The study of influencing factors to straw mixed with livestock manure anaerobic fermentation

Anaerobic fermentation of mixed raw materials is an effective method to solve the single raw material fermentation instability and adjust the carbon to nitrogen ratio during the fermentation process. In this study, manure and straw were used as mixed fermentation raw materials. The effects of mixed raw material types, total solid concentration, inoculum types and inoculation ratio on gas production efficiency were studied. The experimental results show that the total TS has the greatest effect on the biogas gas production effect. The pig manure and rice stalks are used as the mixed raw materials. The total TS is set to 10%. The inoculum is selected from the biogas slurry. The inoculation ratio is 30%. The gas rate is 0.61 L/(L . d). The influence of four factors on gas production performance is: total solid concentration> fermentation raw material> types of inoculum> inoculation ratio. The test results have certain reference significance for anaerobic digestion of mixed raw materials.