15 and 25d were 208.17

185.83

218.63

219.44 and 218.85 ml·(g VS)-1

respectively

which indicated that the period of wet fermentation stage above 10 d was necessary to guarantee biogas production of the dry fermentation process. Kinetics fitting analysis showed that the RC model was more suitable for the experimental study on anaerobic fermentation process

compared with the GM and LM models.