Effect of different inoculum concentrations on anaerobic fermentation char acteristics from rice straw

Using rice straw as raw material and the biogas slurry as inoculum,a batch fermentation test was operated at inoculum weight of 40 g,80 g and 120 g.Characteristics of biogas production were studied,and the results showed that: the appropriate amount of inoculum could improve the buffering capacity of the digestive system,was conducive to the gas production peak ahead,and simultaneously had a role in promoting the degradation of rice straw.The highest total gas production was reached at inoculum weight of 80 g and was 3 452 mL.TS biogas production reached 256.27 mL·g-1,93.71% and 15.14% higher than that of 40 g and 120 g,respectively.