Abstract: Effect of addition of vermicompost on anaerobic digestion of corn stalk in biogas production was investigated with total solid (TS) concentration 50 g·kg^-1 and fermentation temperature 35 ℃. It was found that when corn stalk was in the digestor alone, the cumulative biogas yield per gram TS was 333.3 mL·g^-1 and the cumulative methane yield per gram TS was 202.0 mL·g^-1, but when vermicompost was added (1 : 1 in TS mass ratio), their outputs were increased by 20.0% and 35.5%,reaching 400.0 and 269.6 mL·g^-1, respectively. Moreover,the phenomenon of acidification disappeared during the process of fermentation.All these demonstrate that vermicompost is a suitable amendment in anaerobic digestion of corn stalk for biogas production.

Key words: corn stalk, vermicompost, additive, anaerobic digestion