INFLUENCE OF TEMPERATURE ON THE CHARACTERISTICS OF ANAEROBIC DIGESTION AND CHANGES IN THE MICROBIAL COMPOSITION OF A CATTLE MANURE AND RICE STRAW MIXTURE

The effect of temperature on the characteristics of anaerobic digestion of a mixture of cattle manure and rice straw and the microbial communities present therein was studied at 15 degrees C, 25 degrees C, and 35 degrees C. The results showed that correlation of temperature with maximum biogas production rate and cumulative biogas production was not significant, while that between temperature and daily biogas production was. Change in daily biogas production was perfectly correlated with time and the modified Gompertz model. The modified Gompertz model could offer an accurate simulation of the biogas production process in the system. The composition of microbial communities changed at different temperatures. Mycetocola zhadangensis, Janibacter cremeus, and Sphingobacterium caeni were dominant at 15 degrees C, 25 degrees C, and 35 degrees C, respectively. Terrimonas lutea, Capnocytophaga sputigena, Bacteroides reticulotermitis, and Prevotella oryzae were dominant at all the different temperatures examined.