Establishment and Validation of Methanogenesis Prediction Model for Biogas Production with Manure Wastewater

Continuous anaerobic fermentation experiment was carried out with manure wastewater to produce biogas by using six parallel glass digesters system. Basic process conditions were chosen reference to previous studies. Fermentation process reached to steady state after approximately 45 days, henceforth, about 565.3mL methane produced every day. A prediction model was deduced based on the theory of methane fermentation, which can be used to forecast methane production according to a few of processing parameters. In the experiment, two pivotal parameters involved in model were calculated, the sludge yield coefficient (Y-H) is 2.829x10(-2) and the sludge digestion coefficient (K-d) is 0.0215. Validation experiments showed that average relative error between predicted values and measured values is 7.00%, and the result of T-test indicated the difference of both is not significant at the 95% confidence level (p=0.6974), which means the model can predict the production of methane precisely.