The kinetic constants such as growth rate and decay rate of microorganism were adjusted the estimated values from initial values which using temperature correlations given by Buhr and Andrews (1977) for temperatures of 35oC. The Buhr and Andrews (1977) temperature expressions were implemented in GPS-X. The temperature correlations were applied to the rates of hydrolysis and all of the anaerobic biomass growth and decay processes. It can be shown closely match between the simulations data and the experimental data, were provided in Table 3.4-3.5.