In order to compare the effects of different pretreatment methods on gas production performance of artemisia selengensis straw

the straw was pretreated with acid or alkali of different concentrations before anaerobic digestion. Alkali pretreatment could effectively improve the performance of biogas production comparing with the control group

and the 2% NaOH pretreatment was the best. VFA concentration could be up to 4882.34 mg·L-1 at the early stage of anaerobic fermentation in the alkali pretreatment system

which was 705.21% higher than the control group. The gas yield of unit total solid (TS) was 288.42 ml·g-1 in the alkali pretreatment system

which was 17.08% higher than control group

and methane content reached 61.14%.