Effects of Mesophilic and Thermophilic Temperature on Hydrolysis and Acidification of Organic Wastes Two-Phase Anaerobic Digestion

Abstract

This paper investigated the effects of mesophilic temperature (35°C) and thermophilic temperature (55°C) on the hydrolysis and acidification phase in the process of organic wastes anaerobic digestion. Here, the organic wastes refer to the mixture of corn straw and pig manure in this paper. The results show that pH value is negatively correlated with volatile fatty acids (VFAs) concentration, throughout the process both the VFAs concentration and its maximum of mesophilic temperature are bigger than that of thermophilic temperature, but it takes longer time to reach the maximum; the total solids (TS) removal rate of thermophilic temperature is 31.85% and the mesophilic temperature is 27.33%, but it needs to consume more energy to maintain a high temperature state. The above results suggest that the mesophilic is more advantageous than thermophilic temperature in the treatment of corn straw and pig manure co-digestion, but the post-disinfection treatment is needed.