The research on effect of different solid content of typical manure on anaerobic digestion process

Recently, the demand of large and medium Biogas Plants in China is increasing. In order to increase volumetric gas production rate, High gravimetric solid fermentation is becoming a hot focus for research, the difficulty is how to increase the solid content of fermenter substrates, at the same time, the amount of gas is not decreased. In this paper, we select pig manure, cow manure and chicken manure, and do experiment with the temperature at 35°C, the initial pH at 7, and 4 solid contents. We can determine every process figure and capacity in order to determine the optimal solid content. The results show that as the solid content increases, the conversion rate of TS, VS, TCOD, and SCOD decreases. Through comparative analysis, the optimal solid content of chicken manure ranges 6% to 8%, and the cow manure and pig manure are about 10%.