Effect of low intensity air-stirring on solid acidogenic digestion with pig manure and straw as feedstock
低强度空气搅拌对猪粪秸秆固体产酸发酵效果影响

In this study, an experiment was carried out to investigate the effect of air-stirring on solid acidogenic fermentation with pig manure and straw as feedstock under the condition of biogas slurry returning. The result shows that acetic acid which is dominant in fermentation products accounts for 86.4% and 84.3% of total VFAs in air-stirring and control experiments. Propionic acid which is destructive to methanogenic accounts for 7% and 4%, and succinic acid fraction is 11.6% and 6.6% in air-stirring and control experiments. The removal efficiency of volatile solid (VS) is higher than the control experiment though the total VFAs is lower under air-stirring condition. And the conclusion is that air-stirring can improve the anaerobic condition and accelerate fermentation process effectively, and air-stirring provides a new type of stirring for solid fermentation but an advanced research is needed.